JPH0529528Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention prevents the snap spring from falling off when, for example, a rotation transmission gear is mounted on a transmission shaft with its axial position regulated by a shaft snap spring. Regarding the retaining structure for

[Conventional technology]

For example, when a rotation transmission gear is attached to a transmission shaft so that it can move in the axial direction by spline fitting, etc., a method is generally adopted in which a snap spring is attached to the transmission shaft in order to regulate the axial position of the gear. be done. By the way, since this shaft snap spring is made of a C-shaped spring member, when the transmission shaft rotates at high speed, its diameter expands due to centrifugal force, and in extreme cases, there is a risk that it may fall off from the shaft.

Conventionally, when a gear or the like is attached to a transmission shaft that rotates at high speed, a separate member such as a fixing nut is attached in place of the snap spring, or a snap spring is used to regulate the axial position of the gear. At the same time as the snap ring is installed, a member for preventing the snap ring from expanding is further installed.

[Problem that the invention aims to solve]

For example, the method of installing the fixing nut described above is as follows:
It requires threading on the transmission shaft, which poses a processing cost problem, and it can only be used near the end of the shaft.
Since the mounting position is restricted, there is a problem in that the degree of freedom in design is reduced. On the other hand, when a snap spring is used, a special structure is required to further prevent the spread of the snap spring as described above, which again poses structural and economical problems.

The present invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide a structure for preventing the shaft snap spring from falling off, which can reliably prevent the shaft snap spring from falling off without complicating the structure. It is said that

[Means for solving problems]

The present invention provides a retaining structure for preventing a shaft snap spring from falling off, which regulates the axial position of a rotation transmission member mounted on a rotation shaft so as to be movable in the axial direction. The end portion is supported by a support member via a bearing, and
The bearing is characterized in that the outer peripheral surface of the snap spring is covered with the bearing.

[Effect]

In the shaft snap spring retaining structure according to the present invention, the outer peripheral surface of the snap spring attached to the rotating shaft is covered with a bearing that supports the rotation transmission member on the support member, so that the rotating shaft rotates at high speed and the snap spring comes off. If the snap ring tries to expand in the opposite direction, the bearing prevents this expansion, thereby preventing the snap spring from falling off.

In this case, since the bearing, which is essential for supporting the rotating shaft, is also used as the expansion prevention means for the snap spring, no separate special means is required, and the structure is that much simpler.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a shaft snap spring retaining structure according to an embodiment of the present invention, and this embodiment is an example of a positioning snap ring for a reduction gear of an automatic transmission for an automobile.

In the figure, reference numeral 1 denotes a four-speed automatic transmission for automobiles to which the structure of this embodiment is applied, which includes a torque converter 2 with a lock-up mechanism, a speed change gear device 3 equipped with a Ravigneaux gear train, and an input path switching device 4. The engine output is
The transmission gear device 3 is connected to the input path switching device 4 via the input shaft 2a of the torque converter 2.
The signal is selectively inputted to a carrier that pivotally supports either a sun gear or a pinion gear, and is taken out from the ring gear 5 after being appropriately changed in speed.

A reduction gear 6 is attached to the boss portion 5a of the ring gear 5 by spline fitting. This reduction gear 6 meshes with an input gear 7a of a counter shaft 7, an output gear 7b of the counter shaft 7 meshes with a ring gear 8a of a differential gear device 8, and an output shaft 8b of the differential gear device 8. A wheel is attached to the tip.

The boss portion 5a of the ring gear 5 and the reduction gear 6 serve as a rotation shaft and a rotation transmission member of the present invention, respectively. The right end portion of the boss portion 5a in FIG. 1 is rotatably supported by the case body 11a of the transmission case 11 via a ball bearing 9.
b and the rear end of the boss portion 6a of the reduction gear 6. Further, the front part of the boss part 6a is connected to a side cover (supporting member) 1 which is bolted and fixed to the case body 11a via a ball bearing 10.
It is rotatably supported by 1b. The front end surface of the boss portion 6a of the reduction gear 6 is located inward from the front end surface of the ball bearing 10. Further, a ring groove 12a is formed in the front end of the boss portion 6a of the ring gear 5, and a shaft snap ring 12 is fitted into the groove 12a.
This snap spring 12 is in contact with the front end surface of the boss portion 6a of the reduction gear 6, and the outer peripheral surface of the snap spring 12 is covered with the inner peripheral surface of the ball bearing 10.

Next, the effects of this embodiment will be explained.

In this embodiment, the engine rotation is shifted through a gear position corresponding to the operation of the torque converter 2, the transmission gear device 3, and the input circuit switching device 4, and then is extracted as the rotation of the ring gear 5. In this embodiment, a reduction gear 6 as a rotation transmission member is attached to the boss portion 5a of the ring gear 5 as a rotating shaft so as to be movable in the axial direction by spline fitting, and a snap ring 12
In order to prevent the ring from falling off due to centrifugal force, when a shaft snap spring like this is installed, a special fall-off prevention means is required to prevent the ring from falling off due to centrifugal force. There was a problem in that the structure needed to be increased, and that alone would complicate the structure.

On the other hand, in this embodiment, the ring gear 5
The front end of the boss 5a does not directly support rotation, but supports the reduction gear 6 attached thereto via a ball bearing 10, and covers the outer peripheral surface of the snap spring 12 with the ball bearing 10. Therefore, this ball bearing 10 serves as a drop-off prevention means, and the snap ring 12 can be prevented from falling off without requiring any special prevention means.

In the above embodiment, the connection between the ring gear and the reduction gear of an automatic transmission was explained as an example, but the scope of application of the present invention is of course not limited to this, and in short, the connection part between the ring gear and the reduction gear of an automatic transmission is explained. It can be applied to any structure as long as the rotation transmission member is attached to the shaft while regulating the axial position with a snap spring.

[Effect of idea]

As described above, according to the shaft snap spring retaining structure according to the present invention, the end portion of the rotation transmission member attached to the rotating shaft is rotatably supported by the support member via the bearing, and the end portion of the rotation transmitting member attached to the rotating shaft is rotatably supported by the supporting member. Since the outer peripheral surface of the attached shaft snap ring is covered with the bearing, the bearing also serves as a means for preventing the snap spring from falling off, and there is an effect of preventing the snap ring from falling off without providing a special structure for preventing the snap ring from falling off.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a shaft snap spring retaining structure according to an embodiment of the present invention, and FIG. 2 is a sectional view of an automatic transmission to which this structure is applied. In the figure, 5a is the boss part (rotation shaft) of the ring gear, 6 is the reduction gear (rotation transmission member), 1
0 is a ball bearing, 11b is a side cover (supporting member),
12 is a snap ring.

Claims (1)

[Scope of utility model registration request] In a shaft snap spring that is fitted into a ring groove of a rotatably supported rotary shaft and regulates the axial position of a rotation transmission member that is axially movably mounted on the rotary shaft, the rotation of the rotary shaft is The snap spring has a retaining structure that prevents the snap spring from falling off due to centrifugal force caused by the rotating shaft, and the end portion of the rotation transmission member attached to the rotating shaft is supported by a support member via a bearing, and the snap spring is prevented from falling off by the bearing. A shaft snap spring retaining structure characterized by covering the outer circumferential surface of the shaft.