JPS6312270Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a center support mounting structure for a transmission case of an automatic transmission.

[Background technology]

2. Description of the Related Art Automatic transmissions commonly used in automobiles are equipped with a center support that fits into the inner peripheral surface of a longitudinally central portion of a transmission case that constitutes the outer shell of the automatic transmission. The center support has a rotating shaft fitting hole formed inside thereof, and serves as a centering member for the rotating shaft, and may also function as a reaction force member and a hydraulic cylinder.

Therefore, when installing the center support, it is necessary to accurately center the rotating shaft fitting hole with respect to the transmission case, firmly attach it to the transmission case, and ensure that the center support's oil is not connected to the transmission case's oil passage. Accurate and close matching of the passageways is required.

By the way, the center support is assembled by being inserted from the longitudinal end of the transmission case, and then pulled out from the end to be disassembled. Therefore, in order to facilitate assembly and disassembly, the transmission case and center support are fitted into each other with a relatively large gap. Therefore, when assembling and installing the center support, the center of the outer peripheral surface of the center support does not coincide with the center of the inner peripheral surface of the transmission case. Therefore, the rotating shaft fitting hole formed inside the center support is offset from the center of the outer circumferential surface of the center support so that its center coincides with the center of the inner circumferential surface of the transmission case.

FIG. 1 shows a conventional example of a center support mounting structure for a general transmission case. The center support 10 has an outer circumferential surface that fits into the inner circumferential surface of the transmission case 12, and has a rotary shaft fitting hole 14 formed inwardly with a center O' offset from the center O of the outer circumferential surface. has been done. This center support 10 is arranged so that a virtual straight line C passing through the centers O and O' passes through the center of the inner peripheral surface of the transmission case 12, that is,
It is fitted onto the inner circumferential surface of the transmission case so that the center O' coincides with the center of the inner circumferential surface of the transmission case. The center supports 10 fitted and arranged as described above are arranged on both the left and right sides of the virtual straight line C, and are fixed by mounting bolts 16A and 16B inserted through the transmission case 12.

In the conventional mounting structure, the mounting bolts are arranged as described above, so if the mounting bolts are not tightened properly, the center O' of the rotating shaft fitting hole 14 may be deflected in the left-right direction in FIG. become. Therefore, in the conventional fastening work, it was necessary for the worker to alternately and gradually tighten both mounting bolts based on his or her intuition, which took time and required confirmation and adjustment using a gauge or the like.

[Purpose of invention]

In consideration of the above facts, the present invention aims to provide a center plate mounting structure for an automatic transmission that can be easily assembled with high precision.

[Summary of the idea]

In the center support mounting structure for an automatic transmission according to the present invention, a pair of mounting screws are coaxially opposed to each other on the transmission case, and the center of the outer peripheral surface of the center support and the center of the rotating shaft fitting hole are aligned with the center of the mounting screw. By arranging it on the axis, it is possible to easily assemble it with high precision.

[Example of idea]

An embodiment of an automatic transmission with a torque converter to which the center support mounting structure of the present invention is applied is shown in Fig. 2. The automatic transmission shown in the figure is constructed by integrally connecting a transmission case 12 constituting the outer shell of the automatic transmission main body in the center, an oil pan 18 below the transmission case, a converter housing 20 in front of the transmission case, and a rear cover 22 at the rear.

The center support 10 is fitted into the inner circumferential surface of the transmission case 12 in the center in the longitudinal direction, and a rear clutch 24 is provided on the front outer circumference and a one-way clutch 26 is provided on the rear outer circumference outside the boss portion 10A extending forward and rearward. are rotatably fitted to each other. Further, an output shaft 28 is rotatably fitted into the rotary shaft fitting hole 14 formed inside the center support.

FIG. 3 shows details of the center support mounting structure shown in FIG. 2 above. The center support 10 has an outer peripheral surface shape that fits into the inner peripheral surface of the transmission case 12 with a gap 2E. Further, a rotating shaft fitting hole 14 having a center O' offset by a distance E from the center O of the outer circumferential surface is formed inwardly. Furthermore, two bolt engagement holes 30 and 32 having center lines coinciding with an imaginary straight line C passing through the centers O and O' are opened in the outer peripheral surface of the center support. One bolt engagement hole 30 is formed in a conical shape, and the other bolt engagement hole 32 is formed in a female thread.

The transmission case 12 has bolt through holes 34 and 36 formed diametrically opposed to each other on the inner peripheral surface thereof. One of the through holes 34 is formed as a female screw, and the other through hole 36 is formed as a bolt hole.

The mounting bolts 38 and 40 each have a bolt through hole 3.
4 and 36, one bolt 38 is a push-in bolt with a lock nut 42, and the other bolt 40 is a screw-in bolt.

Next, we will explain how to attach the center support to the transmission case. Center support 10
is inserted from the left end of the transmission case 12 in FIG. 2 with other parts assembled together. After being inserted to the mounting position, the bolt through hole 34 of the transmission case is aligned with the bolt engaging hole 30 of the center support, and the bolt through hole 36 is aligned with the bolt engaging hole 32, respectively. Next, insert the mounting bolt 40 through the bolt through hole 36,
Screw into the bolt engagement hole 32 of the center support,
Fasten the transmission case and center support together. On the other hand, from the bolt through hole 34,
A mounting bolt 38 is screwed into this and inserted, and the tip of the bolt presses the center support through the bolt engagement hole 30. After tightening both mounting bolts 38 and 40 to the specified torque, the mounting bolt 38 is finally fixed with a lock nut 42 to complete the work.

As described above, in this embodiment, the mounting bolts, one of which is a screw-in bolt and the other of which is a push-in bolt, are arranged to face each other on an imaginary straight line in the diametrical direction of the transmission case, and furthermore, the center support can be rotated by these two bolts. Offset direction C of shaft fitting hole
The structure is such that it can be fixed from the top. Therefore, it is only necessary that the tightening torque is appropriate, and high-precision assembly is possible without requiring the conventional work that relies on the intuition of workers, and productivity is also improved.

In the above embodiment, the mounting bolt 40 is disposed between the oil passages 44 and 46 in order to make the joint of the oil passage tight, but the mounting bolt 40 may be disposed at another position depending on the case. There is no problem.

[Effect of idea]

As explained above, in the center support mounting structure for an automatic transmission according to the present invention, a pair of mounting screws face each other and are coaxial, and the center of the outer peripheral surface of the center support and the center of the fitting hole are arranged on the axis of the mounting screw. This has the effect of making it easy to assemble with high precision.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional example of a center support mounting structure, FIG. 2 is a partially cutaway schematic surface view showing an example of an automatic transmission to which the center support mounting structure according to the present invention is applied, and FIG. Figure 2 shows the center support mounting structure in detail in Figure 2.
FIG. 10... Center support, 12... Transmission case, 14... Rotating shaft fitting hole, 30,
32... Bolt engagement hole, 34, 36... Bolt through hole, 38, 40... Mounting bolt, O... Center support center, O'... Rotating shaft fitting hole center, C...
...A virtual straight line passing through the centers O and O'.

Claims (1)

[Scope of utility model registration request] The center support, which has an outer circumferential surface that fits with the inner circumferential surface of the transmission case of an automatic transmission with a gap and has a rotating shaft fitting hole, is attached to the transmission case using a mounting screw that passes through the transmission case. In the mounting structure of a center support fixed to a transmission case, a pair of the mounting screws are arranged coaxially and facing each other, and the center of the outer peripheral surface of the center support and the center of the rotation shaft fitting hole are the axis of the mounting screw. A center support mounting structure for an automatic transmission characterized by being located above the center.