Plunger pump for automobile brake

Abstract

The utility model discloses a plunger pump for automobile brake. End face oil guide grooves, an annular groove and axial oil guide grooves are formed in the rear end face of the pump front body, one ends of the three end face oil guide grooves are located in the center of the rear end face of the pump front body and communicated with the end face oil guide grooves, and the other ends of the three end face oil guide grooves extend outwards in the radial direction and then are communicated with the annular groove. The six axial oil guide grooves are evenly distributed along the circumference at intervals, and the end face oil guide grooves and the axial oil guide grooves are connected and communicated through the annular grooves. The plunger pump can reduce the output oil pressure pulsation of the plunger pump, is used for improving the working efficiency of the plunger pump, prolongs the service life of the plunger pump, and reduces the oil pressure impact when the plunger pump works.

Description

Technical Field

[0001] The utility model relates to an internal component in the technical field of a product plunger pump, in particular to a pump precursor structure used in an automobile brake plunger pump. Background Art

[0002] The automobile brake adjustment plunger pump is a core component of the automobile electronic stability system (ESC). The plunger pump is widely used in the automobile brake system. It relies on the reciprocating motion of the plunger in the cylinder body to achieve oil suction and pressurization, thereby realizing the pressurization of the brake fluid stored in the accumulator back to the high-pressure circuit or pumping the liquid in the master cylinder oil cup to the wheel cylinder to achieve active pressurization, thereby realizing ABS, TCS, ACC and other functions. The working principle is: the motor drives the eccentric bearing (5) to rotate, and the eccentric bearing (5) causes the plunger assembly (3) to reciprocate along the plunger axis. The plunger pump sucks oil: when the plunger moves away from the center of the motor, the volume of the rear chamber increases, the pressure inside the rear chamber decreases, and the brake fluid enters the inner chamber through the one-way sealing ring check valve; the plunger pump pressurizes: when the plunger approaches the center of the motor, the volume of the rear chamber decreases, the pressure increases, the one-way sealing ring check valve closes, and the pressure inside the rear chamber continues to rise. When the pressure inside the rear chamber is greater than the pressure in the front, the front chamber check valve opens, and the brake fluid flows out through the front body of the pump. Its function is to pump the brake fluid generated by the decompression during ABS adjustment back to the master brake cylinder to provide power for ESC active boost.

[0003] The front body of the conventional ABS / ESC plunger pump has only one oil guide groove, and the cross-sectional area of ​​the oil guide groove does not change, which leads to large oil pressure pulsation when the plunger is working. During the operation of ESC, the oil pressure impact at the plunger pump outlet is too large, and the performance of the plunger pump is reduced. The electronic stability system (ESC) of the automobile has a loud working noise, which affects the service life of the product and causes customer complaints. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and provides a brake plunger pump for an automobile, which reduces the output oil pressure pulsation of the plunger pump, is used to improve the working efficiency of the plunger pump, increases the service life of the plunger pump, and reduces the oil pressure impact when the plunger pump is working.

[0005] The utility model is realized by the following technical solutions:

[0006] The rear end face of the pump front body is provided with three end face oil guide grooves, one annular groove and six axial oil guide grooves. One ends of the three end face oil guide grooves are located at the center of the rear end face of the pump front body and are connected together. The other ends of the three end face oil guide grooves are radially extended outward and connected to the annular groove. Six axial oil guide grooves are provided on the outer periphery of the annular groove. The six axial oil guide grooves are evenly spaced along the circumference. The annular groove connects the end face oil guide groove and the axial oil guide groove.

[0007] The total effective area of ​​all the axial oil guide grooves is larger than the opening area of ​​the one-way valve structure between the pump sleeve and the pump front body.

[0008] The pump front body is installed in the plunger pump of automobile brake. The plunger pump includes a shell and the pump front body, pump sleeve, plunger assembly, plunger and eccentric bearing in the shell; the pump sleeve is sealed and installed in the inner cavity of the plunger pump shell, and the inner cavity is divided into front and rear two coaxially interconnected cavities through the pump sleeve. The plunger pump shell corresponding to the front cavity is provided with an oil outlet, and the plunger pump shell corresponding to the rear cavity is provided with an oil inlet, and the front cavity and the rear cavity are respectively connected with the oil outlet and the oil inlet; the pump front body is installed in the front cavity, and the pump front body and the pump sleeve are connected by a one-way valve structure; the plunger assembly and the plunger are installed in the rear cavity, and the plunger is connected to the eccentric bearing after passing through the rear cavity.

[0009] The one-way valve structure comprises a spring and a valve ball. The valve ball is installed in a conical through hole opened in the center of the front end face of the pump sleeve. The valve ball is connected to a blind hole in the center of the rear end face of the pump front body through the spring.

[0010] The plunger assembly comprises a one-way valve spring, a steel ball, a one-way valve sleeve, a one-way sealing ring and a plunger. The rear end of the one-way sealing ring is connected to the plunger. The one-way sealing ring is sleeved in an inner cavity opened at the rear end of the pump sleeve and is sealed and connected to the pump sleeve. A center hole is opened in the one-way sealing ring. The rear end of the center hole of the one-way sealing ring is connected to the liquid inlet via a channel inside the one-way sealing ring. The front end of the one-way sealing ring is connected to the rear end of the one-way valve sleeve. The front end of the one-way valve sleeve is elastically connected to the inner end face of the pump sleeve via a large spring. A one-way valve spring and a steel ball are installed in the one-way valve sleeve. Both ends of the one-way valve spring are respectively connected to the surface inside the rear end of the one-way valve sleeve and the steel ball. The steel ball is in close contact with the front hole end face of the center hole of the one-way sealing ring.

[0011] The one-way valve sleeve is provided with a through hole coaxial with the center hole of the one-way sealing ring at a supporting surface connected with the one-way valve spring.

[0012] The beneficial effects of the utility model are:

[0013] The utility model designs a brake plunger pump for automobiles: the pump front body is provided with two-stage oil guide grooves to reduce the output oil pressure pulsation of the plunger pump, thereby improving the performance and service life of the plunger pump and reducing the working noise of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the pump front body of the utility model;

[0015] Figure 2 It is a cross-sectional view of the pump front body of the utility model;

[0016] Figure 3 It is a cross-sectional view of the plunger pump of the utility model;

[0017] Figure 4 It is a state diagram of the plunger assembly of the utility model.

[0018] In the figure: a pump front body (1), a pump sleeve (2), a plunger assembly (3), a plunger (4), an eccentric bearing (5); an end surface oil guide groove (11), an annular groove (12), an axial oil guide groove (13); a one-way valve spring (31), a steel ball (32), a one-way valve sleeve (33), and a one-way sealing ring (34). DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is described below in conjunction with the accompanying drawings.

[0020] like Figure 1 and Figure 2 As shown, the rear end face of the pump front body 1 is provided with three end face oil guide grooves 11, one annular groove 12 and six axial oil guide grooves 13, one end of the three end face oil guide grooves 11 are all located at the center of the rear end face of the pump front body 1 and are connected together, the other ends of the three end face oil guide grooves 11 are all extended radially outward and connected with the annular groove 12, the outer periphery of the annular groove 12 is provided with six axial oil guide grooves 13, the six axial oil guide grooves 13 are evenly spaced along the circumference, wherein the three axial oil guide grooves 13 are located in the same radial direction respectively for the three end face oil guide grooves 11, and the annular groove 12 connects and communicates the end face oil guide grooves 11 and the axial oil guide grooves 13. The oil first enters the three end face oil guide grooves 11 of the pump front body 1, and then enters the six axial oil guide grooves 13 through the annular groove 12.

[0021] The total effective area of ​​all axial oil guide grooves 13 is larger than the opening area of ​​the one-way valve structure between the pump sleeve 2 and the pump front body 1, which can reduce the oil pressure pulsation during the operation of the plunger pump and reduce the working noise of the plunger.

[0022] The pump precursor 1 is installed in a plunger pump for automobile brakes, such as Figure 3 As shown, the plunger pump includes a housing and a pump front body 1, a pump sleeve 2, a plunger assembly 3, a plunger 4 and an eccentric bearing 5 in the housing; the pump sleeve 2 is sealed in the inner cavity of the plunger pump housing, and the inner cavity is divided into two coaxially interconnected front and rear cavities through the pump sleeve 2. The plunger pump housing corresponding to the front cavity is provided with an oil outlet, and the plunger pump housing corresponding to the rear cavity is provided with an oil inlet. The front cavity and the rear cavity are connected to the oil outlet and the oil inlet respectively; the pump front body 1 is installed in the front cavity, and the pump front body 1 and the pump sleeve 2 are connected through a one-way valve structure; the plunger assembly 3 and the plunger 4 are installed in the rear cavity, and the plunger 4 passes through the rear cavity and is connected to the external eccentric bearing 5. An oil filter is arranged between the inner wall of the rear cavity and the oil inlet.

[0023] The high-pressure oil first enters the pump sleeve 2 from the liquid inlet, passes through the plunger assembly 3, and then enters the front chamber after passing through the one-way valve structure between the pump sleeve 2 and the pump front body 1. The oil in the front chamber first enters the three end surface oil guide grooves 11 of the pump front body 1, and the liquid then passes through the annular groove 12 and enters the six axial oil guide grooves 13.

[0024] The one-way valve structure includes a spring and a valve ball. The valve ball is installed in a conical through hole opened in the center of the front end face of the pump sleeve 2. The valve ball is connected to a blind hole in the center of the rear end face of the pump front body 1 through the spring.

[0025] like Figure 4 As shown, the plunger assembly 3 includes a one-way valve spring 31, a steel ball 32, a one-way valve sleeve 33, a one-way sealing ring 34 and a plunger 4, the rear end of the one-way sealing ring 34 is connected to the plunger 4, the one-way sealing ring 34 is sleeved in the inner cavity opened at the rear end of the pump sleeve 2 and is sealed and connected to the pump sleeve 2; a center hole that axially penetrates front and back is opened in the one-way sealing ring 34, the rear end of the center hole of the one-way sealing ring 34 is connected to the liquid inlet through the channel inside the one-way sealing ring 34, and the front end penetrates through the one-way sealing ring 34; the front end of the one-way sealing ring 34 is clamped and connected to the rear end of the one-way valve sleeve 33, the front end of the one-way valve sleeve 33 is elastically connected to the inner end face of the pump sleeve 2 through the large spring, the one-way valve spring 31 and the steel ball 32 are installed in the rear end of the one-way valve sleeve 33, the two ends of the one-way valve spring 31 are respectively connected to the surface inside the rear end of the one-way valve sleeve 33 and the steel ball 32, and the steel ball 32 is in close contact with the front hole end face of the center hole of the one-way sealing ring 34.

[0026] In specific implementation, the steel ball 32 and the one-way sealing ring 34 form a one-way valve, the one-way valve sleeve 33 provides support for the one-way valve spring 31, and the one-way valve spring 31 provides pressure to seal the valve port of the one-way valve for the steel ball 32. The one-way valve sleeve 33 provides support for the one-way valve spring 31, and the plunger 4 and the one-way sealing ring 34 are interference connected.

[0027] The one-way valve sleeve 33 is provided with a through hole coaxial with the center hole of the one-way sealing ring 34 at the supporting surface connected to the one-way valve spring 31. When the plunger pump starts to pressurize, high-pressure liquid flows through the through hole to pressurize the steel ball 32, so that the plunger one-way valve is quickly closed, thereby improving the efficiency of the plunger pump and improving the working efficiency of the plunger pump.

[0028] In the specific implementation, the oil enters the rear oil inlet, enters the rear cavity after being filtered by the oil filter, and then enters the center hole of the one-way sealing ring 34, and then the steel ball 32 is pushed by the oil pressure to open the one-way valve in the plunger assembly 3, so that the oil enters the one-way valve sleeve 33, and then enters the inner cavity opened at the rear end of the pump sleeve 2 through the through hole of the one-way valve sleeve 33, and finally enters the front cavity through the tapered through hole in the center of the front end face of the pump sleeve 2.

[0029] In the specific implementation, the one-way seal ring 34 is integrally formed by one-step injection molding and is made of self-lubricating polymer material. The self-lubricating polymer material reduces the resistance between the one-way seal ring 4 and the pump sleeve 2 when the plunger pump is working, thereby improving the working efficiency and service life of the plunger pump.

[0030] The one-way sealing ring 34 of the utility model is made of self-lubricating polymer material, which has a lower friction coefficient and better wear resistance than the existing rubber material, and can also improve the performance and service life of the plunger pump and reduce the working noise of the plunger pump.

[0031] The working process of the utility model is as follows:

[0032] When the plunger pump is pressurized, the one-way seal ring 34 and the steel ball 32 cooperate to form a one-way valve. The one-way seal ring 34 has a sealing lip and a line contact interference fit with the inner surface of the pump sleeve 32. The outer surface of the one-way seal ring 34 and the inner surface of the pump sleeve 2 have a clearance fit, which reduces the friction between the plunger seal ring 34 and the inner surface of the pump sleeve 32, so that the plunger pump can absorb oil faster. The plunger one-way seal ring 34 is made of self-lubricating polymer material. Compared with rubber seal material, lubricating polymer material has the characteristics of low friction coefficient and good wear resistance, which increases the service life and reduces the working noise. The three end surface oil guide grooves 11 of the pump front body, and the liquid passes through the annular groove 12 and enters the six axial oil guide grooves 13. The effective area of ​​the oil guide groove is larger than the opening area of ​​the one-way valve, which reduces the oil pressure pulsation during the plunger pump process and reduces the working noise of the plunger.

[0033] It can be seen from this implementation that the pump front body of the utility model can be used to improve the performance of the high-pressure piston pump and reduce the working noise of the piston pump, which can help improve the smoothness of the ESC operation and reduce the ESC working noise.

[0034] The above is an embodiment of the present invention. The present invention is not limited to the above embodiments, and anyone should be aware that any structural changes made under the enlightenment of the present invention, and any technical solutions that are the same or similar to the present invention, fall within the protection scope of the present invention.

Claims

1. A brake plunger pump for an automobile, characterized in that: The rear end surface of the pump front body (1) is provided with three end surface oil guide grooves (11), one annular groove (12) and six axial oil guide grooves (13); one end of the three end surface oil guide grooves (11) is located at the center of the rear end surface of the pump front body (1) and is connected together; the other ends of the three end surface oil guide grooves (11) extend radially outward and are connected to the annular groove (12); six axial oil guide grooves (13) are provided on the outer periphery of the annular groove (12); the six axial oil guide grooves (13) are evenly spaced along the circumference; the annular groove (12) connects and communicates the end surface oil guide grooves (11) and the axial oil guide grooves (13).

2. The brake plunger pump for automobile according to claim 1, characterized in that: The total effective area of ​​all the axial oil guide grooves (13) is larger than the opening area of ​​the one-way valve structure between the pump sleeve (2) and the pump front body (1).

3. The brake plunger pump for automobile according to claim 1, characterized in that: The pump front body (1) is installed in a plunger pump for automobile brakes. The plunger pump comprises a housing and the pump front body (1), a pump sleeve (2), a plunger assembly (3), a plunger (4) and an eccentric bearing (5) in the housing. The pump sleeve (2) is sealed in the inner cavity of the plunger pump housing. The inner cavity is divided into two coaxially interconnected front and rear cavities by the pump sleeve (2). The plunger pump housing corresponding to the front cavity is provided with an oil outlet. The plunger pump housing corresponding to the rear cavity is provided with an oil inlet. The front cavity and the rear cavity are respectively connected to the oil outlet and the oil inlet. The pump front body (1) is installed in the front cavity. The pump front body (1) and the pump sleeve (2) are connected via a one-way valve structure. The plunger assembly (3) and the plunger (4) are installed in the rear cavity. The plunger (4) passes through the rear cavity and is connected to the eccentric bearing (5).

4. The brake plunger pump for automobile according to claim 3, characterized in that: The one-way valve structure comprises a spring and a valve ball. The valve ball is installed in a conical through hole opened in the center of the front end face of the pump sleeve (2). The valve ball is connected to a blind hole in the center of the rear end face of the pump front body (1) via the spring.

5. The brake plunger pump for automobile according to claim 3, characterized in that: The plunger assembly (3) comprises a one-way valve spring (31), a steel ball (32), a one-way valve sleeve (33), a one-way sealing ring (34) and a plunger (4); the rear end of the one-way sealing ring (34) is connected to the plunger (4); the one-way sealing ring (34) is sleeved in an inner cavity opened at the rear end of the pump sleeve (2) and is sealed and connected to the pump sleeve (2); a center hole is opened in the one-way sealing ring (34); the rear end of the center hole of the one-way sealing ring (34) is connected to the inner channel and the inlet of the one-way sealing ring (34). The front end of the one-way sealing ring (34) is connected to the rear end of the one-way valve sleeve (33), the front end of the one-way valve sleeve (33) is elastically connected to the inner end surface of the pump sleeve (2) via a large spring, a one-way valve spring (31) and a steel ball (32) are installed in the one-way valve sleeve (33), the two ends of the one-way valve spring (31) are respectively connected to the surface inside the rear end of the one-way valve sleeve (33) and the steel ball (32), and the steel ball (32) is in close contact with the front hole end surface of the center hole of the one-way sealing ring (34).

6. The brake plunger pump for automobile according to claim 5, characterized in that: The one-way valve sleeve (33) is provided with a through hole coaxial with the center hole of the one-way sealing ring (34) at a supporting surface connected to the one-way valve spring (31).

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