JPH06331027A - Oil path structure for automatic transmission - Google Patents

Abstract

PURPOSE:To provide an oil path structure for an automatic transmission wherein work is simplified by eliminating apprehension of oil leakage and preventing an oil path from lengthening. CONSTITUTION:An oil path structure for an automatic transmission is provided wherein a control valve 5 and an oil pump cover mounted on a transmission case 1 are provided, and a plurality of oil paths 91, 92, 93, 94 for connecting a pressure of oil from the control valve 5 to the oil pump cover are provided in the transmission case 1. Valve side passages 91a, 92a, 93a, 94a of linearly extending a plurality of the oil paths 91 to 94 from a control valve mounting surface 11 and pump side passages 91b, 92b, 93b, 94b linearly extended from an oil pump cover mounting surface 12 are orthogonally formed, to arrange center axes of the oil paths 91 to 94 flush on the same plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil passage structure for an automatic transmission provided in an automobile.

[0002]

2. Description of the Related Art Conventionally, as an oil passage structure of an automatic transmission,
For example, the one described in Japanese Utility Model Publication No. 2-19698 is known. In FIG. 1 of this publication, in an oil passage structure in which an oil passage for communicating hydraulic pressure from a control valve to the oil pump cover is formed in a transmission case, on a joint surface between the transmission case and the oil pump cover. There is described a structure in which an oil groove is formed in the oil groove, a connection position with the oil passage of the oil pump is set at one end of the oil groove, and an opening communicating with the control valve is provided at the other end.

Therefore, according to this structure, as shown in FIG. 3 of the above publication, a valve side passage linearly extended from the control valve mounting surface and a linear extension from the oil pump cover mounting surface. Compared to the technology of forming an oil passage by connecting the pump side passage to the pump side passage with a side hole drilled from the side of the case, the side hole is not required, and the degree of freedom in design can be improved, and the side hole can be bored. The effect of reducing the number of parts by eliminating the plug that closes the end was obtained.

[0004]

However, in the above-mentioned prior art, since the oil groove is formed on the joint surface between the transmission case and the oil pump cover, oil may leak from the joint surface. . In addition, this oil groove is formed in a meandering manner to avoid interference with the mounting bolts and other oil passages, and the oil passage becomes longer than necessary, which causes a problem of poor hydraulic response. .

The present invention has been made in view of the above problems, and provides an oil passage structure for an automatic transmission that is free from the risk of oil leakage, does not lengthen the oil passage, and is easy to process. The purpose is to do.

[0006]

In order to achieve the above-mentioned object, the present invention is different from a case for accommodating a power transmission mechanism inside, a control valve attached to this case, and a mounting surface of this control valve. An oil passage structure of an automatic transmission, comprising: an oil pump cover attached to the case at an attachment surface; and a plurality of oil passages for communicating hydraulic pressure from a control valve with the oil pump cover are provided in the case, The plurality of oil passages are formed by intersecting a valve-side passage linearly extending from the mounting surface of the control valve and a pump-side passage linearly extending from the mounting surface of the oil pump cover. At least two oil passages of the plurality of oil passages are formed with their central axes arranged on the same plane.

A plane on which the central axis of the oil passage is arranged is provided in parallel with the central axis of the power transmission mechanism, and
The oil passage on this plane may be formed by intersecting the valve-side passage and the pump-side passage at a right angle, and arranging the valve-side passages and the pump-side passages of the oil passages in parallel.

[0008]

In the structure of the present invention, the oil pressure of the control valve is communicated with the oil pump cover by the plurality of oil passages formed in the case. Since there is no portion passing through the joint surface in these oil passages, there is no risk of oil leakage in the middle of the oil passages.

When forming these oil passages, the valve side passage is linearly extended from the mounting surface of the control valve of the case, while the pump side passage is linearly extended from the mounting surface of the oil pump cover of the case. It is formed by extending and intersecting both passages. The passages may be formed at the same time when the case is formed by casting, or may be drilled after the case is manufactured. In any case, the horizontal holes are not required as in the conventional technique, so that the working operation is simple and the number of parts is small because a plug for closing the holes is not required.

Further, among the plurality of oil passages, at least two oil passages have their central axes arranged on the same plane, so that these oil passages can be arranged in a small space.

Further, in the structure according to the second aspect, the plane in which the central axis of the oil passage is arranged is provided in parallel with the central axis of the power transmission mechanism, and the valve side passage and the pump side passage are formed orthogonal to each other. In addition, since the valve side passages and the pump side passages are arranged in parallel,
The radial dimension of the case required for the oil passage, that is, the width dimension of the case can be reduced, and the axial dimension can also be reduced. In addition, positioning can be performed easily, especially when drilling. Can be processed.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a partially cutaway sectional view showing an oil passage structure of an automatic transmission according to an embodiment of the present invention, and FIG. 2 is a partial view showing a mounting surface side of an oil pump cover of a case to which the embodiment structure is applied,
FIG. 3 is a sectional view showing a part of an automatic transmission to which the structure of the embodiment is applied.

In FIG. 3, reference numeral 1 is a mission case in which a power transmission mechanism 2 is housed. Rotational power is input to the power transmission mechanism 2 from the torque converter 4 via the input shaft 3.

A control valve 5 (see FIG. 2) and an oil pump cover 6 are attached to the mission case 1. The control valve 5 is attached to a control valve mounting surface 11 formed on the lower portion of the mission case 1 by bolting in a joined state, and the oil pump cover 6 is an oil pump formed on the front surface of the mission case 1. It is attached to the cover attachment surface 12 in a joined state and sandwiched between it and the torque converter cover 7. The control valve mounting surface 11 and the oil pump cover mounting surface 12 are formed at a right angle. Further, in FIG. 3, 8 is an oil pump.

Next, the oil passage structure of the embodiment will be described with reference to FIGS. 1 and 2. In the mission case 1, a plurality of oil passages 91 and 9 (four in the embodiment) are provided for communicating the oil pressure of the control valve 5 with the oil pump cover 6.
2, 93, 94 are provided.

These oil passages 91, 92, 93, 94 are
Valve-side passages 91a, 92a, 93a, 94a linearly bored vertically from the control valve mounting surface 11
And the power transmission mechanism 2 from the oil pump cover mounting surface 12
The pump-side passages 91b, 92b, 93b, and 94b, which are linearly bored in a direction parallel to the central axis C, are formed so as to be orthogonal to each other at their tip portions. That is, each valve side passage 91a, 92a, 93a, 94a
Is drilled so that its depth gradually decreases from the upper passage 91a toward the lower passage 94a, while the pump-side passages 91b, 92b, 93b, 94b are separated from the oil pump 8. From the passage 91b toward the passage 94b on the side closer to the oil pump 8 so that the depth thereof gradually becomes shallower. Then, the oil passages 91,
92, 93, 94 are on the same plane parallel to the central axis C of the power transmission mechanism 2 (on the vertical plane L in the embodiment),
The valve-side passages 91a, 92a, 93a, 94a are parallel to each other, and the pump-side passages 91b, 92
The oil passages 91, 92, 93, and 94 are formed in a generally L-shaped ripple pattern so that b, 93b, and 94b are parallel to each other. In FIG. 1, 1
3 is a bolt hole for fixing the oil pump cover 6, which is formed in the group of the oil passages 91, 92, 93, 94.

In the embodiment constructed as described above, the oil pressure of the control valve 5 is communicated with the oil pump cover 6 via the oil passages 91, 92, 93, 94 formed in the transmission case 1. And these oil passages 91 and 9
Since there is no joint surface in the middle of 2, 93, 94,
There is no risk of oil leakage, and since it is composed of two straight passages, the oil passage length is short and the response is high.

The oil passages 91, 92, 93, 94
The valve side passages 91a, 92a, 93a, 94a and the pump side passages 91b, 92b, 93b, 94b,
Since the holes are formed linearly from the control valve mounting surface 11 and the oil pump cover mounting surface 12, the processing is easy and a structure for closing the holes such as a plug is unnecessary.

The respective oil passages 91, 92, 93, 94 are
The transmission case 1 is formed on the same plane parallel to the central axis C of the power transmission mechanism 2. Generally, the mission case 1 is processed with the central axis C of the power transmission mechanism 2 as a reference. Oil passages 91, 9 based on the same standards as processing
2,93,94 can be processed, and the processing becomes easy. Moreover, when the oil passages 91, 92, 93, 94 are formed on the same plane, the oil passages 91, 92, 93, 94 are formed.
The radial dimension of the space required to form the transmission is small, and the width of the mission case 1 can be reduced. As a result, the weight of the mission case 1 can be reduced.

Since the passages 91a to 94b and 91b to 94b forming the oil passages 91, 92, 93 and 94 are formed in parallel and arranged in an L-shaped ripple, the oil passage 9 is formed.
1, 92, 93, and 94 can be collectively arranged in a small space, which also makes it possible to reduce the weight and size of the mission case 1.

Although the embodiment of the present invention has been described above with reference to the drawings, the specific configuration is not limited to this embodiment. For example, in the embodiment, all the oil passages 91 to 94 are formed in a plane parallel to the central axis C of the power transmission mechanism 2, but at least two of them may be formed on the same plane, This plane does not necessarily have to be a plane parallel to the central axis C.

Further, the valve side passage and the pump side passage forming the oil passage do not necessarily have to be orthogonal to each other, and the valve side passage and the pump side passage may be machined not only by drilling but also by casting. In the case of casting, it is preferable to form it in the same direction as the other casting holes in terms of processing man-hours.

[0023]

As described above, in the oil passage structure of the automatic transmission according to the present invention, the oil passage formed in the case is linearly extended from the mounting surface of the control valve. And the pump-side passage that extends linearly from the mounting surface of the oil pump cover, it is easy to process and has the same effect as the conventional one that no plug is required and the number of parts is small. In addition, there is no oil passage on the joint surface between the case and the other member, there is no risk of oil leakage, and the oil passage length is short and high responsiveness is obtained. Moreover, since at least two of the plurality of oil passages are formed on the same plane, there is an effect that the space required for providing the oil passages can be reduced to reduce the size and weight of the case. can get.

Further, in the oil passage structure of the automatic transmission according to the present invention, the plane on which the central axis of the oil passage is arranged is provided parallel to the central axis of the power transmission mechanism, and the central axis is on the same plane. Since the arranged oil passages are formed so that the valve-side passages and the pump-side passages are orthogonal to each other, and the valve-side passages and the pump-side passages are arranged in parallel with each other, the case of the oil passage The size in the radial direction, that is, the width size can be reduced, and the size in the axial direction can also be reduced. This has the effect of making the case smaller and lighter than the structure according to claim 1. Moreover, since positioning is easy when forming each passage, processing is facilitated, and particularly, continuous processing can be performed at the time of drilling, and excellent workability can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an oil passage structure of an automatic transmission according to an embodiment of the present invention.

FIG. 2 is a partial view showing a mounting surface side of an oil pump cover of a case to which the embodiment structure is applied.

FIG. 3 is a sectional view showing a part of an automatic transmission to which the structure of the embodiment is applied.

[Explanation of symbols]

 1 mission case (case) 11 control valve mounting surface 12 oil pump cover mounting surface 2 power transmission mechanism 5 control valve 6 oil pump cover 91 oil passage 92 oil passage 93 oil passage 94 oil passage 91a valve side passage 92a valve side passage 93a valve Side passage 94a Valve side passage 91b Pump side passage 92b Pump side passage 93b Pump side passage 94b Pump side passage C Central axis

Claims (2)

[Claims] 1. A control comprising: a case for accommodating a power transmission mechanism therein; a control valve attached to the case; and an oil pump cover attached to the case with an attachment surface different from an attachment surface of the control valve. In an oil passage structure of an automatic transmission in which a plurality of oil passages for communicating hydraulic pressure from a valve with an oil pump cover are provided in the case, the plurality of oil passages are linear from the mounting surface of the control valve. It is formed by intersecting the extended valve side passage and the pump side passage linearly extended from the mounting surface of the oil pump cover, and at least two oil passages of the plurality of oil passages are: An oil passage structure for an automatic transmission, characterized in that its central axis is formed on the same plane. 2. The plane in which the central axis of the oil passage is arranged is
The oil passage provided on the plane parallel to the central axis of the power transmission mechanism intersects the valve-side passage and the pump-side passage at a right angle, and the valve-side passages of each oil passage and the pump-side passage are connected. The oil passage structure of the automatic transmission according to claim 1, wherein the oil passage structures are formed by arranging them in parallel.