JPH0334297B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a starter motor thrust receiving structure that allows the starter motor to be used as a power source for purposes other than engine starting.

[Prior Art and Problems to be Solved by the Invention] Conventionally, a starter motor for starting an engine has been provided exclusively for that function, and therefore, it has been in a completely idle state except when starting the engine, and was useless. . For this reason, there are known systems in which external power is extracted from the starter transmission system, as shown in, for example, Japanese Patent Application Laid-Open No. 56-6065 or Japanese Utility Model Application No. 56-165988. However, since all of these devices have a structure in which the engine is started on one side of the output shaft and external power is taken out on the other side, two seal structures are required between the output shaft and the case. The disadvantage is that the ease of assembly is significantly poorer. Therefore, it is convenient to perform both output for engine starting and external power extraction on one side of the output shaft, since the seal structure can be simplified, but in this case, the axial direction for each output shaft Regarding thrust movement, it is necessary to take new measures from the viewpoint of reducing the number of parts and improving ease of assembly.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention has been devised for the purpose of providing a thrust receiving structure for a starter motor that can eliminate these drawbacks. a first reduction mechanism for transmitting power from a motor shaft side disposed on one side to a first output shaft provided with a pinion gear meshing with an engine side ring gear disposed on the other end side; ,
a second deceleration mechanism for transmitting the power of the first output shaft to a second output shaft, and the second output shaft is fitted around the first output shaft so as to be freely rotatable and has a concentric shape. In the starter motor configured such that external power can be taken out on the pinion gear side, the first reduction mechanism is installed in an intermediate bracket that is integrally assembled following the yoke bracket of the motor, and the second reduction mechanism is installed in an intermediate bracket that is assembled integrally with the yoke bracket of the motor. The first output shaft is respectively housed in an end bracket that is assembled integrally with the intermediate bracket, and the first output shaft is engaged with the first output shaft and the intermediate bracket, respectively, so that thrust movement in the direction of the pinion gear is restricted. The second output shaft is rotatably supported on the intermediate bracket via a bearing that is stopped, and the second output shaft is engaged with the second output shaft and the end bracket, respectively, so that thrust movement toward the motor section is restricted. A second output shaft is rotatably supported on the end bracket via a bearing to be stopped, and a second output shaft is connected between the pinion gear side ends of the first and second output shafts. The present invention is characterized in that a stop member is provided to restrict relative thrust movement in the direction of the pinion gear.

With this configuration, the present invention allows outputs for starting the engine and for extracting external power from the same side, while greatly simplifying the structure that restricts the thrust movement of both output shafts in the axial direction. It was made so that it could be done.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a yoke bracket (case) of a starter motor, and a motor shaft 3 constituting an armature 2 is rotatably supported on the bracket 1. A gear is attached to one end of the motor shaft 3. 4a is engraved. That is, this gear 4
a constitutes a sun gear which is an input gear of the first reduction mechanism 4 constituted by a planetary gear mechanism, and the first reduction mechanism 4 is connected to the sun gear 4a.
and an intermediate bracket 12 following the bracket 1.
(It is integrally fixed to the yoke bracket 1 with a through bolt 16), and includes an internal gear 4b fixed to the inner peripheral surface of the intermediate bracket 12, and both gears 4a, 4b. It is formed by a plurality of planetary gears 4c that mesh with each other,
Moreover, each planetary gear 4c is rotatably supported on a flange portion of a first output shaft 5 provided concentrically with the motor shaft 3, so that when the motor rotates, the rotation is caused by the rotation of the planetary gear 4c. While sun gear 4a
The deceleration is transmitted to the first output shaft 5 by rotating around the earth. A pinion gear 9 that meshes with a ring gear 8 on the engine side is integrally provided at the tip of the first output shaft 5, and the engine is started by the rotation of the first output shaft 5 described above. It is becoming more and more like this.

On the other hand, 6 is a second reduction mechanism, and the second reduction mechanism 6 has a sun gear 6a as a gear carved on the first output shaft 5, and a sun gear 6a and the intermediate bracket 12. It is installed internally in the succeeding end bracket 7 (which is integrally fixed with the intermediate bracket 12 by a bolt 16a), and an internal tooth gear 6b is fixed to the inner circumferential surface of the end bracket 7.
and a plurality of planetary gears 6c meshing between both gears 6a and 6b. Each planetary gear 6c, which revolves while rotating with respect to the sun gear 6a, is rotatably supported on the flange portion of the second output shaft 10, so that the second reduction mechanism 6 receives input from the sun gear 6a. However, the second output shaft 10 is fitted around the first output shaft 5 so as to be freely rotatable and is concentric with the first output shaft 5. There is.

When the first output shaft 5 rotates as described above by driving the motor, the second output shaft 10 is further decelerated and rotated via the second reduction mechanism 6 which uses this as an input shaft. This second output shaft 10
An output gear 10a is integrally provided at the tip of the , and meshes with an input gear 11 on the side of an external operating unit such as a pump, thereby causing the second output shaft 10 to be positioned on the pinion gear 9 side. It is configured so that power can be extracted to the outside.

In this embodiment, two types of power transmission systems from the motor shaft 3 to the output shafts 5 and 10 are not provided with one-way clutches, but in this case, the ring gear 8 Appropriate clutch mechanisms such as one-way clutches are provided for the transmission system from the engine to the engine, and the transmission system from the input gear 11 to the external operating section, respectively, so that they do not interfere with each other when starting the engine and operating the external operating section. It's summery.

In this way, in a starter motor that has a two-stage reduction mechanism 4, 6 and can obtain outputs for engine starting and external power extraction on the same side, the thrust bearing in the axial direction of the output shafts 5, 10 is used. The structure is constructed as follows. That is, the first output shaft 5
is rotatably supported on the intermediate bracket 12 by a bearing 13;
The motor-side end surface of the inner at 3 is engaged with a flange 5a formed on the motor-side end of the first output shaft 5 that has been previously assembled, while the outer pinion gear-side end surface is engaged with the flange 5a formed on the motor-side end of the first output shaft 5 that has been assembled in advance. The first output shaft 5 is configured to be locked to a stepped portion 12a formed on the intermediate bracket 12 to be incorporated, and thereby the first output shaft 5 is connected to the first output shaft 5 and the intermediate bracket 12, respectively, with respect to the intermediate bracket 12. It is rotatably supported in a state in which thrust movement toward the pinion gear is restricted via a locked bearing 13, so that thrust reception in the output side direction (direction of arrow A) is achieved. It's getting old.

On the other hand, the second output shaft 10 is rotatably supported on the end bracket 7 via a bearing 14, and the outer motor side end surface of the bearing 14 is attached to the end bracket 7 which is previously assembled. On the other hand, the pinion gear side end surface of the inner is configured to be locked to a retaining ring 10b that is later assembled to the second output shaft 10. The output shaft 10 is connected to the end bracket 7 by the end bracket 7 and the second output shaft 10.
It is rotatably supported in a state in which thrust movement toward the motor section is regulated through bearings 14 that are respectively locked to the A thrust receiver is now available.

Further, the first output shaft 5 and the second output shaft 10 are connected to each other by a retaining ring (corresponding to the retaining member of the present invention) 15 fitted to the outer periphery of the first output shaft 5 at the end on the pinion gear side. Mutual positional deviation in the core direction, that is, the first output shaft 5 is B with respect to the second output shaft 10.
On the other hand, the displacement of the second output shaft 10 in the A direction with respect to the first output shaft 5 is restricted.

Thus, the thrust movement of the first output shaft 5 in the A direction is received and regulated by the intermediate bracket 12 by the bearing 13 being engaged with the flange portion 5a and the step portion 12a. The thrust movement of the output shaft 10 in the B direction is performed when the bearing 14 is connected to the stepped portion 7a and the retaining ring 1.
0b, the first output shaft 5 is received and regulated by the end bracket 7, but the thrust movement of the first output shaft 5 in the B direction is transferred to the end bracket 7 via the bearing 14, and is also regulated by the end bracket 7. The thrust movement of the shaft 10 in the A direction is received by the intermediate bracket 12 via the bearing 13. In other words, when a load is applied to thrust the first output shaft 5 in the B direction, the load is applied to the second output shaft 10 through the retaining ring 15.
The load that thrusts the second output shaft 10 in the direction B is received and supported by the end bracket 7 via the bearing 14 as described above. Thrust movement of the first output shaft 5 in the B direction is restricted. Furthermore, when a load is applied to the second output shaft 10 to thrust it in the A direction, this acts as a load to thrust the first output shaft 5 in the A direction via the retaining ring 10b. The load for thrusting the first output shaft 5 in the A direction is received and supported by the intermediate bracket 12 via the bearing 13, as described above. Thrust movement of the second output shaft 10 in the A direction is restricted. In addition, in the figure, 1
Reference numeral 7 denotes a crankcase on the engine side, to which a starter motor is integrally fixed via an intermediate bracket 12 by bolts 16b.

In the embodiment of the present invention constructed as described above, the engine is started by turning on a starter switch (not shown). That is, when the motor shaft 3 rotates as the starter switch is turned ON, the rotation is decelerated by the first reduction mechanism 4 and output from the first output shaft 5. The engine is started via the provided pinion gear 9 and the ring gear 8 that meshes with the pinion gear 9. on the other hand,
Regarding the operation of the external actuating part, when the switch for the actuating part is turned on and the motor rotates, the second The output is output from the second output shaft 10 that rotates through a transmission system that performs stepwise deceleration, and the output gear 10a is provided on the second output shaft 10.
The external actuator is operated via the input gear 11 that meshes with the input gear 11.

As described above, in the present invention, the starter motor can be effectively used not only for starting the engine but also as a power source for external operating parts. The second output shaft 10, which serves as the output shaft for the external operating section, has a structure in which the second output shaft 10 is externally fitted onto the first output shaft 5, and is coaxial with the output shaft from the pinion gear 9 side. External power can be taken out, and therefore, the sealing structure for the bracket 1 can be made only at one point where the output shaft protrudes, which greatly simplifies assembly and greatly improves reliability. It turns out.

Furthermore, among the loads of thrust movement in the axial direction acting on both output shafts 5 and 10, when the first output shaft 5 is in the A direction, it is received and supported by the intermediate bracket 12 via the bearing 13. , B direction, it is received and supported by the end bracket 7 via the retaining ring 15, the second output shaft 7, and the bearing 14. On the other hand, when the second output shaft 10 is in the B direction, it is received and supported by the end bracket 7 via the bearing 14, and when it is in the A direction, the retaining ring 15, the first output shaft 5, It is received and supported by the intermediate bracket 12 via the bearing 13. As a result, the output shafts 5, which are arranged concentrically,
The thrust movement in direction A of 10 is received and supported by intermediate bracket 12 via bearing 13, and the thrust movement in direction B is received and supported by end bracket 7 via bearing 14. In order to receive and support the thrust movement of both output shafts 5 and 10, the pinion gear side ends of both output shafts 5 and 10 are connected to the second output shaft 10 with respect to the first output shaft 5.
a thrust receiving mechanism that restricts the movement of the first output shaft 5 in the direction B by a simple structure in which a retaining ring 15 is simply provided to restrict the relative displacement of the first output shaft 5 toward the pinion gear; Second output shaft 10
The thrust receiving mechanism that restricts movement in the A direction is no longer required, the structure is extremely simplified, the number of parts can be significantly reduced, workability and assemblability are significantly improved, and the cost is reduced. This means that we can provide a large amount of highly reliable products.

Furthermore, in this case, the side surface of the motor section of the bearing 13 is locked to the flange section 5a of the first output shaft 5, and the side surface of the pinion gear of the bearing 13 is locked to the step section 1 of the intermediate bracket 12.
2a to restrict the thrust movement of the first output shaft 5 in the A direction, and the side surface of the motor section of the bearing 4 to be locked to the stepped portion 7a of the end bracket 7 to restrict the thrust movement of the first output shaft 5 in the A direction.
The side surface of the pinion gear is locked to the starting ring 10b provided on the second output shaft 10, and the one that restricts the thrust movement of the second output shaft 10 in the B direction is assembled, and the retaining ring 15 is fitted. By this extremely simple operation, it is possible to assemble the first output shaft 5 and the second output shaft 10 in a state where their thrust movements in the A direction and the B direction are respectively regulated as described above.

It should be noted that the present invention is of course not limited to the above-mentioned embodiments, and the thrust receiving directions on the case bracket side of each output shaft can be configured in a reverse relationship.

[Operation and Effect] In summary, since the present invention is configured as described above, the output from the starter motor is
In addition to starting the engine, it can be effectively used as a power source for external operating parts, and both output shafts are two output shafts with a second output shaft for external operating parts fitted onto the first output shaft for engine starting. The heavy shaft structure allows external power to be taken out from the second output shaft on the pinion gear side, and the seal structure between the output shaft and case bracket is now in one place instead of two on both sides of the shaft. However, the relative displacement of the second output shaft toward the pinion gear with respect to the first output shaft is restricted by the stopper member between both output shafts. Therefore, the load that thrusts the first output shaft in the direction of the motor section acts as a load that moves the second output shaft in that direction via the stopper, and this load is transferred to the end via the bearing. It is received and supported by the bracket. Also, the load that thrusts the second output shaft in the direction of the pinion gear acts as a load that moves the first output shaft in that direction via the stopper member, and this is applied to the intermediate bracket via the bearing. It will be accepted and supported.

As a result, for both output shafts arranged concentrically, thrust movement in the direction of the pinion gear is transferred to the intermediate bracket via the bearing, and thrust movement in the direction of the motor section is transferred to the end bracket via the bearing. In order to receive and support the thrust movement of these two output shafts, the pinion gear side ends of both output shafts are connected to each other so that the second force shaft is connected to the first output shaft. With a simple structure in which a stop member is simply provided to restrict relative displacement in the direction of the gear, the first output shaft can be moved in the direction of the motor section and the second output shaft can be moved in the direction of the pinion gear. This eliminates the need for dedicated thrust receiving mechanisms for each movement, simplifying the structure, significantly reducing the number of parts, making it lighter and more compact, and significantly improving workability and ease of assembly. , it will be possible to provide inexpensive and highly reliable products in large quantities.

[Brief explanation of drawings]

The drawings show an embodiment of the thrust receiving structure for a starter motor according to the present invention.
The figure is a partially cutaway front view of the starter motor. In the figure, 1, 7, and 12 are brackets, 3 is a motor shaft, 4 is a first reduction mechanism, 5 is a first output shaft, 6 is a second reduction mechanism, 8 is a ring gear, 9 is a pinion gear, and 10 is a third reduction mechanism. 2 output shafts, 11 is external input gear, 1
3 and 14 are bearings, and 15 is a retaining ring.

Claims (1)

[Claims] 1. A first reduction gear for transmitting power from the motor shaft side disposed on one end side to a first output shaft provided with a pinion gear that meshes with an engine side ring gear disposed on the other end side. and a second reduction mechanism for transmitting the power of the first output shaft to the second output shaft, and the second output shaft is externally fitted onto the first output shaft so as to be freely rotatable. and make it concentric,
In a starter motor configured such that external power can be taken out on the pinion gear side, the first reduction mechanism is installed in an intermediate bracket that is integrally assembled following the yoke bracket of the motor, and the second reduction mechanism is installed in the intermediate bracket. and the first output shaft is respectively locked to the first output shaft and the intermediate bracket so that thrust movement in the direction of the pinion gear is restricted. The second output shaft is rotatably supported on the intermediate bracket via a bearing, and the second output shaft is locked on the second output shaft and the end bracket, respectively, so that thrust movement toward the motor section is restricted. The output shaft is rotatably supported on the end bracket via a bearing, and further between the pinion gear side ends of the first and second output shafts.
A thrust receiving structure for a starter motor, characterized in that a stop member is provided for restricting relative thrust movement of a second output shaft toward a pinion gear with respect to a first output shaft.