JPH0241347Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Application Field In the present invention, one end of the pinion drive shaft that can mesh with the ring gear of the engine is rotatably supported by the pinion case, and the pinion drive shaft is substantially supported by the pinion case. A holding member integrated with the pinion drive shaft rotatably supports a portion near the other end of the pinion drive shaft, and a case of a starter motor connected to the other end of the pinion drive shaft is provided with an annular seal between the holding member and the holding member. The present invention relates to an engine starting device that is bolted to a pinion case via a member.

(2) Prior Art Conventionally, in such a starter device, a holding member is bolted to a pinion case.

(3) Problems to be solved by the invention However, with the above-mentioned conventional method, in addition to bolts for joining the starter motor case to the pinion case, bolts are required for joining the holding member to the pinion case. However, the number of parts increases and the installation work becomes complicated.

The present invention was devised in view of the above circumstances, and is an engine starting device that reduces the number of parts and simplifies the installation work by sandwiching the holding member between the pinion case and the starting motor case. The purpose is to provide

B. Structure of the invention (1) Means for solving the problems According to the invention, the starting motor side end of the pinion case has an enlarged diameter portion into which the holding member can be fitted, and a stepped portion that receives the holding member. The case of the starter motor is provided with a projecting part that fits into the enlarged diameter part and holds the holding member between the stepped part and the outside of at least one of the holding member and the projecting part. The periphery is inclined so as to move away from the other toward the outside so as to cooperate with either the other and the inner surface of the enlarged diameter portion to define an annular storage chamber having a triangular cross section that can accommodate the sealing member. An inclined surface is provided all around the circumference.

(2) Effect The holding member is held between the starter motor case and the pinion case, and there is no need for a bolt to substantially integrate the holding member with the pinion case. Moreover, it is possible to avoid applying an excessive load to the sealing member while the case of the starting motor is in contact with the holding member.

(3) Embodiment Below, an embodiment of the present invention will be explained with reference to the drawings. First, in FIG. 1, this starting device is for a diesel engine such as a truck or a bus. The motor 2 and the electromagnetic actuating unit 3 are integrally bolted together, and then bolted to the engine body 4.

The actuating unit 1 has a pinion 7 built into the pinion case 5, which is movable between a position where the pinion 7 engages with the ring gear 6 for starting the engine and a position where the engagement is released. It consists of being done.

Referring also to FIG. 2, pinion case 5
A pinion operating chamber 8 with a circular cross section, a shift lever drive chamber 9 with a circular cross section parallel to the pinion operating chamber 8, and a sliding chamber 10 formed with a circular cross section between the two chambers 8 and 9. It is formed to be open on the side opposite to the engine main body 4. Moreover, a fitting protrusion 11 that defines a part of the pinion working chamber 8 is provided in a protruding manner on the pinion case 5, and a fitting protrusion 11 for fitting the fitting protrusion 11 is provided on the outer surface of the engine body 4. A recess 12 is provided. Further, the fitting protrusion 11 is provided with an opening 11a, and the ring gear 6 is thrust into the pinion operating chamber 8 through the opening 11a.

A flange portion 13 extending outward at the base of the fitting protrusion 11 is integrally provided on the pinion case 5, and this flange portion 13 has a flat flange joint surface 14 for joining to the engine body 4. provided. In addition, a plurality of insertion holes 15 are bored in the flange portion 13 at positions outward from the sealing member 71 interposed between it and the engine main body 4, and the engine main body 4 corresponds to these insertion holes 15. A screw hole 16 is provided. Therefore, the seal member 71
The pinion case 5 is coupled to the engine body 4 by screwing and tightening the bolts 17 inserted into the respective insertion holes 15 into the screw holes 16 while the flange joint surface 14 is brought into contact with the engine body 4 through the bolts. Ru.

A pinion drive shaft 18 parallel to the axis of the ring gear 6 is rotatably arranged concentrically in the pinion working chamber 8 . That is, one end of the pinion drive shaft 18 is rotatably supported at the tip of the fitting protrusion 11, and the other end of the pinion drive shaft 18 is held between the pinion case 5 and the case 19 of the starting motor 2. It is rotatably supported by a holding member 20.

The pinion 7 is rotatably and slidably fitted onto the pinion drive shaft 18, and the clutch case 21 is also slidably fitted via a spline 22. Furthermore, an overrunning clutch 23 connecting the clutch case 21 and the pinion 7 is housed within the clutch case 21. This overrunning clutch 23 has a pinion 7
When an overload is applied to the pinion drive shaft 18
and the power transmission between the pinion 7 and the pinion 7 are cut off.

Further, a stopper 24 is attached to the pinion drive shaft 18 closer to the tip of the fitting protrusion 11 than the ring gear 6, and when the pinion 7 moves on the pinion drive shaft 18 until it comes into contact with the stopper 24, , the pinion 7 meshes with the ring gear 6.

Pinion operating chamber 8 and shift lever driving chamber 9
A shift lever 25 is arranged across the sliding chamber 10. The intermediate portion of the shift lever 25 is connected to a synthetic resin holder 26 slidably fitted in the sliding chamber 10 via a support shaft 27 perpendicular to the axis of the pinion drive shaft 18 . Moreover, sliding chamber 1
Collar 28 and holder 2 fitted on the open end side of 0
A spring 29 is interposed between the holder 26 and the holder 6, and the holder 26 is urged rightward by the spring force of the spring 29.

One end of the shift lever 25 is connected to the pinion operating chamber 8.
The clutch case 21 is branched into two parts so as to sandwich the clutch case 21 from both sides, and is connected to the clutch case 21 with a pin. On the other hand, in the shift lever drive chamber 9, the other end of the shift lever 25 has a forward protruding shaft 3 of a movable iron core 30 in the electromagnetic switch unit 3.
0a is concatenated. Furthermore, a spring 32 is provided between the other end of the shift lever 25 and the case 31 of the electromagnetic switch unit 3 to bias the shift lever 25 clockwise in FIG.

Paying particular attention to FIG. 2, the open end surface of the pinion case 5 has a joint surface 3 parallel to the flange joint surface 14 so as to surround the pinion operating chamber 8.
3 is provided. Further, an enlarged diameter portion 35 is provided at the open end of the pinion operating chamber 8 via a stepped portion 34 facing outward.
is provided. Furthermore, a joint surface 36 surrounding the shift lever operating chamber 9 is provided on the open end surface of the pinion case 5 so as to be flush with the joint surface 33 , and the end portion 3
4 through the stepped portion 37 located deeper than the enlarged diameter portion 38.
is provided.

The case 19 of the starting motor 2 is formed by sandwiching a stator 41 between a front bracket 39 and a rear bracket 40.
1 is a pair of through bolts 4 spaced apart in the circumferential direction.
2 and pinion case 5.
Moreover, the front bracket 39 is also connected to the pinion case 5 by a single bolt 43. Furthermore, the case 31 of the electromagnetic switch unit 3 has a pair of bolts 44 spaced apart in the circumferential direction.
It is connected to the pinion case 5 by.

In order to screw these bolts 42, 43, 44 together, the open end of the pinion case 5 has boss parts 45, 46 that are flush with the joint surface 33, and boss parts 45, 46 that are flush with the joint surfaces 33, 36. A boss portion 47 continuous to the joint surface 36 and a boss portion 48 continuous to the joint surface 36 are integrally provided so as to protrude outward. Boss parts 45, 47
are provided with screw holes 49, 49 into which the through bolts 42 are screwed, respectively, and a screw hole 51 into which the bolts 43 are screwed is provided in the boss portion 46. Further, the boss portion 47 is provided with the through bolt 42.
A screw hole 5 for screwing the bolt 44 of the electromagnetic switch unit 3 is provided in a position close to the screw hole 49 for the electromagnetic switch unit 3.
2 is provided, and the boss portion 48 is also provided with a screw hole 52 for the bolt 44. Moreover, each screw hole 49, 5
1 and 52 are provided perpendicularly to the boss portions 45, 46, 47, and 48 and parallel to each other.

In the case 19 of the starter motor 2 which is connected to the pinion case 5 by bolts 43 and through bolts 42, the front bracket 39 has a joint surface 5 opposite to the joint surface 33 at the end on the pinion case 5 side.
3, and a cylindrical protrusion 54 that protrudes from the inner edge of the joint surface 53 and fits into the enlarged diameter portion 35.
A holding member 20 is held between the protrusion 54 and the pinion case 5.

That is, the holding member 20 holds the pinion drive shaft 1
a cylindrical bearing part 20a for supporting the bearing part 8; and a collar part 20 extending radially outward from the bearing part 20a.
b are integrally formed, and the collar portion 20b is sandwiched between the protrusion 54 and the stepped portion 34.

In FIG. 3, in order to prevent lubricating oil from leaking between the pinion working chamber 8 and the starting motor 2,
An annular seal member 55 is interposed between the flange 20b and the protrusion 54 of the holding member 20. For this reason, on the outer peripheral edge of the end surface of the flange 20b on the side of the protrusion 54, an inclined surface 56 that is inclined in a direction away from the protrusion 54 toward the outside is provided over the entire circumference.
When the collar portion 20b is held between the step portion 34 and the protrusion 54, the inclined surface 56, the protrusion 54 and the enlarged diameter portion 3
5 inner surface forms an annular storage chamber 72 having a right triangular cross section for accommodating the sealing member 55 . This prevents excessive force from being applied to the sealing member 55 due to tolerances such as the amount of protrusion of the protrusion 54 and the thickness of the flange 20b.

Further, in the case 19 of the starting motor 2, an annular seal member 57 is also interposed between the stator 41 and the front bracket 39, as shown in FIG. In order to sandwich the sealing member 57, the stator 41 has an annular step surface 58 facing the front bracket 39 at the end thereof, and an annular step surface 58 that protrudes toward the front bracket 39 from the inner peripheral edge of the step surface 58.
At the end of the front bracket 39, a tapered surface 60 that is inclined toward the stator 41 as it goes outward is opposed to the stepped surface 58. provided.

The seal member 57 is sandwiched between the step surface 58 and the tapered surface 60, and the tapered surface 60 prevents the seal member 57 from falling off outward. With this structure, after the stator 41 and the front bracket 39 are cast, the seal member 57 can be held in the as-cast state without any special processing on the ends of the stator 41 and the front bracket 39. It becomes possible. Further, a sealing member is similarly interposed between the stator 41 and the rear bracket 40.

With the starting motor 2 connected to the pinion case 5, the external gear 62 provided at the end of the rotor shaft 61 of the starting motor 2 meshes with the internal gear 63 provided at the end of the pinion drive shaft 18, Thereby, the driving force of the starting motor 2 is transmitted to the pinion drive shaft 18.

In addition, with the electromagnetic switch unit 3 coupled to the pinion case 5, the electromagnetic switch unit 3
The forward protruding shaft 30a of the movable iron core 30 is connected to the shift lever drive chamber 9 to be connected to the shift lever 25.
rush inside. Moreover, the movable iron core 30 and the forward protruding shaft 30a are attracted into the switch case 31 by the excitation of the solenoid 64, and as a result, the shift lever 25 is moved in the opposite direction in FIG. 1 against the spring force of the spring 32. The pinion 7 rotates clockwise and moves forward to engage the ring gear 6.

Furthermore, the electromagnetic switch unit 3 has a built-in switch mechanism (not shown) that establishes conduction between the battery terminal 65 and the starting motor 2 in response to the suction operation of the movable iron core 30. The starting motor 2 is energized by the conduction of the mechanism, and the external gear 62 and the internal gear 63 are activated.
The driving force reduced in speed is transmitted from the rotor shaft 61 to the pinion drive shaft 18.

A part of the case 19 of the starting motor 2 and a part of the case 31 of the electromagnetic switch unit 3 are located at a portion of the pinion case 5 corresponding to the open end of the sliding chamber 10, and both cases 19, 3
1, the sliding chamber 1 is pressed against the stepped portion 37.
A disk-shaped sealing member 66 integrally connected to the annular sealing member 55 is fitted into the enlarged portion 38 of 0. This sealing member 66 allows the collar 28
is supported.

In FIG. 5, an assembly jig 67 is prepared for assembling the starter. This assembly jig 6
7 has a hole 68 in the center into which the fitting protrusion 11 of the pinion case 5 can be fitted, and is formed corresponding to the flange part 13, and has a pin 6 for positioning.
9 is provided protrudingly. On the other hand, a positioning hole 70 for fitting the pin 69 is formed in the flange joint surface 14 of the pinion case 5 at a position outward from the seal member 71.

Next, the operation of this embodiment will be explained. When assembling the starting device, as shown in FIG. The pinion case 5 is placed on the assembly jig 67 so that the portion 11 is fitted. At this time, the pinion case 5 is positioned by fitting the pin 69 into the positioning hole 70.

In this state, the pinion 7 is inside the pinion case 5.
The starting motor 2 and the electromagnetic switch unit 3 are further connected to the pinion case 5. At this time, the case 19 of the starting motor 2 is assembled by sequentially assembling the front bracket 39, stator 41, and rear bracket 40 while interposing the seal member 57 between them, and connecting the front bracket 39 to the pinion case 5 with bolts 43, and then inserting them through the bolts. By screwing bolts 42 into pinion case 5, front bracket 39, stator 41, and rear bracket 40 are integrated. Further, the case 31 of the electromagnetic switch unit 3 is coupled to the pinion case 5 with bolts 44.

During such assembling, the assembling direction is all unified from the top to the bottom, and can be easily applied to automatic assembly using a robot or the like.

After the assembly is completed, the starter is coupled to the engine body 4 with bolts 17.

When the engine is started, the solenoid 64 is energized, the shift lever 25 rotates counterclockwise in FIG. Furthermore, the starting motor 2 starts operating with a slight delay, driving force is transmitted from the pinion 7 to the ring gear 6, and the engine is started.

In the above embodiment, the inclined surface 56 is provided on the holding member 20.
However, an inclined surface 56 may be provided on the outer peripheral edge of the protrusion 54 in the case 19 of the starting motor 2. Further, the inclined surface 56 may be provided on both the holding member 20 and the protrusion 54.

C. Effects of the invention As described above, according to the invention, the starting motor side end of the pinion case is provided with an enlarged diameter portion into which the holding member can be fitted, and a stepped portion that receives the holding member.
The case of the starter motor is provided with a protruding part that fits into the enlarged diameter part and holds the holding member between it and the stepped part, and the outer peripheral edge of at least one of the holding member and the protruding part is provided with a protrusion. In order to cooperate with the other side and the inner surface of the enlarged diameter part to define an annular storage chamber having a triangular cross section in which the sealing member can be accommodated, an inclined surface that slopes away from the other side toward the outside is provided all around the circumference. Since the holding member is provided over the entire length of the starting motor case, the holding member is held between the protrusion on the starter motor case and the stepped portion of the pinion case, eliminating the need for bolts to substantially integrate the holding member into the pinion case, and reducing the number of parts. reduction is possible. Further, in the sandwiched state, the sealing member can come into contact with the protrusion, the inclined surface, and the inner surface of the enlarged diameter portion to achieve sufficient sealing. Moreover, even if the protrusion comes into contact with the holding member, excessive load is not applied to the sealing member.
Deformation of the seal member is prevented.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall vertical sectional side view, and FIG.
3 is an enlarged view of the portion of FIG. 1, FIG. 4 is an enlarged sectional view of the portion of FIG. 1, and FIG. 5 is a longitudinal sectional view of the assembly jig. 2... Starting motor, 5... Pinion case, 6
...Ring gear, 7 ... Pinion, 18 ... Pinion drive shaft, 19 ... Case, 20 ... Holding member, 34 ... Step part, 35 ... Expanded diameter part, 54 ... Projection, 55 ... Seal Member, 56... Inclined surface, 72
...A circular containment chamber.

Claims (1)

[Scope of utility model registration request] One end of the pinion drive shaft that drives a pinion that can mesh with the ring gear of the engine is rotatably supported by a pinion case, and a holding member that is substantially integrated with the pinion case holds a portion near the other end of the pinion drive shaft. In the engine starting device, the case of a starter motor that is rotatably supported and connected to the other end of the pinion drive shaft is bolted to the pinion case with an annular seal member interposed between the case and the holding member. The starting motor side end of the pinion case is provided with an enlarged diameter part into which the holding member can be fitted, and a stepped part that receives the holding member. A protrusion that holds the holding member between the holding member and the protrusion is provided on the outer peripheral edge of at least one of the holding member and the protrusion. An engine starting device characterized in that an inclined surface is provided around the entire circumference of the engine so as to be inclined away from the other side toward the outside so as to define an annular storage chamber having a triangular cross section.