JPH0253627B2 - - Google Patents

Description

Detailed Description of the Invention A. Object of the Invention (1) Industrial Application Field The present invention provides an actuating unit in which a pinion that can mesh with a ring gear of an engine is built into a pinion case, and a drive unit that transmits driving force to the pinion. The present invention relates to an engine starting device in which a starting motor for starting a motor and an electromagnetic switch unit controlling the operation of the pinion and the starting motor are integrally connected, and the operating unit is connected to an engine body.

(2) Prior Art Conventionally, when assembling such a starter device, an actuating unit, a starting motor, and an electromagnetic switch unit are connected to each other by bolts, but the direction in which the bolts are tightened is inconsistent.

(3) Problems to be solved by the invention If the bolt tightening direction is inconsistent as in the past, the assembly posture must be changed each time, making the work complicated. Particularly when automatic assembly is performed using a robot or the like, such a change in posture is not desirable.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an engine starting device in which the bolt tightening direction is constant and the assembly work is simplified.

B. Structure of the Invention (1) Means for Solving the Problems According to the present invention, the pinion case has a flat flange joint surface for coupling to the engine body, a starter motor case, and an electromagnetic switch unit case. A joint surface parallel to the flange joint surface is provided for joining the pinion case, the pinion case is connected to the engine body by bolts perpendicular to the flange joint surface, and the starter motor case and the electromagnetic switch unit case are connected to the flange joint surface. It is connected to the pinion case by threading and tightening another bolt in the same direction as the bolt.

(2) Effect The mounting direction of the operating unit on the engine body,
The mounting direction of the starting motor and the electromagnetic switch unit to the operating unit is the same because the flange joint surface of the pinion case and the joint surface are parallel, and the direction in which each bolt is tightened is also the same. Assembly work is simplified.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 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 a clutch case 21 is slidably fitted onto the pinion drive shaft 18 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. Moreover, 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.

A 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 a screw hole 52 for the bolt 44 is provided in the boss portion 48. Moreover, each screw hole 49, 51,
52 are provided perpendicularly to the boss portions 45, 46, 47, and 48 and parallel to each other.

In the case 19 of the starting motor 2 which is connected to the pinion case 5 by the bolts 43 and the 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 flange 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 flange portion 20b is held between the step portion 34 and the protrusion 54, the inclined surface 56, the protrusion 54, and the inner surface of the enlarged diameter portion 35 form an annular shape with a right triangular cross section for accommodating the seal member 55. A storage chamber 72 is formed. This prevents excessive force from being applied to the seal 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 insert the sealing member 57, the stator 41 has an annular stepped surface 58 facing the front bracket 39 at the end thereof, and an annular stepped surface 58 that protrudes toward the front bracket 39 from the inner peripheral edge of the stepped surface 58. Bracket 3
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.

Further, with the electromagnetic switch unit 13 coupled to the pinion case 5, the forward protruding shaft 30a of the movable core 30 in the electromagnetic switch unit 3 projects into the shift lever drive chamber 9 to be connected to the shift lever 25. Moreover, the movable iron core 30 and the forward protruding shaft 30a are operated to be attracted into the switch case 31 by the excitation of the solenoid 64.
As a result, the shift lever 25 rotates counterclockwise in FIG. 1 against the spring force of the spring 32, and the pinion 7 moves forward to mesh with 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 starter, as shown in FIG. 5, the assembly jig 67 is fixed with the hole 68 vertical, and
The pinion case 5 is placed on the assembly jig 67 so that the fitting protrusion 11 is inserted into the assembly jig 68 . 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 inserting the seal member 57 between them, and connecting the front bracket 39 to the pinion case 5 with bolts 43. By screwing the through bolts 42 into the pinion case 5, the 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 automatic assembly using a robot or the like can be easily applied.

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.

C. Effects of the Invention As described above, according to the present invention, the pinion case has a flat flange joining surface for joining to the engine body, and the flange for joining the starting motor case and the electromagnetic switch unit case. The pinion case is connected to the engine body by a bolt perpendicular to the flange joint surface, and the starting motor case and the electromagnetic switch unit case are connected in the same direction as the screw direction of the bolt. Since it is connected to the pinion case by screwing and tightening other bolts from the same direction, the assembly direction can be unified and assembly work can be facilitated, and therefore automatic assembly is also possible.
Furthermore, each part can be attached and detached while the starter is still attached to the engine body, making maintenance easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall longitudinal 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. DESCRIPTION OF SYMBOLS 1... Actuation unit, 2... Starting motor, 3... Electromagnetic switch unit, 4... Engine body, 5... Pinion case, 14... Flange joint surface, 17, 4
3,44...Bolt, 19,31...Case, 33,
36...Joint surface, 42...Through bolt.

Claims (1)

[Claims] 1. An actuation unit comprising a pinion built in a pinion case that can mesh with a ring gear of an engine, a starting motor for transmitting driving force to the pinion, and an electromagnetic switch unit that controls the operation of the pinion and the starting motor. In the engine starting device, the pinion case has a flat flange joining surface for joining to the engine body, and the flange for joining the starting motor case and the electromagnetic switch unit case. The pinion case is connected to the engine body by a bolt perpendicular to the flange joint surface, and the starting motor case and the electromagnetic switch unit case are connected in the same direction as the screw direction of the bolt. An engine starting device characterized in that it is coupled to a pinion case by threading and tightening another bolt from the same direction.