CN218845067U

CN218845067U - Oil pump for gearbox

Info

Publication number: CN218845067U
Application number: CN202221880765.5U
Authority: CN
Inventors: 万海江; 李耀军
Original assignee: Fuao Pump Hubei Co ltd
Current assignee: Fuao Pump Hubei Co ltd
Priority date: 2022-07-21
Filing date: 2022-07-21
Publication date: 2023-04-11
Anticipated expiration: 2032-07-21

Abstract

The utility model discloses an oil pump used on a gearbox, which comprises a pump body, a rotor pair, a transmission shaft, a pump cover and a filtering component; the outer end face of the pump body is provided with a rotor installation cavity, the cavity bottom of the rotor installation cavity is provided with a central shaft hole, the cavity bottom of the rotor installation cavity is provided with an oil inlet cavity and an oil outlet cavity in a concave mode by taking the shaft hole as a symmetric center, a rotor pair is installed in the rotor installation cavity through a transmission shaft, the pump cover is used for sealing the rotor pair, an oil inlet channel is arranged in the pump cover, the inner end of the oil inlet channel is communicated with the rotor installation cavity, the outer end aperture of the oil inlet channel is gradually increased from inside to outside, and the filtering assembly is fixed on the outer end of the oil inlet channel; the power of the oil pump comes from the gearbox, so that the oil pump can actively convey lubricating oil; in addition, the increasing aperture on the oil inlet channel plays a role in pressurization; therefore, the utility model discloses a lubricated effect is superior to traditional lubricated mode.

Description

Oil pump for gearbox

Technical Field

The utility model belongs to automobile engine transmission system field, especially an oil pump for on gearbox.

Background

On a traditional medium and small power gear box, gears are basically lubricated in a splash mode. With the improvement of the technology, the efficiency and power of the engine are greatly improved, and a gearbox matched with the engine also needs to be synchronously upgraded to improve the transmission power and efficiency of the engine. Increasing active lubrication is a technical measure to improve the transmission power and efficiency of the transmission. The oil pump in the patent can change the gearbox in a small range on the premise of keeping the integral structure of the original gearbox, and can realize the technical upgrade of active lubrication of the gearbox.

Disclosure of Invention

The utility model provides an oil pump for on gearbox, the purpose is in order to solve traditional lubricated mode and have the poor problem of effect.

In order to solve the technical problem, the technical scheme of the utility model is that: an oil pump for a transmission, characterized by: the pump comprises a pump body, a rotor pair, a transmission shaft, a pump cover and a filtering assembly; the outer end face of the pump body is provided with a rotor installation cavity, the cavity bottom of the rotor installation cavity is provided with a central shaft hole, the cavity bottom of the rotor installation cavity is provided with an oil inlet cavity and an oil outlet cavity in a concave mode by taking the shaft hole as a symmetric center, a rotor pair is installed in the rotor installation cavity through a transmission shaft, the pump cover is used for sealing the rotor pair, an oil inlet channel is arranged in the pump cover, the inner end of the oil inlet channel is communicated with the rotor installation cavity, the outer end aperture of the oil inlet channel is gradually increased from inside to outside, and the filtering assembly is fixed on the outer end of the oil inlet channel; the inner end face of the pump body can be attached to a corresponding mounting face in the gearbox, the inner end cavity of the pump body can be in limit fit with a bearing on the gearbox, the other end of the transmission shaft penetrates through the inner end cavity of the pump body, and the other end of the transmission shaft is used for being connected with a power shaft of the gearbox.

The technical scheme is further limited, and the oil inlet cavity and the oil outlet cavity are arc-shaped.

The technical scheme is further limited, a plurality of mounting holes are circumferentially distributed on the inner end part of the pump body, and the common edge of the adjacent mounting holes is arc-shaped.

The technical scheme is further improved, and a plurality of process grooves are circumferentially distributed on the inner end part of the pump body.

The technical scheme is further limited, and the cross section of the inner end cavity of the pump body is step-shaped.

The technical scheme is further limited, the rotor pair consists of an inner rotor and an outer rotor, the inner rotor is fixedly connected with the transmission shaft, the upper tooth surface, the lower tooth surface and the tooth root surface of adjacent teeth on the inner rotor form a complete concave arc surface, and the top surface of each tooth is an arc surface; the inner ring teeth of the outer rotor are matched with the teeth parts on the inner rotor.

Further inject above-mentioned technical scheme, filtering component comprises rack and filter screen, and the circumference distributes on the limit portion of rack has a plurality of jack catchs, the window at the rack is fixed to the filter screen.

The utility model discloses beneficial effect: the power of the oil pump comes from the gearbox, so that the oil pump can actively convey lubricating oil; in addition, the increasing aperture on the oil inlet channel plays a role in pressurization; therefore, the utility model discloses a lubricated effect is superior to traditional lubricated mode.

Drawings

Fig. 1 is a sectional view of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is an exploded schematic view of the present invention.

Fig. 4 is a schematic view of the outer end of the pump body.

Fig. 5 is a schematic diagram of the structure of the middle rotor pair of the present invention.

Detailed Description

As shown in fig. 1, fig. 2 and fig. 3, an oil pump for a transmission includes a pump body 1, a rotor pair 2, a transmission shaft 3, a pump cover 4 and a filter assembly 5; the outer end face of the pump body 1 is provided with a rotor installation cavity 101, the cavity bottom of the rotor installation cavity is provided with a central shaft hole 102, an oil inlet cavity 103 and an oil outlet cavity 104 are recessed in the cavity bottom of the rotor installation cavity by taking the shaft holes as symmetrical centers, a transmission shaft is in rotary connection with the shaft holes through bearings, a rotor pair is installed in the rotor installation cavity through the transmission shaft, a pump cover is connected with the pump body through screws and used for sealing the rotor pair, an oil inlet channel 401 is arranged in the pump cover 4, the inner end of the oil inlet channel is communicated with the rotor installation cavity, the inner end of the oil inlet channel is opposite to the oil inlet cavity on the pump body, the outer end aperture of the oil inlet channel is increased from inside to outside, and a filter assembly is fixed on the outer end of the oil inlet channel; the inner end surface of the pump body can be attached to a corresponding mounting surface in the gearbox, so that the sealing effect of the joint is facilitated; the cavity at the inner end of the pump body can be in limit fit with a bearing on the gearbox, so that the coaxiality of the transmission shaft and a power shaft in the gearbox can be kept; the other end of the transmission shaft penetrates through the inner end cavity of the pump body, and the other end of the transmission shaft is used for connecting a power shaft of the gearbox; namely, the end part of the transmission shaft is flat and can be inserted into the power shaft to realize the synchronous rotation of the transmission shaft and the power shaft;

as shown in fig. 3, the oil inlet cavity 103 and the oil outlet cavity 104 are circular arc-shaped; in a limited space, an arc-shaped oil cavity is adopted to ensure that sufficient oil quantity exists and reduce the abrasion of the end surface of the rotor pair;

as shown in fig. 2, 3 and 4, four mounting holes 105 are circumferentially distributed on the inner end portion of the pump body 1, fastening screws are arranged in the four mounting holes, and a common edge 106 of adjacent mounting holes is arc-shaped; the structure is convenient to assemble, disassemble and maintain, and the arc-shaped edge is beneficial to processing, manufacturing and light weight;

as shown in fig. 2 and 3, a plurality of process grooves 107 are circumferentially distributed on the inner end portion of the pump body 1; the process groove is beneficial to processing and manufacturing and light weight;

as shown in fig. 4, the cross section of the inner end cavity of the pump body 1 is stepped 108, so that the universality can be provided, and the pump body is suitable for bearings with various outer diameters;

as shown in fig. 5, the rotor pair 2 is composed of an inner rotor 201 and an outer rotor 202, the inner rotor is fixedly connected with the transmission shaft, the upper tooth surface, the lower tooth surface and the tooth root surface of the adjacent teeth on the inner rotor form a complete concave arc surface 203, and the top surface of each tooth is an arc surface; the inner ring teeth of the outer rotor are matched with the teeth parts on the inner rotor;

as shown in fig. 4, the filtering assembly comprises a net rack and a filter screen, a plurality of claws are circumferentially distributed on the edge of the net rack, and the filter screen is fixed in a window of the net rack; and the clamping mode is adopted, so that the assembly and the maintenance are convenient.

The utility model discloses the theory of operation: 1) The power source of the oil pump comes from the gearbox. When the gearbox is started, a power shaft on the gearbox drives a transmission shaft to drive a rotor pair to move, so that lubricating oil in an oil pool of the gearbox flows into a gearbox speed change assembly through an oil inlet channel, an oil inlet cavity, the rotor pair, an oil outlet cavity and an oil outlet channel in a pump body; 2) The outer rotor is driven by the inner rotor to rotate simultaneously in a gear transmission mode. The gear engagement law is as follows: the closed area formed by the gear tooth profiles of the inner rotor and the outer rotor is arranged on one side of the oil inlet cavity, the volume space of the closed area is gradually enlarged along the rotation direction of the rotor, a certain vacuum degree negative pressure is formed inside the closed area, and external engine oil enters the oil inlet cavity of the oil pump under the action of atmospheric pressure and fills the closed area of the tooth profiles of the inner rotor and the outer rotor. In the inner and outer rotor dividing zone area, the closed area volume reaches the maximum, and the filled engine oil amount reaches the maximum. Along with the rotation of the inner rotor and the outer rotor, the tooth profile closed area of the inner rotor and the tooth profile closed area of the outer rotor enter one side of the oil outlet cavity. Due to the gear meshing rule, when a closed area formed by the gear tooth profiles of the inner rotor and the outer rotor is arranged on one side of the oil outlet cavity, the volume space of the closed area is gradually reduced along the rotation direction of the rotor, and high pressure is formed inside the closed area. Under the action of pressure, engine oil in the closed area is squeezed into the oil outlet cavity, the pressure in the oil outlet cavity is increased, and the engine oil is further squeezed into the oil outlet from the oil outlet cavity to be discharged.

Claims

1. An oil pump for a transmission, characterized by: the pump comprises a pump body, a rotor pair, a transmission shaft, a pump cover and a filtering assembly; the outer end face of the pump body is provided with a rotor mounting cavity, the cavity bottom of the rotor mounting cavity is provided with a central shaft hole, the cavity bottom of the rotor mounting cavity is concavely provided with an oil inlet cavity and an oil outlet cavity by taking the shaft hole as a symmetrical center, a rotor pair is mounted in the rotor mounting cavity through a transmission shaft, the pump cover is used for sealing the rotor pair, an oil inlet channel is arranged in the pump cover, the inner end of the oil inlet channel is communicated with the rotor mounting cavity, the outer end aperture of the oil inlet channel is gradually increased from inside to outside, and the filtering assembly is fixed on the outer end of the oil inlet channel; the inner end face of the pump body can be attached to a corresponding mounting face in the gearbox, the inner end cavity of the pump body can be in limit fit with a bearing on the gearbox, the other end of the transmission shaft penetrates through the inner end cavity of the pump body, and the other end of the transmission shaft is used for being connected with a power shaft of the gearbox.

2. The oil pump for a transmission according to claim 1, wherein: the oil inlet cavity and the oil outlet cavity are arc-shaped.

3. The oil pump for a transmission according to claim 1 or 2, characterized in that: a plurality of mounting holes are circumferentially distributed on the inner end part of the pump body, and the common edge of the adjacent mounting holes is arc-shaped.

4. The oil pump for a transmission according to claim 3, wherein: a plurality of process grooves are circumferentially distributed on the inner end edge part of the pump body.

5. The oil pump for a transmission according to claim 1 or 2, characterized in that: the cross section of the inner end cavity of the pump body is step-shaped.

6. An oil pump for a transmission according to claim 5, wherein: the rotor pair consists of an inner rotor and an outer rotor, the inner rotor is fixedly connected with the transmission shaft, the upper tooth surface, the lower tooth surface and the tooth root surface of adjacent tooth parts on the inner rotor form a complete concave arc surface, and the top surface of each tooth part is an arc surface; the inner ring teeth of the outer rotor are matched with the teeth on the inner rotor.

7. The oil pump for a transmission according to claim 1 or 2, characterized in that: the filtering component comprises rack and filter screen, and the circumference distributes on the limit portion of rack has a plurality of jack catchs, the window at the rack is fixed to the filter screen.