JPS6228311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a starting motor device, in particular, a starting motor is attached to one side of a transmission housing, an output shaft is rotatably supported on the transmission housing, and a rotor shaft of the starting motor is connected to the output shaft. The pinion gear connected to the output end of the output shaft is interlocked with the electromagnetic switch for starting the starting motor via the pinion moving device, and the electromagnetic Regarding a device in which the pinion gear is moved to a meshing position with a driven gear such as a ring gear of an engine when the switch is operated, when the electromagnetic switch is operated, the pinion gear and its driven gear are moved without applying a large impact force to the pinion gear and its driven gear. It is an object of the present invention to provide a starter motor device that can be quickly engaged, has good assembly efficiency, and has high durability.

In order to achieve the above object, the present invention includes a starting motor attached to one side of a transmission housing, an output shaft rotatably supported on the transmission housing, and a connection between the rotor shaft of the starting motor and the output shaft. A pinion gear connected to the output end of the output shaft is interlocked with an electromagnetic switch for starting the starter motor via a pinion moving device, and the electromagnetic switch is actuated. When the pinion gear is moved to a meshing position with a driven gear such as a ring gear, the movable member is connected to the pinion gear so as to be able to move the pinion gear and is disposed parallel to the operating rod of the electromagnetic switch. a shift lever that is pivotally supported by the transmission housing via a pivot pin and connected to the moving rod; the lever and the operating rod are connected so as to be able to apply an operating torque to the shift lever; The pinion moving device is constituted by a torsion coil type overload spring that undergoes elastic deformation when subjected to a torsional torque exceeding a value, and the overload spring includes a coil portion that is loosely inserted into the pivot pin, and a coil portion that extends from the coil portion. The shift lever includes a first locking arm that extends and engages the shift lever, and a second locking arm that similarly extends from the coil portion and engages the operating rod, and the shift lever is provided with the overload spring. The spring is characterized in that first and second spring bearing surfaces are formed to support the outer periphery of the coil portion and the second locking arm of the spring, respectively, so that the spring can be held independently with a predetermined torsional torque applied thereto.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. A starting motor M and an electromagnetic switch S for starting it are mounted in parallel to each other as follows.

That is, the stator 3 of the starting motor M and the rear bearing bracket 4 are sequentially stacked on the rear surface of the rear housing 2, and are fixed to the front housing 1 together with the rear housing 2 by bolts 5. A rotor shaft 6 of the starting motor M is supported by the rear housing 2 and the bearing bracket 4 via a ball bearing 7 and a bearing bush 8, respectively, and the output end, that is, the front end of the rotor shaft 6 protrudes into the transmission housing H. are doing.

In the electromagnetic switch S, a switch cylinder 10 holding a solenoid 9 is fixed to the rear housing 2 with screws 11. Inside the solenoid 9, a fixed iron core 13 connected to the switch tube 10 via a yoke 12 and a movable iron core 14 that moves forward and backward with respect to the front surface of the fixed iron core 13 are arranged. A return spring 15 is provided to bias the return spring 14 in a direction away from the front surface of the fixed iron core 13. The movable core 14 is integrally formed with a switch operating rod 16 that penetrates the fixed core 13, and a movable contact 17 is slidably attached to the tip of the switch operating rod 16. The switch actuating rod 16 is held at the tip position by the resilient force. At the rear end of the switch tube 10 is a terminal cap 1 made of insulating material.
A pair of terminal bolts 20 passing through the end wall of the cap 19 are fixed to the cap 19, and the movable contact 1 is attached to the inner end of the bolts 20.
A pair of fixed contacts 21 facing 7 are formed. Of the pair of terminal bolts 20, one is connected to a conductive wire connected to a power source, and the other is connected to a conductive wire connected to a starting motor M (both not shown).

Furthermore, an operating rod 22 with a hook 22a that protrudes into the transmission housing H is also integrally formed on the movable iron core 14.

The transmission housing H includes a rotor shaft 6 and an output shaft 2 parallel to the operating rod 22 at an intermediate position thereof.
3, and a one-way transmission T that transmits driving force in one direction from the rotor shaft 6 to its output shaft 23, and the output shaft 23 is provided with ball bearings 24, 25 in the front and rear housings 1, 2, respectively. The shaft is rotatably supported through the shaft and cannot be moved in the axial direction.

The one-way transmission T includes a small-diameter drive gear 26 formed at the output end of the rotor shaft 6, and a large-diameter driven gear 2 that meshes with the drive gear 26 concentrically with the output shaft 23.
7 and a one-way clutch C interposed between the driven gear 27 and the output shaft 23, and the one-way clutch C is integrally provided with the driven gear 27 on its outer periphery and has a pair of bearing bushes 28. ,29
A clutch outer 30 is rotatably supported on the output shaft 23 via a clutch outer 30, a clutch inner 31 is integrally formed on the outer periphery of the output shaft 23 and disposed inside the clutch outer 30, and a Wedge roller 32 interposed in
It consists of Therefore, one-way clutch C
As usual, from the clutch outer 30, that is, the driven gear 27, to the clutch inner 31, that is, the output shaft 23,
It has a one-way transmission function that transmits torque to, but blocks the transmission of reverse loads.

The output end of the output shaft 23 protrudes from the front surface of the front housing 1, and a cylindrical boss 33a of a pinion gear 33 is fitted to the outer periphery of the output end via a spline 34 so as to be slidable back and forth. This pinion gear 3
At a predetermined forward position of No. 3, a ring gear 35 of the engine that meshes with it is kept waiting.

The output end of the output shaft 23 extends forward beyond the axial center line L of the ring gear 35, so that when the pinion gear 33 drives the ring gear 35, the drive reaction force prevents the pinion gear 33 from tilting, and The gears 33 and 35 are maintained in a proper meshing state.

The open front surface of the cylindrical boss 33a of the pinion gear 33 is closed by a dustproof plate 37 which is caulked and fixed thereto, thereby preventing dust and the like from entering into the interior of the boss 33a.

The pinion gear 33 is moved to a position where it meshes with the ring gear 35 when the electromagnetic switch S is operated, and a pinion moving device D for this purpose is provided in the transmission housing H as follows.

The pinion moving device D has a moving rod 38 that slides through the axial center of the output shaft 23, and the front end of the moving rod 38 has a dustproof plate 37 of the cylindrical boss 33a and a dustproof plate 37 of the cylindrical boss 33a. A retaining ring 3 secured to the inner wall of
Pressing flange 38a that can move forward and backward between
is formed, and a barrel-shaped buffer coil spring 39 is compressed between the flange 38a and the dustproof plate 37.

The rear part of the hollow part of the output shaft 23 is enlarged to form a guide hole 40, and a spring receiver 41 that slides into the guide hole 40 is fixed onto the moving rod 38 with a stop ring 42.
A return coil spring 43 that biases the moving rod 38 in the backward direction is compressed into the guide hole 40 via a flange 41a formed on the outer periphery of the rear end of the spring receiver 41.

As shown in FIG. 2, a cutout 44 is provided on the outer circumferential surface of the flange 41a of the spring receiving sleeve 41, and this serves as a ventilation hole that communicates the guide hole 40 with the inside of the transmission housing H. Therefore, the spring receiver 41 can slide in the guide hole 40 without being resisted by the air inside.

In addition, as shown in FIG. 4, the pinion moving device D includes a lever holder 45 fixed to the transmission housing H, a shift lever 47 pivotally supported by the lever holder 45 via a pivot pin 46, and an actuator operated by the shift lever 47. The lever 4 can be used to apply torque.
7 and the operating rod 22 of the electromagnetic switch S, and an overload spring 48 is formed by a torsion coil spring that undergoes elastic deformation when subjected to torsion torque exceeding a predetermined value.
and has. The shift lever 47 includes a first arm 47a that engages with the rear end of the moving rod 38, and a pair of pin holes 47d that support both ends of the pivot pin 46.
A bifurcated second arm 4 extending in the opposite direction with the
7b, and a bridging portion 47c that connects the two prongs near the pin hole 47d, and the bridging portion 4
7c is the first spring bearing surface f ₁ of the present invention, and the rear surface of the second arm 47b is the second spring bearing surface f ₂ of the present invention.
Configure each. The overload spring 48 also includes a coil portion 48c that is loosely inserted into the pivot pin 46 in a non-contact state, and first and second locking arms 48a and 48b that extend in opposite directions from the coil portion 48c. The stop arm 48a is locked to the rear surface of the first arm 47a. Therefore, when connecting the shift lever 47 and the overload spring 48, the overload spring 48
The outer periphery of the coil portion 48c is supported on the front surface of the bridge portion 47c, that is, the first spring bearing surface _f1 , and the coil portion 48
While applying a predetermined torsional torque as a set load to c, the first locking arm 48a is locked to the rear surface of the first arm 47a, and the second locking arm 48b is connected to the two-pronged second arm 4.
7b, i.e., the second spring bearing surface _f2 , in a bridging manner. The coil portion 48c is arranged coaxially with the pair of pin holes 47d of the shift lever 47 so as not to obstruct insertion of the pivot pin 46.

The lever holder 45 has a pair of arm portions 45a and 45b that sandwich the shift lever 47, and a pin hole 45 that supports both ends of the pivot pin 46 in these arm portions.
c, 45d are drilled. One pin hole 45c is formed to have approximately the same diameter as the pivot pin 46, and the other pin hole 45d is formed to have a smaller diameter than the pivot pin 46, so that when the pivot pin 46 is inserted into one pin hole 45c, the other pin hole 45c is formed to have a smaller diameter than the pivot pin 46. The pivot pin 46 does not come out of the pin hole 45d, and after insertion, the pivot pin 46 does not easily come out due to frictional resistance with the inner surface of the pin hole 45c.
Incidentally, the peripheral edges of both ends of the pivot pin 46 have tapered portions 46a to facilitate insertion into each pin hole.
is formed.

Thus, the shift lever 47 and the overload spring 4
8. Since the lever holder 45 and the pivot pin 46 constitute one set of assembly, the transmission housing H
It can be easily installed.

When assembling the above assembly, in particular, the shift lever 47 and overload spring 48 can be pre-assembled in advance with only these two members and with a regular set load applied to the spring 48. , the pivot pin 46 has an overload spring 4 attached thereto.
The shift lever 47 can be inserted and inserted easily without applying any strong spring force.

The assembly is housed in the housing hole 2b of the rear housing 2, as shown in FIG.
The inner wall of b reliably prevents the pivot pin 46 from being pulled out. Further, the lever holder 45 is fixed by the switch cylinder 10 when the electromagnetic switch S is attached to the rear housing 2.

The hook 22a of the operating rod 22 is lockingly connected to the second locking arm 48b of the overload spring 48. In the above, the effective length of the second locking arm 48b of the spring 48 is shorter than that of the first arm 47a of the lever 47. Therefore, depending on the ratio of their arm lengths, the operating rod 22
can be transmitted to the moving rod 38 at increased speed.

The pinion gear 33, moving rod 38, and shift lever 47 move backward due to the spring action of the return spring 43, when the back of the first arm 47a of the shift lever 47 stops at a stopper portion 2a formed on the inner wall of the rear housing 2.
It is regulated by coming into contact with.

A ring gear 35 is installed at the front end of the transmission housing H.
A pinion housing 49 that receives the rear half of the pinion gear 33 that is further retreated is connected to the pinion housing 49, and an inlet 49a of the pinion housing 49 is widened outward to guide the storage of the pinion gear 33 into the pinion housing 49. It's getting old. Rainwater, washing water, etc. that have entered the inlet 49a are guided by the tapered surface of the inlet 49a and are quickly discharged outward from the bottom.

The pinion housing 49 also has an inlet 4
Below 9a, there is a drainage hole 50 that communicates the inside with the outside, and this drainage hole 50 has a downward slope toward the outlet. Therefore, even if water should intrude into the pinion housing 49, it can be drained immediately through the drainage hole 50.

On the other hand, a closing wall 33b is formed at the rear end of the pinion gear 33 to integrally connect the teeth thereof, and this closing wall 33b prevents water from entering the pinion housing 49 through the teeth of the pinion gear 33. It also serves to reinforce the teeth of the pinion gear 33.

Next, the operation of this embodiment will be explained. If the engine start switch is operated to energize the solenoid 9 of the electromagnetic switch S, the movable iron core 14 will be drawn to the fixed iron core 13, and the operating rod 22 will be drawn toward the fixed iron core 13.
rotates the shift lever 47 counterclockwise in FIG. 1 around the pivot pin 46 via the overload spring 48, and pushes the moving rod 38 forward (to the left in FIG. 1) with its first arm 47a. move. This moving rod 38
, the pressing flange 38a moves the pinion gear 33 to the ring gear 35 via the buffer spring 39.
advance to the meshing position. At this time, if the tooth traces of both gears 33 and 35 do not match and their tooth side surfaces collide, the moving rod 38 leaves the pinion gear 33 at the collision position and moves the buffer spring 3
The movable core 14 moves forward to the contact position with the dustproof plate 37 while compressing the overload spring 48, and then moves back to the position where it comes into close contact with the fixed core 13 while twisting the overload spring 48, causing elastic deformation of both springs 39 and 48. This absorbs the shock caused by the collision between both gears 33 and 35.

On the other hand, the movable contacts 17 contact the pair of fixed contacts 21 almost at the same time as the movable core 14 is attracted to the fixed core 13 to energize the starting motor M and start it.

According to the rotation of the rotor shaft 6, the output shaft 23 is decelerated and driven via the drive gear 26 and the driven gear 27, and further via the one-way clutch C, so that the output shaft 23 is driven to the pinion gear with a large drive torque. Rotate 33.

If the tooth traces of the pinion gear 33 and the ring gear 35 match at the initial stage of rotation, the pinion gear 33 will be able to absorb the buffer spring 39 and the overload spring 48.
moves forward due to the elastic force stored in the ring gear 3.
5 and drives the ring gear 35, the engine is cranked and started.

When the engine starts, the ring gear 35 rotates at a high speed and drives the pinion gear 33 at a speed faster than the rotation of the driven gear 27. When the one-way clutch C becomes disengaged, the reverse load on the ring gear 35 is transferred to the starting motor. The signal is not transmitted to the M side, and overrun can be prevented.

After starting, when the starting switch is turned off, the movable iron core 14 of the electromagnetic switch S is returned to its initial position by the elastic force of the return spring 15, and the movable contact 17 is separated from the fixed contact 21, thereby disabling the starting motor M. At the same time, the movable rod 38 retreats due to the elastic force of the return spring 43, moving the pinion gear 33 to the ring gear 35.
It is removed from the pinion housing 49 and stored in the pinion housing 49.

As described above, according to the present invention, the starting motor M is attached to one side of the transmission housing H, the output shaft 23 is rotatably supported on the transmission housing H, and the rotor shaft 6 of the starting motor M is connected to the A pinion moving device D houses a one-way transmission T that transmits driving force in one direction to the output shaft 23, and connects a pinion gear 33 connected to the output end of the output shaft 23.
The pinion gear 33 is interlocked with the starting electromagnetic switch S of the starting motor M via the starting motor M, and when the electromagnetic switch S is operated, the pinion gear 33 is moved to a meshing position with a driven gear such as a ring gear 35. A moving rod 38 is connected to the electromagnetic switch S so as to be movable therein, and is disposed parallel to the operating rod 22 of the electromagnetic switch S. shift lever 4 connected to
7, and a torsion coil type overload spring 48 which connects the lever 47 and the operating rod 22 so as to apply operating torque to the shift lever 47, and which elastically deforms when subjected to torsional torque exceeding a predetermined value. Since the pinion moving device D is configured as follows,
The overload spring 48 allows the electromagnetic switch S to operate normally, absorbs the impact when the pinion gear 33 meshes with the driven gear 35, and prevents damage to these gears.
Due to the cooperative lever action of 7 and overload spring 48,
Since the lever 47 and the spring 48 can be installed at the same location, the volume of the transmission housing H can be reduced.

The overload spring 48 also includes a coil portion 48c that is loosely inserted into the pivot pin 46, a first locking arm 48a that extends from the coil portion 48c and engages the shift lever 47, and a first locking arm 48a that extends from the coil portion 48c and engages the shift lever 47.
a second locking arm 48b that extends from c and engages with the operating rod 22; The spring 4
The outer periphery of the coil portion 48c of No. 8 and the second locking arm 48
first and second spring bearing surfaces that respectively support b.
Since f ₁ and f ₂ are formed, only the two members of the shift lever 47 and the overload spring 48 can be assembled in a small assembly with the normal set load applied to the spring 48. , the shift lever 47 can be inserted and inserted easily without any strong spring force of the overload spring 48 acting on it;
It can contribute to improving the efficiency of assembly work. Further, even after the device is assembled, the strong spring force of the overload spring 48 does not act on the pivot pin 46 at all, so the shift lever 47 can always be smoothly rotated around the pivot pin 46, and the pinion gear 3
3 to the driven gear 35 quickly, the bending load on the pivot pin 46 is reduced, the durability of the pin 46 is increased, and its diameter can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of the main part of an embodiment of the present invention;
Figures 2 and 3 are - and - of Figure 1.
Fig. 4 is an exploded perspective view of the main parts, Fig. 5
The figure is a rear view of the rear housing. D...Pinion moving device, H...Transmission housing, M...Starting motor, S...Electromagnetic switch, T
... One-way transmission device, 6 ... Rotor shaft, 22 ...
Operating rod, 23... Output shaft, 33... Pinion gear, 35... Ring gear, 38... Moving rod, 46
... Pivot pin, 47 ... Shift lever, 48
...Overload spring, 48a...First locking arm, 48b
...Second locking arm, 48c...Coil part, f ₁ , f ₂ ...
...First and second spring bearing surfaces.

Claims (1)

[Claims] 1. A starting motor M is attached to one side of the transmission housing H, and an output shaft 23 is rotatably supported on the transmission housing H, and is driven in one direction from the rotor shaft 6 of the starting motor M to the output shaft 23. A pinion gear 33 housing a one-way transmission T for transmitting force and connected to the output end of the output shaft 23
to the starting motor M via the pinion moving device D.
The pinion gear 33 is interlocked with a starting electromagnetic switch S to move the pinion gear 33 to a meshing position with a driven gear such as a ring gear 35 when the electromagnetic switch S is activated.
A moving rod 38 is connected to the electromagnetic switch S so as to be movable therein, and is disposed parallel to the operating rod 22 of the electromagnetic switch S. a shift lever 47 connected to the shift lever 4;
The lever 47 and the operating rod 22 are connected to each other so as to apply an operating torque to the pinion moving device 7, and a torsion coil-type overload spring 48 that is elastically deformed when subjected to a torsional torque of a predetermined value or more The overload spring 48 has a coil portion 48c loosely inserted into the pivot pin 46, a first locking arm 48a extending from the coil portion 48c and engaging the shift lever 47, and a coil portion 48c. A second locking arm 48b that extends from a portion 48c and engages with the operating rod 22 is provided, and the shift lever 47 can independently hold the overload spring 48 with a predetermined torsional torque applied thereto. A starting motor device characterized in that first and second spring bearing surfaces f ₁ and f ₂ are formed to support the outer periphery of the coil portion 48c of the spring 48 and the second locking arm 48b, respectively.