CN209484253U - automatic transmission oil pump - Google Patents

Abstract

The utility model discloses an automatic transmission oil pump, which mainly comprises an oil pump body, a rear cover assembly, a front cover assembly, a low-pressure pump rotor system, a high-pressure pump rotor system, a drive shaft, a needle roller, a sealing ring and a retaining ring. One end of the front cover assembly is connected to the oil pump body through screws, and the other end is connected to the motor through screws. The rear cover assembly is connected to the oil pump body through screws. The low-pressure pump rotor system is arranged in the low-pressure rotor chamber. The high-pressure pump rotor system is arranged in the high-pressure rotor chamber. One end of the drive shaft is connected to the motor, and the main body of the drive shaft passes through the oil pump body. One end of the needle roller is keyed into the keyway. The sealing ring seals the bonding surface of the front cover and the bonding surface of the rear cover. The retaining ring defines where the drive shaft passes through the oil pump body. The utility model reduces the noise of the oil pump and improves the transmission efficiency. The utility model adjusts the input speed according to the flow demand, avoids power waste, reduces energy consumption, improves the controllability of the oil pump hydraulic system, and increases the life of the oil pump.

Description

automatic transmission oil pump

technical field

The utility model relates to the technical field of automatic transmissions for automobiles, in particular to an oil pump for automatic transmissions.

Background technique

Automobile automatic transmission oil pump, as the power source of the entire hydraulic control system of automatic transmission and the lubrication device of each friction pair in the box, is one of the key components related to automobile power, economy and comfort. In order to meet more stringent fuel economy and emission reduction requirements without affecting the comfort, convenience and various dynamic characteristics that drivers are accustomed to, the internal combustion engine is equipped with automatic start-stop function or "coasting" function, etc., The traditional mechanical oil pump cannot meet the new technical requirements, and an electric oil pump must be used instead.

The working principle of the automatic transmission oil pump is that the meshed oil pump rotor assembly rotates to suck and discharge fluid by changing the volume change formed by the meshed rotor and the housing having a suction port and a discharge port. Different from the traditional mechanical oil pump driving method, the oil pump does not use a hydraulic torque converter to drive, but instead directly uses a precise control motor to output power, which can make the electric oil pump always work at the required speed, and can realize when the engine stops running , to keep the oil pressure required by the hydraulic system until the main pump resumes operation.

This electric oil pump reliably lubricates and cools clutches, bearings and gear sets. When restarting the engine, the electric assistance system provides a driving experience far more dynamic than a conventional mechanical oil pump. At the same time, the gearbox works faster, smoother and quieter. In this way, the electric oil pump ensures greater comfort with lower fuel consumption.

However, the current automatic transmission oil pump has problems such as loud noise, unstable flow, serious oil trapping in the oil pump, and the like.

Utility model content

The purpose of this utility model is to solve the problems existing in the prior art.

The technical solution adopted to achieve the purpose of this utility model is as follows: an automatic transmission oil pump mainly includes an oil pump body, a rear cover assembly, a front cover assembly, a low-pressure pump rotor system, a high-pressure pump rotor system, a drive shaft, a roller Needles, seals and retaining rings.

The oil pump body mainly includes an oil inlet, an oil inlet groove, an oil outlet, an oil outlet groove, an unloading groove, a high-pressure rotor chamber, a low-pressure rotor chamber and an inner cavity I.

The middle part of the oil pump body is provided with a high-pressure rotor chamber, a low-pressure rotor chamber and an inner bore chamber.

The oil inlet is set at one end of the oil pump body.

The oil inlet is rectangular, and its four corners are arc corners.

The width of the oil inlet is 2v, the length is 2w, and the arc radius is 8r ₂ . 10mm≤w≤12mm. 8mm≤v≤10mm. _{2mm≤r2≤4mm} .

The oil inlet mainly includes a high-pressure pump oil inlet and a low-pressure oil inlet.

The oil inlet groove communicates with the oil inlet.

The tail end of the oil inlet groove has a rounded corner with _r1 as the radius. Moreover, the range of the radius r is: 1mm≤r ₁ ≤2mm.

The oil outlet is opened at the other end of the oil pump body.

The oil outlet mainly includes an oil outlet of a high pressure pump and an oil outlet of a low pressure pump.

The oil outlet is circular. The diameter of the oil outlet is 2d. 12mm≤d≤14mm.

The oil outlet groove communicates with the oil outlet.

The tail end of the oil outlet groove has a rounded corner with R as the radius. Moreover, the range of the radius R is: 1mm≤R≤2.5mm.

The unloading groove is close to the tail end of the oil outlet groove.

The unloading groove is an arc-shaped groove, which mainly includes an inner arc surface, an outer arc surface and a small arc surface formed by processing at both ends. The arcs of the inner arc surface and the outer arc surface are all close The center of the gear is the center of the circle.

The range of the radius m of the outer arc surface of the unloading groove is: 1mm≤m≤2mm.

The range of the radius t of the arc surface inside the unloading groove is: 0.5mm≤t≤1.5mm.

The rear cover assembly is connected to the oil pump body through screws.

Described screw is flower type screw.

The rear cover assembly mainly includes a rear cover, a bushing I, a positioning pin I and a sealing groove I.

The bushing I is press-fitted to the back cover through interference fit, thereby forming the inner cavity II.

The positioning pin 1 limits the degree of freedom of the back cover.

The sealing groove I is opened on the bonding surface of the back cover.

One end of the front cover assembly is connected to the oil pump body through screws. The other end of the front cover assembly is connected to the motor by screws.

The front cover assembly mainly includes a front cover, a bushing II, a positioning pin II, a sealing groove II and a sealing groove III.

The bushing II is press-fitted to the front cover by interference fit, thereby forming the inner cavity III.

The positioning pin II limits the degree of freedom of the front cover.

The sealing groove II is opened on the front bonding surface of the front cover.

The sealing groove III is opened on the anti-bonding surface of the front cover.

The low-pressure pump rotor system mainly includes a low-pressure pump inner rotor and a low-pressure pump outer rotor.

The low-pressure pump rotor system is arranged in the low-pressure rotor chamber. The inner rotor of the low-pressure pump and the outer rotor of the low-pressure pump mesh with each other.

The high-pressure pump rotor system mainly includes a high-pressure pump inner rotor and a high-pressure pump outer rotor.

The high-pressure pump rotor system is arranged in the high-pressure rotor chamber. The inner rotor of the high-pressure pump and the outer rotor of the high-pressure pump mesh with each other.

The number of teeth of the inner rotor of the low pressure pump is 7. The number of teeth of the outer rotor of the low pressure pump is 8. The difference in the number of teeth between the inner rotor of the low-pressure pump and the outer rotor of the low-pressure pump is 1.

The outer diameter of the inner rotor of the low-pressure pump is 34mm-36mm, and the thickness is 11.5-13mm. The diameter of the outer circle of the outer rotor of the low-pressure pump is 44mm-46mm.

The range of the eccentricity k ₁ of the inner rotor of the low-pressure pump and the outer rotor of the low-pressure pump is: _{1.5mm≤k1≤3mm} .

The number of teeth of the inner rotor of the high pressure pump is 8. The number of teeth of the outer rotor of the high pressure pump is 9. The difference in the number of teeth between the inner rotor of the high pressure pump and the outer rotor of the high pressure pump is 1.

The outer diameter of the inner rotor of the high-pressure pump is 35mm-36mm, and the thickness is 11.5-13mm. The diameter of the outer circle of the outer rotor of the high-pressure pump is 55 mm to 56 mm.

The range of the eccentricity k ₂ of the inner rotor of the high-pressure pump and the outer rotor of the high-pressure pump is: _{1.5mm≤k2≤3mm} .

The center of the inner rotor of the low-pressure pump has an inner slot I for the drive shaft to pass through.

The inner groove I is formed by splicing an arc groove I and a semicircular groove I. The radius of arc groove I is greater than the radius of semicircle groove I.

The other end of the needle roller is inserted into the semicircular groove I, so as to transmit the torque of the drive shaft to the inner rotor of the low-pressure pump.

The center of the inner rotor of the high-pressure pump has an inner slot II through which the drive shaft passes.

The inner groove II is spliced by circular arc groove II and semicircular groove II. The radius of the circular arc groove II is greater than the radius of the semicircular groove II.

The other end of the needle roller is inserted into the semicircular groove II, so as to transmit the torque of the drive shaft to the inner rotor of the high-pressure pump.

The drive shaft mainly includes a drive shaft main body, a retaining ring groove and a keyway.

The end of the main body of the drive shaft connected to the motor is designated as end A. The A end of the main body of the drive shaft is a flat shaft.

The main body of the drive shaft passes through the oil pump body.

The drive shaft main body drives the rotor system of the low-pressure pump and the rotor system of the high-pressure pump to rotate.

The inner cavity I and the drive shaft are in clearance fit. The inner cavity II is in clearance fit with the lower end of the drive shaft. The inner cavity III is in clearance fit with the upper end of the drive shaft.

One end of the needle roller is keyed into the keyway.

The sealing ring is placed in the sealing groove I and the sealing groove II.

The sealing ring seals the bonding surface of the front cover and the bonding surface of the rear cover.

The sealing ring is an O-ring.

The retaining ring is keyed into the retaining ring groove.

The stop ring defines the position where the drive shaft passes through the oil pump body.

The technical effect of the utility model is beyond doubt. The utility model realizes the direct connection between the oil pump and the motor, and the motor can directly drive the oil pump to rotate. The transmission precision of the output shaft of the motor is very high, which can reduce the noise of the oil pump, greatly improve the transmission efficiency, adjust the input speed according to the flow demand, avoid power waste, reduce energy consumption, improve the controllability of the oil pump hydraulic system, and increase the life of the oil pump.

The oil pump of the utility model adopts a double-pump design. The high-pressure pump and the low-pressure pump are respectively designed on both sides of the oil pump body. The low-pressure pump can meet the cooling and lubrication flow requirements of the system, and the high-pressure pump can meet the high-pressure and stable flow requirements of the system. Compared with the single-pump system The advanced oil pump has the advantages of high pressure, stable flow and sufficient lubrication.

The oil pump body, the front cover assembly and the rear cover assembly of the utility model adopt corresponding oil grooves, and corresponding unloading grooves are set at the same time, and the initial position of the unloading grooves is at the position of the largest cavity Afterwards, before the oil begins to unload, the oil trapping phenomenon of the oil pump is alleviated, and the noise of the oil pump is reduced.

Description of drawings

Fig. 1 is the structural representation of oil pump;

Figure 2 is a schematic diagram of the rear cover assembly;

Fig. 3 is a structural schematic diagram of the low-pressure pump rotor system;

Fig. 4 is a schematic structural diagram of the high-pressure pump rotor system;

Figure 5 is a schematic diagram of the assembly of the inner rotor and drive shaft of the high-pressure pump;

Figure 6 is a schematic diagram of the front cover assembly;

Fig. 7 is a schematic diagram of the oil tank in the rotor chamber of the oil pump body with size marks;

Fig. 8 is a schematic diagram of the oil tank in the rotor cavity of the oil pump body;

Fig. 9 is a schematic diagram of the oil inlet and outlet of the oil pump body;

In the figure: oil pump body 1, rear cover assembly 2, front cover assembly 3, low-pressure pump rotor system 4, high-pressure pump rotor system 5, drive shaft 6, needle roller 7, sealing ring 8, retaining ring 9, oil inlet groove 102 , oil outlet tank 104, unloading tank 105, rear cover 201, bushing I202, positioning pin I203, front cover 301, bushing II302, positioning pin II303, low-pressure pump inner rotor 401, low-pressure pump outer rotor 402, arc groove I4011 , semicircular groove I4012, high pressure pump inner rotor 501, high pressure pump outer rotor 502, drive shaft main body 601, circular arc groove II5011, semicircular groove II5012, high pressure pump oil inlet 1011, low pressure oil inlet 1012, high pressure pump oil outlet 1031 And low pressure pump oil outlet 1032.

Detailed ways

The utility model will be further described below in conjunction with the embodiments, but it should not be understood that the scope of the above subject matter of the utility model is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present utility model, various replacements and changes made according to common technical knowledge and conventional means in the art shall be included in the protection scope of the present utility model.

Example 1:

Referring to Figures 1 to 9, an automatic transmission oil pump mainly includes an oil pump body 1, a rear cover assembly 2, a front cover assembly 3, a low-pressure pump rotor system 4, a high-pressure pump rotor system 5, a drive shaft 6, and a needle roller 7 , sealing ring 8 and retaining ring 9.

The oil pump body 1 mainly includes an oil inlet, an oil inlet groove 102, an oil outlet, an oil outlet groove 104, an unloading groove 105, a high-pressure rotor chamber, a low-pressure rotor chamber and an inner cavity I.

The middle part of the oil pump body 1 is provided with a high-pressure rotor chamber, a low-pressure rotor chamber and an inner bore chamber.

The oil inlet is opened at one end of the oil pump body 1 .

The oil inlet is rectangular, and its four corners are arc corners.

The width of the oil inlet is 2v, the length is 2w, and the arc radius is 8r ₂ . 10mm≤w≤12mm. 8mm≤v≤10mm. _{2mm≤r2≤4mm} .

The oil inlet mainly includes a high-pressure pump oil inlet 1011 and a low-pressure oil inlet 1012 .

The oil inlet groove 102 communicates with the oil inlet.

The tail end of the oil inlet groove 102 has a rounded corner with a radius of _r1 . Moreover, the range of the radius r is: 1mm≤r ₁ ≤2mm.

The oil outlet is opened at the other end of the oil pump body 1 .

The oil outlet mainly includes a high pressure pump oil outlet 1031 and a low pressure pump oil outlet 1032 .

The oil outlet is circular. The diameter of the oil outlet is 2d. 12mm≤d≤14mm.

The oil outlet groove 104 communicates with the oil outlet.

The tail end of the oil outlet groove 104 has a rounded corner with R as the radius. Moreover, the range of the radius R is: 1mm≤R≤2.5mm.

The unloading groove 105 is close to the tail end of the oil outlet groove 104 .

The unloading groove 105 is an arc-shaped groove, which mainly includes an inner arc surface, an outer arc surface and a small arc surface formed by processing at both ends. The center of the adjacent gear is the center of the circle.

The unloading groove 105 is shaped like rabbit ears.

The range of the radius m of the outer arc surface of the unloading groove 105 is: 1mm≤m≤2mm.

The range of the radius t of the inner arc surface of the unloading groove 105 is: 0.5mm≤t≤1.5mm.

The periphery of the unloading groove 105 assists oil absorption, and its thickness n ranges from: 0.5mm≤n≤1.5mm.

The rear cover assembly 2 is connected to the oil pump body 1 by screws.

Described screw is flower type screw.

The rear cover assembly 2 mainly includes a rear cover 201, a bushing I202, a positioning pin I203 and a sealing groove I.

The bushing I202 is press-fitted to the rear cover 201 through interference fit, thereby forming the inner cavity II.

The positioning pin I203 limits the degree of freedom of the rear cover 201 .

The sealing groove I is opened on the bonding surface of the back cover 201 .

One end of the front cover assembly 3 is connected to the oil pump body 1 by screws. The other end of the front cover assembly 3 is connected to the motor by screws.

The front cover assembly 3 mainly includes a front cover 301, a bushing II 302, a positioning pin II 303, a sealing groove II and a sealing groove III.

The bushing II 302 is press-fitted to the front cover 301 by interference fit, thereby forming the inner cavity III.

The positioning pin II303 limits the degree of freedom of the front cover 301 .

The sealing groove II is opened on the front bonding surface of the front cover 301 .

The sealing groove III is opened on the anti-bonding surface of the front cover 301 .

The low-pressure pump rotor system 4 mainly includes a low-pressure pump inner rotor 401 and a low-pressure pump outer rotor 402 .

The low-pressure pump rotor system 4 is arranged in the low-pressure rotor chamber. The low-pressure pump inner rotor 401 and the low-pressure pump outer rotor 402 mesh with each other. The low-pressure pump rotor system is connected to the low-pressure pump.

The high-pressure pump rotor system 5 mainly includes a high-pressure pump inner rotor 501 and a high-pressure pump outer rotor 502 .

The high-pressure pump rotor system 5 is arranged in the high-pressure rotor cavity. The high-pressure pump inner rotor 501 and the high-pressure pump outer rotor 502 mesh with each other. The high-pressure pump rotor system is connected to the high-pressure pump.

The inner rotor 401 of the low-pressure pump has seven teeth. The number of teeth of the outer rotor 402 of the low-pressure pump is eight. The difference between the number of teeth of the low-pressure pump inner rotor 401 and the low-pressure pump outer rotor 402 is 1.

The outer diameter of the inner rotor 401 of the low-pressure pump is 34mm-36mm, and the thickness is 11.5-13mm. The outer diameter of the outer rotor 402 of the low-pressure pump is 44mm-46mm.

The range of the eccentricity k ₁ of the low-pressure pump inner rotor 401 and the low-pressure pump outer rotor 402 is: _{1.5mm≤k1≤3mm} .

The number of teeth of the inner rotor 501 of the high pressure pump is 8. The high-pressure pump outer rotor 502 has nine teeth. The difference between the number of teeth of the high-pressure pump inner rotor 501 and the high-pressure pump outer rotor 502 is 1.

The outer diameter of the inner rotor 501 of the high-pressure pump is 35mm-36mm, and the thickness is 11.5-13mm. The outer diameter of the outer rotor 502 of the high-pressure pump is 55mm-56mm.

The range of the eccentricity k ₂ of the high-pressure pump inner rotor 501 and the high-pressure pump outer rotor 502 is: _{1.5mm≤k2≤3mm} .

The center of the inner rotor 401 of the low-pressure pump has an inner slot I through which the drive shaft passes.

The inner groove I is spliced by arc groove I4011 and semicircle groove I4012. The radius of the circular arc groove I4011 is greater than the radius of the semicircular groove I4012.

The other end of the needle roller 7 is inserted into the semicircular groove I4012, so as to transmit the torque of the drive shaft 6 to the inner rotor 401 of the low-pressure pump.

The center of the inner rotor 501 of the high-pressure pump has an inner slot II through which the drive shaft passes.

The inner groove II is spliced by circular arc groove II5011 and semicircular groove II5012. The radius of the circular arc groove II5011 is greater than the radius of the semicircular groove II5012.

The other end of the needle roller 7 is inserted into the semicircular groove II5012, so as to transmit the torque of the drive shaft 6 to the inner rotor 501 of the high-pressure pump.

The drive shaft 6 mainly includes a drive shaft main body 601 , retaining ring grooves and key grooves.

The end of the drive shaft main body 601 connected to the motor is designated as end A. The end A of the drive shaft main body 601 is a flat shaft.

The drive shaft main body 601 passes through the oil pump body 1 .

The drive shaft main body 601 drives the low-pressure pump rotor system 4 and the high-pressure pump rotor system 5 to rotate.

The inner cavity 1 and the drive shaft 6 are in clearance fit. The inner cavity II and the lower end of the drive shaft 6 are in clearance fit. The inner cavity III and the upper end of the drive shaft 6 are in clearance fit.

One end of the needle roller 7 is keyed into the keyway.

The sealing ring 8 is placed in the sealing groove I and the sealing groove II.

The sealing ring 8 seals the bonding surface of the front cover 301 and the bonding surface of the rear cover 201 .

The sealing ring is an O-ring.

The retaining ring 9 is keyed into the retaining ring groove. The number of retaining rings and retaining ring grooves are both 2.

The stop ring 9 limits the position where the drive shaft 6 passes through the oil pump body 1 .

Claims (9)

1. a kind of ATF pump, it is characterised in that: mainly include oil pump body (1), rear cover assembly (2), preceding cap assembly (3), low-lift pump rotor-support-foundation system (4), high-pressure pump rotor-support-foundation system (5), drive shaft (6), needle roller (7), sealing ring (8) and retaining ring (9)；

The oil pump body (1) mainly includes oil inlet, oil-feed tank (102), oil outlet, goes out oil groove (104), compensating groove (105), height Press rotor chamber, low pressure rotor chamber and bore I；

The middle part of the oil pump body (1) is equipped with high pressure rotor chamber, low pressure rotor chamber and bore I；

The oil inlet is provided with one end of oil pump body (1)；

The oil inlet mainly includes high-pressure pump oil inlet (1011) and low pressure oil inlet (1012)；

The oil-feed tank (102) is connected to oil inlet；

The oil outlet is provided with the other end of oil pump body (1)；

The oil outlet mainly includes high-pressure pump oil outlet (1031) and low-lift pump oil outlet (1032)；

Oil groove (104) out are connected to oil outlet；

The compensating groove (105) is close to the tail end of oil groove (104) out；

The compensating groove (105) is arc-shaped groove, and main includes that inner arc face, outer arc face and both ends process to be formed The circular arc in small arc surface, inner arc face and outer arc face is using the center of close gear as the center of circle；

The rear cover assembly (2) is connected by screw to oil pump body (1)；

The rear cover assembly (2) mainly includes rear cover (201), bushing I (202), positioning pin I (203) and seal groove I；

The bushing I (202) is pressed by interference fit to rear cover (201), to form bore II；

The freedom degree of positioning pin I (203) limitation rear cover (201)；

The seal groove I is provided on the binding face of rear cover (201)；

One end of the preceding cap assembly (3) is connected by screw to oil pump body (1)；The other end of the preceding cap assembly (3) passes through spiral shell Nail connection motor；

The preceding cap assembly (3) mainly includes front cover (301), bushing II (302), positioning pin II (303), seal groove II and sealing Slot III；

The bushing II (302) is pressed by interference fit to front cover (301), to form bore III；

The freedom degree of positioning pin II (303) limitation front cover (301)；

The seal groove II is provided on the positive binding face of front cover (301)；

Seal groove III is provided on the anti-binding face of front cover (301)；

The low-lift pump rotor-support-foundation system (4) mainly includes low-lift pump internal rotor (401) and low-lift pump outer rotor (402)；

Low-lift pump rotor-support-foundation system (4) setting is intracavitary in low pressure rotor；Turn outside the low-lift pump internal rotor (401) and low-lift pump Sub (402) intermeshing；

The high-pressure pump rotor-support-foundation system (5) mainly includes high-pressure pump internal rotor (501) and high-pressure pump outer rotor (502)；

High-pressure pump rotor-support-foundation system (5) setting is intracavitary in high pressure rotor；Turn outside the high-pressure pump internal rotor (501) and high-pressure pump Sub (502) intermeshing；

The drive shaft (6) mainly includes driving shaft body (601), circlip groove and keyway；

One end of driving shaft body (601) connects motor；One end of driving shaft body (601) the connection motor is flat Axis；

The driving shaft body (601) passes through oil pump body (1)；

The driving shaft body (601) drives low-lift pump rotor-support-foundation system (4) and high-pressure pump rotor-support-foundation system (5) rotation；

It keys in keyway one end of the needle roller (7)；

The sealing ring (8) is placed in the seal groove I, seal groove II and seal groove III；

The sealing ring (8) is sealed two binding faces of front cover (301) and the binding face of rear cover (201)；

The retaining ring (9) is keyed in circlip groove；

The retaining ring (9) limits the position that drive shaft (6) pass through oil pump body (1).

2. a kind of ATF pump according to claim 1, it is characterised in that: the bore I and drive shaft (6) Clearance fit；The bore II and the cooperation of drive shaft (6) lower gap；The bore III and drive shaft (6) upper gap Cooperation.

3. a kind of ATF pump according to claim 1, it is characterised in that: the screw is flower pattern screw.

4. a kind of ATF pump according to claim 1, it is characterised in that: the sealing ring is O-ring seal.

5. a kind of ATF pump according to claim 1, it is characterised in that: the low-lift pump internal rotor (401) The number of teeth be 7；The number of teeth of the low-lift pump outer rotor (402) is 8；The low-lift pump internal rotor (401) and low-lift pump outer rotor (402) number of teeth difference is 1；

The outside diameter of the low-lift pump internal rotor (401) is 34mm~36mm, and thickness is 11.5~13mm；The low-lift pump The outside diameter of outer rotor (402) is 44mm~46mm；

The eccentricity k of the low-lift pump internal rotor (401) and low-lift pump outer rotor (402)₁Range are as follows: 1.5mm≤k₁≤3mm；

The number of teeth of the high-pressure pump internal rotor (501) is 8；The number of teeth of the high-pressure pump outer rotor (502) is 9；The high-pressure pump The number of teeth difference of internal rotor (501) and high-pressure pump outer rotor (502) is 1；

The outside diameter of the high-pressure pump internal rotor (501) is 35mm~36mm, and thickness is 11.5~13mm；The high-pressure pump The outside diameter of outer rotor (502) is 55mm~56mm；

The eccentricity k of the high-pressure pump internal rotor (501) and high-pressure pump outer rotor (502)₂Range are as follows: 1.5mm≤k₂≤3mm。

6. a kind of ATF pump according to claim 1, it is characterised in that: the low-lift pump internal rotor (401) Center there is the inside groove I that passes through for drive shaft；

The inside groove I is spliced by arc groove I (4011) and half slot I (4012)；The radius of arc groove I (4011) is greater than half The radius of circular groove I (4012)；

The other end of the needle roller (7) keys in half slot I (4012), so that the torque of drive shaft (6) be passed in low-lift pump Rotor (401)；

The center of the high-pressure pump internal rotor (501) has the inside groove II passed through for drive shaft；

The inside groove II is spliced by arc groove II (5011) and half slot II (5012)；The radius of arc groove II (5011) is big Radius in (5012) half slot II；

The other end of the needle roller (7) keys in half slot II (5012), so that the torque of drive shaft (6) be passed in high-pressure pump Rotor (501).

7. a kind of ATF pump according to claim 1, which is characterized in that circle on the outside of the compensating groove (105) The range of the radius m of cambered surface are as follows: 1mm≤m≤2mm；

The range of the radius t in compensating groove (105) the inner arc face are as follows: 0.5mm≤t≤1.5mm.

8. a kind of ATF pump according to claim 1, it is characterised in that:

The tail end of the oil-feed tank (102) has with r₁For the rounded corner of radius；And the range of radius r are as follows: 1mm≤r₁≤2mm；

The tail end of oil groove (104) out has using R as the rounded corner of radius；And the range of radius R are as follows: 1mm≤R≤ 2.5mm。

9. a kind of ATF pump according to claim 1, it is characterised in that: the oil inlet be rectangle, four A angle is arc chord angle；

The width of the oil inlet is 2v, a length of 2w, arc radius 8r₂；10mm≤w≤12mm；8mm≤v≤10mm；2mm≤r₂ ≤4mm；

The oil outlet is circle；The diameter of the oil outlet is 2d；12mm≤d≤14mm.