JP2001115973A - Oil passage structure of oil pump cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil passage structure of an oil pump cover that allows certain press-in of a member without generating unnecessary moment, when the member for blocking a relief valve structured in the oil pump cover. SOLUTION: This oil passage structure of an oil pump cover comprises a transfer oil passage for supplying control oil pressure from a control unit to an in-shaft oil passage of a rotation shaft and to the other oil passages, a drain oil passage for draining oil generated by leak or excessive supply, a long hole formed on the way from an edge of the oil pump cover to the drain oil passage, a seal member pressed into an edge-side opening of the long hole, and a relief valve that is disposed in the long hole, and discharges the oil in the transfer oil passage from the drain oil passage when the oil pressure in the transfer oil passage becomes higher than a predetermined pressure. In the oil passage structure, the long hole is formed radially of the oil pump cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump incorporated in an automatic transmission for a vehicle, and more particularly to an oil passage structure provided in an oil pump cover.

[0002]

2. Description of the Related Art Conventionally, as an oil passage structure formed on an oil pump cover of an oil pump incorporated in an automatic transmission, for example, an oil pump cover described in Japanese Utility Model Laid-Open Publication No. 63-154866 is known. Have been.

As shown in FIG. 14, an oil pump cover 101, a shaft hole 102, and a suction oil passage 103 are provided.
, Discharge oil passage 104, fastening bolt hole 105, drain hole 106, relief valve 107, relay oil passage 1
08. This oil pump cover 1
01 not only serves as a cover of the oil pump, but also controls hydraulic pressure from the control unit to the shaft hole 10.
It can also act as a relay for supplying to the shaft oil passage provided in the rotating shaft passing through the shaft 2 and between the shafts of the hollow double shaft structure and the like.

Further, a relief valve 107 is provided on the oil pump cover 101 in a relay oil passage 108 for supplying a lock-up clutch pressure of the torque converter. Thus, when excessive oil pressure is supplied, the ball valve provided in the relief valve 107 is opened to drain the oil pressure and to avoid damage to the lock-up clutch.

[0005]

However, in the above conventional oil pump cover, the relief valve 1
07 is not formed in the radial direction with the shaft hole 102 as the center. Therefore, when a member such as a ball is press-fitted to close the relief valve 107, a moment is generated due to a difference between the support position of the oil pump cover and the press-fitting direction,
At the same time, the assemblability deteriorates, and the moment causes the oil pump cover to be tilted.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and when press-fitting a member for closing a relief valve formed on an oil pump cover, an unnecessary moment is surely prevented from being generated. It is an object of the present invention to provide an oil passage structure of an oil pump cover that can be press-fitted into the oil pump cover.

[0007]

According to the first aspect of the present invention, an oil pump drive shaft and a rotary shaft having an in-shaft oil passage are disposed at the center, and hydraulic pressure is generated by rotation of the oil pump drive shaft. An oil pump cover for an oil pump, a relay oil passage for supplying control oil pressure from a control unit to an in-shaft oil passage of the rotary shaft and other oil passages, and oil generated due to leakage, excessive supply, etc. A drain oil passage for draining, a long hole formed in the middle of the drain oil passage from an edge of the oil pump cover, a sealing member press-fitted into an edge side opening of the long hole, and And a relief valve that discharges the oil in the relay oil passage from the drain oil passage when the oil pressure in the relay oil passage is equal to or higher than a predetermined pressure, in an oil passage structure of an oil pump cover, Said Holes, characterized in that it is configured in the radial direction of the oil pump cover.

[0008]

In the oil passage structure of the oil pump according to the first aspect, a rotation shaft having an oil pump drive shaft and an in-shaft oil passage is disposed at the center, and the rotation of the oil pump drive shaft causes the hydraulic pressure to be increased. The oil pump cover of the oil pump in which the oil pressure is generated is provided with a relay oil passage for supplying the control oil pressure from the control unit to the in-shaft oil passage of the rotary shaft and other oil passages, thereby causing leakage and excessive supply. There is provided a drain oil passage through which oil generated by the above is drained.

Further, an elongated hole is formed from the edge of the oil pump cover in the middle of the drain oil passage,
A sealing member press-fitted into an edge side opening of the long hole is provided, and is disposed in the long hole, and when oil pressure in the relay oil passage becomes a predetermined pressure or more, oil in the relay oil passage is removed. A relief valve for discharging from the drain oil passage is provided.

At this time, the elongated hole is formed in a radial direction of the oil pump cover.

Therefore, when the sealing member is press-fitted, an unnecessary moment is not generated since the press-fitting direction coincides with the support position of the oil pump cover. Accordingly, the sealing member can be securely press-fitted without being inclined when the sealing member is press-fitted into the oil pump cover.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall configuration diagram of a gear transmission for an automatic transmission according to an embodiment of the present invention. FIG. 2 is a skeleton diagram showing a gear transmission for an automatic transmission according to the first embodiment. In FIGS. 1 and 2, G1, G2,
G3 is a planet gear, M1 and M2 are connecting members, C1 and C
2, C3 are clutches, B1, B2, B3, B4 are brakes, F1, F2, F3 are one-way clutches, IN is an input shaft (input member), and OUT is an output shaft (output member).

The first planetary gear G1 has a first sun gear S
1, a first ring gear R1, and a single pinion type planetary gear having a first carrier PC1 supporting a pinion meshing with both gears S1 and R1.

The second planetary gear G2 has a second sun gear S
2, a second ring gear R2, and a single pinion type planetary gear having a second carrier PC2 that supports a pinion that meshes with both gears S2 and R2.

The third planetary gear G3 includes a third sun gear S
3, a third ring gear R3, and a single pinion type planetary gear having a third carrier PC3 that supports a pinion that meshes with both gears S3 and R3.

The first connecting member M1 is a first carrier.
A member that integrally connects the PC 1 and the third ring gear R3.

The second connecting member M2 is a member for integrally connecting the second ring gear R2 and the third carrier PC3.

The first clutch C1 is a clutch for selectively connecting and disconnecting the first ring gear R1 and the second ring gear R2.

The second clutch C2 includes a second sun gear S
The clutch selectively connects and disconnects the second sun gear S3 with the third sun gear S3. The second clutch C2 is provided with a first one-way clutch F1 in parallel.

The third clutch C3 is connected to a third carrier PC
3 and a clutch that selectively restrains the third sun gear S3.

The first brake B1 is a brake for selectively stopping the rotation of the second connecting member M2.

The second brake B2 is provided with a first sun gear S
This is a brake for selectively stopping one rotation. The second one-way clutch F is connected in parallel to the second brake B2.
2 are provided.

The third brake B3 is provided with a second sun gear S
This is a brake for selectively stopping the rotation of No. 2. The third brake B3 is connected in parallel with the fourth brake B4 and the third brake B4.
A one-way clutch F3 (B4 and F3 are arranged in series with each other) is provided.

The input shaft IN is connected to the first ring gear R1, and inputs the engine rotational driving force via a torque converter (not shown).

The output shaft OUT is connected to the second carrier PC2, and transmits the output rotational driving force to driving wheels via a final gear (not shown).

Each of the clutches C1, C2, C3 and the brakes B1, B2, B3, B4 is provided with an unillustrated shift hydraulic control device (a hydraulic control type, an electronic control type) for generating an engagement pressure and a release pressure at each shift speed. , Hydraulic pressure + electronic control type) are connected.

FIG. 3 is a diagram showing a fastening operation table in the gear transmission for an automatic transmission according to the first embodiment. FIGS. 4 to 9 show the gear transmission for an automatic transmission according to the first embodiment at each speed. It is a figure showing a torque transmission course.

In FIG. 3, .DELTA. Indicates a state related to torque transmission at power-on, C indicates a state related to torque transmission at coasting, and .circle-solid. Supplies hydraulic pressure to the friction element but has no effect on output. State, (○) indicates the engaged state in the overrun mode, (○) ^* indicates the engaged state during selection, and then releases the state except in the overrun mode, and ○ indicates the engaged state. 4 is a torque transmission path at the first speed, FIG. 5 is a torque transmission path at the second speed, FIG. 6 is a torque transmission path at the third speed, FIG. 7 is a torque transmission path at the fourth speed, FIG. 9 shows a torque transmission path at the fifth speed, and FIG. 9 shows a reverse torque transmission path.

FIG. 10 is an enlarged sectional view of the oil pump cover of the embodiment.

The oil pump B is provided between the torque converter A and the transmission C. The impeller shell 1 and the oil pump drive shaft 2 of the torque converter A rotate together with the engine output shaft. The oil pump drive shaft 2 is connected to an inner gear 9 of the oil pump B.

The oil pump B includes an oil pump housing 3, an oil pump cover 4, a shaft stator 7
It consists of. The oil pump cover 4 is fixed to the transmission case 18 by bolts, and the oil pump housing 3 and the oil pump cover 4 are fixed by fastening bolts 5. An outer gear 8 is formed inside the oil pump cover 4 and on the outer periphery of the inner gear 9. An oil seal 6 and a bush 10 are formed between the oil pump housing 3 and the oil pump drive shaft 2. The oil pump cover 4 and the shaft stator 7 are connected by a serration connection.

The oil pump cover 4 and the shaft stator 7 have a torque converter pressure supply oil passage 12, a torque converter pressure discharge oil passage 13, a lock-up clutch pressure supply oil passage 14, a lubrication oil passage 15, and an input clutch pressure supply oil. Relay oil paths (T / C supply relay oil paths 4a, 7a, T / C discharge relay oil paths 4b, 7b, L / L) for supplying control oil pressure from a control unit (not shown) to each oil path of the path 16.
C relay oil passages 4c, 7c, LUB relay oil passages 4d, 7d, I
/ C relay oil passages 4e, 7e).

The shaft 11 is connected to a turbine runner of a torque converter (not shown). This shaft 11
A torque converter pressure discharge oil passage 13 is formed between the shaft converter 7 and the shaft stator 7. Further, the shaft 11 has a lock-up clutch pressure supply oil passage 14, a lubrication oil passage 1
5, three oil passages in the shaft of the input clutch pressure supply oil passage 16 are formed.

FIG. 11 shows the serration connection between the oil pump cover 4 and the shaft stator 7 and the shaft 1.
1 shows an enlarged cross-sectional view of the vicinity of an oil passage provided in 1. As shown in the figure, the shaft stator 7 has a coupling projection 7f, and is serrated by the cover-side serration coupling 4g and the stator-side serration coupling 7g. Further, an oil passage can be formed on a side surface of the coupling projection 7f, which is in contact with the oil pump cover 4. When forming an oil passage in this portion, it is necessary to provide sufficient sealing. Therefore, the cover-side press-fit surface 4h and the stator-side press-fit surface 7h are formed, and the press-fit seal is formed here. This makes it possible to secure the oil passage without extending in the axial direction.

The openings on the surface of the shaft 11 of the three oil passages 14, 15, 16 are respectively provided with seal rings 11
a, 11b, 11c, and 11d. Also, a lock-up clutch pressure supply oil passage 14 is arranged on the engine side, and a lubrication oil passage 15 is arranged at the center,
An input clutch pressure supply oil passage 16 is arranged on the transmission side. In other words, by disposing a relatively low-pressure oil passage in the center portion and disposing a relatively high-pressure oil passage on both sides, the seal rings 11b and 11c not only act on the shaft stator 7 but also on the basis of the differential pressure. The sealing function is ensured by being pressed against the side wall of the groove for the seal ring on the low-pressure oil path side.

FIG. 12 shows an oil pump B according to the embodiment.
13 is a front view as viewed from the transmission side, and FIG. 13 is a sectional view taken along the line ZZ. The relief valve 20 includes an elongated hole 24, a ball valve 21, a spring 22, a sealing member 23, and a drain oil passage 19 communicating with the elongated hole. The elongated hole 24 is formed in the radial direction of the oil pump cover 4 so as to communicate with the L / C oil passage 7c.

Each of the oil passages 4a, 4b, 4c, 4d, 4
"e" is formed by casting when the oil pump cover 4 is cast. Conventionally, after casting an oil pump cover, a plurality of straight holes are formed by a drill or the like, and an oil passage is formed by a combination thereof. Therefore, a plurality of drilling steps are required, and the combination of straight lines causes a low degree of freedom in layout. However,
In recent years, the strength of the casting core can be ensured, and it has become possible to form even a narrow portion such as an oil passage by casting, so that a curved oil passage as shown in the figure can be formed. It is a thing. Therefore, the degree of freedom in the layout of the oil passage is improved, and the number of working steps does not increase even when the relief valve is configured in the radial direction.

Next, the oil pump cover 4 of the present embodiment
The operation of the relief valve 20 will now be described.

First, the shaft hole 4a of the oil pump cover 4
And the periphery thereof is fixed and supported, as shown in FIG.
4, the ball valve 21 and the spring 22 are inserted, and the sealing member 23 is set to the opening at the edge of the long hole. Then, the sealing member 23 is press-fitted by a press-fitting machine. At this time, in the present embodiment, since the press-fit direction is the axial direction which is the oil pump cover support point, no moment or the like is generated even if a force is applied to the oil pump cover 4 during press-fit. . Therefore, since the oil pump cover 4 does not tilt at the time of press-fitting, press-fitting can be performed without causing poor press-fitting.

A drain oil passage 19 is formed in the elongated hole 24 and between the ball valve 21 and the sealing member 23. When an excessive oil pressure is generated in the lock-up clutch pressure supply oil passage 4c, the excessive oil pressure is drained to the drain oil passage 19 by opening the ball valve 21 provided between the oil passage 4c and the elongated hole 24. Is done.

[Operation and Effect of Embodiment] As described above, in the present embodiment, the oil pump drive shaft 2 and the shaft 11 having the in-shaft oil passage are arranged at the center, and the oil pump Control oil pressure from the control unit is applied to the oil pump cover 4 of the oil pump B, which generates oil pressure by the rotation of the drive shaft 2, by the oil passages 14, 15, 16 in the shaft 11 and the other oil passages 12, 13.
Oil passages 4a, 4b, 4c, 4d,
4e and 7a, 7b, 7c, 7d, 7e are provided, and a drain oil passage 19 for draining oil generated due to leakage, excessive supply, or the like is provided.

Further, a long hole 24 is formed from the edge of the oil pump cover 4 to the middle of the drain oil passage 19, and a sealing member 23 is press-fitted into an opening of the long hole 24 at the edge. The relief valve 20 is disposed in the elongated hole 24 and discharges the oil in the relay oil passage 4c from the drain oil passage 19 when the oil pressure in the relay oil passage 4c becomes equal to or higher than a predetermined pressure.

At this time, the elongated hole 24 is formed in the radial direction of the oil pump cover 4.

Therefore, when the sealing member 23 is press-fitted, an unnecessary moment does not occur because the press-fitting direction coincides with the support position of the oil pump cover 4. Accordingly, the sealing member 23 can be securely press-fitted without being inclined when the sealing member 23 is press-fitted into the oil pump cover 4.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an automatic transmission according to an embodiment.

FIG. 2 is a conceptual diagram of an automatic transmission according to an embodiment.

FIG. 3 is an engagement logic table of the automatic transmission according to the embodiment.

FIG. 4 is a diagram illustrating a torque transmission path during one shift of the automatic transmission according to the embodiment.

FIG. 5 is a diagram illustrating a torque transmission path during two shifts of the automatic transmission according to the embodiment.

FIG. 6 is a diagram illustrating a torque transmission path during three shifts of the automatic transmission according to the embodiment.

FIG. 7 is a diagram illustrating a torque transmission path at the time of four shifts of the automatic transmission according to the embodiment.

FIG. 8 is a diagram illustrating a torque transmission path at the time of five shifts of the automatic transmission according to the embodiment.

FIG. 9 is a diagram illustrating a torque transmission path during reverse movement of the automatic transmission according to the embodiment.

FIG. 10 is an enlarged sectional view of an oil pump portion of the automatic transmission according to the embodiment.

FIG. 11 is an enlarged sectional view of a serration coupling portion between the oil pump cover and the shaft stator in the embodiment.

FIG. 12 is a front view of the oil pump according to the embodiment as viewed from the transmission side.

FIG. 13 is a sectional view taken along the line ZZ of the oil pump according to the embodiment.

FIG. 14 is a view showing a conventional oil pump cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impeller shell 2 Oil pump drive shaft 3 Oil pump housing 4 Oil pump cover 4a T / C supply relay oil path 4b T / C discharge relay oil path 4c L / C relay oil path 4d LUB relay oil path 4e I / C relay oil Road 4h Cover-side press-fit surface 4g Cover-side serration connection 4i Suction oil passage 4j Discharge oil passage 4k Shaft hole 5 Tightening bolt 6 Oil seal 7 Shaft stator 7a T / C supply relay oil passage 7b T / C discharge relay oil passage 7c L / C relay oil passage 7d LUB relay oil passage 7e I / C relay oil passage 7f coupling convex portion 7g stator side serration coupling portion 7h stator side press-fit surface 8 outer gear 9 inner gear 10 bush 11 shaft 11a first seal ring 11b second seal ring 11c Third seal ring 11d Fourth seal ring 12 Torque converter Oil supply passage 13 Torque converter pressure discharge oil passage 14 Lock-up clutch pressure supply oil passage 15 Lubrication oil passage 16 Input clutch pressure supply oil passage 17 Torque converter housing 18 Transmission case 19 Drain oil passage 20 Relief valve 21 Ball valve 22 Spring Reference Signs List 23 sealing member 24 long hole 101 oil pump cover 102 shaft hole 103 suction oil passage 104 discharge oil passage 105 fastening bolt hole 106 drain hole 107 relief valve

Claims (1)

[Claims] 1. An oil pump cover for an oil pump, wherein a rotation shaft having an oil pump drive shaft and an in-shaft oil passage is disposed at a center, and an oil pressure is generated by rotation of the oil pump drive shaft. A relay oil passage for supplying the control oil pressure from the oil supply to the in-shaft oil passage of the rotary shaft and other oil passages; a drain oil passage for draining oil generated due to leakage and excessive supply; and the oil pump cover. An elongate hole formed in the middle of the drain oil passage from an edge of the sealing oil member, which is press-fitted into an edge side opening of the elongate hole, and disposed in the elongate hole, and a hydraulic pressure in the relay oil passage is And a relief valve for discharging oil in the relay oil passage from the drain oil passage when the pressure becomes equal to or higher than a predetermined pressure. An oil passage structure of an oil pump cover, comprising: The oil passage structure of the oil pump cover, characterized in that it is configured.