JP2002070753A - Oil pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a weight of an oil pump body preventing erosion by a cavitation. SOLUTION: The oil pump comprises a pump gears 1A and 1B, a pump body 2 substantially as thick as they and housing a pump gear in a light metal made gear chamber penetrating to a thickness direction and a first and second iron made members 3, 4 attached to the both sides thereof. Since the pump body is lightweight due to light metal and only a part contact with the pump gear is made of iron, durability against erosion by a cavitation is retained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump,
In particular, the present invention relates to a gear oil pump incorporated in a transmission.

[0002]

2. Description of the Related Art An automatic transmission is provided with an oil pump for circulating hydraulic oil for automatic transmission for control of a hydraulic servo and a torque converter and for lubrication. Such an oil pump is arranged to also serve as a partition of a case opening that separates the transmission case and the torque converter housing. This type of oil pump is generally constituted by a gear pump, and includes a pump body having a pump chamber for accommodating a pump gear, and a pump cover for covering an opening-side end face of the pump chamber. A typical example of an oil pump having such a configuration is disclosed in
There is a technique disclosed in JP-A-315790.

[0003]

When a pump body and a cover made of cast iron are used to seal the opening of the transmission case with the pump body, an iron pump is required to be mounted on the transmission case. There has been a problem that the body becomes larger in diameter and the transmission becomes heavier. If the pump body is simply made of light metal such as aluminum to cope with this increase in weight, erosion due to cavitation occurring on the side of the pump body and the cover that hits the side surface of the pump gear will progress faster, and the pump body will last longer. Worse.

[0004] In view of such circumstances, an object of the present invention is to reduce the weight of an oil pump while ensuring durability against erosion due to unavoidable cavitation in a pump body and a cover.

[0005]

In order to solve the above-mentioned problems, an oil pump according to the present invention has a pump gear and a pump gear chamber having substantially the same thickness as the pump gear and housed in a pump gear chamber penetrating in the thickness direction. A first pump body made of light metal, and a first pump body attached to both sides of the first pump body.
And a second iron member.

In the above structure, a second pump body made of light metal is provided on one side of the first pump body, and the first iron member comprises the first pump body and the second pump body. An iron plate is provided between the bodies, the second iron member is a pump cover, and at least one of the first pump body and the second pump body seals the opening of the transmission case. It is effective to adopt a configuration.

Further, in the above configuration, it is effective that the second pump body has a configuration having a plurality of oil passages.

Further, in the above structure, it is effective that the iron plate has a plurality of holes communicating the oil passages of the first pump body and the second pump body.

[0009] It is also possible to adopt a configuration in which a hydraulic servo of a transmission is incorporated in the first pump body.

[0010] In the above structure, the second pump body has a contact portion radially in contact with an opening of the transmission case on an outer peripheral portion thereof, and a fluid transmission device on an inner peripheral portion. It is also effective to have a support portion for supporting the transmission case via a bush, and to fasten the transmission case to the transmission case by fastening means.

The contact portion has an extending portion extending in the direction of the first pump body and overlapping the first pump body in the axial direction, and a seal ring is disposed on the extending portion. It is also effective to adopt a configuration provided.

[0012] It is also effective to provide a structure in which an outer peripheral portion of the first pump body has a support portion which comes into contact with an opening of the transmission case in a radial direction.

It is also effective that the iron plate has substantially the same diameter as the surface of the first pump body on the side of the second pump body.

[0014]

According to the structure of the first aspect of the present invention, the weight of the oil pump can be reduced by making the first pump body made of light metal. In addition, since the iron members are arranged on both sides of the first pump body, erosion due to cavitation can be suppressed, and the durability of the pump body does not deteriorate. In addition, a pump gear chamber penetrating in the axial direction is provided in the first pump body, and iron members are arranged on both sides of the first pump body, so that the pump gear chamber is defined by the first pump body and the iron member. When the pump gear chamber is provided as a recess in the pump body as in the configuration described above, the centering process is performed by a cutter. Therefore, the accuracy of the depth of the recess and the parallelism between the mating surface of the recess bottom and the pump cover are increased. On the other hand, in the configuration in which both ends of the pump gear chamber are defined by the first pump body itself as in the present invention, since the end face is processed, the thickness and the parallelism are relatively determined by polishing or the like. Since the precision can be easily improved, the processing for making the pump gear chamber highly accurate becomes easy.

According to the second aspect of the present invention, the oil pump as a large-diameter part necessary for sealing the opening of the transmission case can be made of light metal, so that the automatic transmission can be reduced in weight. .

According to the third aspect of the present invention, the pump body conventionally formed integrally can be divided into two parts.
The complicated three-dimensional oil passage for clutches, brakes, etc. can be formed as a simple planar groove divided by a plate between both pump bodies, so that the pump body can be formed without using a core Thus, a pump body which conventionally requires casting processing can be manufactured by die-cast molding, and higher precision and cost reduction can be achieved as compared with a cast product.

Further, according to the structure of the fourth aspect, the oil passages provided in each of the two divided pump bodies can be communicated at appropriate locations by the oil passages of the iron members therebetween, so that the suction, Numerous oil passages for discharge, clutch, brake, etc. are distributed in two pump bodies,
Many oil passages can be arranged while maintaining the strength of the pump body.

Next, according to the configuration of the fifth aspect, the connection of the oil passage to the hydraulic servo incorporated in the pump body can be realized with a simple oil passage structure that does not complicate the arrangement of the oil passage.

According to the sixth aspect of the present invention, since the fluid transmission can be supported by the transmission case only through the second pump body, the centering accuracy of the fluid transmission with respect to the transmission case can be improved. it can.

In the above configuration, the seal between the transmission case and the second pump body is provided at the extending portion that overlaps the first pump body in the axial direction. The axial length of the pump can be reduced.

Further, in the structure according to the eighth aspect, since the first pump body is directly supported on the transmission case without intervening another member, the centering accuracy of the first pump body is improved. Can be.

According to the ninth aspect, the iron plate has substantially the same diameter as the first pump body.
Since there is no need to provide a recess for fitting the iron plate in the first pump body, the processing is facilitated.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an oil pump according to an embodiment of the present invention, together with an automatic transmission incorporating the oil pump. In the drawings, hatching is omitted from other portions for clarifying the shape of the oil pump. As shown in FIG. 1, the oil pump includes a drive gear 1A composed of an external gear, a pump gear composed of a driven gear 1B composed of an internal gear that eccentrically engages internally, and pump gears 1A and 1B. A first pump body 2 made of a light metal made of aluminum, magnesium, or an alloy thereof for accommodating the pump gears 1A, 1B in a pump gear chamber having substantially the same thickness and penetrating in the thickness direction; And first and second iron members 3 and 4 attached to both sides of the first iron member. Furthermore,
On one side of the first pump body 2, a second pump body 5 made of light metal made of aluminum, magnesium, or an alloy thereof is disposed.

The first iron member 3 is an iron plate arranged between the first pump body 2 and the second pump body 5, and the second iron member 4 is a pump cover made of a casting. Have been. The oil pump is incorporated in an automatic transmission, and at least one of the first pump body 2 and the second pump body 5 (both in the present embodiment) seals the opening of the transmission case 10. I have. The first pump body 2 has a hydraulic servo 6 for the transmission.
Is incorporated.

The second pump body 5 has a contact portion 5a on its outer peripheral portion which radially contacts the opening of the transmission case 10, and a fluid transmission device 8 comprising a torque converter on its inner peripheral portion. Of the transmission case 10 via a bush 9 and is fastened to the transmission case 10 by fastening means 7 composed of bolts. The contact portion 5a has an extension 5c that extends in the direction of the first pump body 2 and overlaps with the first pump body 2 in the axial direction. A seal ring 51 made of an O-ring is provided on the extension 5c. It is arranged. Also, the first
A support portion 2a is provided on the outer peripheral portion of the pump body 2 so as to radially contact the opening of the transmission case 10. The iron plate 3 has substantially the same diameter as the surface of the first pump body 2 on the second pump body 5 side.

The second pump body 5 has a plurality of oil passages A _{5 to} K ₅ as shown in FIG. On the other hand, as shown in FIG. 3, the iron plate 3 has a plurality of holes A _{3 to} K ₃ and A ′ ₃ to communicate the oil passages of the first pump body 2 and the second pump body 5.
With a K _'3.

More specifically, the first pump body 2
Fig. 2 is a plan view from the mating surface side with the pump cover
As shown in FIG.
It has a disk shape with an outer diameter corresponding to the
Pump chamber in which the driven gear 1B is rotatably fitted.
Large diameter hole (hereinafter, in the description of the embodiment,
21), which penetrates in the thickness direction.
Aluminum die-cast products. And this port
The oil is located approximately at the center between the pump gear chamber hole 21 and the outer diameter of the body.
The annular cylinder groove 22 that composes the pressure servo cylinder is shaped
Has been established. Pump body outer diameter 21 and cylinder groove 22
In the middle part sandwiched by _Two~ K_TwoNoso
Mainly each inlet opening and bolt 7 (see Fig. 1)
Ten bolt through holes 23A and two knock pins
A hole 24 is arranged. In addition, these many oil passages
Regarding each role and the communication relationship with the oil passage of other members,
It will be described later. In addition, the bolt through hole 23A and the knock
The cupin hole 24 can be easily distinguished from the oil passage hole.
The bolt and the knock pin are inserted
Hatching in the same direction showing their cross-sections (other
The same applies to the bolt screw holes) and symbols.
In addition, the openings including these oil passages and the bolt holes 23
There is also a lightening 25 for weight reduction, avoiding A
I have. Sandwiched between the cylinder groove 22 and the pump gear chamber hole 21
In the middle part, the same applies to each of the many oilways.
Outlet opening, six bolt screw holes 23B, and nine bolt holes.
23C screw holes and lightening 25 for weight reduction
Have been. In addition, three cylinders provided in the cylinder groove 22
Of the holes at the place, the hole indicated by reference numeral 26 is a hydraulic servo cylinder.
(Fig. 1)
Guide hole for fitting), the other two supply hydraulic pressure
Oil passage hole.

Each oil passage formed in the first pump body 2
Holes on the outer and inner circumferential sides of the cylinder groove 22
And are arranged in the circumferential direction. First, exceptionally
A generally rectangular oil formed straddling the back side of the cylinder groove 22
Oil pump suction hole A _TwoMeans that both ends
Open to the mating surface side with the cover and straddle the cylinder groove 22
A single hole with a part opened on the mating surface side with the iron plate 3
Have been. Next, a generally rectangular discharge hole adjacent to this
B_TwoIs open on the mating surface side with the pump cover.
And the inner surface slightly more than that is the mating surface with the iron plate 3.
It is a single step hole that opens to the side.

In the clockwise direction, three substantially rectangular torque converter oil passage inlet holes C _{2 to} E ₂ arranged in the circumferential direction on the outer peripheral side are formed with a stepped hole similar to the discharge hole B ₂ and an inner hole. Three circular outlet holes C 'arranged side by side with bolt holes around
There is a hole forming a ₂ to E _'2 respectively pairs. Hole F ₂ of generally rectangular adjacent to these are the brake test hole which is similar to a single stepped hole and discharge hole B _2.
This hole has a paired relationship with a circular outlet hole F ′ ₂ formed at the bottom of the cylinder groove 22. The next generally L-shaped hole G
₂ is a breather hole, and this hole is a hole G ₂ on the outer peripheral side which is composed of a combination of a stepped hole and a circumferential groove connected thereto,
Central portion have the relationship that forms the inner periphery of the hole G _'2 pair which is a composite of the arc-shaped groove opened to the mating surface of the iron plate 3. Long holes H ₂ to the next in the circumferential direction is a hole of the lubricating oil road, the hole, the a similar uneven hole, it is wider mating surface side of the lead iron plate 3, a middle 2
The mating surface side with the pump cover reinforced with one rib is an inlet hole composed of a composite of narrow arc holes.
The inlet hole H ₂ is a circular outlet hole H ′ ₂ on the inner peripheral side.
There is a paired relationship. Uneven hole I ₂ of generally rectangular similar to the following wherein is a clutch oil passage hole, the inlet hole I ₂
I am in a relationship also form inner circumferential side of the circular exit hole I _'2 pair.
Uneven hole J ₂ of generally rectangular similar to the following wherein is a brake fluid passage holes, the inlet holes J ₂ is, in relation to forming the exit hole J _'2 a pair of circular, which is formed in the cylinder groove 22 bottom is there. Generally rectangular stepped hole K ₂ similar to the last of the are other clutch fluid passage holes, the inlet holes K ₂ forms a circular outlet hole K _'2 and pairs of inner circumference side. Reference numeral L ₂ denotes a drain hole of the oil seal.

Next, as shown in FIG. 3, the flat shape of the iron plate 3 as viewed from the mating surface side with the first pump cover is that of the first pump body 2 on the side where the iron plate 3 is attached. The outer diameter is substantially the same as the outer diameter of the thin disk,
The center portion has a shaft through-hole 31 through which a comb-shaped engaging portion of the inner hub shaft of the pump impeller of the torque converter is inserted.
The holes provided in the iron plate 3 are all holes penetrating the plate 3 with a uniform cross section in the thickness direction, and oil passage holes A _{3 to} K ₃ , A ′ ₃ among them. ~K _'3 is,
A connecting communication hole is formed between the openings of the first and second pump bodies 2 and 5, and the screw holes 33B and 33C for bolts are aligned with the bolt screw holes of the first and second pump bodies 2 and 5. It is a screw hole. In this case the code L ₃ also shows the drain hole of the oil seal.

Each of the oil passages formed in the iron plate 3 has an outer peripheral side and an inner peripheral side which form a pair. First, a substantially fan-shaped maximum hole A ₃ is provided for the oil pump to the oil pump. suction constitutes a groove, without an inner peripheral side of the crescent hole a _'3 pair, discharged hole B ₃ formed in a substantially plane symmetrical with respect to the this and the shaft insertion hole 31, the inner peripheral 'form a _3-to, or less in a clockwise direction, sequential rectangular torque converter oil passage hole C ₃ to E ₃ are circular hole C' crescent hole B of the side ₃ to E _'3, a rectangular test holes F ₃ the circular hole F _'3, rectangular breather hole G ₃ are independently hole, the lubricating oil passage hole H ₃ is circular hole H' _3, rectangular clutch fluid passage hole I ₅ are circular hole I _'3,
Rectangular brake oil passage hole J ₃ is _'3, another clutch fluid passage hole K ₃ rectangular circular hole K' circular hole J pairs respectively _3. These pairs of holes are connected to each other by respective communication grooves of a second pump body 5 described later. The hole indicated by reference numeral 34 in the figure is a knock pin hole, the portion indicated by 35 is a communication hole of an adjacent lightening concave portion, and the hole indicated by 36 is a detent hole for a piston.

The second pump body 5 has an outer diameter of the first pump body 2 to which the plate 3 is attached as shown in FIG. It has a disk shape with an outer diameter substantially matching, and has a shaft through hole 51 at the center portion that matches the shaft through hole. Each of the oil passages formed in the second pump body 5 and extending substantially in the radial direction is configured as a groove that is open only on the mating surface side with the plate 3. First, the grooves A ₅ are intended to constitute the intake groove of the oil into the oil pump, the groove suction extends from the outer diameter side of the pump body 5 in the direction of the shaft insertion hole 51 surrounds the substantially half of the outer peripheral side of the shaft insertion hole It has been. None This pair, the groove B ₅ which is formed in a substantially plane symmetrical with respect to the shaft insertion hole 51, there is a discharge to the groove of the oil. Hereinafter, in the clockwise direction, sequentially C ₅ to E ₅ is torque converter oil passage connecting groove, F ₅ test hole communicating groove, G ₅ breather hole communicating groove, H ₅ is the lubricating oil passage connecting groove, I ₅ the clutch oil road communication groove, J ₅ the brake fluid passage connecting groove, K ₅ is the other clutch fluid passage connecting groove. Code L ₅ In this case, showing the drain hole of the oil seal. The holes indicated by reference numeral 53A are bolt holes, 53B and 53C.
The hole indicated by is a bolt screw hole, the portion indicated by 55 is a lightening concave portion, and the hole indicated by 56 is a bottomed hole that constitutes the terminal end of the detent hole of the piston.

Next, the connection relation of each oil passage will be described.
You. Referring to FIG. 4, on the outer peripheral side of first pump body 2,
Connection with the transmission case on the mating surface side with the pump cover
Suction hole A opened in_TwoIs the suction groove A_Three, Suction groove A_Five
Through the crescent-shaped hole A '_ThreeTo the pump gear
Constitutes a suction oil passage that opens to the side surface of the oil passage. Also, crescent moon
Shaped hole B '_ThreeDischarge oil passage that opens to the side of the pump gear
Is the groove B_Five, Discharge hole B _ThreeThrough the discharge hole B_TwoIn the first
Open to the connection with the transmission case on the outer peripheral side of the pump body 2.
I'm talking. Three openings at the connection with the transmission case
Torque oil passage hole C _Two~ E_TwoAre each on an iron plate
Hole C_Three~ E_Three, Communication groove C of second pump body 5_Five~ E
_Five, Hole C 'in iron plate 3_Three~ E '_ThreeThrough the first
Outlet hole C 'on the inner peripheral side of pump body 2_Two~ E '_TwoWith pong
Constructs a torque converter oil passage that opens at the mating surface with the cover 4
I do. Brake test oil passage hole F_TwoOf the iron plate 3
Hole F _Three, Communication groove F of second pump body 5_Five, Iron pre
The hole F 'of the gate 3_Three, The outlet hole F 'of the first pump body 2
_Two, And communicates with the bottom of the cylinder groove 22. Brie
The hole G_TwoIs the hole G in the iron plate 3_Three, The second pump bo
Contact groove G of day 5_FiveIn parallel with the first pump body 2
Exit hole G '_TwoIs communicated to. Hole H for lubricating oil passage
_TwoIs the hole H in the iron plate 3_Three, The second pump body 5
Connecting groove H_FiveThrough the outlet hole H 'of the first pump body 2
_TwoLeads to. Clutch oil hole I_TwoIs I _Three, I_FiveTo
After I '_TwoLeads to. B2 brake oil passage hole J_TwoIs
Hole J in iron plate 3_Three, Communication of the second pump body 5
Groove J_Five, The outlet hole J 'of the first pump body 2_TwoOn the route
It communicates with the bottom of the cylinder groove 22. C1 clutch oil passage
Hole K_TwoIs the hole K in the iron plate 3_Three, The second pump body
Connection groove K for i5_FiveThrough the outlet hole of the first pump body 2
K '_TwoLeads to.

The oil pump constructed as described above, when installed in an automatic transmission as shown in FIG.
The inner peripheral side of the cylinder groove 22 of the pump body 2 is on the pump cover 4 with bolts 7C, the outer peripheral side is on the automatic transmission case 10 with bolts 7A, the first pump body 2, the iron plate 3, and the second pump body. 5 are fastened to each other with bolts 7B, whereby the openings of the respective oil passages are aligned with the oil passage openings of the pump cover 4 and the automatic transmission case 10 to establish an oil passage connection. As a result, the suction oil passage is the suction side oil passage of the valve body, the discharge oil passage is the line pressure oil passage, the brake oil passage and the two clutch oil passages are the servo pressure oil passages, the torque converter oil passage is the secondary pressure oil passage, The lubricating oil passages are respectively connected to the lubricating pressure oil passages. Further, the oil passages connected to the respective oil passages of the pump cover 4 pass through the oil passages in the cover 4, the oil passages in the input shaft of the automatic transmission, the input shaft, the stator shaft, and the like.
Connected to the inter-axis oil passage of the pump shaft.

From such a connection relationship, the oil discharged from the oil pump driven by the turbine rotation of the torque converter 8 is supplied to the valve body, where the pressure is adjusted appropriately and returns to the pump body again. The oil is supplied to each part via an in-shaft and inter-shaft oil passage, and is used for control and lubrication of the automatic transmission.

Thus, in this oil pump, the weight of the oil pump is reduced by forming the first pump body 2 from light metal. Further, since the iron plate 3 and the pump cover 4 are arranged on both sides of the first pump body 2, the occurrence of erosion due to cavitation can be suppressed, and the durability of the pump body does not deteriorate. Moreover,
A pump gear chamber 21 penetrated in the axial direction is provided in the first pump body 2, and an iron plate 3 and a pump cover 4 are arranged on both sides of the pump gear chamber 21. In the case where the pump gear chamber is provided as a recess in the pump body as in the conventional configuration, the centering process is performed by a cutter. Therefore, the accuracy of the depth of the recess, the bottom surface of the recess, and the pump cover are defined. It is difficult to increase the degree of parallelism with the mating surface of the pump gear chamber 21 as opposed to the first end.
In the configuration defined by the pump body 2 itself, since the end face processing is performed, the accuracy of the thickness and the parallelism can be relatively easily improved by polishing or the like, so that the processing for making the pump gear chamber 21 highly accurate is easy. Becomes

Next, since the oil pump as a large-diameter part necessary for sealing the opening of the transmission is made of a light metal, the weight of the automatic transmission is reduced. Further, since the pump body conventionally formed integrally is divided into two parts, complicated three-dimensional oil passages for suction, discharge, clutches, brakes, and the like formed in the pump body are formed in the two pump bodies 2, 5. The pump bodies 2 and 5 can be formed without using a core because a simple planar groove divided by an iron plate 3 between the pump bodies can be formed. It can be manufactured by cast molding, and higher precision and cost reduction can be achieved as compared with cast products.

The oil passages provided in each of the two divided pump bodies 2 and 5 are connected to an iron plate 3 between them.
, A large number of oil passages for suction, discharge, clutch, brake, etc. are dispersedly arranged in the two pump bodies 2 and 5, and a large number of oil passages are maintained while maintaining the strength of the pump bodies. Can be arranged. And
Thus, even if the brake hydraulic servo 6 is provided, the configuration of the oil passage is facilitated.

Further, since the torque converter 8 is supported on the transmission case 10 via only the second pump body 5, the accuracy of supporting the torque converter with respect to the transmission case 10 is also improved. Also, the transmission case 10 and the second
O-ring 51 for sealing with the pump body 5
Is provided in the extending portion 5c which overlaps the first pump body 2 in the axial direction, so that the axial length of the oil pump is reduced. Further, since the first pump body 2 itself is also directly supported by the transmission case 10, the centering accuracy of the oil pump with respect to the transmission case 10 is also improved. Further, by making the iron plate 3 approximately the same diameter as the first pump body 2, it is not necessary to provide a recess for fitting the iron plate 3 in the first pump body 2,
Processing is easy.

Although the present invention has been described in detail based on one embodiment, the present invention is not limited to the illustrated embodiment, but can be implemented in various forms within the scope of the claims. .

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an oil pump according to an embodiment of the present invention together with an automatic transmission into which the oil pump is incorporated.

FIG. 2 is a plan view of the first pump body as viewed from a direction in which a pump cover and a transmission case meet.

FIG. 3 is a plan view of the iron plate as viewed from a first pump body mating surface direction.

FIG. 4 is a plan view of the second pump body as viewed from the direction of the mating surface of the iron plate.

[Explanation of symbols]

Reference Signs List 1A Drive gear (pump gear) 1B Driven gear (pump gear) 2 First pump body 2a Support 21 Pump gear chamber hole (pump gear chamber) A _{2 to} K ₂ Oil passage 3 Iron plate (first iron member) A _{3 to} K ₃ holes 4 pump cover (second iron member) 5 second pump body 5a abutting portion 5b supporting portion 5c extending portion a ₅ ~K ₅ connecting groove (oil passage) 51 O-ring (seal ring) 6 hydraulic servo 7A Bolt (fastening means) 8 Torque converter (fluid transmission) 9 Bush 10 Transmission case

Continued on the front page (72) Inventor Masaaki Nishida 10 Takane, Fujii-cho, Anjo, Aichi Prefecture Inside Aisin AW Co., Ltd. (72) Inventor Satoru Kasuya 10 Takane, Fujii-cho, Anjo, Aichi Aisin Ai No. Ike Nokazu Ike 10 Takane, Fujii-machi, Anjo-city, Aichi Prefecture Inside AW Co., Ltd. (72) Takashi Morimoto 10 Takane, Fujii-machi, Anjo-city, Aichi Prefecture Aisin Ai・ Within Wu Co., Ltd. In-house F term (reference) 3H041 AA02 BB03 CC13 CC15 DD01 DD05 DD11 DD21 DD33 3J063 AB43 AB53 AC04 BA01 BA03 BA05 BA10 BA11 BB03 BB12 BB41 BB42 BB44 BB48 CA01 CD04 CD33 CD41 CD70 XA22 XA35 XC02 XC03 XDXDX

Claims (9)

[Claims] 1. A pump gear, a first pump body made of light metal, which is substantially the same thickness as the pump gear, and accommodates the pump gear in a pump gear chamber penetrating in a thickness direction, and on both sides of the first pump body. First and second attached
An oil pump comprising: an iron member; 2. A light pump comprising a second pump body made of light metal disposed on one side of the first pump body, wherein the first iron member includes a first pump body and a second pump body.
The second iron member is a pump cover, and at least one of the first pump body and the second pump body closes an opening of the transmission case. Claim 1.
The described oil pump. 3. The oil pump according to claim 2, wherein said second pump body has a plurality of oil passages. 4. The oil pump according to claim 3, wherein the iron plate has a plurality of holes communicating the oil passages of the first pump body and the second pump body. 5. The oil pump according to claim 3, wherein a hydraulic servo of a transmission is incorporated in the first pump body. 6. The second pump body has a contact portion radially in contact with an opening of the transmission case on an outer peripheral portion thereof and a fluid transmission device on an inner peripheral portion of the second pump body via a bush. The oil pump according to claim 2, further comprising a support portion configured to support the oil pump, and fastened to the transmission case by fastening means. 7. The contact portion has an extension that extends in the direction of the first pump body and overlaps with the first pump body in the axial direction, and a seal ring is disposed on the extension. The oil pump according to claim 6, which is provided. 8. The oil pump according to claim 6, further comprising a support portion provided on an outer peripheral portion of the first pump body, the support portion being in radial contact with an opening of the transmission case. 9. The oil pump according to claim 2, wherein the iron plate has substantially the same diameter as a surface of the first pump body on the side of the second pump body.