WO2016148248A1 - Roue réductrice à vis sans fin et dispositif de direction à énergie électrique - Google Patents

Roue réductrice à vis sans fin et dispositif de direction à énergie électrique Download PDF

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Publication number
WO2016148248A1
WO2016148248A1 PCT/JP2016/058546 JP2016058546W WO2016148248A1 WO 2016148248 A1 WO2016148248 A1 WO 2016148248A1 JP 2016058546 W JP2016058546 W JP 2016058546W WO 2016148248 A1 WO2016148248 A1 WO 2016148248A1
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WO
WIPO (PCT)
Prior art keywords
worm
bearing
bearing holder
housing
spring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/058546
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English (en)
Japanese (ja)
Inventor
尚史 川村
麻衣 山内
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JTEKT Corp
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JTEKT Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JTEKT Corp filed Critical JTEKT Corp
Priority to JP2017506617A priority Critical patent/JP6731164B2/ja
Publication of WO2016148248A1 publication Critical patent/WO2016148248A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • F16H55/24—Special devices for taking up backlash

Definitions

  • the present invention relates to a worm reducer and an electric power steering device.
  • a compression coil spring disposed radially outward from the end of the worm shaft biases the end of the worm shaft toward the worm wheel via a bearing that supports the end of the worm shaft. ing.
  • the worm shaft includes an extending portion that passes through the bearing and protrudes axially outward from the bearing, and the compression coil spring is a fluororesin-coated bush that fits into the extending portion. The extending portion is urged toward the worm wheel via the.
  • the urging member is disposed radially outward of the extended portion of the worm shaft. Therefore, compared with the worm reduction gear of patent document 1, the mounting property to a vehicle etc. becomes favorable. However, since the urging member urges the worm shaft without using a bearing, loss torque is generated and assist torque is reduced.
  • a bush is disposed on the outer periphery of the extending portion in order to reduce the loss torque. However, the loss torque is increased as compared with the worm speed reducer disclosed in Patent Document 1.
  • the invention of claim 1 includes a housing (17), a first end (18a) housed in the housing and connected to the electric motor (14), and a second end located opposite to the first end.
  • a worm shaft (18) having an end (18b), a worm wheel meshing with the worm shaft (19), a first bearing (33) for rotatably supporting the first end with respect to the housing;
  • a second bearing (34) that rotatably supports the second end portion, and a receiving seat (55; 55Q) disposed on an axially outer side (X2) of at least one of the second end portion and the second bearing.
  • the receiving seat may be disposed closer to the worm wheel than the central axis (C1) of the worm shaft.
  • a bearing holder (50; 50Q; 50V; 50W; 50X) for holding the second bearing may be provided, and the receiving seat forming member may be provided integrally with the bearing holder.
  • the housing or the member (80; 44X) held by the housing moves the biasing member in a biasing direction (Y2) and in a direction opposite to the biasing direction (Y1).
  • the guide part (64; 84; 64V; 44Xb) which guides the movement of a bearing holder may be included.
  • the housing includes a holding hole (61X) that holds the bearing holder and is open at one end, and the lid member (44X) fitted to the bearing holder and the one end of the holding hole. ) And a compression spring (70X) as the urging means interposed between the bearing holder and the lid member.
  • the guide part may be key-coupled to the guided part.
  • the cover member engages with the bearing holder in the state of the subassembly, and has an engaging projection (44Xc) that receives the biasing load of the compression spring via the bearing holder. May be included.
  • the subassembly may include a buffer member (240) interposed between the bearing holder and the housing.
  • the bearing holder (50W) includes a C-shaped fitting portion (51We) fitted to the outer periphery (43a) of the outer ring of the second bearing, and extends from the fitting portion. Including a pair of flanges (51Wg, 51Wh) that respectively contact the pair of end surfaces (43b) of the outer ring of the second bearing, and may be made of resin.
  • At least one of the second end portion and the second bearing is axially outward and is disposed between the receiving seat forming member (52V) and the housing (17V).
  • a member (140) may be provided.
  • the buffer member may include a rubber member, and the bearing holder may be in contact with the housing when the rubber member is compressed by a predetermined amount.
  • a bearing holder (50V; 50W) that fits on an outer periphery of the outer ring of the second bearing and holds the second bearing as in claim 15, wherein the housing is axially outer with respect to the bearing holder.
  • a step portion (153) adjacent to the side may be included.
  • the receiving seat forming member (52V; 52W) is a first restraining portion for restraining movement of one end of the biasing member in a direction intersecting with the biasing direction of the biasing member.
  • the buffer member may include a second restraining portion (141) for restraining movement of the other end of the biasing member in a direction crossing the biasing direction of the biasing member. Good.
  • a support portion (17b; 44b; 88) provided on the housing or a member (44T; 80U) held by the housing and supporting the spacer may be provided.
  • the urging member is adjacent to at least one of the second end portion of the worm shaft and the second bearing, and is formed between the housing and the receiving seat of the receiving seat forming member. Since it is disposed between them, it is possible to improve mountability to a vehicle or the like while suppressing loss torque.
  • size reduction is achieved by the layout which arrange
  • the receiving seat forming member is provided integrally with the bearing holder, the structure can be simplified.
  • the second end portion of the worm shaft can be smoothly guided by the guide portion in the urging direction of the urging member and in the direction opposite to the urging direction.
  • the bearing holder, the lid member, and the compression spring can be collectively assembled into the holding hole of the housing as a subassembly, the assemblability is improved.
  • the second end portion of the worm shaft can be smoothly guided in the biasing direction of the biasing member and in the direction opposite to the biasing direction by the guide portion of the lid member.
  • the function of guiding the second end portion of the worm shaft is achieved while the lid member and the bearing holder are unitized by key coupling between the guide portion of the lid member and the guided portion of the bearing holder. can do.
  • the biasing load of the compression spring is exerted on the lid member and the bearing holder, and unitization of the lid member, the bearing holder and the compression spring can be achieved.
  • the assemblability is further improved.
  • the bearing holder includes a C-shaped fitting portion that opens to the worm wheel side. For this reason, even if the worm shaft is reduced in size in the axial direction so that the second end of the worm shaft approaches the first end, the bearing holder does not interfere with the worm wheel. As much as possible, the worm speed reducer can be reduced in size with respect to the axial direction of the worm shaft.
  • the bearing holder holds the second bearing by the C-shaped fitting portion and the pair of flanges. For this reason, even if a temperature change or a dimensional change due to water absorption occurs in the bearing holder, it is possible to prevent the bearing holder from falling off the second bearing.
  • the following effects are obtained. That is, if the buffer member is disposed radially outward of the second bearing, the inner diameter of the accommodation hole that accommodates the worm shaft in the housing is increased. For this reason, there exists a possibility that a 1st bearing may enlarge, or a housing may enlarge. In contrast, this is not the case with the present invention.
  • the bearing holder it is possible to prevent the bearing holder from falling off the second bearing by the stepped portion of the housing.
  • the buckling and displacement of the biasing member can be suppressed by the first restraining portion and the second restraining portion.
  • the following effects are obtained. That is, the dimensional change due to the temperature change of the receiving seat forming member provided on the outer ring tends to increase as the position is radially outward.
  • the receiving seat forming member is arranged in the axially outer side of the second end portion of the worm shaft so as to be arranged at the radial center or near the center. For this reason, even if the dimension of a receiving seat formation member changes with temperature changes, the change of the position of a receiving seat is small. Therefore, the set length of the urging member hardly changes and the urging load is stabilized.
  • the set length of the biasing member can be easily adjusted by changing the specification of the spacer.
  • the spacer can be supported by the support portion provided in the housing or the like.
  • a small electric power steering device can be realized.
  • FIG. 3A is a sectional view taken along line III-III in FIG.
  • FIG. 3B is a partially enlarged view of the bearing holder and the bearing in FIG. 2.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 5.
  • FIG. 20 is a sectional view taken along line XX-XX in FIG.
  • 14th Embodiment it is a perspective view of the subassembly of a worm reduction gear. In 14th Embodiment, it is sectional drawing of the said subassembly. In 14th Embodiment, it is a disassembled perspective view of the bearing holder and buffer member of the said subassembly. In 14th Embodiment, it is a disassembled perspective view of the said subassembly. In 14th Embodiment, it is a disassembled perspective view from another angle of the said subassembly.
  • FIG. 1 is a schematic diagram showing a schematic configuration of an electric power steering apparatus including a worm reduction gear according to a first embodiment of the present invention.
  • the steering mechanism 4 includes a steering shaft 6 that rotates in conjunction with the rotation of the steering wheel 2.
  • the steering shaft 6 includes an input shaft 7a, an output shaft 7b, an intermediate shaft 9, and a pinion shaft 11.
  • the input shaft 7a is connected to the steering wheel 2 (steering member).
  • the output shaft 7b is connected to the input shaft 7a via a torsion bar 7c. Further, the output shaft 7 b is connected to the intermediate shaft 9 through the universal joint 8. The intermediate shaft 9 is connected to a pinion shaft 11 having a pinion 11 a through a universal joint 10.
  • the pinion shaft 11 rotates through the input shaft 7a, the output shaft 7b, and the intermediate shaft 9.
  • the rotation of the pinion shaft 11 is converted into a reciprocating motion in the axial direction of the rack shaft 12 by the steering mechanism A.
  • the turning angle of the steered wheels 3 is changed by the reciprocating motion of the rack shaft 12 in the axial direction.
  • the assist mechanism 5 includes a torque sensor 21, an ECU (Electronic Control Unit) 16, an electric motor 14, and a worm speed reducer 15.
  • FIG. 2 is a cross-sectional view of a main part of the worm reduction gear according to the first embodiment of the present invention.
  • the worm speed reducer 15 includes a housing 17, a worm shaft 18, a first bearing 33, a second bearing 34, a worm wheel 19, and an urging portion.
  • the worm shaft 18, the first bearing 33, the second bearing 34, the worm wheel 19 and the urging portion are accommodated in the housing 17.
  • the worm shaft 18 has a first end portion 18a and a second end portion 18b that are separated in the axial direction X, and a tooth portion 18c at an intermediate portion between the first end portion 18a and the second end portion 18b.
  • the worm shaft 18 is accommodated in the accommodating portion 17 a of the housing 17.
  • the worm shaft 18 is disposed coaxially with the output shaft 14 a of the electric motor 14.
  • the first end 18 a of the worm shaft 18 faces the end of the output shaft 14 a of the electric motor 14 in the axial direction X.
  • the first end portion 18a of the worm shaft 18 and the end portion of the output shaft 14a of the electric motor 14 are connected via a power transmission joint 20 so that torque can be transmitted.
  • the power transmission joint 20 includes a first rotating element 23, a second rotating element 24, and an intermediate element 25.
  • the first rotating element 23 is fixed to the first end 18a of the worm shaft 18 so as to be integrally rotatable.
  • the second rotating element 24 is fixed to the end of the output shaft 14a of the electric motor 14 so as to be integrally rotatable.
  • the first rotating element 23 has a plurality of engaging protrusions 29 protruding in the axial direction X toward the second rotating element 24.
  • the plurality of engaging protrusions 29 are arranged in the rotational direction Z (corresponding to the circumferential direction) with an interval in the rotational direction Z.
  • the second rotating element 24 has a plurality of engaging protrusions 30 that protrude in the axial direction X toward the first rotating element 23.
  • the plurality of engaging protrusions 30 are arranged in the rotational direction Z (corresponding to the circumferential direction) with an interval in the rotational direction Z.
  • the engagement protrusions 29 of the first rotation element 23 and the engagement protrusions 30 of the second rotation element 24 are alternately arranged with an interval in the rotation direction Z.
  • the tooth part 19b is fitted to the outer periphery of the cored bar part 19a and rotates integrally with the cored bar part 19a.
  • Teeth 19c that mesh with the teeth of the tooth portion 18c of the worm shaft 18 are formed on the outer peripheral surface of the tooth portion 19b.
  • FIG. 10 is a cross-sectional view of a main part of a worm reduction gear 15R according to the fourth embodiment of the present invention.
  • the worm reducer 15R of the fourth embodiment is mainly different from the worm reducer 15 of the first embodiment of FIG.
  • the structure can be simplified and the cost can be reduced.
  • Each torsion spring 91 includes a coil portion 92 and a pair of arms 93 and 94.
  • the coil unit 92 connects the pair of arms 93 and 94.
  • the pair of arms 93 and 94 are inclined in directions opposite to each other.
  • An end 93 a of one arm 93 is received by the second spring seat 65 of the housing 17.
  • the end 94 a of the other arm 94 is received by the first spring seat 55 of the spring seat forming portion 52.
  • the spring seats 55 and 65 are shown in a simplified manner.
  • the spring seats 55 and 65 may be formed by recesses.
  • FIG. 12 schematically shows the configuration of the urging portion of the sixth embodiment of the present invention.
  • a compression spring other than the compression coil spring is applied as the biasing member to the first embodiment.
  • the compression spring unit 100 including a pair of leaf springs 101 expands and contracts in a pantograph shape.
  • the compression spring unit 100 is interposed between the first spring seat 55 of the spring seat forming portion 52 and the second spring seat 65 of the housing 17 in a state shortened from the free state.
  • the compression spring unit 100 in the shortened state generates a pressing biasing force in the extension direction (second direction Y2) by the repulsive force of the bending portion 102 that is bent and deformed so that the bending angle becomes small, and the spring seat is generated by the pressing biasing force.
  • the forming portion 52 is pressed and biased in the second direction Y2.
  • FIG. 13 schematically shows the configuration of the urging portion of the seventh embodiment of the present invention.
  • 7th Embodiment has shown the example which applied compression springs other than a compression coil spring as an urging
  • a compression spring unit 110 as a compression spring includes a ring spring 111 wound around a plurality of strips.
  • the plurality of ring springs 111 are formed of a continuous member (for example, a metal wire).
  • Each ring spring 121 includes a first portion 122 and a second portion 123.
  • the first portion 122 is inserted through the first insertion hole 68 a of the spring seat forming portion 68 of the housing 17.
  • the second portion 123 is inserted through the second insertion hole 52Ta of the spring seat forming portion 52T.
  • Each part 122,123 may be fixed to the corresponding insertion hole 68a, 52Ta.
  • the spring seat forming portion 52T is provided integrally with the outer ring 43 (not shown in FIG. 14) of the second bearing 34.
  • the inner surfaces of the insertion holes 68a and 52Ta constitute spring seats (reception seats) for receiving the corresponding portions 122 and 123 of the ring springs 121, respectively.
  • the ring spring 121 is interposed between the spring seat forming portion 68 and the spring seat forming portion 52T in a state in which the first portion 122 and the second portion 123 are pulled and deformed away from the free state.
  • Each ring spring 121 pulls and biases the spring seat forming portion 52T in the second direction Y2 with an elastic restoring force against tensile deformation.
  • FIG. 15 is a cross-sectional view of a main part of a worm speed reducer 15S according to the ninth embodiment of the present invention.
  • the worm reducer 15S of the ninth embodiment is mainly different from the worm reducer 15 of the first embodiment of FIG.
  • the worm reducer 15S includes a spacer 130 that regulates the set length SL of the compression coil spring 70.
  • the spacer 130 is made of, for example, a cylindrical pin (shaft-shaped body).
  • the spacer 130 and the compression coil spring 70 are arranged in series.
  • the spacer 130 includes a first end 131 and a second end 132 disposed on the opposite sides in the axial direction.
  • a support hole 17 b as a support portion is provided on the inner surface of the housing portion 17 a of the housing 17.
  • the first end 131 is supported by being fitted to the inner periphery 17c of the support hole 17b.
  • the first end 131 is received by the bottom 17d of the support hole 17b.
  • the support hole 17b has a depth DL.
  • the second end 132 includes a second spring seat 133 (second receiving seat) that receives the second end 72 of the compression coil spring 70 on the opposite side of the first spring seat 55 (first receiving seat).
  • the set length SL of the compression coil spring 70 can be easily adjusted by changing the specification of the spacer 130 (for example, the length of the pin). Further, the set length SL of the compression coil spring 70 can be easily adjusted by changing the depth DL of the support hole 17 b of the housing 17.
  • the worm reducer 15T according to the tenth embodiment shown in FIGS. 16 and 17 is mainly different from the worm reducer 15S according to the ninth embodiment shown in FIG.
  • the spacer 130T of the tenth embodiment has the same configuration as the configuration in which the connection protrusion 134 is removed from the spacer 130 of the ninth embodiment.
  • the spacer 130T receives the second end 72 of the compression coil spring 70 by a spring seat 133T (second receiving seat) having a flat surface.
  • the pair of support guides 44b are extended on the back surface of the lid member main body 44a. As shown in FIG. 17, the pair of support guides 44b are formed in a plate shape extending parallel to the first direction Y1, and are separated from each other. A part of the spacer 130T and a part of the compression coil spring 70 are disposed between the pair of support guides 44b.
  • the pair of support guides 44b are springs as restraining portions that support the outer diameter portion of the compression coil spring 70 so as to restrain the movement of the compression coil spring 70 in the direction intersecting the urging direction (second direction Y2). It constitutes a guide.
  • FIG. 18 is a cross-sectional view of a main part of a worm reduction gear 15U according to the eleventh embodiment of the present invention.
  • the worm reducer 15U of the eleventh embodiment is mainly different from the worm reducer 15P of the second embodiment of FIG.
  • the worm reduction gear 15U includes a spacer 130U that regulates the set length SL of the compression coil spring 70.
  • the spacer 130U is made of, for example, a cylindrical pin (shaft-shaped body).
  • the spacer 130U and the compression coil spring 70 are arranged in series.
  • the spacer 130 ⁇ / b> U includes a first end 131 ⁇ / b> U and a second end 132 disposed on the opposite sides in the axial direction.
  • the screw hole 88 which provides the connection hole as a support part is provided in the inner surface of the main-body part 81U of the interposition member 80U hold
  • the spacer 130U includes a screw protrusion 135 as a connection protrusion that protrudes outward in the axial direction of the spacer 130U from the first end 131U.
  • the spacer 130U is supported by the interposed member 80U by screwing the screw protrusion 135 into the screw hole 88.
  • the first end 131U forms a positioning step 136 around the screw protrusion 135.
  • the positioning step 136 abuts against the inner surface of the main body 81U of the interposed member 80U, so that the spacer 130U is positioned in the axial direction of the spacer 130U (the pin length direction) with respect to the interposed member 80U.
  • the worm reducer 15V of the twelfth embodiment of FIG. 19 is mainly different from the worm reducer 15 of the first embodiment of FIG.
  • the housing 17V is formed with a holding hole 61V that is a through hole in the axial direction X that communicates with the housing portion 17a.
  • the bearing holder 50V, the compression coil spring 70V as an urging member, and the buffer member 140 are accommodated in the holding hole 61V.
  • the bearing holder 50V includes a main body 51V and a spring seat forming portion 52V as a receiving seat forming member.
  • the bearing holder 50 ⁇ / b> V holds the second bearing 34.
  • the main body 51V includes a ring part 51Va into which the outer ring 43 is press-fitted, and an end wall part 51Vb provided at one end of the ring part 51Va.
  • the spring seat forming portion 52V has a block shape that protrudes axially outward X2 from the end wall portion 51Vb.
  • a first stopper portion 170 that restricts the amount of movement of the bearing holder 50V in the first direction Y1 is formed on the inner surface of the first portion 151 of the holding hole 61V on the first direction Y1 side. ing.
  • the first stopper portion 170 faces the outer periphery of the ring portion 51Va of the main body portion 51V of the bearing holder 50V through the second gap S20.
  • the outer surface of the spring seat forming portion 52V has a first surface 181, a second surface 182, a pair of guided portions 54V, and an end surface 183.
  • the second surface 182 faces the second facing portion 162 of the second portion 152 of the holding hole 61V via the first gap S10.
  • the first surface 181 is opposed to the first facing portion 161 of the second portion 152 of the holding hole 61V through the buffer member 140.
  • the buffer member 140 is disposed between the housing 17V and the spring seat forming portion 52V, and is sandwiched between the first surface 181 of the housing 17V and the first facing portion 161 of the spring seat forming portion 52V. Further, as shown in FIG. 19, the buffer member 140 is disposed on the axially outer side X ⁇ b> 2 of the second bearing 34.
  • the first facing portion 161 approaches the first surface 181 and the buffer member 140 is compressed.
  • the outer periphery of the ring portion 51Va of the main body 51V of the bearing holder 50V approaches the first stopper portion 170 by an amount equal to the compression amount of the buffer member 140.
  • the distance F (corresponding to the thickness of the buffer member 140) between the first surface 181 and the first facing portion 161 is set to be larger than the gap amount E of the second gap S20 (F> E). For this reason, at the normal time, the bearing holder 50B does not contact the housing 17V, and the generation of hitting sound is suppressed.
  • the buffer member 140 when the buffer member 140 is disposed on a stopper part that contacts the first stopper part 170, a structure in which the buffer member 140 is integrally attached to the stopper part to form a unit is required. On the other hand, in this embodiment, since the buffer member 140 is disposed at a position separated from the first stopper portion 170, a structure in which the buffer member 140 is integrally attached to the stopper component to form a unit is not required.
  • the pair of guided portions 54V is along the pair of guide portions 64V, respectively.
  • the pair of guide portions 64V allows the bearing holder 50V to move in the first direction Y1 and the second direction Y2, while rotating the bearing holder 50V and moving in the direction orthogonal to the first direction Y1 and the second direction Y2. Is limiting.
  • the first spring seat 55V receives the first end 71V of the compression coil spring 70V.
  • the first spring seat 55V receives the biasing load of the compression coil spring 70V.
  • the first spring seat 55V is disposed on the end surface 18d of the second end 18b of the worm shaft 18 so as to be adjacent to the axial direction X. As shown in FIG.
  • the spring guide 60 restrains the movement of the first end portion 71V of the compression coil spring 70V in the direction intersecting the urging direction (second direction Y2) of the compression coil spring 70V.
  • the spring guide 60 guides the expansion and contraction of the compression coil spring 70V.
  • the buffer member 140 is arranged on the second end 18b of the worm shaft 18 and at least one axially outward X2 of the second bearing 34. As shown in FIG. 20, the buffer member 140 is disposed between the spring seat forming portion 52V and the housing 17V.
  • the housing 17V forms a second spring seat 161V as a second receiving seat for receiving the second end 72V of the compression coil spring 70V in the first facing portion 161 of the second portion 152 of the holding hole 61V.
  • the buffer member 140 includes a rubber member.
  • the buffer member 140 is formed, for example, in a plate shape.
  • the buffer member 140 includes a spring guide 141 as a second restraining portion.
  • the buffer member 140 forms an insertion hole 142 through which the second end 72V of the compression coil spring 70V is inserted.
  • a spring guide 141 that supports the outer diameter of the second end portion 72 ⁇ / b> V is formed by the inner surface of the insertion hole 142.
  • the spring guide 141 restrains the movement of the second end portion 72V in the direction intersecting the urging direction (second direction Y2) of the compression coil spring 70V.
  • the compression coil spring 70V is interposed between the spring seat 161V of the first facing portion 161 of the second portion 152 of the holding hole 61V and the first spring seat 55V of the spring seat forming portion 52V of the bearing holder 50V. Incorporated into the housing 58. In this state, the first end portion 71V of the compression coil spring 70V is restrained from moving in the direction intersecting the biasing direction (second direction Y2) by the spring guide 60 as the first restraining portion formed of the inner surface of the recess 59. Is done.
  • the compression coil spring 70V can be incorporated into the accommodating portion 58 from the axially outward X2 side.
  • the buffer member 140 is incorporated between the first facing portion 161 of the second portion 152 of the holding hole 61V and the first surface 181 of the spring seat forming portion 52V of the bearing holder 50V from the axially outward X2 side. .
  • the second end 72V of the compression coil spring 70V is introduced into the insertion hole 142 through the opening 143 of the buffer member 140.
  • the second end portion 72V of the compression coil spring 70V is moved in a direction intersecting the biasing direction (second direction Y2) by the spring guide 141 (second restraining portion) formed by the inner surface of the insertion hole 142. Be bound.
  • the lid member 44 is attached to the housing 17V, and the end portion of the holding hole 61V in the axial direction X2 is closed by the lid member 44.
  • the buffer member 140 is interposed between the lid member 44 and the end wall portion 51Vb of the main body portion 51V of the bearing holder 50V. For this reason, the buffer member 140 is positioned in the axial direction X.
  • FIG. 23 is a cross-sectional view of a main part of a worm speed reducer 15W according to a thirteenth embodiment of the present invention.
  • FIG. 24 is an exploded perspective view of a main part of the worm speed reducer 15W.
  • the worm reducer 15W of the thirteenth embodiment shown in FIGS. 23 and 24 is mainly different from the worm reducer 15V of the twelfth embodiment shown in FIGS. 19 and 21 in the following.
  • the bearing holder 50W of the worm reduction gear 15W includes a main body 51W and a spring seat forming portion 52W as a receiving seat forming member.
  • the main body 51W and the spring seat forming portion 52W are integrally formed of a resin material such as polyamide resin.
  • the main body 51W includes a fitting part 51We, an end wall part 51Wf, and a pair of flanges 51Wg and 51Wh.
  • the fitting portion 51We is formed in a C shape that fits at least a half circumference of the outer circumference 43a of the outer ring 43 of the second bearing 34. For this reason, the 2nd bearing 34 can be assembled
  • the C-shape formed by the fitting portion 51We is open toward the second direction Y2 (biasing direction).
  • the compression coil spring 70V urges the bearing holder 50W in the direction in which the C-shape of the fitting portion 51We opens, so that the fitting portion 51We does not come off from the second bearing 34.
  • the pair of flanges 51Wg and 51Wh are extended radially inward from both ends in the axial direction X of the fitting portion 51We.
  • the pair of flanges 51Wg and 51Wh are in contact with the pair of end surfaces 43b of the outer ring 43 of the second bearing 34, respectively.
  • One flange 51Wh has a rib shape adjacent to the end wall 51Wf of the main body 51W.
  • the spring seat forming portion 52W is different from the spring seat forming portion 52V of the twelfth embodiment only in that the second surface 182W is formed on a flat surface parallel to the first surface 181.
  • the bearing holder 50W holds the outer ring 43 of the second bearing 34 by the C-shaped fitting portion 51We and the pair of flanges 51Wg and 51W. For this reason, even if the bearing holder 50W undergoes a temperature change or a dimensional change due to water absorption, the bearing holder 50W can be prevented from dropping off from the second bearing 34.
  • a holding hole 61X is formed in the housing 17X.
  • the holding hole 61X is a through hole in the axial direction X that communicates with the housing portion 17a.
  • One end of the holding hole 61X (the end on the axially outward X2 side) is open.
  • an enlarged diameter portion 61Xa is formed at the one end of the holding hole 61X.
  • a stepped portion 61Xb is formed at the end of the enlarged diameter portion 61Xa on the worm shaft 18 side.
  • the worm speed reducer 15X includes a lid member 44X, a bearing holder 50X, a compression coil spring 70X as an urging member, and a buffer member 240.
  • the lid member 44X, the bearing holder 50X, the compression coil spring 70X, and the buffer member 240 constitute a pre-assembled subassembly SA.
  • the subassembly SA is accommodated and held in the holding hole 61X.
  • the subassembly SA is assembled into the holding hole 61X from one end side (the axially outward X2 side that is the open side) of the holding hole 61X.
  • the lid member 44X is fixed to the holding hole 61X of the housing 17X, and the bearing holder 50 is supported by the lid member 44X. That is, the holding hole 61X indirectly holds the bearing holder 50X via the lid member 44X.
  • the bearing holder 50 ⁇ / b> X holds the second bearing 34.
  • the compression coil spring 70X is interposed between the lid member 44X and the bearing holder 50X.
  • the buffer member 240 is a C-shaped member interposed between the housing 17 and the bearing holder 50X.
  • the buffer member 240 is interposed between the inner periphery 61Xc of the holding hole 61X of the housing 17 and the outer periphery of the bearing holder 50X facing the inner periphery 61Xc. Generation of contact hitting sound with the bearing holder 50X is suppressed.
  • the buffer member 240 is made of elastic rubber or resin.
  • the lid member 44X includes a lid member main body 44Xa, a key 44Xb as a guide portion, and a pair of engaging convex portions 44Xc.
  • the lid member 44X is made of resin or metal.
  • the lid member main body 44Xa is formed in a circular plate shape.
  • the lid member main body 44Xa includes an outer periphery 44Xd, a first end surface 44Xe that is an inner surface (surface on the worm shaft 18 side), and a second end surface 44Xf that is an outer surface.
  • a key 44 ⁇ / b> Xb as a guide portion is formed to protrude from the first end surface 44 ⁇ / b> Xe of the lid member main body 44 ⁇ / b> Xa.
  • a pair of engaging convex portions 44Xc are formed so as to protrude from the first end face 44Xe.
  • the key 44Xb of the lid member 44X is composed of a T-shaped protrusion formed in a T shape when viewed from the urging direction (second direction Y2) of the compression coil spring 70X.
  • the key 44Xb is an integral key formed integrally with the lid member main body 44Xa.
  • the key 44Xb extends longitudinally in the second direction Y2.
  • the second end face 44Xf of the lid member main body 44Xa is formed with a rectangular groove 44Xp as a display portion for positioning the lid member 44X in the circumferential direction of the holding hole 61X when the subassembly SA is assembled into the holding hole 61X. .
  • the rectangular groove 44Xp extends in the second direction Y2 in parallel with the key 44Xb.
  • the rectangular groove 44Xp is aligned with, for example, a display portion (not shown) such as a recess provided in the peripheral portion of the holding hole 61X of the housing 17.
  • a convex portion, a concave portion, a coating portion of paint, or the like can be used.
  • the bearing holder 50X includes a fitting portion 51X and an end wall-shaped spring seat forming portion 52X disposed in a portion on the axially outward X2 side of the fitting portion 51X.
  • the bearing holder 50X is integrally formed of a resin material such as polyamide resin.
  • the fitting portion 51X is formed in a C-shape that fits at least a half circumference of the outer periphery 43a of the outer ring 43 of the second bearing 34.
  • the C-shape formed by the fitting portion 51X is open toward the second direction Y2 (worm wheel 19 side).
  • a holding groove 51Xb extending in the circumferential direction is formed on the outer periphery 51Xa of the fitting portion 51X.
  • the buffer member 240 is fitted and held in the holding groove 51Xb.
  • the buffer member 240 includes a C-shaped main body 241 and angle-shaped engaging claws 242 that are formed at a pair of circumferential ends 241 a of the main body 241 and project inwardly.
  • the main body 241 has an escape portion 243 formed of a notch that avoids interference with the key 44Xb of the lid member 44X.
  • the engaging claw 242 is spaced radially outward from the outer ring 43 of the second bearing 34.
  • the C-shaped fitting portion 51X of the bearing holder 50X has an engagement recess 51Xd formed at a pair of circumferential end portions 51Xc.
  • each engaging claw 242 of the buffer member 240 is hooked and engaged with the corresponding engaging recess 51Xd of the bearing holder 50X. Thereby, the buffer member 240 is held by the bearing holder 50X.
  • a first stopper portion 170 is provided on the inner periphery 61Xc of the holding hole 61X at a portion on the first direction Y1 side of the fitting portion 51X of the bearing holder 50X.
  • the first stopper 170 part faces the outer periphery 51Xa of the fitting part 51X of the bearing holder 50X via the second gap S20.
  • the thickness of the buffer member 240 is larger than the gap amount of the second gap S20.
  • the spring seat forming portion 52X includes a key groove 52Xa as a guided portion that is key-coupled to the key 44Xb (guide portion) of the lid member 44X, and a first spring as a first receiving seat. And a seat 55X.
  • the first spring seat 55X is disposed on the end surface 18d of the second end 18b of the worm shaft 18 so as to be adjacent to the axial direction X. As shown in FIG. The first spring seat 55X is disposed at a position relatively close to the central axis C1 in the radial direction. For this reason, even if the dimension of the spring seat formation part 52X changes with temperature changes, the change of the position of the 1st spring seat 55X is small. Therefore, the set length of the compression coil spring 70X hardly changes, and the bias load is stabilized.
  • the first spring seat 55X is formed at the bottom of the keyway 52Xa in the second direction Y2, and receives the first end 71X of the compression coil spring 70X as shown in FIG.
  • the key groove 52Xa is a T-shaped groove formed in a T shape when viewed from the biasing direction (second direction Y2) of the compression coil spring 70X.
  • the keyway 52Xa is opened toward the first direction Y1.
  • the key 44Xb (guide portion) of the lid member 44X is key-coupled with the key groove 52Xa (guided portion) of the bearing holder 50X, and the biasing direction (first direction) of the compression coil spring 70X is obtained.
  • 2 direction Y2) and the movement of the bearing holder 50X in the direction opposite to the urging direction (first direction Y1) are guided.
  • the key 44Xb of the lid member 44X has a facing surface 44Xh facing the first spring seat 55X in the first direction Y1.
  • the key 44Xb penetrates the opposing surface 44Xh and forms an accommodating portion 44Xj formed of a circular hole that accommodates a part of the compression coil spring 70X.
  • a second spring seat 44Xk as a second receiving seat for receiving the other end 72X of the compression coil spring 70X is disposed on the bottom of the housing portion 44Xj in the first direction Y1.
  • a spring guide 44Xm that supports the outer diameter portion of the compression coil spring 70X and suppresses the collapse of the compression coil spring 70X is formed on the inner peripheral surface of the housing portion 44Xj.
  • the pair of engaging convex portions 44Xc of the lid member 44X engage with the bearing holder 50X in the state of the subassembly SA, and apply the biasing load of the compression coil spring 70X via the bearing holder 50X. receive.
  • the engagement convex portion 44Xc engages with the end portion 52Xb on the second direction Y2 side (worm wheel 19 side) of the spring seat forming portion 52X.
  • the engaging surface 44Xn of the engaging convex portion 44Xc that engages with the end portion 52Xb of the spring seat forming portion 52X is displaced in the first direction Y1 toward the worm shaft 18 side. It is formed on the inclined surface.
  • the bearing holder 50X, the lid member 44X, and the compression coil spring 70X can be collectively assembled into the holding hole 61X of the housing 17 as the subassembly SA, and the assemblability is improved.
  • the worm shaft 18 is incorporated into the housing portion 17a of the housing 17X from the second end portion 18b side (second bearing 34 side).
  • the guide portion (key 44Xb) of the lid member 44X causes the second end portion 18b of the worm shaft 18 to be opposed to the biasing direction (second direction Y2) of the compression coil spring 70X and the biasing direction via the bearing holder 50X. It is possible to smoothly guide in the direction (first direction Y1).
  • the key 44Xb (guide portion) of the lid member 44X and the key groove 52Xa (guided portion) of the bearing holder 50X are combined with each other, and the second member of the worm shaft 18 is formed while unitizing the lid member 44X and the bearing holder 50X.
  • the function of guiding the end 18b can be achieved.
  • the biasing load of the compression coil spring 70X is exerted on the lid member 44X and the bearing holder 50X, so that the lid member 44X, the bearing holder 50X, and the compression coil spring 70X are unitized. Can be achieved.
  • the subassembly SA includes the buffer member 240, the assemblability is further improved as compared with the case where the buffer member 240 is separately incorporated.
  • the bearing holder 50X includes a C-shaped fitting portion 51X that opens to the worm wheel 19 side. For this reason, even if the worm shaft 18 is miniaturized in the axial direction X so that the second end portion 18b of the worm shaft 18 approaches the first end portion 18a, there is no possibility that the bearing holder 50X interferes with the worm wheel 19.
  • the worm speed reducer 15X can be reduced in size with respect to the axial direction X of the worm shaft 18 as much as possible.
  • the present invention is not limited to each of the above-described embodiments, and instead of a compression spring or a tension spring, a rod-like elastic body made of resin or rubber may be used.
  • the electric power steering device 1 may be an electric power steering device that applies the power of the electric motor 14 to the pinion shaft 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Gear Transmission (AREA)
  • Power Steering Mechanism (AREA)
  • Support Of The Bearing (AREA)
  • General Details Of Gearings (AREA)

Abstract

Un élément de formation de plaque d'impact (52, 52Q, 52S, 52T, 52V, 52W, 52X) est agencé sur une bague extérieure (4) d'un second palier (34), qui supporte une seconde partie d'extrémité (18b) d'un arbre (18) à vis sans fin. L'élément de formation de plaque d'impact forme une plaque d'impact (55, 55Q, 55V, 55X) agencée sur le côté axialement externe (X2) de la seconde partie d'extrémité (18b) et/ou sur le second palier (34). Un élément de poussée (70, 70Q, 90, 100, 110, 120, 70V, 70X) est adjacent dans la direction axiale (X) à la seconde partie d'extrémité et/ou au second palier, et est agencé entre un carter (17, 17V, 17X) et la plaque d'impact. L'élément de poussée pousse la seconde partie d'extrémité par rapport au carter, l'élément de formation de plaque d'impact et le second palier étant intercalés entre ceux-ci, de sorte que l'arbre (18) à vis sans fin se déplace plus près d'une roue (19) à vis sans fin.
PCT/JP2016/058546 2015-03-18 2016-03-17 Roue réductrice à vis sans fin et dispositif de direction à énergie électrique Ceased WO2016148248A1 (fr)

Priority Applications (1)

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JP2017506617A JP6731164B2 (ja) 2015-03-18 2016-03-17 ウォーム減速機および電動パワーステアリング装置

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JP2015055173 2015-03-18
JP2015-055173 2015-03-18
JP2015-139915 2015-07-13
JP2015139915 2015-07-13
JP2015210112 2015-10-26
JP2015-210112 2015-10-26

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CN110691928A (zh) * 2017-05-31 2020-01-14 捷太格特欧洲公司 用于减速器壳体的支承啮合游隙补偿支架的密封插塞
KR20240123100A (ko) * 2023-02-06 2024-08-13 주식회사 코렌스이엠 전동 사이드스텝 구동장치
US20250033693A1 (en) * 2023-07-26 2025-01-30 Zf Friedrichshafen Ag Steering system for use in turning steerable vehicle wheels

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JPH0796441A (ja) * 1993-09-24 1995-04-11 Eisuke Yokoyama ウォーム・ウォームホイール機構におけるバックラッシュ除去構造
JP2005104366A (ja) * 2003-09-30 2005-04-21 Koyo Seiko Co Ltd 電動パワーステアリング装置
JP2014126059A (ja) * 2012-12-25 2014-07-07 Hitachi Automotive Systems Steering Ltd パワーステアリング装置及びバックラッシュ調整機構
JP2015003611A (ja) * 2013-06-20 2015-01-08 株式会社ジェイテクト 電動パワーステアリング装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0796441A (ja) * 1993-09-24 1995-04-11 Eisuke Yokoyama ウォーム・ウォームホイール機構におけるバックラッシュ除去構造
JP2005104366A (ja) * 2003-09-30 2005-04-21 Koyo Seiko Co Ltd 電動パワーステアリング装置
JP2014126059A (ja) * 2012-12-25 2014-07-07 Hitachi Automotive Systems Steering Ltd パワーステアリング装置及びバックラッシュ調整機構
JP2015003611A (ja) * 2013-06-20 2015-01-08 株式会社ジェイテクト 電動パワーステアリング装置

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110691928A (zh) * 2017-05-31 2020-01-14 捷太格特欧洲公司 用于减速器壳体的支承啮合游隙补偿支架的密封插塞
US20200208735A1 (en) * 2017-05-31 2020-07-02 Jtekt Europe Sealing plug for a reducer casing, bearing a meshing play-compensating carriage
JP2020521924A (ja) * 2017-05-31 2020-07-27 ジェイテクト ユーロップ プラグ、プラグ要素及び減速機
CN110691928B (zh) * 2017-05-31 2023-04-04 捷太格特欧洲公司 用于减速器壳体的支承啮合游隙补偿支架的密封插塞
US11635135B2 (en) 2017-05-31 2023-04-25 Jtekt Europe Sealing plug for a reducer casing, bearing a meshing play-compensating carriage
JP7314060B2 (ja) 2017-05-31 2023-07-25 ジェイテクト ユーロップ プラグ、プラグ要素及び減速機
KR20240123100A (ko) * 2023-02-06 2024-08-13 주식회사 코렌스이엠 전동 사이드스텝 구동장치
KR102812613B1 (ko) 2023-02-06 2025-05-26 주식회사 코렌스이엠 전동 사이드스텝 구동장치
US20250033693A1 (en) * 2023-07-26 2025-01-30 Zf Friedrichshafen Ag Steering system for use in turning steerable vehicle wheels

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JPWO2016148248A1 (ja) 2017-12-28

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