JPH0686903B2 - Oil pump housing manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a housing of an oil pump mainly used in an automatic transmission for vehicles.

[Prior Art] In an automatic transmission for a vehicle, an oil pump body made by casting iron or aluminum alloy is machined on one surface, is cast by iron or aluminum alloy, and is oil machined on the joint surface. An oil pump in which gears such as a pump, a vane pump, and a rotor pump are fitted in a housing in which a pump cover is joined by fastening is used. Further, the oil pump body or the oil pump cover is used as a support member for a clutch, a brake, a planetary gear set or the like. Therefore, a hydraulic oil supply oil passage and a lubricating oil supply oil passage are formed inside the oil pump body or the oil pump cover. At this time, an oil passage is formed by a drill or the like from the joining surface between the oil pump body and the oil pump cover toward the inside of the member due to the problem of workability. After forming the oil passage, a plug must be plugged to close the hole on the joint surface between the oil pump body and the oil pump cover. Therefore, for example, as described in Japanese Utility Model Laid-Open No. 58-79163, there is a method of press-fitting a hard sphere. Further, in the process of assembling, from the viewpoints of preventing the occurrence of defects due to burrs and the like that occur during processing and improving productivity, it is common to produce the individual parts in the order of assembling after processing. Conventionally,
Even when the plug is press-fitted into the joint surface between the oil pump body and the oil pump cover, the plug is press-fitted after the joint surface is subjected to flattening by grinding or cutting.

[Problems to be Solved by the Invention] As a method of sealing the joint surface between the body of the oil pump and the cover, the sealing is performed by the close contact between the surface-processed surfaces without using a sealing material. Therefore, it is difficult for the conventional method to reliably make the rear end surface of the stopper and the flattened joint surface flush with each other. When the plug press-fitting portion is a convex portion, the joint surfaces are not in close contact with each other and are not completely sealed, which may cause oil leakage. Further, even when the plug press-fitting portion is a recess, there is a problem that the discharge pressure of the oil pump easily causes oil to leak from the joint surface between the oil pump body and the oil pump cover through the recess. Further, the oil accumulated in the recess causes cavitation (vortex winding) due to the rotation of the pump gear, and the cavitation causes the oil to scrape the wall of the hole, and the hole expands, and the oil leaks from the expanded hole and the oil pump May not function.

An object of the present invention is to surely form the rear end surface of the stopper and the flattened joint surface of the oil pump cover or the oil pump body on the same plane, and thereby to form the flat surface on the joint surface of the oil pump body and the oil pump cover. It is a method for manufacturing an oil pump housing that can reduce oil leakage and can reliably prevent the occurrence of oil cavitation.

[Solution] To achieve the above object, the present invention adopts the following configurations.

That is, an oil passage is formed from the joint surface between the oil pump body and the oil pump cover toward the inside of the oil pump cover, and an opening at the joint surface of the oil passage is formed on the sliding surface of the oil pump gear. In a method for manufacturing an oil pump housing, which is assembled by joining the respective jointed surfaces of the body and the oil pump cover, which have been subjected to planar processing, a step of press-fitting a plug into a hole for an oil passage opened in the jointed surface, A method of manufacturing an oil pump housing, comprising the step of press-fitting the plug in the step and then flattening the joint surface.

In the method of manufacturing the oil pump housing of the present invention, it is preferable that the oil pump cover and the plug are manufactured from the same material.

[Advantageous effects] The present invention having the above-described configuration provides the plug protruding from the hole when the joint surfaces of the oil pump body and the oil pump cover are machined flat after the plug is press-fitted into the hole. At the same time, the rear end portion is also flattened. Therefore, the joint surface between the oil pump body and the oil pump cover can be surely formed on the same plane, and oil leakage from the joint surface can be reduced. Further, since the rear end processed surface of the plug fills the entire surface of the hole, the effect of preventing oil leakage from the joint surface is great.

EXAMPLES Next, the present invention will be described based on the examples shown in the drawings.

The automatic transmission is composed of a fluid transmission device (torque converter in this embodiment) 200, a transmission 300, and a hydraulic control device 400.

Transmission 300 is the first planetary gear set p
1, one multi-plate clutch C operated by hydraulic servo
0, an overdrive planetary gear transmission 10 including one multi-disc brake B0 and one one-way clutch F0;
2nd planetary gear set p2, 3rd planetary gear set p3, two multi-plate clutches operated by hydraulic servo
C1, C2, one belt brake B1, two multi-disc brakes
Underdrive planetary gearbox 40 with B2, B3 and two one-way clutches F1, F2
Composed of and.

The case of the automatic transmission includes a torque converter housing 120 that accommodates the torque converter 200, a tubular portion 40A that accommodates the overdrive planetary gear transmission 10 and the underdrive planetary gear transmission 40 in series, and a lower crocodile. It consists of a transmission case 130 having a control mechanism chamber 40B integrally cast, and an extension housing 140 that covers the rear side of the automatic transmission 100. These torque converter housing 120 and transmission case 1
The extension housing 140 and the extension housing 140 are fastened with a large number of bolts so as to have a coaxial center.

The torque converter 200 is housed in the torque converter chamber 121 of the torque converter housing 120 whose front (engine side) is open, and is welded to the front cover 111 connected to the input shaft of the torque converter 200, and the outer periphery of the front cover 111. An annular plate-shaped rear cover 112, the rear cover 1
Pump impeller 205, which is provided around the inner wall of the inner wall surface of 12,
A turbine runner 206 arranged to face the pump impeller 205, a turbine shell 207 holding the turbine runner 206, a stator 201 supported by a fixed shaft 203 via a one-way clutch 202, and the front cover 111. A direct coupling clutch (lock-up clutch) 113 that directly couples the turbine shell 207 with the turbine shell 207 is provided.

The torque converter chamber 121 and the transmission chamber of the tubular portion 40A of the transmission case 130 that is continuous behind the torque converter chamber 121.
Between 132, the oil pump gears 501 and 503 are housed inside, and at the center, there is a tubular portion 52 that projects forward (toward the torque converter), and the rear surface is subjected to planar processing by grinding, Joint surface with the oil pump cover described later
An oil pump body 51, which is designated as 51A, is fitted into the front end face of the transmission case 130 by a plurality of bolts and is fastened with a plurality of bolts. The rear side (transmission side) of the oil pump body 51 has the cylindrical portion. Cylindrical front support 53 that has a coaxial core with 52 and projects rearward
The front surface of the oil pump body is subjected to flattening by grinding, and the oil pump cover 54 serving as the joint surface 54A with the joint surface 51A of the oil pump body is fastened with a plurality of bolts. The oil pump body 51 and the oil pump cover 54
The oil pump housing 5 constitutes a partition wall between the torque converter chamber 121 and the transmission chamber 132 and also serves as a front support wall of the transmission 300. In the present embodiment, a crescent type gear pump is used as the oil pump 5, 501 is an outer (inner tooth) gear, 503 is an inner (outer tooth) gear, and 505 is a crescent protruding from the oil pump body. Reference numerals 507 denote suction ports, all of which are provided at predetermined positions of the oil pump body 51.

The oil pump cover 54 is manufactured by casting of iron or aluminum alloy and has a substantially disc shape. Inside, a hydraulic oil supply oil passage 55 for the hydraulic servo C-0 is provided by casting or drilling. There is. The oil passage 55 has a radial hole A into which a rigid ball 56 is press-fitted as a blind plug at the end of the opening, and an axial hole formed to the inside of the front support 53 formed from a joint surface 54A with the oil pump body. B and a tip end of the axial hole B and a radial hole C that connects the hydraulic servo C-0 rotatably supported by the front support 53. Reference numeral 6 is a blind plug made of a solid columnar body made of iron or aluminum and press-fitted into the open end of the axial hole B. The blind plug will be described with reference to FIG. 1. The oil pump body is joined by a joining surface which is processed to be flat.
In the oil pump housing consisting of 51 and the oil pump cover 54, the oil pump cover 51 or the oil pump body 54 has a hole B having an opening at the joint surface 54a before the flattening and having the stopper 6 press-fitted into the opening. However, the stopper 6 has a rear end 6A in the hole B as shown in FIG.
Is pressed out so as to be in a protruding state or in the same plane, and then the rear end 6A of the plug 6 is simultaneously processed when the joint surface 54A is processed to be flat, and the flat joint surface 54 shown in FIG.
It is formed in a shape having A.

In this case, even if the rear end 6A of the stopper 6 and the joint surface 54a before flattening are in the same plane after press-fitting, or even if the rear end 6a is somewhat in the hole B, the grinding amount at the time of flattening can be adjusted accordingly. It is natural that it should be increased by Thus, the oil pump body 51 or the oil pump cover 54 and the plug 6
By using the same material made of iron or aluminum for both and, it is possible to prevent the generation of gaps due to the difference in the coefficient of thermal expansion or the reduction in the flatness due to the difference in the wear resistance.

The oil pump body 51 of the oil pump cover 54
Is formed at a predetermined position in the vicinity of the press-fitting position of the rigid sphere 56 on the joint surface 54A with the diameter of the hard sphere 56, and escapes the swelling of the joint surface 54A of the oil pump cover 54 caused by the press-fitting of the hard sphere 56, A chamfer 57 is provided to prevent the bulge from protruding from the main plane of the joint surface 54A. The meat removing portion 57 maintains the joining property between the oil pump body 51 and the oil pump cover, and effectively prevents an increase in oil leakage from the joining surface due to fastening. In addition, since the hard sphere 56 can be used as a ball bearing as it is, it is low in cost, and since it has no directionality, it does not cause tilt press-fitting and is suitable for automation. It is also extremely strong and excellent in sealing property and durability.

An intermediate partition wall 159 having a cylindrical center support 158 that projects rearward is provided in the middle of the transmission chamber 132 so as to partition the overdrive mechanism chamber 133 and the underdrive mechanism chamber 134. A rear support wall 157 having a cylindrical rear support 156 protruding forward is provided in the rear portion. A transmission chamber 132 is formed between the partition wall 155 and the rear support wall 157,
An output shaft chamber 141 of the transmission is formed between the rear support wall 157 and the extension housing 140, and an electronically controlled sensor rotor 143 and a speedometer drive gear 144 are fixed to the output shaft in the output shaft chamber 141. A sleeve yoke (not shown) coaxial with the front support 153 is inserted and spline-fitted to the rear end of the output shaft.

Inside the front support 153, a fixed shaft of the one-way clutch 202 that supports the stator 201 of the torque converter 200.
The torque converter 203 is fitted to the inside of the fixed shaft 203.
An input shaft 11 of the transmission, which is an output shaft of 200, is rotatably supported. The input shaft 11 has a large-diameter rear end portion 12 with a flange portion 12a behind the front support 153, and a rearward facing center hole 13 is formed at the center of the rear end portion 12. Behind the input shaft 11, an intermediate transmission shaft 14 arranged in series with the input shaft 11 is rotatably mounted. The tip of the intermediate transmission shaft 14 is slidably contacted with the center hole 13 to form an intermediate transmission. axis
The rear end portion 14 has a large diameter, and a rearward facing center hole 16 with which the front end of the output shaft 36 slides is formed at the center. Output shaft 36
Is spline-fitted to a flange plate 82 having an outer periphery that meshes with the ring gear of the third planetary gear set p3 and has a shaft support 81 protruding rearward, and a rear portion 38 to spline-fit with the sleeve yoke. ing.

The transmission 300 has a transmission case 130 depending on vehicle driving conditions such as vehicle speed and throttle opening.
Engagement of each clutch and brake by the hydraulic pressure selectively output from the hydraulic control device 400 in the valve body 403 built in the oil pan 401 fastened to the lower part of the Alternatively, the gear is released, and four forward gear shifts or one reverse gear shift is performed.

[Brief description of drawings]

1 (1) and 1 (2) are sectional views showing a method for processing an oil pump cover according to an embodiment of the present invention, and FIG. 2 is a sectional view of an automatic transmission for a vehicle adopting the oil pump housing of the present invention. 3 and 4 are enlarged views of the main part of FIG. In the figure, 1 ... Oil pump housing, 6 ... Stopper, B ...
Hole, 51 …… Oil pump body, 54 …… Oil pump cover, 51A, 54A …… Joint surface

Front Page Continuation (72) Inventor Yutaka Toyaga 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Kazuaki Watanabe 1 Toyota Town, Toyota City, Aichi Toyota Motor Co., Ltd. Masaya (56) Bibliography Sho 58-79163 (JP, U) Sho 55-18973 (JP, U)

Claims (2)

[Claims] 1. An oil passage is formed from a joint surface between an oil pump body and an oil pump cover toward the inside of the oil pump cover, and an opening at the joint surface of the oil passage is formed on a sliding surface of an oil pump gear. In a method for manufacturing an oil pump housing, which is assembled by joining the jointed surfaces of the oil pump body and the oil pump cover, which have been subjected to planar processing, a plug is press-fitted into an oil passage hole opened in the jointed surface. A method for manufacturing an oil pump housing, comprising: a step; and a step of press-fitting the plug in the step, and then flattening the joint surface. 2. The method for manufacturing an oil pump housing according to claim 1, wherein the oil pump cover and the plug are manufactured from the same material.