CN106640468B - The starter of internal combustion engine - Google Patents

Abstract

The present invention provides a starting device for an internal combustion engine in which a movement restricting member for restricting movement of a pinion gear to a ring gear side due to an elastic member can be suppressed from coming off due to rotational centrifugal force, and the assembly workability of the movement restricting member can be improved. It is easy to manufacture, and an increase in the number of components can be suppressed. The force-applying pinion includes: a pinion member having a pinion tooth portion and a pinion extension; an intermediate connection member having a spline joint portion and an enlarged inner diameter portion; The elastic member for biasing the first side; and the movement restricting member fitted into the pinion extension portion and abutted against the step surface between the spline coupling portion and the enlarged inner diameter portion, the axial length ratio of the enlarged inner diameter portion from the base portion of the mobile body The movable width of the pinion gear member in the state where the biasing pinion gear portion is released is short.

Description

Starting device for internal combustion engine

technical field

The invention relates to a starting device for an internal combustion engine having a pinion gear movable in the axial direction.

Background technique

In the starting device of the internal combustion engine, the pinion gear meshes with the ring gear of the internal combustion engine to transmit the rotational driving force of the electric motor to the internal combustion engine, thereby starting the internal combustion engine. In the techniques of Patent Document 1 and Patent Document 2, an elastic member is provided on the moving body of the pinion gear, and the meshing between the pinion gear and the ring gear is strengthened by the elastic force of the elastic member.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2006-161590

Patent Document 2: Japanese Patent Application Publication No. 2013-515910

Contents of the invention

The technical problem to be solved by the invention

However, in the technology of Patent Document 1, the pinion stopper member 26 for restricting the movement of the pinion to the ring gear side by the elastic member is fitted to the outer peripheral surface of the inner tube 23 which rotates integrally with the output shaft. Therefore, depending on the material and shape of the pinion stopper 26 , the rotational centrifugal force of the output shaft may increase the diameter of the pinion stopper 26 , thereby deteriorating the connection reliability with the inner tube 23 .

In the technique of Patent Document 2, a position fixing member 76 for restricting the movement of the pinion gear to the ring gear side by the elastic member is inserted into the radially inner side of the hollow shaft 34 at the mounting position. Therefore, the gap in the radial direction between the hollow shaft 34 and the mounting position of the position fixing member 76 is enlarged, thereby facilitating insertion of the position fixing member 76 . On the other hand, in the technology of Patent Document 2, the diameter of the position fixing member 76 is enlarged due to the rotational centrifugal force of the output shaft. The gap between the bushing members is embedded. However, in the technique of Patent Document 2, it is necessary to additionally provide a bushing member, and there is a problem of an increase in manufacturing cost.

Therefore, it is desired to obtain a starting device for an internal combustion engine, in which the movement restricting member for restricting the movement of the pinion gear to the ring gear side due to the elastic member can be suppressed from coming off due to the centrifugal force of rotation, and the movement Mounting workability of the restricting member is easy, and an increase in the number of members can be suppressed.

Technical means used to solve technical problems

The starting device for an internal combustion engine according to the present invention includes: an electric motor; an output shaft transmitting the rotational driving force of the electric motor; a mobile body base part and a biasing pinion gear part that is connected to the mobile body base part via a one-way clutch and uses an elastic member to bias the pinion toward one side in the axial direction, that is, the first side in the axial direction; The electric push-out mechanism engages with the base part of the moving body, and moves the pinion moving body toward the first side of the axial direction when energized, and moves the pinion when energized. The body portion moves toward a second side in the axial direction opposite to the first side in the axial direction, and the urging pinion portion includes a pinion member that is a barrel disposed radially outside the output shaft. A member having a pinion gear tooth portion formed with external teeth of the pinion gear, and a pinion gear extension extending from the pinion gear tooth portion to the second side in the axial direction; an intermediate connecting member, the intermediate connecting structure The member is a tubular member disposed radially outside the pinion member and constituting the inner wheel of the one-way clutch, and has a spline coupling portion spline-coupled with the pinion extension portion, and the spline coupling portion extends toward the second axial side, and has an inner diameter larger than the enlarged inner diameter portion of the spline coupling portion; the elastic member for biasing; and a movement restricting member which is an annular member fitted into a recess formed on the outer peripheral surface of the pinion extension part and extending in the circumferential direction, and arranged on the spline whose inner diameter varies. The second side in the axial direction of the stepped surface between the coupling portion and the enlarged inner diameter portion restricts the direction of the pinion gear member relative to the intermediate connecting member by abutting against the stepped surface. In the axial first side movement, the axial length ratio of the enlarged inner diameter portion separates the biasing pinion portion from the base portion of the moving body, and the pinion member is relative to the intermediate link. The movable range that the member can move to the second side of the axial direction is short.

Invention effect

According to the starting device for an internal combustion engine according to the present invention, in a state where the energizing pinion gear portion is detached from the base portion of the mobile body, the elastic member is contracted so that the pinion gear member faces toward the second side in the axial direction relative to the intermediate coupling member. In the case of shifting the movable range, the enlarged inner diameter portion is not disposed radially outside of the recess formed on the outer peripheral surface of the pinion extension portion. Therefore, the annular movement restriction member can be fitted into the concave portion from the radially outer side, and the assembly workability of the movement restriction member can be facilitated.

On the other hand, when the biasing pinion is assembled to the base of the moving body and the elastic member is stretched, since the enlarged inner diameter portion of the intermediate connecting member is arranged radially outside the movement limiting member, it is possible to The expansion of the diameter of the movement regulating member due to the rotational centrifugal force can be suppressed, so that the movement regulating member can be suppressed from coming off. In addition, since the enlarged inner diameter portion is a part of the intermediate connecting member that supports the second side of the elastic member in the axial direction and constitutes the inner wheel of the one-way clutch, an increase in the number of members can be suppressed.

Description of drawings

FIG. 1 is a partial cross-sectional view of a starter device for an internal combustion engine according to Embodiment 1. FIG.

2 is a cross-sectional view of the urging pinion according to Embodiment 1 when the elastic member is stretched in a state where the urging pinion is detached from the mobile body base.

Fig. 3 is a cross-sectional view of the urging pinion in accordance with Embodiment 1 when the elastic member is contracted in a state where the urging pinion is detached from the mobile body base.

4 is a cross-sectional view of an energizing pinion when the movement restricting member is detached from the state of FIG. 3 according to Embodiment 1. FIG.

5 is a cross-sectional view of the pinion moving body part in a state where the biasing pinion gear part is assembled to the moving body base part according to the first embodiment.

Detailed ways

Embodiment 1

A starter device 1 for an internal combustion engine (hereinafter simply referred to as a starter device 1 ) according to Embodiment 1 will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of the starting device 1 cut on a plane passing through the rotation axis H of the electric motor 3 . The details of each member will be described later, and FIGS. 2 to 4 are cross-sectional views of the urging pinion 30 in a state where the urging pinion 30 is disassembled from the moving body base 25 . 5 is a cross-sectional view of the pinion moving body 20 in a state where the biasing pinion 30 is assembled to the moving body base 25 via the one-way clutch 31 .

The direction parallel to the rotation axis H of the electric motor 3 is defined as an axial direction X, and one side of the axial direction X is defined as an axial first side X1 (the right side in FIGS. 1 to 5 ), and the axial direction X The side opposite to the axial first side X1 is defined as the axial second side X2 (the left side in FIGS. 1 to 5 ).

The starting device 1 includes: an electric motor 3; an output shaft 7 that transmits the rotational driving force of the electric motor 3; a pinion moving body 20 that is helically spline-coupled to the output shaft 7 and has a pinion 21 and a one-way clutch 31; The electric extrusion mechanism 4 that moves the pinion moving body 20 to the first side X1 in the axial direction and moves the moving pinion body 20 to the second side X2 in the axial direction when no power is applied. Each member will be described in detail below.

The electric motor 3 is an electric motor including a cylindrical stator 40 fixed to the inner peripheral surface of the motor case 37 , and a cylindrical rotor 41 disposed radially inside the stator 40 and rotatably supported by bearings. A DC series motor is used for the electric motor 3 . The stator 40 includes permanent magnets, and the rotor 41 includes a winding and a commutator. The motor case 37 is formed in a bottomed cylindrical shape that is open on the first side X1 in the axial direction.

The rotational driving force of the electric motor 3 is transmitted to the output shaft 7 . In the present embodiment, the rotor shaft 42 which is the rotation shaft of the rotor 41 is connected to the output shaft 7 via the speed reducer 50 . The electric motor 3, the speed reducer 50 and the output shaft 7 are arranged coaxially on the rotation axis H, the speed reducer 50 is arranged on the axial first side X1 of the electric motor 3, and the speed reducer 50 is arranged on the first axial side X1 of the speed reducer 50. Output shaft 7. The speed reducer 50 is a single-pinion type planetary gear mechanism, and has: a carrier 53 supporting a plurality of planetary gears 52; The planetary gears 52 mesh with an internally toothed ring gear 54 . A sun gear 51 is formed on the rotor shaft 42 , a wheel carrier 53 is connected to the output shaft 7 , and a ring gear 54 is fixed to the inner peripheral surface of the motor case 37 .

The output shaft 7 is formed in a cylindrical shape extending from the speed reducer 50 to the first side X1 in the axial direction on the rotation axis H. The end portion of the output shaft 7 on the second axial side X2 is connected to the wheel carrier 53 , and the end portion of the output shaft 7 on the first axial side X1 is rotatably supported by the front housing 38 via a bearing. The front housing 38 is a cover plate member that accommodates the portion of the starter device 1 on the first side X1 in the axial direction (the output shaft 7 , the pinion moving body portion 20 , the shift lever 66 , and the like) inside. The output shaft 7 supports a substantially cylindrical pinion moving body 20 from the inside in the radial direction.

The portion of the first side X1 in the axial direction of the wheel frame coupling portion on the output shaft 7 is a cylindrical output shaft spline coupling portion 45, and the output shaft spline coupling portion 45 is formed with a helical screw for helical spline coupling on the outer peripheral surface. spline groove. The helical spline grooves are formed as a plurality of helical grooves extending obliquely with respect to the axial direction X, and the plurality of helical grooves are formed at equal intervals over the entire circumference in the circumferential direction.

A portion of the output shaft spline coupling portion 45 on the output shaft 7 on the first side X1 in the axial direction serves as a moving body supporting portion 47 that supports the energizing pinion portion 30 of the pinion moving body portion 20 from the radially inner side, which will be described later. The moving body support portion 47 is formed in a cylindrical shape having a diameter smaller than that of the output shaft spline coupling portion 45 . The biasing pinion 30 moves in the axial direction X along the moving body support 47 . A cylindrical stopper member 8 for restricting movement of the pinion moving body 20 (pinion 21 ) to the first axial side X1 is attached to an end portion of the moving body supporting portion 47 on the first axial side X1.

The electric push-out mechanism 4 is an electric actuator that moves the pinion moving body 20 toward the first axial side X1 when energized, and moves the pinion moving body 20 toward the second axial side X2 when energized. In this embodiment, the electric extruding mechanism 4 is disposed radially outside the electric motor 3 . The electric extrusion mechanism 4 has: a plunger 62 that can move in the axial direction X and is made of a magnetic body; a plunger spring 63 that applies force to the first side X1 in the axial direction to the plunger 62; an electromagnetic coil 64 attracting in the axial second side X2; and a shift lever that reverses the movement of the plunger 62 in the axial direction X in the first side X1 and the second side X2 and transmits it to the pinion moving body 20 66. The shift lever 66 is a rod-shaped member that can rotate around the fulcrum portion 65 provided in the middle and extends in the radial direction. The fork-shaped radially inner end portion is engaged with the pinion moving body portion 20 (the engaging portion 36 of the moving body base portion 25 ). For example, when the user turns on the starter switch, the electromagnetic coil 64 is powered by a DC power source such as a battery, and becomes an energized state; In the present embodiment, the plunger 62 is made of a magnetic body, and includes: a bottomed cylindrical plunger main body 68 that opens on the first side X1 in the axial direction; The plunger pin 69 ; and the pin spring 61 biasing the plunger pin 69 toward the second side X2 in the axial direction relative to the plunger main body portion 68 . An end portion on the first axial side X1 of the plunger pin 69 protruding from the plunger main body portion 68 to the first axial side X1 is engaged with the shift lever 66 .

In the present embodiment, the electric pushing mechanism 4 is provided with a motor switch 67 for turning on or off the supply of DC power to the electric motor 3 . The switch contact of the motor switch 67 is arranged on the second axial side X2 of the plunger 62, and is configured such that the amount of movement of the plunger 62 (the plunger main body 68) to the second axial side X2 is a predetermined energized movement. When the amount is above, the switch contact is closed.

The pinion moving body part 20 has: a moving body base part 25 coupled to the output shaft 7 by a helical spline; The first side X1 energizes the urging pinion portion 30 . The moving body base portion 25 has a coupling portion 35 (hereinafter referred to as a moving body spline coupling portion 35 ) that is helically splined and an engaging portion 36 that engages with the electric ejector mechanism 4 . The urging pinion unit 30 has a pinion 21 and an elastic urging mechanism for urging the pinion 21 toward the first side X1 in the axial direction by using the elastic member 22 .

When the starter device 1 is assembled to the internal combustion engine, the ring gear 9 of the internal combustion engine is disposed on the axially first side X1 of the pinion gear 21 . The pinion 21 is an externally toothed gear. The ring gear 9 is an externally toothed gear formed on the outer peripheral surface of a flywheel of a crankshaft of an internal combustion engine. When power is supplied to the electric extrusion mechanism 4 , the electric extrusion mechanism 4 moves the pinion gear 21 toward the first axial side X1 so as to mesh with the ring gear 9 of the internal combustion engine. On the other hand, when power is not supplied to the electric extruder 4 , the electric extruder 4 moves the pinion gear 21 toward the second axial side X2 , thereby releasing the engagement with the ring gear 9 of the internal combustion engine. Thus, the axial first side X1 is a side that meshes with the ring gear 9 , and the axial second side X2 is a side that does not mesh with the ring gear 9 .

However, the peaks and valleys of the pinion gear 21 and the ring gear 9 do not coincide with each other depending on the state of the relative rotation angle of the two. Therefore, when the pinion 21 is moved toward the first side X1 in the axial direction, the pinion 21 may not mesh with the ring gear 9, and the end surface of the pinion 21 on the first side X1 in the axial direction is in contact with the second side in the axial direction of the ring gear 9. The end faces of the side X2 abut against each other. In this case, an elastic urging mechanism and a pin spring 61 of the plunger 62 are provided in order to rotate the pinion gear 21 and mesh it with the ring gear 9 . Specifically, after the end surface of the pinion gear 21 abuts against the end surface of the ring gear 9, the plunger main body 68 continues to move toward the second axial side X2 due to the contraction of the elastic member 22 and the pin spring 61, so that the motor switch 67 on. Then, electric power is supplied to the electric motor 3, and the electric motor 3 starts to rotate, so that the phase in which the pinion gear 21 and the ring gear 9 can engage. If the phases are consistent, the pinion 21 and the pinion moving body 20 are further moved toward the axial first side X1 due to the elongation of the elastic member 22 and the pin spring 61, so that the pinion 21 and the ring gear 9 are engaged. .

The one-way clutch 31 is a clutch mechanism that transmits rotational force only in the direction in which the rotational force is transmitted from the output shaft 7 to the ring gear 9 of the internal combustion engine, and serves as an overload prevention mechanism of the starter 1 . That is, the one-way clutch 31 is connected when the rotation speed of the pinion gear 21 is higher than the rotation speed of the ring gear 9 of the internal combustion engine, and when the rotation speed of the ring gear 9 is lower than the rotation speed of the pinion gear 21 due to the start of combustion of the internal combustion engine or the like. In case of high, unlink. In the present embodiment, the one-way clutch 31 has an outer ring 10 , an inner ring 11 , and a plurality of engagement members 12 disposed between the outer ring 10 and the inner ring 11 . The engagement member 12 is engaged with the outer wheel 10 and the inner wheel 11 when the rotational speed of the outer wheel 10 is higher than the rotational speed of the inner wheel 11, and is released from the engagement with the outer wheel 10 when the rotational speed of the outer wheel 10 is lower than that of the inner wheel 11. And the engagement between the inner wheel 11. In this example, a cam-type one-way clutch 31 is used, and cylindrical rollers are used as the engagement member 12, and springs (not shown) that bias each roller toward one side in the circumferential direction are provided.

The mobile body spline coupling portion 35 of the mobile body base portion 25 is arranged radially outward of the output shaft spline coupling portion 45 of the output shaft 7 and is formed in a cylindrical shape. A helical spline groove for engaging with a helical spline groove formed in the output shaft 7 is formed on the inner peripheral surface of the moving body spline coupling portion 35 . The moving body base portion 25 includes: an annular plate-shaped flange portion 71 extending radially outward from an end portion of the moving body spline coupling portion 35 on the first side X1 in the axial direction; A cylindrical base cylindrical portion 72 whose outer end portion extends toward the first side X1 in the axial direction. The base cylindrical portion 72 serves as the outer ring 10 of the one-way clutch 31 , and the roller 12 is disposed radially inside the base cylindrical portion 72 . In order to engage the roller 12 , the diameter of the inner peripheral surface of the base cylindrical portion 72 is different at each portion in the circumferential direction.

The outer peripheral surface of the base cylindrical portion 72 is fitted with a connection member 74 for connecting the energizing pinion portion 30 (connection plate 80 ) so as to be snap-fitted. The connection member 74 has: a cylindrical portion that fits with the outer peripheral surface of the basic cylindrical portion 72 and is snap-fitted; Ring plate. The connecting plate 80 is sandwiched and fixed from both sides in the axial direction by the annular plate-shaped portion of the connecting member 74 and the base cylindrical portion 72 . By detaching the connection member 74 from the base cylindrical portion 72 , the biasing pinion gear portion 30 can be disassembled from the mobile body base portion 25 as shown in FIGS. 2 to 4 . On the contrary, as shown in FIGS. 1 to 5 , by attaching the connection member 74 to the base cylindrical portion 72 , it is possible to assemble the urging pinion portion 30 to the moving body base portion 25 .

An annular recess recessed radially inward is formed at the central portion in the axial direction X of the outer peripheral surface of the moving body spline coupling portion 35 , and the annular plate-shaped rod stopper member 73 fits into the recess. A double-pronged end portion of the shift lever 66 is inserted into the cylindrical space between the lever stopper member 73 and the flange portion 71 . That is, the rod stopper member 73 and the flange portion 71 form the engaging portion 36 with the electric ejection mechanism 4 .

As shown in FIGS. 1 to 4 , the urging pinion portion 30 includes a pinion member 29 , an intermediate connecting member 23 , an elastic member 22 , and a movement restricting member 24 . The pinion member 29 is a cylindrical member arranged on the radially outer side of the output shaft 7 and has a pinion tooth portion 28 on which the external teeth of the pinion gear 21 are formed, and a second pinion tooth portion 28 in the axial direction from the pinion tooth portion 28 . Pinion extension 27 extending from side X2. The intermediate connection member 23 is a tubular member disposed radially outside the pinion member 29 and constitutes the inner ring 11 of the one-way clutch 31 , and has a spline coupling portion 85 spline-coupled to the pinion extension portion 27 , and the enlarged inner diameter portion 32 extending from the spline joint portion 85 to the second axial side X2 and having an inner diameter larger than the spline joint portion 85 . The elastic member 22 urges the pinion member 29 toward the axial first side X1 relative to the intermediate connecting member 23 . The movement restricting member 24 is an annular member that fits into a concave portion 33 formed on the outer peripheral surface of the pinion extension portion 27 and extends in the circumferential direction, and is disposed on the stepped surface 34 between the spline coupling portion 85 whose inner diameter changes and the enlarged inner diameter portion 32 The second side X2 in the axial direction (hereinafter referred to as the movement limiting step surface 34 ) restricts the movement of the pinion gear member 29 relative to the intermediate connection member 23 to the first side X1 in the axial direction by abutting against the movement limiting step surface 34 . move.

According to this structure, as shown in FIGS. 1 and 2 , in the state where the elastic member 22 is stretched, the enlarged inner diameter portion 32 of the intermediate connecting member 23 is arranged on the radially outer side of the movement limiting member 24 to suppress the movement of the movement limiting member 24. The diameter is enlarged by the centrifugal force of rotation, so that the movement restricting member 24 can be suppressed from coming off. In addition, the enlarged inner diameter portion 32 is a part of the intermediate connection member 23 supporting the second axial side X2 of the elastic member 22 and constituting the inner ring 11 of the one-way clutch 31 , so an increase in the number of members can be suppressed. In addition, when the pinion gear 21 meshes with the ring gear 9, the rotational speed of the electric motor 3 rises, and the rotational centrifugal force increases, since the elastic member 22 is elongated, the radially outer side of the movement restricting member 24 is reliably arranged with an enlarged inner diameter. Section 32.

The inner peripheral surface of the pinion member 29 is formed in a cylindrical shape. The inner peripheral surface of the pinion member 29 is fitted with two cylindrical bushing members 81 and fixed thereto. The inner peripheral surface of the pinion member 29 is slidably in contact with the outer peripheral surface of the moving body support portion 47 of the output shaft 7 via a bush 81 . A portion of the pinion member 29 on the first side X1 in the axial direction forms a pinion tooth portion 28 , and the outer teeth of the pinion gear 21 are formed on the outer peripheral portion of the pinion tooth portion 28 . The outer diameter of the pinion tooth portion 28 is larger than the outer diameter of the pinion extension 27 . The end portion on the axially second side X2 of the portion of the pinion tooth portion 28 protruding radially outward from the pinion extension portion 27 is formed with an annular planar stepped surface 83 ( Hereinafter referred to as pinion step surface 83). The pinion stepped surface 83 serves as a support surface that supports the elastic member 22 from the first side X1 in the axial direction. Furthermore, the end portion of the radially outer protrusion of the pinion gear tooth portion 28 on the axially second side X2 is not formed with the external teeth of the pinion gear 21 .

The portion of the pinion gear member 29 on the second side X2 in the axial direction becomes a cylindrical pinion extension 27, on the outer peripheral surface of which the pinion extension 27 is formed a spline joint that can slide in the axial direction X. Spline groove 82. The spline groove 82 is formed as a plurality of grooves extending in the axial direction X, and the plurality of grooves are formed at equal intervals in the circumferential direction over the entire circumference. In this example, the spline groove 82 is a serrated groove. The spline groove 82 is formed up to the end surface of the pinion extension 27 on the second axial side X2.

The outer peripheral surface of the pinion extension portion 27 is formed with a concave portion 33 that is recessed radially inward and extends in the circumferential direction. The recess 33 is formed near the end of the pinion extension 27 on the second axial side X2 and extends over the entire circumference. The peak portion of the spline groove 82 is cut off at the concave portion 33 . The recessed portion 33 is fitted with the annular movement restricting member 24 . The movement restricting member 24 is a C-shaped snap ring, and is formed as an annular member in which a part in the circumferential direction is cut away. When the movement restricting member 24 is fitted into the concave portion 33 , the diameter of the movement restricting member 24 increases.

The intermediate connection member 23 includes a cylindrical spline coupling portion 85 . The inner peripheral surface of the spline coupling portion 85 is formed with a spline groove 84 for engaging with the spline groove 82 formed in the outer peripheral surface of the pinion extension portion 27 . The spline groove 84 of the spline coupling portion 85 is formed as a plurality of grooves extending in the axial direction X. As shown in FIG. The end portion of the portion of the spline coupling portion 85 protruding radially inward from the enlarged inner diameter portion 32 on the second axial side X2 is formed with an annular planar movement limiting step surface 34 facing the second axial side X2. . The movement restricting step surface 34 is disposed on the axial first side X1 of the movement restricting member 24 , and when the movement restricting member 24 moves to the axial first side X1 due to the urging force of the elastic member 22 , it is aligned with the movement restricting member 24 . abut against each other, thereby limiting the movement of the movement limiting member 24 to the axial first side X1. The end surface of the spline coupling portion 85 on the first side X1 in the axial direction serves as a supporting surface for supporting the elastic member 22 from the second side X2 in the axial direction.

The outer peripheral surface of the spline coupling portion 85 is formed with a cylindrical plate recess 86 that is recessed inward in the radial direction and extends in the circumferential direction over the entire circumference. radially inner end. A gap is provided between the plate concave portion 86 and the connection plate 80 so that relative rotation is possible.

The enlarged inner diameter portion 32 is formed in a cylindrical shape extending from the end portion of the spline coupling portion 85 on the second axial side X2 to the axial second side X2 and has a larger inner diameter than the spline coupling portion 85 . The part of the outer peripheral surface of the spline coupling part 85 closer to the second axial side X2 than the plate recessed part 86 and the outer peripheral surface of the enlarged inner diameter part 32 are formed in a cylindrical shape with the same diameter, constituting the inner ring 11 of the one-way clutch 31. peripheral surface.

The intermediate coupling member 23 includes a cylindrical spring cover portion 87 that extends radially outward from the end portion of the spline coupling portion 85 on the axially first side X1 and then extends toward the axially first side X1. Side X1 extends. The spring cover portion 87 serves as a protective cover covering the radially outer side of the elastic member 22 . The inner diameter of the spring cover portion 87 is slightly larger than the outer diameter of the pinion tooth portion 28 . Therefore, as shown in FIG. 3 , when the elastic member 22 contracts, the spring cover portion 87 is disposed radially outside the pinion tooth portion 28 and does not come into contact with the pinion stepped surface 83 of the pinion tooth portion 28 . . Therefore, as shown in FIG. 2 , when the elastic member 22 is extended to the longest, the spring cover portion 87 can be extended to the first side X1 in the axial direction to the pinion step surface 83 of the pinion tooth portion 28 . Up to the axial position, the radial outer side of the entire elastic member 22 can be covered and protected.

The elastic member 22 uses a coil spring. The elastic member 22 is arranged between the end surface of the spline coupling portion 85 on the first axial side X1 and the axial direction of the pinion stepped surface 83 of the pinion tooth portion 28 , more specifically, the pinion extension portion 27 In the radial direction between the outer peripheral surface of the spring cover part 87 and the inner peripheral surface of the spring cover part 87, it is in the cylindrical space. The end face of the elastic member 22 with respect to the axially first side X1 of the spline coupling portion 85 urges the pinion stepped surface 83 of the pinion tooth portion 28 toward the axially first side X1 .

As shown in FIGS. 1 and 2 , the state where the movement limiting step surface 34 is in contact with the movement limiting member 24 is the state where the pinion gear member 29 moves to the first side X1 in the axial direction relative to the intermediate coupling member 23 at the maximum, and is the maximum stretched state where the elastic member 22 is stretched to the longest. In this maximum extension state, since the enlarged inner diameter portion 32 is disposed radially outside the recess 33 of the pinion extension 27 , the movement restricting member 24 is less likely to fall out of the recess 33 radially outside.

Therefore, in order to easily detach the movement restricting member 24, as shown in FIGS. When the member 29 moves toward the second side X2 in the axial direction relative to the intermediate connection member 23 to the maximum minimum elongation state, the enlarged inner diameter portion 32 is not disposed radially outside the recess 33 of the pinion extension portion 27 .

Specifically, as shown in FIG. 3 , the ratio of the length B of the enlarged inner diameter portion 32 in the axial direction X to the ratio of the pinion gear member 29 to the intermediate connection structure in the state where the biasing pinion gear portion 30 is decomposed from the mobile body base portion 25 The movable width D that the member 23 can move toward the second axial side X2 is short. The movable range D is equal to the change range ( =A-C). In this embodiment, the fully compressed state of the elastic member 22 is the minimum stretched state.

On the other hand, as shown in FIG. 5 , in a state where the biasing pinion gear 30 is assembled on the side of the moving body base 25 , the moving body base 25 is configured so that the pair of pinion members 29 is aligned with respect to the intermediate connecting member 23 . Movement of the shaft on the second side X2 is restricted. That is, in the assembled state of the urging pinion portion 30 , the amount of movement of the pinion member 29 toward the second side X2 in the axial direction reaches the displaceability of the pinion member 29 in the disassembled state of the urging pinion portion 30 . Before the width D, the movement of the pinion member 29 is restricted by the moving body base portion 25 . Thus, in the assembled state of the urging pinion portion 30 , the movable width G of the pinion member 29 relative to the intermediate connection member 23 toward the second side X2 in the axial direction is larger than that in the disassembled state of the urging pinion portion 30 . The movable width D of the pinion member 29 is small.

Specifically, the moving body spline coupling portion 35 of the moving body base portion 25 is disposed on the second axial side X2 of the pinion extension portion 27, and the axial direction of the pinion extension portion 27 is fixed before the elastic member 22 is completely compressed. The end surface of the second side X2 abuts against the end surface of the moving body spline coupling portion 35 on the first side X1 in the axial direction to restrict the movement of the pinion gear member 29 . As shown in FIG. 5 , in the state of maximum extension, the axial width G between the end surface of the pinion extension part 27 on the second axial side X2 and the end surface of the moving body spline coupling part 35 on the axial first side X1 This becomes the movable width G of the pinion member 29 in the assembled state of the biasing pinion portion 30 .

In addition, the length B of the enlarged inner diameter portion 32 in the axial direction X is larger than that of the pinion member 29 relative to the intermediate connection member 23 in the state where the biasing pinion portion 30 is assembled to the mobile body base portion 25 . The movable width G until the movement of the axial second side X2 until the movement of the pinion gear member 29 is restricted by the moving body base portion 25 is long. According to this structure, after the urging pinion portion 30 is assembled to the mobile body base portion 25 , even if the elastic member 22 contracts, the pinion gear member 29 moves toward the axial second side X2 until the movement is restricted by the mobile body base portion 25 In this case, the enlarged inner diameter portion 32 is still arranged radially outside of the movement limiting member 24 . Thus, after assembling the biasing pinion portion 30 , regardless of whether the elastic member 22 expands or contracts, the state in which the enlarged inner diameter portion 32 is arranged on the radially outer side of the movement restricting member 24 can be maintained, and the movement restriction can be suppressed by the enlarged inner diameter portion 32 . The diameter of member 24 expands due to the centrifugal force of rotation. In addition, since the movement of the pinion gear member 29 toward the second axial side X2 can be restricted by the moving body base portion 25 , it is possible to suppress an increase in the number of members for restricting the movement.

As shown in FIG. 3 , the gap E in the radial direction between the inner peripheral surface of the enlarged inner diameter portion 32 and the portion on the second axial side X2 of the recess 33 on the outer peripheral surface of the pinion extension 27 is larger than that of the movement restricting member 24 in the radial direction. The upward thickness F is smaller. According to this structure, since the gap E between the enlarged inner diameter portion 32 and the pinion extension portion 27 at the second axial side X2 of the concave portion 33 is smaller than the thickness F of the movement restricting member 24, even when the movement restricting member 24 When pressed to the second axial side X2 by the movement limiting step surface 34 , the movement limiting member 24 can still be prevented from coming off from the concave portion 33 toward the second axial side X2 . The gap E is the difference in radius between the radius of the inner peripheral surface of the enlarged inner diameter portion 32 and the radius of the mountain portion of the spline groove 82 formed on the outer peripheral surface of the pinion extension portion 27 .

In addition, the present invention can freely combine the respective embodiments within the scope of the invention, or appropriately modify and omit the respective embodiments.

Industrial Applicability

The invention can be applied to a starting device of an internal combustion engine having a pinion moving in the axial direction.

Label description

1 Starter of internal combustion engine, 3 Electric motor, 4 Electric push-out mechanism, 7 Output shaft, 9 Ring gear of internal combustion engine, H Rotation axis, B Axial length of enlarged inner diameter part, D Movement of pinion member when disassembled Width, E Gap between enlarged inner diameter portion and pinion extension, G Movable width of pinion member when assembled, X axial direction, X1 axial first side, X2 axial second side, 11 One-way clutch inner wheel, 20 pinion moving body, 21 pinion, 22 elastic member, 23 intermediate connecting member, 24 movement limiting member, 25 moving body base, 27 pinion extension, 28 pinion tooth, 29 small Gear member, 30 energizing pinion, 31 one-way clutch, 32 enlarged inner diameter, 33 recess, 34 step surface (movement limiting step surface), 35 movable body spline joint, 36 clip of movable body base joint, 45 output shaft spline joint, 47 moving body support, 50 reducer (planetary gear mechanism), 74 connecting member, 80 connecting plate, 82 spline groove, 83 pinion stepped surface, 85 spline joint , 87 spring cover part.

Claims (3)

1. A starting device for an internal combustion engine, comprising: electric motor; an output shaft that transmits the rotational drive force of the electric motor; a pinion moving body having a moving body base part helically spline-coupled to the output shaft and connected to the moving body base via a one-way clutch, and the pinion is fixed to the pinion by an elastic member an urging pinion gear portion urging toward one side in the axial direction, that is, the first axial side; and An electric push-out mechanism, the electric push-out mechanism is engaged with the base part of the moving body, and when energized, the moving body of the pinion moves toward the first side of the axial direction, and when the power is not energized, the small gear the gear moving body moves toward an axial second side opposite to the axial first side, The starting device of the internal combustion engine is characterized in that the biasing pinion includes: a pinion member, which is a cylindrical member disposed radially outside the output shaft, has a pinion tooth portion on which the external teeth of the pinion gear are formed, and extends from the pinion tooth portion to the a pinion extension extending axially to the second side; an intermediate connecting member, which is a cylindrical member disposed radially outside the pinion gear member and constituting the inner wheel of the one-way clutch, having a spline connection with the pinion gear extension The spline joint part, and the enlarged inner diameter part extending from the spline joint part to the second axial side and having an inner diameter larger than the spline joint part; the elastic member urging the pinion member toward the axial first side with respect to the intermediate coupling member; and a movement restricting member, which is an annular member fitted into a concave portion formed on the outer peripheral surface of the pinion extension portion and extending in the circumferential direction, and arranged between the spline coupling portion whose inner diameter changes and the enlarged inner diameter portion. the axial second side of the stepped surface between them, restricting the movement of the pinion gear member relative to the intermediate coupling member to the axially first side by abutting against the stepped surface, In a state where the axial length ratio of the enlarged inner diameter portion separates the urging pinion portion from the mobile body base portion, the pinion member is second in the axial direction relative to the intermediate coupling member. The movable range that the side can move is short. 2. The starting device for an internal combustion engine according to claim 1, wherein: In the state where the biasing pinion gear portion is assembled to one side of the mobile body base portion, the pinion gear member is second in the axial direction relative to the intermediate connection member. lateral movement is restricted, The axial length ratio of the enlarged inner diameter portion is that the pinion member faces toward the second side in the axial direction with respect to the intermediate coupling member in a state where the biasing pinion gear portion is assembled to the mobile body base portion. The movable range that can move until the movement of the pinion gear member is restricted by the moving body base portion is long. 3. The starting device for an internal combustion engine according to claim 1 or 2, wherein: A radial gap between the inner peripheral surface of the enlarged inner diameter portion and the portion on the second axial side of the recess on the outer peripheral surface of the pinion extension portion is larger than the radial direction of the movement restricting member. The thickness should be small.