CN113669612B

CN113669612B - Transmission oil pump capable of preventing outer rotor from clamping stagnation

Info

Publication number: CN113669612B
Application number: CN202110932084.2A
Authority: CN
Inventors: 唐业和; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Oil Pump Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2023-07-04
Anticipated expiration: 2041-08-13
Also published as: CN113669612A

Abstract

The invention provides a transmission oil pump capable of preventing an outer rotor from being stuck, which comprises a pump body, an outer rotor, an inner rotor and a cover plate, wherein the pump body is provided with a round rotor cavity for accommodating the outer rotor and the inner rotor, the bottom surface of the rotor cavity is provided with a convex crescent baffle, an oil suction cavity and an oil outlet cavity which are concave downwards, the oil suction cavity and the oil outlet cavity are respectively arranged on the left side and the right side of the crescent baffle, an axial groove is arranged on the side wall of the rotor cavity corresponding to the oil outlet cavity, and the position of the axial groove is close to the crescent baffle; the lower end of the axial groove is communicated with an oil outlet cavity, and high-pressure oil in the oil outlet cavity can enter the axial groove and act on the outer peripheral surface of the outer rotor to apply inward pressure to the outer rotor. The technical scheme can correspondingly improve the stress condition and the working environment of the outer rotor, thereby avoiding clamping stagnation and ablation.

Description

Transmission oil pump capable of preventing outer rotor from clamping stagnation

Technical Field

The invention relates to the technical field of transmission lubrication hydraulic systems, in particular to a large-displacement transmission oil pump of a commercial vehicle.

Background

The heavy hydraulic automatic transmission of the commercial vehicle has higher requirements on lubrication and heat dissipation compared with a passenger vehicle due to large load, so that the displacement of the transmission oil pump is larger than that of the passenger vehicle oil pump, the structure of the transmission is compact, the low resistance of a pre-pump filtering system of the transmission oil pump is ensured under the limited volume, the filtering precision level is usually reduced to ensure that the suction capacity of the oil pump is not obviously reduced, and the transmission oil pump has more impurities and larger particles during working. In order to improve the anti-fouling capability of the transmission oil pump of the commercial vehicle, the conventional method is to properly increase the clearance between the internal relative movement parts, but the transmission oil pump also needs to provide hydraulic pressure for a hydraulic system, so the clearance between the internal relative movement parts cannot be too large, otherwise, the volumetric efficiency of the oil pump is low at high pressure, and the working pressure of the hydraulic system cannot be met. Therefore, the working environment of the heavy hydraulic automatic transmission of the commercial vehicle is worse, and the phenomenon of rotor clamping stagnation is higher than that of an oil pump of the transmission of the commercial vehicle.

Disclosure of Invention

The invention aims to provide a transmission oil pump capable of preventing an outer rotor from clamping stagnation.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a can prevent transmission oil pump of external rotor jamming, includes the pump body, external rotor, inner rotor, apron, the pump body is equipped with the circular rotor chamber that is used for holding external rotor and inner rotor, the bottom surface in rotor chamber is equipped with bellied crescent moon baffle, and concave oil absorption chamber and play oil cavity, and oil absorption chamber and play oil cavity divide and are listed in crescent moon baffle's left and right sides, rotor chamber lateral wall is equipped with an axial groove in the position of corresponding play oil cavity, and this axial groove's position is close crescent moon baffle; the lower end of the axial groove is communicated with an oil outlet cavity, and high-pressure oil in the oil outlet cavity can enter the axial groove and act on the outer peripheral surface of the outer rotor to apply inward pressure to the outer rotor.

As a preferable technical scheme, the bottom of the axial groove is arc-shaped.

The beneficial effects obtained by the invention are as follows:

1) Because the high-pressure oil in the oil outlet cavity can enter the axial groove and act on the outer peripheral surface of the outer rotor, an inward pressure is applied to the outer rotor, so that partial pressure of the internal oil pressure acting on the outer rotor can be counteracted, the force of the outer peripheral surface of the outer rotor acting on the side wall of the rotor cavity is reduced, and an oil film between the high-pressure oil and the outer peripheral surface of the outer rotor is not easy to break, thereby avoiding ablation.

2) Because the axial groove is communicated with the oil outlet cavity and is equal to the local high pressure formed at the oil outlet cavity, impurities coming along with oil in the side wall gap between the outer rotor and the rotor cavity can encounter resistance at the oil outlet cavity, and can not enter the small gap along with the rotation of the outer rotor, most of impurities can directly enter the oil outlet cavity along with the axial groove, so that the risk of the outer rotor being blocked by the impurities is reduced.

Drawings

FIG. 1 is a schematic diagram of an explosion structure of an oil pump according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a pump body according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line AA in FIG. 3;

FIG. 4 is a schematic view of the pump body of FIG. 2 with an outer rotor;

the reference numerals are:

1-oil seal 2-pump body lining 3-pump body

4-steel ball 5-spring 6-screw plug

7-outer rotor 8-inner rotor bushing 9-inner rotor

10-cover plate 11-screw 31-oil absorption cavity

32-oil outlet cavity 33-axial groove 34-crescent baffle.

Detailed Description

The invention will be further described with reference to examples and drawings, to which reference is made, but which are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other between two elements, may be directly connected, or may be indirectly connected through an intermediate medium, and the specific meaning of the terms may be understood by those skilled in the art according to circumstances.

As shown in fig. 1 to 4, a transmission oil pump capable of preventing an outer rotor from being stuck comprises an oil seal 1, a pump body bushing 2, a pump body 3, a steel ball 4, a spring 5, a screw plug 6, an outer rotor 7, an inner rotor bushing 8, an inner rotor 9, a cover plate 10 and screws 11, wherein the pump body 2 is provided with a round rotor cavity for accommodating the outer rotor 7 and the inner rotor 9, the bottom surface of the rotor cavity is provided with a convex crescent baffle 34, a concave oil suction cavity 31 and an oil outlet cavity 32, the oil suction cavity 31 and the oil outlet cavity 32 are respectively arranged on the left side and the right side of the crescent baffle 34, an axial groove 33 is arranged on the side wall of the rotor cavity corresponding to the oil outlet cavity 32, and the axial groove 33 is close to the crescent baffle 34; the bottom of the axial groove 33 is arc-shaped, the lower end of the axial groove is communicated with the oil outlet cavity 32, and high-pressure oil in the oil outlet cavity 32 can enter the axial groove 33 and act on the outer circumferential surface of the outer rotor 7 to apply inward pressure to the outer rotor 7.

As shown in fig. 4, the high-pressure oil in the oil cavity 32 acts on the inner side surface of the outer rotor 7 to generate a force F, and the axial groove 33 on the side wall of the rotor cavity introduces the high-pressure oil in the oil outlet cavity 32, so that a force F1 is generated on the outer side of the outer rotor 7, and the component force F1' =f1×sin α of the force is opposite to F, so that part of the pressure of the high-pressure oil acting on the inner side of the outer rotor can be counteracted, the force acting on the side wall of the rotor cavity on the outer peripheral surface of the outer rotor 7 becomes smaller, and the oil film between the outer peripheral surface of the outer rotor and the rotor cavity wall is difficult to break, thereby avoiding ablation.

During operation, high-pressure oil in the oil outlet cavity 32 acts on the inner side surface of the outer rotor 7 to generate a force F, so that the outer peripheral surface of the outer rotor 7 is always clung to the side wall of the rotor cavity and is biased to the side of the oil outlet cavity 32, the gap between the outer rotor 7 and the side wall of the rotor cavity gradually reduces from the oil suction cavity 31 to the oil outlet cavity 32, and impurities mixed in the gap can not be timely discharged, so that the side wall of the rotor cavity on the side of the oil outlet cavity 32 is easily worn in advance, and the outer rotor is stuck seriously. Because the axial groove is formed in the side wall of the rotor cavity and is communicated with the oil outlet cavity, the local high pressure is formed at the axial groove, impurities coming along with oil in the gap between the outer rotor and the side wall of the rotor cavity can encounter resistance at the position, and can not enter the small gap along with the rotation of the outer rotor, and most of impurities can directly enter the oil outlet cavity along with the axial groove, so that the risk that the outer rotor is blocked by the impurities is reduced.

The foregoing embodiments are preferred embodiments of the present invention, and in addition, the present invention may be implemented in other ways, and any obvious substitution is within the scope of the present invention without departing from the concept of the present invention.

In order to facilitate understanding of the improvements of the present invention over the prior art, some of the figures and descriptions of the present invention have been simplified, and some other elements have been omitted from this document for clarity, as will be appreciated by those of ordinary skill in the art.

Claims

1. The utility model provides a can prevent transmission oil pump of external rotor jamming, includes pump body (3), external rotor (7), internal rotor (9), apron (10), pump body (3) are equipped with the circular rotor chamber that is used for holding external rotor (7) and internal rotor (9), the bottom surface in rotor chamber is equipped with bellied crescent moon baffle (34) to and concave oil suction chamber (31) and play oil chamber (32), oil suction chamber (31) and play oil chamber (32) are listed as in the left and right sides of crescent moon baffle (34), thereby the medial surface that produces effort F is acted on to the high-pressure oil in play oil chamber (32) in external rotor (7), its characterized in that: an axial groove (33) is formed in the side wall of the rotor cavity and corresponds to the oil outlet cavity (32), and the axial groove (33) is close to the crescent baffle plate (34); the lower end of the axial groove (33) is communicated with the oil outlet cavity (32), high-pressure oil in the oil outlet cavity (32) can enter the axial groove (33) and act on the outer peripheral surface of the outer rotor (7), an inward acting force F1 is applied to the outer rotor (7), a component force F1 '=F1 sin alpha of the acting force F1, and the direction of the component force F1' is opposite to the direction of the acting force F.

2. The transmission oil pump capable of preventing outer rotor sticking according to claim 1, wherein: the bottom of the axial groove (33) is arc-shaped.