CN114483567A

CN114483567A - Scavenge pump, scavenge pump assembly method and hydraulic device

Info

Publication number: CN114483567A
Application number: CN202111524780.6A
Authority: CN
Inventors: 郭宏达; 李其儒
Original assignee: Yima Electric Control Co ltd
Current assignee: Yima Electric Control Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-05-13

Abstract

The invention discloses a scavenging pump, which comprises a blocking piece, a piston piece and an elastic piece, wherein the blocking piece is connected with the piston piece, and the elastic piece is arranged between the blocking piece and the piston piece. The plugging piece comprises a plug, a valve body connected with the plug, an elastic unit arranged between the plug and the valve body, and a first ball body arranged between the elastic unit and the valve body. The piston piece includes valve port lid, piston, second spheroid, plunger, first sealing washer and second sealing washer, and wherein the both ends of piston are connected with valve port lid and plunger respectively, and the second spheroid is located between valve port lid and the piston, first sealing washer, and the second sealing washer encircles respectively and establishes piston and plunger outer surface.

Description

Scavenge pump, scavenge pump assembly method and hydraulic device

Technical Field

The present invention relates to a scavenging pump, a scavenging pump assembling method and a hydraulic device, and more particularly to a scavenging pump capable of being assembled to a hydraulic device in a sectional manner and an assembling method thereof.

Background

In response to driving safety, most vehicles today are equipped with Anti-lock Braking systems (Anti-lock Braking systems) capable of controlling the Braking of the wheels, and adjusting the actuating force to avoid the vehicle from being out of control due to tire locking or slipping when driving in an emergency or road environment is not good.

The general anti-deadlock braking system can adjust the actuating force by combining software (such as a calculation program), hardware (such as a controller) and a transmission mechanism, so as to enhance the maneuverability of the vehicle under various conditions. While the hydraulic device used in the anti-deadlock braking system is currently the mainstream of the transmission mechanism, the hydraulic device used in the anti-deadlock braking system usually has a plurality of components, requires a plurality of processes during assembly, and has a high standard requirement on sealing performance, so welding is a common fitting sealing means.

However, although welding is easy to be performed on complex joint surfaces of components, it is not shock-resistant and high-temperature resistant, and the hydraulic device equipped with a motor and a pump is capable of responding to shock and hot air generated during operation, and after a long time, the sealing performance of the components in the hydraulic device is in doubt gradually weakened, especially when emergency braking is performed under driving conditions, the shock and high temperature generated by the hydraulic device in high-speed operation can also directly cause the welded components to be broken and separated, so that the anti-deadlock braking system is disabled.

The scavenge pump as a unit for regulating the amount of oil in the hydraulic device needs to be actuated quickly and intermittently, and particularly, stress and vibration are generated during operation, so that it needs to be arranged closely in the hydraulic device. However, the conventional oil return pump has a complicated assembly process, is not easily placed in the base of the hydraulic device, and has a poor degree of connection with the base, and the conventional method of fixing the oil return pump in the hydraulic device by welding also has an effect on the manufacturing cost and the product quality because the welding quality is difficult to control.

Disclosure of Invention

Therefore, in order to overcome the disadvantages of the prior art, the component parts of the scavenging pump of the embodiment of the invention are divided into three components which can be preassembled: the blocking piece, the piston piece and the elastic piece are combined simply by using the improved structure of the components, and the oil return pump is fixedly sealed in the body of the hydraulic device by using a pressing riveting mode. Therefore, the assembly of the components of the sealed hydraulic device by welding can be avoided, and the driving safety is improved.

In view of at least one of the above-mentioned objects, the assembling method of the scavenging pump according to the embodiment of the present invention is to pre-assemble the components of the scavenging pump in a sectional manner into three parts, i.e., the plug, the piston member and the elastic member, then to sequentially place the piston member, the elastic member and the plug into the installation groove of the body of the hydraulic device, and finally to perform press-riveting to fix the scavenging pump in the body of the hydraulic device. The sectional oil return pump assembling method can make the procedure of assembling each component into the setting groove adopt proper configuration method according to the function of each component, not only simplifies the assembling procedure to make the oil return pump easily set into the hydraulic device, but also improves the strength of the assembled oil return pump and the combination degree between the assembled oil return pump and the hydraulic device.

In view of at least one of the above-mentioned objects, a hydraulic apparatus according to an embodiment of the present invention includes a body, a scavenge pump, and a hydraulic component (such as, but not limited to, a motor, a pressure increasing valve, a pressure reducing valve, an electronic control unit, etc.) assembled in the body, wherein the body has a setting groove for accommodating the scavenge pump therein, and the scavenge pump assembled in the setting groove in a segmented manner corresponds to a portion of the setting groove for accommodating the components due to the shape of the components, so that the scavenge pump can be tightly and precisely attached to the inner wall of the setting groove, thereby improving the degree of connection between the scavenge pump and the body of the hydraulic apparatus and enhancing the structural relationship between the scavenge pump and the hydraulic apparatus.

In view of at least one of the above objects, an embodiment of the present invention provides a scavenging pump including a plug, a piston member, and an elastic member, wherein the plug and the piston member are connected, and the elastic member is disposed therebetween. The plug comprises a plug, a valve body, an elastic unit and a first ball body, wherein the valve body is connected with the plug, the elastic unit is arranged between the plug and the valve body, and the first ball body is arranged between the elastic unit and the valve body. The piston piece contains valve port lid, piston, second spheroid, plunger, first sealing washer and second sealing washer, and wherein piston connection valve port lid and plunger, the second spheroid is located between valve port lid and the piston, and piston and plunger outer surface are established respectively to first sealing washer and second sealing washer ring.

Optionally, the first connecting end and the second connecting end of the piston are connected to the valve body and the plunger respectively, the outer diameter of the first connecting end is larger than that of the second connecting end, the inner diameter of the valve body is approximately equal to that of the first connecting end of the piston, and the outer diameter of the plunger is smaller than that of the second connecting end of the piston.

Optionally, the piston is a hollow column having two hollow sections, the inner diameters of the two hollow sections are not equal.

Optionally, the scavenging pump further includes two gaskets respectively disposed on two sides of the first sealing ring.

Optionally, the scavenging pump further includes an oil inlet through hole provided in the piston and an oil outlet through hole provided in the valve body.

Optionally, the first sealing ring is an X-shaped sealing ring, the second sealing ring is an O-shaped sealing ring, the elastic member and the elastic unit are springs, and the first ball body and the second ball body are steel balls.

In view of at least one of the above objects, an embodiment of the present invention provides an assembling method for a scavenging pump, which is applied to a device having an oil inlet channel, an oil outlet channel and a mounting groove, the assembling method comprising: assembling a piston member; prepressing the assembled piston piece in an interference fit manner in a setting groove of the device, wherein the setting groove is close to one end of the oil inlet channel; placing the elastic element into the setting groove to contact with the valve cover; assembling the plug; prepressing the assembled plug in the setting groove in an interference configuration mode, wherein the piston piece, the elastic piece and the plug form an oil return pump; and the oil return pump is fixed in the setting groove in a riveting mode.

Optionally, the step of pre-pressing the plug in the installation slot includes connecting the valve body of the plug with the piston of the piston member, so that the elastic member is confined between the plug and the piston member.

In view of at least one of the above-mentioned objects, an embodiment of the present invention provides a hydraulic apparatus, which includes a body having a setting groove, a scavenge pump disposed in the setting groove, and a hydraulic assembly assembled to the body, wherein an outer surface of a first seal ring and an outer surface of a second seal ring of the scavenge pump are respectively attached to an inner wall of the setting groove.

Optionally, the piston of the scavenging pump is a cylinder, and the outer surface of the part with the largest outer diameter is attached to the inner wall of the setting groove.

In brief, the scavenge pump, the assembly method of the scavenge pump and the hydraulic device provided by the embodiments of the present invention utilize an improved structure of scavenge pump components, such as three components (a plug, a piston and an elastic component) that can be pre-assembled, so as to simplify the combination relationship thereof, thereby reducing the assembly procedure and avoiding the need of welding for sealing. Therefore, the sealing performance and durability of the hydraulic device can be improved by the fixing method of the rivet pressing, and the driving safety can be further ensured, so that the hydraulic device has advantages in various markets (such as vehicle manufacturers, locomotive manufacturers, ABS manufacturers and the like) requiring the hydraulic device.

The foregoing and other objects, features, and advantages of the invention will be apparent from the following more particular description of the invention, as illustrated in the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of a scavenge pump according to an embodiment of the present invention.

Fig. 2 is an exploded view of a scavenge pump according to an embodiment of the present invention.

FIG. 3 is a sectional view of the scavenge pump of an embodiment of the present invention assembled to the hydraulic device body

FIG. 4 is a flow chart of a scavenge pump assembly method according to an embodiment of the present invention.

Fig. 5 is a sectional view of a hydraulic apparatus according to an embodiment of the present invention.

The reference numbers illustrate:

1: a hydraulic device;

10: a body;

11: arranging a groove;

13: arranging a groove;

20: a drive unit;

40: an oil return pump;

41: plugging pieces;

42: an elastic member;

43: a piston member;

101: an oil inlet channel;

102: an oil outlet channel;

411: a plug;

412: an elastic unit;

413: a first sphere;

414: a valve body;

431: a valve port cover;

432: a second sphere;

433: a first seal ring;

434: a piston;

435: a plunger;

436: a second seal ring;

4141: a through hole;

4142: an oil outlet hole;

4331: a gasket;

4332: a gasket;

4341: a through hole;

4342: an oil inlet hole;

D1-D6: a diameter;

s101 to S107: and (5) flow steps.

Detailed Description

For a fuller understanding of the objects, features and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.

The embodiment of the invention provides a scavenging pump, which can be preassembled into three parts: a plug, a piston member and an elastic member. The body of the hydraulic device has a plurality of connecting installation slots for installing the scavenge pump and other components (such as but not limited to motor, pressure increasing valve, pressure reducing valve, etc.) respectively, wherein the plug of the scavenge pump, the piston member and the elastic member can be installed to one of the installation slots of the body in a sectional manner. Because each part of the scavenging pump has a combined structure matched with the installation groove of the body, the combination of each part and the body in the scavenging pump after being assembled is more stable, and the assembly process can be simplified. Therefore, the embodiment of the invention also provides an assembling method of the scavenging pump and a hydraulic device.

First, referring to fig. 1, fig. 2 and fig. 3, a schematic diagram, an exploded view and a cross-sectional view of a scavenge pump and a body assembled to a hydraulic device according to an embodiment of the present invention are shown. The scavenge pump 40 is generally cylindrical, has a plug end and an opposite plunger end, and can be divided into three parts: a plug 41, an elastic member 42 and a piston member 43, wherein the plug 41 is located at the plug end of the scavenge pump 40, the piston member 43 is located at the plunger end of the scavenge pump 40, and the elastic member 42 is located between the plug 41 and the piston member 43. The plug 41 comprises a plug 411, an elastic unit 412, a first ball 413 and a valve body 414, wherein the plug 411 is arranged at the plug end of the scavenging pump 40, the elastic unit 412 and the first ball 413 are arranged in the plug 411, and the valve body 414 is connected with the plug 411, so that the elastic unit 412 and the first ball 413 are limited between the two. The elastic unit 412 has one end abutting against the plug 411 and the other end abutting against the first ball 413, and the first ball 413 blocks the through hole 4141 of the valve body 414 in a normal state (such as, but not limited to, a rest state or a non-operating state). The valve body 414 has a space therein for accommodating the elastic member 42.

Specifically, the plug 411 is a cylinder with a receiving space therein, and has an opening at one end communicating with the receiving space and a closed surface at the other end. The elastic unit 412 and the first ball 413 are disposed in the accommodating space through the opening of the plug 411. The valve body 414 is a cylinder with a receiving space therein, and has an opening at one end communicating with the receiving space and a closed surface at the other end having a through hole 4141, wherein the through hole 4141 communicates with the receiving space. The valve body 414 is connected to the end of the plug 411 with an opening at the end of the closed surface with a through hole 4141, and the elastic unit 412 and the first ball 413 are limited between the two, so as to form the plug 41.

The piston member 43 includes a valve cover 431, a second ball 432, a first sealing ring 433, a piston 434, a plunger 435, and a second sealing ring 436, wherein the plunger 435 is disposed at the plunger end of the recirculating pump 40, and the second sealing ring 436 is disposed around the outer surface of the plunger 435. The piston 434 is connected to the valve port cover 431 and the plunger 435 at two ends thereof, the first sealing ring 433 is disposed around the outer surface of the piston 434, and the second ball 432 is accommodated between the valve port cover 431 and the piston 434. In a normal state (such as but not limited to a rest state or a non-operating state), the second ball 432 blocks the through hole 4341 of the piston 434. One end of the piston 434 connected to the valve cover 431 is also connected to the space of the valve body 414, so that the piston 434 is connected to the valve body 414, and two ends of the elastic member 42 respectively abut against the valve body 414 and the valve cover 431.

In detail, the piston 434 is a substantially cylindrical body having a first connection end and a second connection end at two ends, wherein an outer diameter D1 of the first connection end is larger than an outer diameter D2 of the second connection end. The piston 434 is also a hollow cylinder with two hollow sections therein, wherein the two hollow sections are connected, the first hollow section is connected to the through hole 4341, and the inner diameter D5 of the first hollow section is smaller than the inner diameter D6 of the second hollow section. In addition, the first hollow section is adjacent to the first connection end and the second hollow section is adjacent to the second connection end. In this embodiment, the length of the first hollow section is not equal to the length of the first connection end, and the length of the second hollow section is not equal to the length of the second connection end, but the invention does not limit the arrangement of the hollow section of the piston and the corresponding outer diameter of the cylinder. The first connecting end of the piston 434 includes a snap structure for engaging with the valve cap 431 to connect the valve cap 431 and the piston 434. The valve port cover 431 is, for example but not limited to, a circular cap shape, which includes a plurality of holes disposed on an arc-shaped wall of the circular cap, the second ball 432 is received in the circular cap, and a part of the inner wall of the circular cap and the skirt are engaged with the fastening structure of the piston 434, but the invention is not limited to the fastening structure and the connection relationship and manner with the valve port cover 431. Thus, the valve cap 431 is fixedly disposed on the first connection end of the piston 434 and limits the second ball 432 between the valve cap 431 and the piston 434, the piston 434 is connected to the plunger 435 through the second connection end, wherein the plunger 435 is approximately cylindrical, the outer diameter D3 of the plunger 435 is smaller than the outer diameter D2 of the second connection end of the piston 434 but larger than the inner diameter D6 of the second hollow section, and the first sealing ring 433 and the second sealing ring 436 are respectively sleeved on the outer surface of the first connection end of the piston 434 and the outer surface of the plunger 435 to form the piston member 43.

In one embodiment, the piston member 43 further includes two

gaskets

4331, 4332 respectively disposed on two opposite sides of the first sealing ring 433, that is, the two

gaskets

4331, 4332 are also sleeved on the outer surface of the first connection end of the piston 434. In addition, scavenge pump 40 further includes an oil inlet 4342 at the second end of piston 434 and an oil outlet 4142 at the side wall of valve body 414 at the end with through hole 4141 to allow oil to enter and exit scavenge pump 40.

The elastic member 42 is located in the accommodating space of the valve body 414, and one end of the elastic member 42 abuts against the inner wall of the accommodating space of the valve body 414, and the other end abuts against the valve cover 431. The first connecting end of the piston 434 of the piston member 43 is connected to the opening end of the valve body 414 of the plug member 41, wherein the outer diameter D1 of the first connecting end of the piston 434 is approximately equal to the inner diameter D4 of the accommodating space of the valve body 414, and after the connection, the elastic member 42 is limited between the piston member 43 and the plug member 41, thereby forming the scavenging pump 40.

In an embodiment, the elastic unit 412 and the elastic element 42 are return springs, the first ball 413 and the second ball 432 are steel balls with the same size, the first sealing ring 433 is an X-shaped sealing ring, and the second sealing ring 436 is an O-shaped sealing ring, but the invention is not limited thereto.

Referring to fig. 5, fig. 5 is a cross-sectional view of a hydraulic apparatus with a scavenging pump according to an embodiment of the present invention. When the scavenging pump 40 is assembled in the installation groove 13 of the body 10 of the hydraulic device 1, the three pre-assembled components of the scavenging pump 40, the blocking member 41, the elastic member 42 and the piston member 43, are assembled into separate components, so that the scavenging pump 40 can be installed in the installation groove 13 only by sequentially placing the three components into the installation groove 13 and fixedly sealing the three components. Specifically, the assembled piston 43 is first placed into the installation groove 13 by the end of the plunger 435, so that the outer surface of the piston 434 (especially, the outer surface of the first connection end having the maximum outer diameter D1) is attached to the inner wall of the installation groove 13, and the first sealing ring 433 and the second sealing ring 436 are respectively disposed in the installation groove 13 in an interference fit manner, so that the outer surface of the first sealing ring 433 and the outer surface of the second sealing ring 436 are closely attached to the inner wall of the installation groove 13, thereby fixing the piston 43 and achieving the sealing effect. The end of the piston 435 not connected to the piston 434 enters another installation slot 11 communicating with the installation slot 13 and is drivingly connected to a driving unit 20. Next, the elastic member 42 is placed in the setting groove 13 adjacent to the piston member 43. Then, the assembled plug 41 is inserted into the installation groove 13 in an interference manner, wherein the elastic member 42 is covered in the accommodation space of the valve body 414 by the valve body 414 of the plug 41. After all three components are pre-pressed in the installation groove 13 of the body 10, the scavenge pump 40 is fixed to the body 10 by caulking.

According to the structure and arrangement of the scavenge pump 40, in addition to reducing the number of parts of the scavenge pump 40, the scavenge pump 40 can be pre-assembled into three parts, which simplifies the steps and procedures for assembling the scavenge pump 40 to the body 10 of the hydraulic device 1.

Next, an assembly process of the scavenging pump according to the embodiment of the present invention will be described. Referring to fig. 4, the scavenging pump 40 is suitable for being assembled to the hydraulic apparatus 1 having the main body 10, and therefore in step S101, the main body 10 of the hydraulic apparatus 1 is provided, wherein the main body 10 has been provided with the installation groove 13, the oil inlet passage 101 and the oil outlet passage 102. The setting tank 13 has a plurality of sections of spaces, the inner diameters of the sections of spaces are different, wherein the inner diameters of the sections of spaces from outside to inside (the direction in which the outer surface opening of the body 10 extends toward the inside of the setting tank 13) are configured to be gradually reduced from large to small.

Next, in step S102, the piston member 43 is assembled, which includes placing the second ball 432 into the valve port cover 431 and combining the end (the first connection end) of the piston 434 having the through hole 4341 with the opening of the valve port cover 431, so that the second ball 432 is limited in the valve port cover 431. Further, the piston 435 is coupled to the second coupling end of the piston 431 in an interference fit manner, and a first sealing ring 433 and a second sealing ring 436 are respectively fitted over the outer surfaces of the piston 434 and the piston 435. In step S103, the assembled piston member 43 is inserted into the setting groove 13 with the axis perpendicular to the direction of the opening of the outer surface of the body and the plunger 435 facing inward, and is pre-pressed to one end of the setting groove 13 of the body 10 close to the oil inlet channel 101 in an interference manner, wherein the first sealing ring 433 and the second sealing ring 436 are respectively clamped at the joint surfaces of different segment spaces in the setting groove 13, the outer side surfaces of the first sealing ring 433 and the second sealing ring 436 are respectively tightly attached to the inner wall of the setting groove 13, and a part of the outer surface of the maximum outer diameter (the first connection end) of the piston 434 is also attached to the inner wall of the setting groove 13, so that the piston member 43 is positioned in the setting groove 13.

In step S104, the elastic member 42 is inserted into the installation groove 13 of the body 10 in a direction perpendicular to the opening of the outer surface of the body with its axis in contact with the valve port cover 431 of the piston member 43.

In step S105, the assembling of the plug 41 is performed, which includes placing the elastic unit 412 and the first ball 413 into the accommodating space of the plug 411, and combining the end of the valve body 414 with the through hole 4141 and the end of the plug 411 with the opening of the accommodating space in an interference manner, thereby completing the assembling of the plug 41. In step S106, the assembled plug 41 is inserted into the installation groove 13 with the axis perpendicular to the direction of the opening on the outer surface of the body and the valve body 414 facing inward, and is pre-pressed to the end of the installation groove 13 of the body 10 close to the oil outlet channel 102 in an interference manner, wherein the opening of the valve body 414 is combined with the first connection end of the piston 434 in an interference manner, and the elastic element 42, the valve port cover 431 and the second sphere 432 are accommodated therein, thereby forming the oil return pump 40. In addition, the valve body 414 is engaged with the interface of the different segment spaces in the installation groove 13, so that the plug 41 is positioned in the installation groove 13.

In step S107, the plug end of the scavenging pump 40 (i.e., the plug 411 of the plug 41) is press-riveted and fixed, and the scavenging pump 40 is fixed to the installation groove 13 of the body 10.

As mentioned above, the scavenging pump 40 can be assembled in three parts sequentially, wherein the blocking member 41 and the piston member 43 are parts which can be assembled in advance, in this embodiment, the elastic member 42 is a single component and thus does not need to be assembled in advance, but the invention is not limited thereto, and if the elastic member 42 includes a plurality of parts, it can be assembled in advance.

In addition, in the present embodiment, the blocking member 41 and the piston member 43 are pre-assembled before being assembled to the body 10 of the hydraulic device 1 (as in steps S102 and S105), but the present invention is not limited to the assembling sequence of the blocking member 41, the elastic member 42 and the piston member 43, and the blocking member 41, the elastic member 42 and the piston member 43 may be assembled before the components are assembled to the body 10.

In one embodiment, the plug 41, the elastic member 42 and the piston 43 are assembled before the assembly process to the body 10 is performed. First, the piston member 43 is inserted into the installation groove 13 in a direction in which the plunger 435 (i.e., the piston end of the scavenging pump 40) faces the installation groove 13, so that the outer surface of the piston member 43 is closely attached to the inner wall of the installation groove 13. Then, the elastic member 41 is placed in the installation groove 43 and contacts the valve cover 431 of the piston member 43. Then, the plug 41 is inserted into the installation groove 13 in a direction in which the valve body 414 faces the installation groove 13, so that the outer surface of the plug 41 is closely adhered to the inner wall of the installation groove 13.

Among them, the three components may be connected by a pre-pressure method to form the scavenge pump 40. The flow of pre-pressing may be to place three components into the installation groove 13 and then perform one-time pre-pressing, or to place one component each time and then perform one-time pre-pressing, which is not limited in the present invention.

After the scavenging pump 40 is assembled to the installation groove 13 of the body 10, an oil inlet chamber communicating with the piston member 43 is formed at a position of the installation groove 13 adjacent to the oil inlet passage 101 of the body 10, and an oil outlet chamber communicating with the blocking member 41 is formed at a position of the installation groove 13 adjacent to the oil outlet passage 102 of the body 10, wherein actuating fluid (such as, but not limited to, oil) in the hydraulic apparatus 1 can enter the oil inlet chamber through the oil inlet passage 101 of the body 10, flow into the piston member 43 through the oil inlet hole of the piston 434, and flow into the valve body 414 of the blocking member 41 through the through hole 4341 and the hole of the valve cover 414 when the second ball 432 is forced to move away from the through hole 4341. When the first ball 413 is forced to move away from the through hole 4141, the actuating liquid flows into the oil outlet chamber through the through hole 4141 and the oil outlet hole 4142 and is discharged back to the oil pump 40 by the oil outlet passage 102. The flow of priming liquid depends on the operation of the scavenge pump 40, and the scavenge pump 40 drives the piston member 43 by the drive unit 20, which in turn generates internal high and low pressures and misalignment of components, initiating the flow of priming liquid.

In one embodiment, the hydraulic device 1 is a device for preventing brake deadlock, the body 10 is a base, the driving unit 20 is a motor, the scavenge pump 40 is connected to the motor in a transmission manner through the arrangement of components, such as but not limited to, bearings and rotating components, between the scavenge pump 40 and the motor, the rotating components are driven and indirectly drive the scavenge pump to operate, by means of the arrangement of the

grooves

11 and 13, which are formed in the body 10 and are communicated with each other. The present invention is not limited by the type or configuration of the devices and units.

In view of the above, compared with the conventional art, the technical effects of the scavenging pump, the assembling method and the hydraulic device according to the embodiments of the present invention are described as follows.

In the known technology, a plurality of components of the hydraulic device are fixed and sealed in a welding mode, but the sealing performance of the components can be directly influenced by the welding quality, and welded joints are not shock-resistant and high-temperature-resistant, so that the safety is doubtful when the hydraulic device is operated. In contrast to the hydraulic apparatus according to the embodiment of the present invention, the structural simplification of the components is used, and the riveting technique can be used to achieve the required sealing performance without welding, thereby ensuring that the components are not damaged or broken due to the vibration and high temperature generated by high-speed operation. Furthermore, the assembly method of the present invention can pre-assemble the scavenging pump into three parts, thereby reducing the process of assembling the scavenging pump to the body and further improving the assembly efficiency. Furthermore, compared with the conventional oil return pump, most of the whole outer surface of the oil return pump disclosed by the embodiment of the invention is attached to the inner wall of the hydraulic device, so that the oil return pump is more tightly combined with the hydraulic device, the sealing performance is enhanced, and the displacement of the oil return pump is also prevented.

While the invention has been described in terms of preferred embodiments, it will be understood by those skilled in the art that the foregoing embodiments are illustrative of the invention and are not to be construed as limiting the scope of the invention. It should be noted that equivalent variations and substitutions to those of the foregoing embodiments are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention should be determined by the claims.

Claims

1. A scavenge pump, comprising:

a closure, comprising:

a plug;

a valve body connected to the plug;

the elastic unit is arranged between the plug and the valve body; and

the first ball is arranged between the elastic unit and the valve body;

a piston member, comprising:

a valve port cover;

a piston connected to the valve cap;

the second ball is arranged between the valve port cover and the piston;

a plunger connected to the piston;

the first sealing ring is annularly arranged on the outer surface of the piston; and

the second sealing ring is annularly arranged on the outer surface of the plunger; and

an elastic member is arranged between the blocking member and the piston member.

2. The recirculating pump of claim 1 wherein the first connecting end and the second connecting end of the piston are connected to the valve body and the plunger, respectively, the first connecting end having an outer diameter greater than an outer diameter of the second connecting end, the valve body having an inner diameter approximately equal to the outer diameter of the first connecting end of the piston, and the plunger having an outer diameter less than the outer diameter of the second connecting end of the piston.

3. The recirculating pump of claim 1 wherein the piston is a hollow cylinder having two hollow sections with unequal inner diameters.

4. The recirculating pump of claim 1, further comprising two gaskets disposed on opposite sides of the first seal ring.

5. The recirculating pump of claim 1 further comprising an oil inlet port in the piston and an oil outlet port in the valve body.

6. The scavenging pump according to claim 1, wherein the first sealing ring is an X-shaped sealing ring, the second sealing ring is an O-shaped sealing ring, the elastic member and the elastic unit are springs, and the first ball and the second ball are steel balls.

7. A method of assembling a scavenge pump according to any one of claims 1 to 6, for use in an apparatus having an oil inlet passage, an oil outlet passage and a mounting groove, the method comprising:

assembling the piston member;

prepressing the assembled piston piece in the arrangement groove of the device in an interference manner to be close to one end of the oil inlet channel;

placing the elastic element into the setting groove to contact with the valve cover;

assembling the closure;

prepressing the assembled plug in the setting groove in an interference fit manner, wherein the piston element, the elastic element and the plug form the oil return pump; and

and pressing and riveting the oil return pump in the setting groove.

8. The method of claim 7, wherein preloading the plug into the mounting slot includes coupling the valve body of the plug to the piston of the piston member such that the resilient member is trapped between the plug and the piston member.

9. A hydraulic device, comprising:

a body having a mounting groove;

the scavenging pump according to any one of claims 1 to 6, disposed in the installation groove of the body; and

the hydraulic assembly is assembled on the body;

wherein the outer surface of the first seal ring and the outer surface of the second seal ring of the scavenging pump are respectively attached to the inner wall of the installation groove.

10. The hydraulic apparatus of claim 9, wherein the piston of the scavenge pump is a cylinder having a portion of its outer surface with its largest outer diameter abutting the inner wall of the mounting groove.