JPH07217724A - Oil pump cover for transmission - Google Patents

Abstract

PURPOSE:To provide a cheap oil pump cover having simple construction so as to be easily manufactured. CONSTITUTION:A cover main body 17 is attached to an end part of a transmission case 11. This cover main body 17 is constituted of an Fe (ferro) material, and it consists of a cover part 19 and a boss part 20. A lubricating oil hole 21, through which lubricating oil flows, is made in the cover part 19. The boss part 20 is positioned within a clutch drum 13, which is arranged to the transmission case 11, while a lubricating oil recessed part communicated with the lubricating oil hole 21 is formed on the outer peripheral part of the boss 20. A sleeve 18 is made up of aluminum alloy die-cast and is attached to the outside of the boss part 20 of the cover main body 17 as an integrated body with the boss part 20. A plurality of lubricating oil grooves, which are communicated with respective lubricating oil recessed parts, and a seal groove, which is formed between each lubricating oil groove and is provided with a sealing ring, are formed on the outer peripheral surface of the sleeve 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump cover for an oil pump applied to a shift control system of an automobile transmission.

[0002]

2. Description of the Related Art Generally, a transmission mounted on an automatic vehicle is adapted to supply lubricating oil supplied from an oil pump to one of the lubricating oil passages through a lubricating oil hole formed in an oil pump cover. A clutch or the like is driven to switch gears. In such a transmission, recently, some members, such as the oil pump cover, have been made of an aluminum alloy die casting for weight reduction.

By the way, the oil pump cover is composed of a lid portion that closes the end face opening of the mission case and a boss portion that fits into the lubricating oil chamber at the end of the mission case. A plurality of lubricating oil holes through which lubricating oil flows are bored from the lid portion to the boss portion, and a plurality of lubricating oil grooves communicating with the respective lubricating oil holes are formed on the outer peripheral surface of the boss portion. In the oil pump cover, a seal groove is formed between the lubricating oil grooves, and a seal ring is arranged in the seal groove to block the flow of the lubricating oil between the lubricating oil grooves.

However, when a soft material is used for the oil pump cover as described above, the seal ring is made of a relatively hard Teflon material, so that the seal groove is worn and the gap between the lubricating oil grooves is increased. Lubrication oil leakage may occur. This leakage of lubricating oil causes a decrease in the oil pressure to the clutch, hinders smooth gear switching, and causes a so-called clutch drag phenomenon.

Therefore, conventionally, the following structure is used.
The seal groove is prevented from being worn by the seal ring to prevent the lubricating oil from leaking. That is, the aluminum alloy forming the oil pump cover 1 is made of a high silicon material (usually the ADC 17 is used) (see FIG. 6), and the oil pump cover 1 is set to the ADC 10 or 1.
2 is formed by casting, and the seal groove 2 is subjected to coating treatment such as alumite treatment, diffric coating, and rubrite treatment (see FIG. 6), and the oil pump cover 1 is cast with the ADC 10 or 12 as described above. And a steel sleeve 3 having a seal groove 2 formed therein instead of coating (see FIG. 7).
And the like) to improve the wear resistance of the seal groove 2 with respect to the seal ring 4 and prevent the lubricating oil from leaking between the lubricating oil grooves 5.

[0006]

However, since the oil pump cover 1 is made of a high silicon material, it cannot be formed by die casting. For this reason, there is a problem that the production cost becomes high because the molten metal forging must be used.

Further, in the oil pump cover 1 described above, it is necessary to control whether or not the coating is reliably formed, that is, the thickness of the thin film formed by the coating process, but this control is very difficult. There is a problem. Also, this coating requires expensive equipment.

Further, in the oil pump cover 1 described above, it is necessary to press-fit the cylindrical sleeve 3 on the outer periphery of the boss portion 1a of the oil pump cover 1, but this boss portion 1a.
A lubricating oil hole 7 is provided in the boss portion 1a, and it is necessary to prevent the boss portion 1a from being damaged by press fitting / fitting of the cup plug 6 that seals the end portion of the lubricating oil hole 7. Therefore, there is a problem in that the outer diameter of the boss portion 1a becomes large and the layout of the transmission must be changed. In view of the above problems, an object of the present invention is to provide an inexpensive oil pump cover that can be easily manufactured with a simple structure.

[0009]

In order to achieve the above-mentioned object, the present invention has an oil pump cover attached to an end portion of a transmission case which constitutes an outer frame of a transmission, and a lubricating oil supplied from an oil pump is provided. A lid portion having a plurality of flowing lubricating oil holes, and a plurality of lubricating oil concave portions located in the clutch drum provided in the mission case and communicating with the lubricating oil holes are formed on the outer peripheral portion. Cover body made of an aluminum alloy die cast with a boss portion formed on the cover body, and a boss on the cover body.
It is made of Fe material that is integrated and has a plurality of lubricating oil grooves formed on the outer peripheral surface thereof and communicating with the respective lubricating oil recesses, and a sealing groove formed between the respective lubricating oil grooves and in which a seal ring is disposed. It is composed of a sleeve.

[0010]

According to the above construction, the lubricating oil leak between the lubricating oil grooves is prevented by the seal ring arranged in the seal groove of the sleeve. However, since the sleeve is made of Fe material, the seal ring prevents Is hard to wear. Further, even if the temperature rises, the sleeve is made of a material having a thermal expansion coefficient smaller than that of the cover main body, so that the fitting portions of the both act in the tightening direction.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the transmission, and the rotation torque of the engine (not shown) is the transmission case 11
It is transmitted via a torque converter 12 arranged at one end side of the inside, and is automatically shifted by each clutch 14 provided at a clutch drum 13 arranged at the other end side of the transmission case 11.

An oil pump 15 is attached to the end of the mission case 11. Oil pump 15
And the clutch drum 13 provided in the mission case 11
Is separated by an oil pump cover 16, and by supplying lubricating oil to one of the clutches 14,
You can switch gears.

The pump cover 16 includes a cover body 17
And a sleeve 18. The cover body 17 includes a lid portion 19 that closes the end portion of the mission case 11, and a boss portion 20 that is fitted and integrated in the center hole of the lid portion 19 and that is located inside the clutch drum 13. As shown in FIG. 4, the lid portion 19 is provided with a plurality of lubricating oil holes 21, and the boss portion 20 has a plurality of lubricating oil holes 21.
As shown in FIG. 5, a plurality of lubricating oil recesses 22 are formed corresponding to the respective lubricating oil holes 21 in the range of a predetermined angle in the circumferential direction, and each lubricating oil hole 21 and each corresponding lubricating oil recess 22 are respectively formed. It is communicated through the communication hole 23.

The cover body 19 is made of an aluminum alloy such as ADC1 (Si; 12%) and ADC3 (S).
i; 9.5%, Mg; 0.5%), ADC5 (Mg; 6)
%), ADC6 (Mg; 3%, Mn; 0.5%), AD
C10 (Si; 8.5%, Cu; 3%), ADC12
(Si; 11%, Cu; 2.5%) and the like are manufactured by the die casting method. In this case, the communication hole 23 is formed in the lubricating oil concave portion 2 formed on the outer peripheral surface of the boss portion 20 with a predetermined draft.
Since it is formed so as to communicate with No. 2, no post-processing is required. Therefore, the surface of the manufactured cover body 17 is in a cast surface state, which is very preferable in terms of the flow state of the lubricating oil. Further, as in the conventional example shown in FIG. 6 or 7,
Since it is not necessary to form a lubricating oil hole 7 into which a sealing member 6 such as a cup plug or a steel ball is fitted at the boss end of the cover body 1, it can be manufactured at low cost.

The sleeve 18 is composed of the cover body 17
It is externally integrated with the boss portion 20 of. The sleeve 18 is made of an Fe material, for example, an Fe-C alloy, an Fe-based alloy, or the like (in this embodiment, S45C is used).
It has a cylindrical shape, and a plurality of lubricating oil grooves 24 are formed on the outer peripheral surface corresponding to the lubricating oil holes 21. This sleeve 1
In FIG. 8, a communication hole 28 penetrating from the outer peripheral lubricating oil groove 24 to the inner periphery is lowered before being fitted / integrated with the boss portion 20 of the cover body 19, and fitted / integrated. After the lubrication, each lubricating oil recess 22 and the lubricating oil groove 24 are communicated with each other. In this embodiment, each of the lubricating oil recesses 22 is
Is formed by cutting the outer peripheral surface of the boss portion 20 of the cover 17, and by setting the outer diameter of the boss portion to 36.6 mm and the cutting depth to 1.5 mm, a cross-sectional area corresponding to a hole with a diameter of 4 mm is obtained. have. Further, a seal groove 25 is formed between the lubricating oil grooves 24, and each seal groove 25
By arranging the seal ring 26 in the above, when the oil pump cover 16 is attached to the mission case 11, the leakage of the lubricating oil between the respective lubricating oil grooves 24 is prevented.

In the pump cover 16 having such a structure,
By being attached to the mission case 11, the boss portion 20 into which the sleeve 18 is fitted is fitted and positioned in the clutch drum 13. Therefore, the lubricating oil hole 2
The lubricating oil that has flowed in through 1 can be supplied to the desired clutch 14 from each lubricating oil passage 27 formed in the clutch drum 13 of the transmission case 11 via the communication hole 23, the lubricating oil recess 22, and the lubricating oil groove 24. The hydraulic pressure in the clutch 14 is adjusted and the gears are switched.

In this case, the sleeve 18 is made of Fe, which is harder than the aluminum alloy die casting, as described above.
Since the seal groove 25 is made of a material, the seal groove 25 is less likely to be worn by the seal ring 26 made of a Teflon material, and the lubricating oil leakage is effectively prevented.

When the temperature of the pump cover 16 becomes higher, the sleeve 18 made of Fe material has a smaller thermal expansion coefficient than the cover body 17 made of aluminum alloy.
However, since the pump cover 16 is covered with the boss portion 20 of the pump cover 16, it is possible to prevent the lubricating oil from leaking at the fitting portion between them (in the present embodiment, the difference in thermal expansion between both members is 10 to 11 × 10).
^-6 / ° C). In addition, in the design stage, the tolerance of the fitting portion can be a normal interference fit tolerance (hole H7, shaft n6), and can be easily integrated by press fitting.

[0019]

As is apparent from the above description, according to the oil pump cover of the present invention, the lubricating oil concave portion communicating with the lubricating oil hole formed in the cover body made of the aluminum alloy die casting is formed on the outer periphery of the boss portion. On the other hand, while forming, a sleeve made of Fe material is externally integrated with this boss,
Since the lubricating oil groove and the seal groove are alternately formed on the outer periphery of the lubricating oil groove, the thickness of the boss portion can be reduced and the weight can be reduced, and the wear resistance of the seal groove can be improved to improve the lubricating oil groove. It is possible to reliably prevent the leakage of the lubricating oil between them.

Moreover, even if the temperature of the oil pump cover rises, since the sleeve is made of a material having a smaller coefficient of thermal expansion than the cover body, no gap is created in the fitting portion between the two. Lubricating oil leakage from the fitting portion is effectively prevented.

[Brief description of drawings]

FIG. 1 is a partially sectional front view of a transmission according to this embodiment.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is a partially sectional front view of the oil pump cover of FIG.

FIG. 4 is a right side view of FIG.

5 is a partial cross-sectional view of FIG.

FIG. 6 is a partial cross-sectional view of an oil pump cover according to a conventional example.

FIG. 7 is a partial cross-sectional view of an oil pump cover according to another conventional example.

[Explanation of symbols]

11 ... Mission case, 13 ... Clutch drum, 16
… Pump cover, 17… Cover body, 18… Sleeve,
19 ... Lid part, 20 ... Boss part, 21 ... Lubricating oil hole, 22 ... Lubricating oil recess, 24 ... Lubricating oil groove, 25 ... Seal groove, 26 ... Seal ring.

Claims (1)

[Claims] 1. A lid part, which is attached to an end part of a transmission case that constitutes an outer frame of a transmission and has a plurality of lubricating oil holes through which lubricating oil supplied from an oil pump flows, and the mission case. A cover main body made of an aluminum alloy die-cast which is located inside a clutch drum and has a boss portion having a plurality of lubricating oil recesses formed in the outer peripheral portion and communicating with the respective lubricating oil holes; A plurality of lubricating oil grooves which are externally integrated with the boss portion and communicate with the respective lubricating oil recesses on the outer peripheral surface, and a seal groove which is formed between the respective lubricating oil grooves and in which a seal ring is disposed are formed. An oil pump cover for a transmission, characterized by comprising a sleeve made of Fe material.