JPH053744Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seal structure in a starter that allows the starter motor to be used as a power source for purposes other than engine starting.

[Problems to be solved by the prior art and the invention] Conventionally, the starter motor that starts the engine has been provided exclusively for that function, and therefore, it is completely in a rest state other than when starting the engine, and is useless. Ta. For this reason, for example, as shown in Japanese Unexamined Patent Publication No. 56-6065, there is known a device that has two sets of speed reduction mechanisms and extracts external power from the starter transmission system. However, since this product has 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 sealing structures are required between the output shaft and the case. To avoid significantly inferior assembly performance, it is preferable to lubricate parts close to the motor side for high-speed rotation, and for parts that have been decelerated to be lubricated for high-load use. The problem is that it would be extremely difficult to configure the system, so it cannot be adopted immediately.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a seal structure in a starter that can eliminate these drawbacks. A first output shaft includes an integrally formed sun gear, an internal gear fixed to the inner peripheral surface of the case bracket, and a pinion gear meshed between these two gears and meshed with a ring gear on the engine side. a first reduction mechanism that outputs power from the motor shaft side from the first output shaft side, a sun gear provided on the first output shaft, and a case bracket. It consists of an internal gear fixed to the inner circumferential surface of the gear, and a planetary gear meshed between these gears and supported on the second output shaft, which receives power from the first output shaft. A second reduction mechanism that outputs output from the second output shaft is arranged such that the second reduction mechanism is located closer to the pinion gear than the first reduction mechanism, and the second output shaft is free from the first output shaft. The first output shaft is rotatably fitted to the outside to form a concentric configuration, and the pinion gear is configured to take out power to the outside. It is characterized by a seal portion formed between the case bracket and the case bracket.

With this configuration, the present invention allows outputs for engine starting and external power to be taken out from the same side, but the seal structure only needs to be in one place, and moreover, it is possible to provide high-speed lubrication in the transmission system. This makes it possible to reliably use lubrication for high loads.

[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).
b, and a plurality of planetary gears 4c meshing between both gears 4a and 4b, and each planetary gear 4c is formed by a first output shaft 5 provided concentrically with the motor shaft 3. It is rotatably supported on the flange portion, and when the motor rotates, the rotation is transmitted to the first output shaft 5 in a decelerated state as the planetary gear 4c revolves around the sun gear 4a while rotating. It is becoming more and more like this. 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. an internal gear 6b fixed to the inner peripheral surface of the following end bracket 7 (which is integrally fixed to the intermediate bracket 12 with a bolt 16a);
A plurality of planetary gears 6 meshing between both gears 6a and 6b
c. Each planetary gear 6c, which revolves while rotating with respect to the sun gear 6a, is rotatably supported on the flange of the second output shaft 10, and as a result, the second reduction mechanism 6
The input signal is input from the sun gear 6a, decelerated, and output from a second output shaft 10, which is externally fitted onto the first output shaft 5 so as to be freely rotatable. They are concentric. 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. An output gear 10a is integrally provided at the tip of the second output shaft 10,
For example, it meshes with an input gear 11 on the side of an external operating unit such as a pump, and is configured so that external power can be taken out from the second output shaft 10 on the pinion gear 9 side.

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 starter motor, which has the two-stage reduction mechanism 4 and 6 and can start the engine and take out the external power output on the same side, its seal structure is as follows. . That is, the seal structure is configured to partition the first reduction mechanism 4 and the second reduction mechanism 6 arranged closer to the pinion gear 9 than the first reduction mechanism 4, and the sealing material 13 is (A reinforcing member 13a is provided) is fitted onto the inner circumferential surface 2 of the flange portion 12a of the boss provided on the intermediate bracket 12, and the lip portion 13b on the inner circumferential side It is designed to elastically abut against a seal contact portion 5a formed at a position corresponding to the seal portion for sealing. Furthermore, in this case, the outer diameter A of the seal abutting portion 5a is larger than the outer diameter B of the sun gear 6a in the second reduction mechanism 6 (A>B).

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 provided at only one location on the output side.

Moreover, this seal structure on the output side is configured to partition the first reduction mechanism 4 and the second reduction mechanism 6. Therefore, the starter includes members such as the motor shaft 3 and planetary gear 4c that rotate at high speed on the motor side, and a second reduction mechanism 6 that rotates at low speed but under high load on the output side, with this seal portion as a boundary. It will be divided into two parts. As a result, in the starter, it is possible to use the appropriate lubricant separately for the motor side, where lubrication for high speeds is desirable, and the output side, where lubrication for high loads is desirable. This will provide good lubrication. Here, the output side can be lubricated with engine oil, but it is possible to prevent this from acting on the motor side, and it is possible to use an appropriate lubricant such as grease on the motor side. Furthermore, since the object that the sealing material 13 comes into contact with is the output shaft 5 which has been primarily decelerated by the first deceleration mechanism 4, its sliding resistance can be reduced and transmission efficiency can be improved. Become.

Moreover, in this device, the sun gear 6a of the second reduction mechanism 6 is integrally formed on the first output shaft 5, and the seal abutting portion 5a that the seal material 13 comes into contact with is the sun gear 6a. Since the diameter is larger than that of the first output shaft 5 when assembling the starter, damage to the sealing material 13 by the sun gear 6a can be effectively avoided when fitting the first output shaft 5 from the sealing material 13 side. This allows for a highly reliable seal structure.

[Function and Effect] In summary, since the present invention is constructed 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.Moreover, both output shafts are designed so that external power can be taken out from the second output shaft on the pinion gear side. Although the seal structure with the case bracket can be made only in one place on the output side,
In this case, the seal portion is formed to partition the first speed reduction mechanism and the second speed reduction mechanism.
As a result, in the starter, the optimal lubricant can be used separately on the motor side, where lubrication for high speeds is desirable, and on the output side, where lubrication for high loads is desirable. This will provide good lubrication. Moreover, the thing that the sealing material comes into contact with is the first output shaft that has been primarily decelerated by the first deceleration mechanism, so
The sliding resistance with the sealing material can be reduced, and transmission efficiency can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the seal structure in the starter according to the present invention, in which FIG. 1 is a partially cutaway front view of the starter motor, and FIG. 2 is an enlarged front view of the seal portion. 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. In the two output shafts, 13 is a sealing material.

Claims (1)

[Scope of utility model registration request] A sun gear integrally formed on the motor shaft, an internal gear fixed to the inner peripheral surface of the case bracket, and a pinion gear meshed between these two gears and meshed with a ring gear on the engine side. Consists of a planetary gear supported on one output shaft side,
a first reduction mechanism that outputs power from the motor shaft side from the first output shaft side; a sun gear provided on the first output shaft; and an internal gear fixedly installed on the inner peripheral surface of the case bracket; A second reduction mechanism is configured with a planetary gear meshed between these gears and supported on the second output shaft side, and outputs the power from the first output shaft side from the second output shaft. The second reduction mechanism is arranged so as to be located closer to the pinion gear than the first reduction mechanism, and the second output shaft is fitted externally to the first output shaft so as to be freely rotatable and is concentric with the pinion gear. It is characterized by a configuration that allows power to be extracted to the outside from the side, and a seal portion is formed between the first output shaft and the case bracket to partition the first reduction mechanism and the second reduction mechanism. Seal structure in starters.