JPH04302760A - Automatic transmission - Google Patents

Abstract

PURPOSE:To prevent a sealing member from coming out or from being damaged when a center support is assembled as well as to lessen sealing areas and parts in number, and thereby enhance maintenability when the center support is connected/disconnected. CONSTITUTION:A counterbore 14 having an opening section 16 for an oil passage 15 is provided for a center support 11. a cylindrical projected section 18 is provided for a valve body 13. The tip end 18a of the cylindrical projected section 18 is formed with the opening section of an oil passage 19 from the valve body. The opening section 16 of the oil passage 15 of the center support 11 is made smaller in diameter than the counterbore 14. An elastic sealing member 17 is pushed in the opening section 16 of the oil passage 15 of the center support 11 with pressure. The tip end 18a of the cylindrical projected section 18 is then brought into contact with the elastic sealing member 17.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission, and more particularly to a seal structure for a center support of an automatic transmission for a vehicle.

0002

[Prior art] The center support of conventional automatic transmissions is
As shown in FIG. 3, after an O-ring 3 was assembled to the mating surface of the center support 1 to the case 2 of the automatic transmission, it was inserted into the case 2 and fixed with bolts 4 from the case side.

0003

By the way, as shown in FIG. 4, oil passages 5 and 6 for engaging friction materials are formed in the center support 1 and the case 2, respectively. However,
When inserting the center support 1 into the case 2 and aligning the oil passages 5 and 6, there was a problem that the O-ring 3 could be twisted against the inner wall of the case 1 and come off or be damaged.

On the other hand, in the case of the seal structure shown in FIG. 5, after the center support is assembled, the elastic seal member 7 is pressed and assembled from below by the cylindrical member 8, so the problem of the seal member 7 being twisted is solved. However, since there are two sealing locations, A and B, reliability against oil leakage and an increase in the number of parts can be considered. In this case, in addition to the seal member 7, a gasket 9 is installed between the case 1 and the valve body 10. In addition, when it becomes necessary to rearrange the center support 1, the seal member 7 press-fitted by the cylindrical member 8
cannot be removed before the center support 1 is removed, and the seal member 7 is damaged when the center support 1 is removed, which not only makes it impossible to reuse it, but also
It was necessary to punch out the cylindrical member 8 from the oil passage 6, which caused problems in maintenance.

Therefore, the present invention aims to prevent the seal member from coming off and being damaged when assembling the center support, reduce the number of seal parts and parts, and improve maintenance when the center support is attached and detached. With the goal.

[0006]

[Means for Solving the Problems] The present invention provides a center support inserted into a case of an automatic transmission with a counterbore having an opening for an oil passage, a cylindrical protrusion on a valve body, and a cylindrical protrusion. An opening for an oil passage from the valve body is formed at the tip of the valve body, the diameter of the opening for the oil passage in the center support is formed to be smaller than the diameter of the counterbore, and an elastic seal member is press-fitted into the opening for the oil passage in the center support. The tip of the cylindrical protrusion is pressed into contact with the elastic seal member.

[0007]

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

FIG. 1 is a front view of the center support of the present invention. The center support 11 is fixedly supported by a case 12 as shown in the figure, and a valve body 13 is disposed below the center support 11.

The center support 11 is counterbored from the outside, and the counterbored portion 14 has an oil passage 15 for engaging a friction material disposed inside the center support 11.
An opening 16 is formed. In view of the relationship with the valve body 13, the counterbore process is performed in a direction perpendicular to the mounting surface of the valve body 13 to the case 12, and is performed at a position corresponding to a sealing surface with the valve body 13, which will be described later. Therefore, the oil passages 15 are formed in a radial shape, and an oil passage 15a in a counterbore direction is formed in the middle by counterbore processing.

The opening 16 of the oil passage 15 is formed to have a stepped shape smaller than the diameter of the counterbore 14 as shown in the figure. A seal ring 17 is press-fitted into the opening 16, and the tip of the cylindrical protrusion 18 of the valve body 13 is pressed into contact with the seal ring 17.

FIG. 2 is an enlarged sectional view of the seal structure of the center support of the present invention. A cylindrical protrusion 18 is formed on the valve body 13 to protrude in a direction perpendicular to a mounting surface of the valve body 13 to the case 12. An oil passage 19 from the valve body 13 is formed inside the protrusion 18 . The opening of the oil passage 19 is formed at the tip 18a of the protrusion 18. A gap is provided between the outer wall of the protruding portion 18 and the inner wall of the counterbore portion 14 in consideration of design errors.

In this way, the tip 18a of the protrusion 18
is pressed against the seal ring 17 to seal the valve body 13 and the center support 1, and the valve body 13 is fixed to the case 12.

As for the assembly order of the center support 11 and the valve body 13, the center support 11 is installed in case 1.
The center support 11 is inserted into the case 12 and supported on the inner wall of the case 12, and the center support 11 is fixed to the case 12 from the outside of the case 12 with bolts (not shown). Next, the seal ring 17 is press-fitted into the opening 16 of the counterbore portion 14 of the center support 11. Finally, the tip 18a of the cylindrical protrusion 18 of the valve body 13 is pressed against the seal ring 17 to fix the valve body 13 to the case 12.

[0014] In this way, when inserting the center support 11 into the case 12, the seal ring 17 is not twisted or damaged. Furthermore, since there is only one sealing location, reliability against oil leakage can be improved and the number of parts can be reduced. Further, when removing the center support 11, the valve body 13 is removed first, thereby solving the conventional problem and improving the maintenance of attaching and removing the center support 11.

[0015]

As explained above, according to the automatic transmission of the present invention, the center support is provided with a counterbore having an oil passage opening, the valve body is provided with a cylindrical protrusion, and the cylindrical protrusion is An opening for the oil passage from the valve body is formed at the tip, the diameter of the opening for the oil passage in the center support is formed smaller than the diameter of the counterbore, and an elastic seal member is press-fitted into the opening for the oil passage in the center support. Since the tip of the cylindrical protrusion is pressed into contact with the elastic seal member, the seal ring will not come off or be damaged when the center support is assembled to the case. Furthermore, since there is only one sealing location, reliability against oil leakage can be improved and the number of parts can be reduced. Furthermore, when removing the center support, by removing the valve body first, the conventional problems are solved, and maintenance for attaching and removing the center support is improved.

[Brief explanation of drawings]

FIG. 1 is a front view of a center support of the present invention.

FIG. 2 is an enlarged sectional view of the seal structure of the center support of the present invention.

FIG. 3 is an exploded perspective view of a conventional center support.

FIG. 4 is an enlarged sectional view of a conventional center support seal structure.

FIG. 5 is an enlarged sectional view of a conventional center support seal structure.

[Explanation of symbols]

11 Center support 12 Case 13 Valve body 14 Counterbore 15 Center support oil passage 16 Opening 17 Seal ring (elastic sealing member) 18 Cylindrical protrusion 18a Tip 19 Valve body oil passage

Claims (1)

[Claims] Claim 1: A center support inserted into a case of an automatic transmission is provided with a counterbore having an opening for an oil passage, a cylindrical protrusion is provided on a valve body, and the tip of the cylindrical protrusion is provided with a counterbore having an opening for an oil passage. forming an opening for an oil passage, forming the diameter of the opening for the oil passage in the center support to be smaller than the diameter of the counterbore, press-fitting an elastic seal member into the opening for the oil passage in the center support; An automatic transmission characterized in that a tip of the cylindrical protrusion is pressed into contact with a member.