JPH0241346Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The invention consists of an actuating unit in which a pinion that can mesh with the ring gear of an engine is built into a pinion case, a stator and brackets on both sides of the actuating unit. An engine comprising a case integrally connected by a through bolt, and a starting motor for driving the pinion and an electromagnetic switch unit controlling the operation of the pinion and the starting motor. Relating to a starting device.

(2) Conventional technology Conventionally, when assembling such a starter device, the actuating unit, starting motor, and electromagnetic switch unit are bolted to each other, 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 performing automatic assembly using a robot or the like, such attitude changes are not desirable.

The present invention was developed in view of the above circumstances, and it unifies the bolt tightening direction when connecting the starting motor and the electromagnetic switch unit to the operating unit, and also provides a boss section for screwing the bolts. An object of the present invention is to provide an engine starting device in which at least a portion of the engine starting device is made common.

B. Structure of the invention (1) Means for solving the problem According to the invention, the pinion case has a bolt for connecting the electromagnetic switch unit to the pinion case and a through bolt that are tightened in the same direction. A boss portion is provided in which screw holes for screwing are arranged close to each other.

(2) Effect The bolt for connecting the electromagnetic switch unit and the through bolt of the starting motor are screwed into the screw hole in the boss part with their tightening directions aligned.
The assembly work is simplified, and the boss portion can be made common.

(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.
will be 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 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 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 has a stepped surface and a tapered surface 60.
The tapered surface 60 prevents the sealing member 57 from falling off. With such a structure, after the stator 41 and the front bracket 39 are formed by casting, the stator 41
Moreover, it is possible to hold the seal member 57 in an as-cast state without performing any special processing on the end of the front bracket 39. 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.

C. Effects of the invention As described above, according to the invention, the pinion case has a bolt for connecting the electromagnetic switch unit to the pinion case and a through bolt for screwing together in the same tightening direction. Since the boss part with the screw holes arranged close to each other is provided, the direction of assembly of the electromagnetic switch unit and the starter motor to the actuating unit can be the same, simplifying the assembly work, and the boss part can be installed at least in the same direction. It is possible to share parts and make the whole compact.

[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. 1... Actuation unit, 2... Starting motor, 3...
...Electromagnetic switch unit, 5...Pinion case, 6...Ring gear, 7...Pinion, 19...
...Case, 39, 40...Bracket, 41...
Stator, 42...Through bolt, 44...Bolt, 47...Boss portion, 49, 52...Threaded hole.

Claims (1)

[Scope of utility model registration request] A starter motor for driving the pinion, which has an actuating unit in which a pinion that can mesh with the ring gear of the engine is built into a pinion case, and a case in which a stator and brackets on both sides of the stator are integrally connected by through bolts. and,
An engine starting device in which an electromagnetic switch unit that controls the operation of the pinion and the starting motor are integrally coupled, wherein the pinion case includes a bolt for coupling the electromagnetic switch unit to the pinion case; An engine starting device characterized in that a boss portion is provided with screw holes arranged close to each other for screwing together the through bolt in the same tightening direction.