CN111946803A - Oil pump of hybrid transmission - Google Patents

Abstract

Mix transmission machine oil pump, relate to oil pump technical field, it includes the pump body, pump cover, inner rotor, outer rotor and passes the pump body and pump cover and the pump shaft of being connected with inner rotor, the right-hand member of pump shaft stretches out and the transmission is connected with drive gear outwards in the pump body, be equipped with the shaft shoulder on the outer wall of pump shaft, the shaft shoulder leans on in the left end face of inner rotor to the right side, the position that the bottom of pump body inner chamber corresponds pump body oil absorption district and oil discharge district is provided with first oil storage tank and second oil storage tank respectively, the bottom of pump body inner chamber is provided with pump body annular oil storage tank around the pump shaft, intercommunication has pump body oil guide groove between pump body annular oil storage tank and the second oil storage tank, still be connected with between pump shaft and the drive gear and be used for making drive gear can. The invention can ensure that the pump shaft obtains better lubricating and cooling effects and improves the working stability of the pump shaft.

Description

Hybrid Transmission Oil Pump

technical field

The invention relates to the technical field of oil pumps, in particular to a hybrid transmission oil pump.

Background technique

The dual-motor single-speed PHEV powertrain is often used in different models, such as RVs and SUVs. The hydraulic system of the powertrain contains five components: transmission oil pump, electric pump, valve body, oil suction filter and accumulator. Among them, the transmission oil pump is a low-pressure and high-flow mechanical pump, which is mainly responsible for cooling the motor and lubricating the bearings. The existing transmission oil pump usually causes the working state of the pump shaft to be unstable due to the axial force generated by the helical gear. Better lubrication and cooling.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an oil pump for a hybrid transmission, so that the pump shaft can obtain better lubricating and cooling effects and improve the working stability of the pump shaft.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: a hybrid transmission oil pump, comprising a pump body, a pump cover, an inner rotor, an outer rotor, and a shaft hole passing through the shaft hole of the pump body and the shaft hole of the pump cover and connected with the inner rotor The pump shaft, the right end of the pump shaft protrudes from the pump body and is connected with a transmission gear, the outer wall of the pump shaft is provided with a shaft shoulder, and the shaft shoulder abuts against the left end face of the inner rotor to the right, The bottom of the pump body cavity is provided with a first oil storage tank and a second oil storage tank at the positions corresponding to the oil suction area and the oil discharge area of the pump body, respectively. The bottom of the pump body cavity is provided with a pump body annular oil storage tank around the pump shaft. Between the annular oil storage tank of the pump body and the second oil storage tank is a pump body oil guiding groove, the inner wall of the shaft hole of the pump body is provided with an oil guiding groove of the shaft hole of the pump body that communicates with the annular oil storage groove of the pump body, and the pump cover The inner end face of the pump body is provided with a third oil storage tank and a fourth oil storage tank respectively at the positions corresponding to the oil suction area and the oil discharge area of the pump body. The inner end face of the pump cover is provided with a pump cover annular oil storage tank around the pump shaft. The pump cover A pump cover oil guiding groove is communicated between the annular oil storage tank and the fourth oil storage tank. The inner wall of the shaft hole of the pump cover is provided with an oil guiding groove of the pump cover shaft hole which is connected to the annular oil storage groove of the pump cover. The pump shaft is connected to the transmission gear. A one-way clutch for enabling the transmission gear to only drive the pump shaft to rotate in one direction is also connected therebetween.

Preferably, an oil suction port and an oil discharge port are respectively provided on the pump cover at positions corresponding to the oil suction area and the oil discharge area of the pump body, and the pump cover located on one side of the oil suction port is also provided with a pressure relief valve. oil return port.

More preferably, both sides of the oil suction port are respectively provided with a threaded hole, both sides of the oil discharge port are also respectively provided with a threaded hole, and both sides of the oil return port are also provided with a threaded hole respectively.

More preferably, the left end of the pump shaft protrudes from the pump cover, and the left end surface of the pump cover is provided with an annular positioning boss matched with the pump shaft around the pump shaft.

More preferably, the pump cover located on one side of the oil discharge port is provided with a positioning pin hole for matching the transmission.

The beneficial effect of the present invention is that when the transmission gear generates an axial force and the pump shaft is subjected to a rightward force, since the shaft shoulder on the outer wall of the pump shaft can abut the inner rotor to the right, it can better offset this In addition, by setting the pump body annular oil storage tank on the pump body and the pump cover annular oil storage tank on the pump cover, the oil can flow into the periphery of the pump shaft and enter the corresponding The oil guiding groove of the shaft hole of the pump body and the oil guiding groove of the shaft hole of the pump cover can produce better lubrication and cooling effect on the pump shaft, the shaft hole of the pump body and the shaft hole of the pump cover; finally, by connecting the pump shaft and the transmission gear A one-way clutch is set between to ensure that the oil pump does not work when the transmission gear rotates in the reverse direction.

Description of drawings

1 is a schematic cross-sectional view of an overall structure in an embodiment of the present invention;

Fig. 2 is the internal structure schematic diagram of the pump body in the embodiment;

3 is a schematic diagram of the internal structure of the pump cover in the embodiment;

FIG. 4 is a schematic diagram of the structure of the outer end of the pump cover in the embodiment.

The reference numbers are:

1——Pump body 2——Pump cover 2a——Oil suction port

2b——Drain port 2c——Oil return port 3——Inner rotor

4——Outer rotor 5——Pump shaft 6a——First oil storage tank

6b——The second oil storage tank 7——The annular oil storage tank of the pump body 8——The oil lead groove of the pump body

9a——The third oil storage tank 9b——The fourth oil storage tank 10——The annular oil storage tank of the pump cover

11——Pump cover oil guide groove 12——One-way clutch 13——Annular positioning boss

14——Locating pin hole 15——Transmission gear 16——Oil guide groove of pump shaft hole

17——The oil guide groove of the shaft hole of the pump cover.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the embodiments and the accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

It should be noted in advance that, in the present invention, unless otherwise expressly specified and limited, terms such as "installation", "connection", "connection", "fixation" should be interpreted in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, in the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature. Terms "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention.

As shown in Figures 1-4, the hybrid transmission oil pump includes a pump body 1, a pump cover 2, an inner rotor 3, an outer rotor 4, and a pump passing through the shaft hole of the pump body and the shaft hole of the pump cover and connected to the inner rotor 3 Shaft 5, the right end of the pump shaft 5 protrudes from the pump body 1 and is connected with a transmission gear 15. The outer wall of the pump shaft 5 is provided with a shaft shoulder 5a, and the shaft shoulder 5a abuts against the left end face of the inner rotor 3 to the right , the bottom of the inner cavity of the pump body 1 is respectively provided with a first oil storage tank 6a and a second oil storage tank 6b at the positions of the oil suction area and the oil discharge area of the pump body 1, and the bottom of the inner cavity of the pump body 1 is provided with a pump body around the pump shaft 5 An annular oil storage tank 7, a pump body oil guide groove 8 is communicated between the pump body annular oil storage groove 7 and the second oil storage tank 6b, and a pump body shaft hole guide connected to the pump body annular oil storage groove 7 is provided on the inner wall of the pump body shaft hole. The oil tank 16, the inner end face of the pump cover 2 is respectively provided with a third oil storage tank 9a and a fourth oil storage tank 9b corresponding to the positions of the oil suction area and the oil discharge area of the pump body 1, and the inner end face of the pump cover 2 is provided with a pump around the pump shaft 5 The cover annular oil storage tank 10, the pump cover oil guiding tank 11 is communicated between the pump cover annular oil storage tank 10 and the fourth oil storage tank 9b, and the inner wall of the pump cover shaft hole is provided with a pump cover shaft hole that communicates with the pump cover annular oil storage tank 10 A one-way clutch 12 is also connected between the oil guiding groove 17 , the pump shaft 5 and the transmission gear 15 so that the transmission gear 15 can only drive the pump shaft 5 to rotate in one direction.

In the hybrid transmission oil pump provided by the above embodiment, the transmission gear 15 can generally be a helical gear structure. After the helical gear meshes with the corresponding external driving gear, the power can be transmitted to the pump shaft 5, thereby driving the pump shaft 5 to make the When the oil pump works, during the working process, the helical gear usually generates axial force, that is, the transmission gear 15 will generate a rightward axial force, so that the pump shaft 5 is subjected to a rightward force, but due to the outer wall of the pump shaft 5 The upper shaft shoulder 5a can abut against the inner rotor 3 to the right, so it can better counteract this force, so that the operation of the pump shaft 5 is more stable, and the force of the shaft shoulder 5a pressing on the inner rotor 3 can actually be further It is transmitted to the bottom surface of the inner cavity of the pump body 1.

In addition, during the operation of the hybrid transmission oil pump, the oil in the oil discharge area of the pump body 1 will enter the second oil storage groove 6b of the pump body 1 and the fourth oil outlet groove 9b of the pump cover 2, and pass through the The pump body oil guiding groove 8 and the pump cover oil guiding groove 11 enter the corresponding pump body annular oil storage groove 7 and the pump cover annular oil storage groove 10, and then enter the corresponding pump body shaft hole oil guiding groove 16 and pump cover shaft hole oil guiding groove 17, and then the pump shaft 5 and the shaft hole of the pump body and the shaft hole of the pump cover can be lubricated and cooled well. Those skilled in the art should know that due to the lubricating and cooling structure provided, in this embodiment, the pump There is no need to install sliding bushings in the shaft holes of the body 1 and the pump cover 2, so that the structural requirements of the low-pressure pump can be better met.

In addition, in the power system, the rotation of the pump shaft 5 is actually powered by the motor, and the forward and reverse rotation of the vehicle is realized by the forward and reverse rotation of the motor, so the transmission gear 15 There will be reverse rotation, so by arranging the one-way clutch 12 between the pump shaft 5 and the transmission gear 15, it can be ensured that the oil pump does not work when the transmission gear 15 rotates in the reverse direction. Of course, those skilled in the art should It is known that the structure of arranging the one-way clutch between the gear and the shaft is the prior art in the art, and there is no technical obstacle or difficulty in applying it to the oil pump, and this embodiment does not limit its specific structure. For example, the one-way clutch 12 may be a ratchet-tooth-coupling structure, etc., and thus will not be described in detail.

The above-mentioned hybrid transmission oil pump has a simple and compact structure and is easy to assemble. Its product performance, noise, and durability tests can fully meet the customer's use requirements, and can well meet the operating conditions on PHEV hybrid models.

Preferably, an oil suction port 2a and an oil discharge port 2b are respectively provided on the pump cover 2 at the positions corresponding to the oil suction area and the oil discharge area of the pump body 1, and the pump cover 2 located on the side of the oil suction port 2a is also provided with an oil suction port 2 which can be used to communicate with the drain port. The oil return port 2c of the pressure valve, and the oil discharged from the pressure relief valve can enter the oil suction area of the pump body 1 through the oil return port 2c.

More preferably, both sides of the oil suction port 2a are respectively provided with a threaded hole, both sides of the oil discharge port 2b are also respectively provided with a threaded hole, and both sides of the oil return port 2c are also provided with a threaded hole respectively. It makes the overall connection effect of the oil pump more reliable.

In addition, in this embodiment, in order to have a better positioning effect when installing the oil pump, the left end of the pump shaft 5 can be extended out of the pump cover 2, and the left end surface of the pump cover 2 can be arranged around the pump shaft 5 and The annular positioning boss 13 matched with the pump shaft 5, and then, the pump cover 2 on the side of the oil discharge port 2b is provided with a positioning pin hole 14 for matching the transmission, and the annular positioning boss 13 and the positioning pin hole 14 are correspondingly matched The positioning structure on the transmission can achieve better positioning effect, making the work of installing the oil pump more convenient and reliable.

The above-mentioned embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the technical solution.

In order to make it easier for those skilled in the art to understand the improvements of the present invention relative to the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are also omitted in this application document, One of ordinary skill in the art would realize that these omitted elements may also constitute the subject matter of the present invention.

Claims (5)

1. Hybrid transmission oil pump, including pump body (1), pump cover (2), inner rotor (3), outer rotor (4), and the shaft hole passing through the shaft hole of the pump body and the pump cover and connecting with the inner rotor (3) ) connected pump shaft (5), the right end of the pump shaft (5) protrudes from the pump body (1) and is connected with a transmission gear (15) in a driving manner, characterized in that: the pump shaft (5) has a A shaft shoulder (5a) is provided on the outer wall, the shaft shoulder (5a) abuts the left end face of the inner rotor (3) to the right, and the bottom of the inner cavity of the pump body (1) corresponds to the oil suction area of the pump body (1). A first oil storage tank (6a) and a second oil storage tank (6b) are respectively provided at the positions of 7), a pump body oil guiding groove (8) is communicated between the pump body annular oil storage tank (7) and the second oil storage tank (6b), and a pump body annular storage tank is provided on the inner wall of the pump body shaft hole. The oil tank (16) of the shaft hole of the pump body of the oil tank (7) is provided with a third oil storage tank (9a) on the inner end face of the pump cover (2) corresponding to the positions corresponding to the oil suction area and the oil discharge area of the pump body (1). and a fourth oil storage tank (9b), the inner end face of the pump cover (2) is provided with a pump cover annular oil storage tank (10) around the pump shaft (5), the pump cover annular oil storage tank (10) and the fourth storage tank (10). A pump cover oil guide groove (11) is communicated between the oil grooves (9b), and an oil guide groove (17) of the pump cover shaft hole connected to the pump cover annular oil storage groove (10) is provided on the inner wall of the pump cover shaft hole. A one-way clutch (12) for enabling the transmission gear (15) to only drive the pump shaft (5) to rotate in one direction is also connected between the pump shaft (5) and the transmission gear (15). 2 . The hybrid transmission oil pump according to claim 1 , wherein the pump cover ( 2 ) is provided with an oil suction port ( 2 a ) and a position corresponding to the oil suction area and the oil discharge area of the pump body ( 1 ), respectively. 3 . In the oil discharge port (2b), the pump cover (2) on one side of the oil suction port (2a) is also provided with an oil return port (2c) which can be used to communicate with the pressure relief valve. 3 . The hybrid transmission oil pump according to claim 2 , wherein a threaded hole is respectively provided on both sides of the oil suction port ( 2 a ), and both sides of the oil discharge port ( 2 b ) are also respectively provided with a threaded hole. 4 . There is a threaded hole, and two sides of the oil return port (2c) are also respectively provided with a threaded hole. 4. The hybrid transmission oil pump according to claim 3, wherein the left end of the pump shaft (5) protrudes from the pump cover (2), and the left end surface of the pump cover (2) surrounds the pump shaft (5) An annular positioning boss (13) matched with the pump shaft (5) is provided. 5 . The oil pump for hybrid transmission according to claim 4 , wherein the pump cover ( 2 ) on one side of the oil discharge port ( 2 b ) is provided with a positioning pin hole ( 14 ) for matching the transmission. 6 .

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