A plunger-type booster brake pump equipped with a one-way valve

Abstract

A plunger-type booster brake pump equipped with a one-way valve includes a housing assembly and a plunger assembly. The plunger assembly includes a plunger, a plunger sleeve, and a cup. One end of the plunger sleeve is movably disposed within the inner cavity of the housing assembly, forming a first volume chamber between the plunger sleeve and the inner cavity of the housing assembly. The cup divides the inner cavity of the housing assembly into a second volume chamber and a third volume chamber. A plunger cavity is provided at one end of the plunger adjacent to the plunger sleeve. The plunger cavity has first through holes evenly distributed around its axis that communicate with the second volume chamber, and a one-way valve is provided at the end adjacent to the first volume chamber. During operation, the plunger-type booster brake pump shortens the stroke and increases braking force by controlling the connection and disconnection between the first and second volume chambers through the one-way valve. At the same time, it avoids the pressure drop in the first volume chamber caused by the connection between the first and third volume chambers, solving the problem of the downward bending inflection point in the pedaling force curve and ensuring the braking safety of tractors or large motor vehicles.

Description

Technical Field

[0001] This utility model relates to the technical field of power-assisted brake pumps for agricultural machinery or other motor vehicles, specifically to a plunger-type booster brake pump equipped with a one-way valve. Background Technology

[0002] Utility model patent application number 202322013980.6 discloses a plunger-type booster brake pump structure, including a housing and a plunger assembly. The plunger assembly is installed in a cavity within the housing. The plunger assembly includes a plunger and a core, with the core axially installed within the plunger. During braking, the plunger-type booster brake pump operates in three stages: First stage: The piston cup 6 passes the second channel 1.8, sealing and compressing the first volume chamber 1.4, the second volume chamber 1.5, and the fourth volume chamber 2.6. Due to a certain idle stroke in the brake cylinder, this stage involves rapid advancement at low pressure, eliminating the brake cylinder clearance. Second stage: After the brake cylinder clearance is eliminated, the plunger 2.1 continues to be pushed, gradually increasing the oil pressure in the first volume chamber 1.4, the second volume chamber 1.5, and the fourth volume chamber 2.6. Oil enters the brake cylinder from the outlet 1.1, forming low-pressure braking. Third stage: The first volume chamber 1.4, the second volume chamber 1.5... When the oil pressure in the fourth volume chamber 2.6 reaches the force set by the pressure regulating screw 2.5 and the pressure limiting spring 2.3, the piston core 2.2 is pushed towards the fifth volume chamber 2.7, the first volume chamber 1.4 is closed, and the second volume chamber 1.5, the third volume chamber 1.6, the fourth volume chamber 2.6, and the fifth volume chamber 2.7 are connected. At this time, if the pedal force is increased further, the plunger 2.1 is pushed forward, and the brake fluid in the first volume chamber 1.4 continues to be squeezed, forming high pressure to push the brake cylinder. Because the area of ​​the plunger 2.1 is small when high pressure is formed, the operator can use a small pedal force to generate a large braking force.

[0003] However, during actual use of the aforementioned plunger-type booster brake pump, a problem was found: when the plunger moves to the second stage, the brake cylinder has already begun to form low-pressure braking; when the plunger moves to the third stage, and the oil pressure in the first volume chamber 1.4, the second volume chamber 1.5, and the fourth volume chamber 2.6 reaches the force set by the pressure regulating screw 2.5 and the pressure limiting spring 2.3 (at this time, the driver clearly feels the increase in pedal force, but the braking force has not yet reached its maximum), during the process of the plunger core 2.2 being pushed towards the fifth volume chamber 2.7, there will be a brief momentary connection between the first volume chamber 1.4 and the second volume chamber 1.5, and the third volume chamber 1.6 (the third volume chamber 1.6 is always at low pressure). When the second and third volumes 1.5 are momentarily connected, the hydraulic oil pressure in the first volume 1.4 will momentarily drop (at this time, the driver will clearly feel a decrease in pedal force), causing the hydraulic oil in the brake cylinder to also momentarily drop, resulting in a decrease in braking force. Subsequently, as the piston core 2.2 moves into place towards the fifth volume 2.7, the connection between the first volume 1.4 and the second and third volumes 1.6 is completely closed, and the hydraulic oil pressure in the first volume 1.4 will quickly rise again (at this time, the driver will clearly feel a resurgence in pedal force). Therefore, during the entire braking process, the pedal force curve and the braking force curve are not a continuously rising curve, but rather have a downward bending inflection point.

[0004] The problem of the downward bending inflection point in the aforementioned pedal force and braking force curves has the following consequences: When a driver brakes a tractor or other large vehicle, and encounters the inflection point while pressing the brake pedal, because the maximum braking force has not yet been achieved, the driver will continue to increase the pressure on the brake pedal. However, the pedal force drops rapidly after encountering the inflection point and then rises rapidly again, often leaving the driver with no time to react. This results in the driver actually experiencing sudden braking due to excessive pressure on the brake pedal, even when they do not intend to brake suddenly. Therefore, it seriously affects the braking safety of tractors or other large motor vehicles. Utility Model Content

[0005] In order to overcome the shortcomings in the prior art, this utility model discloses a plunger-type booster brake pump with a one-way valve to solve the problem that the pedal force curve of the existing plunger-type booster brake pump has a downward bending inflection point, thereby ensuring the braking safety of tractors or other large motor vehicles.

[0006] To achieve the aforementioned objective, this utility model adopts the following technical solution: A plunger-type booster brake pump equipped with a one-way valve includes a housing assembly and a plunger assembly. The housing assembly is provided with an oil inlet, a first channel, a second channel, and an oil outlet. The oil inlet communicates with the inner cavity of the housing through the first channel and the second channel, and the oil outlet directly communicates with the inner cavity of the housing. The plunger assembly includes a plunger and a plunger sleeve disposed at one end of the plunger. A piston cup is disposed on the plunger assembly. The end of the plunger assembly with the plunger sleeve is movably disposed within the inner cavity of the housing assembly. The inner cavities of the housing assembly form a first volumetric cavity, which is connected to the oil outlet. The piston cup divides the inner cavities of the housing assembly into a second and a third volumetric cavity. In the initial state, the second volumetric cavity is connected to the oil inlet through a second channel, and the third volumetric cavity is connected to the oil inlet through a first channel. One end of the plunger adjacent to the plunger sleeve is provided with a plunger cavity, and the plunger cavity is provided with first through holes evenly distributed around its axis. The second volumetric cavity is connected to the plunger cavity through the first through holes. One-way valve is provided at one end of the plunger cavity adjacent to the plunger sleeve. The one-way valve controls the connection and disconnection between the first volumetric cavity and the plunger cavity.

[0007] Furthermore, the plunger cavity is also provided with several damping holes evenly distributed around its axis, and the second volume cavity and the third volume cavity are connected through the first through hole, the plunger cavity, and the damping holes.

[0008] Furthermore, the housing assembly includes a housing, an oil outlet cap, a plunger sealing ring, and a sealing ring retaining ring. The oil outlet cap is fixedly disposed at one end of the housing, and the plunger sealing ring and the sealing ring retaining ring are fixedly disposed at the other end of the housing. The housing is provided with an oil inlet, a first channel, and a second channel. The oil inlet communicates with the inner cavity of the housing through the first channel and the second channel. The oil outlet cap is provided with an oil outlet at the end away from the housing.

[0009] Furthermore, the leather cup is located inside the housing cavity; the plunger sleeve is located inside the housing and the oil outlet end cap cavity.

[0010] Furthermore, a pressure balance ring is provided at the end of the oil outlet cap adjacent to the housing, and several pressure balance holes are evenly distributed around the axis on the plunger sleeve; in the initial state, the pressure balance holes are located at the pressure balance ring, and the first volume chamber is connected to the second volume chamber through the pressure balance holes.

[0011] Furthermore, a plunger assembly return spring is provided between the plunger assembly and the housing assembly.

[0012] Furthermore, a one-way valve reset spring retaining ring is fixedly installed at the outer end of the plunger cavity, and a one-way valve reset spring is installed between the one-way valve and the one-way valve reset spring retaining ring.

[0013] Due to the adoption of the above-described technical solution, this utility model has the following beneficial effects: This utility model discloses a plunger-type booster brake pump with a one-way valve, comprising a housing assembly and a plunger assembly. The plunger assembly includes a plunger and a plunger sleeve fixedly disposed at one end of the plunger. A piston cup is provided on the plunger assembly. The end of the plunger assembly with the plunger sleeve is movably disposed within the inner cavity of the housing assembly, forming a first volumetric cavity between the plunger sleeve and the inner cavity of the housing assembly. The piston cup divides the inner cavity of the housing assembly into a second volumetric cavity and a third volumetric cavity. A plunger cavity is provided at one end of the plunger adjacent to the plunger sleeve, and the plunger cavity is oriented around its axis... A first through hole is provided, and the second volume chamber is connected to the plunger chamber through the first through hole; a one-way valve is movably provided at one end of the plunger sleeve adjacent to the plunger chamber; during the operation of this plunger-type booster brake pump, the one-way valve controls the connection and disconnection between the first volume chamber and the second volume chamber, thereby shortening the stroke and increasing the braking force, while avoiding the pressure drop in the first volume chamber caused by the instantaneous connection between the first volume chamber and the third volume chamber. This solves the problem of the downward bending inflection point of the pedal force curve during the operation of the plunger-type booster brake pump, thus ensuring the braking safety of tractors or other large motor vehicles. Attached Figure Description

[0014] Figure 1 A schematic diagram of the cross-sectional structure of an existing plunger-type booster brake pump;

[0015] Figure 2 A schematic diagram showing the pedal force and braking force curves when an existing plunger-type booster brake pump is in operation;

[0016] Figure 3 A schematic cross-sectional view of a plunger-type booster brake pump equipped with a check valve.

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the shell assembly;

[0018] Figure 5 This is a schematic diagram of the cross-sectional structure of the plunger assembly;

[0019] Figure 6 A schematic diagram of the working process of a plunger-type booster brake pump equipped with a one-way valve. Figure 1 ;

[0020] Figure 7 A schematic diagram of the working process of a plunger-type booster brake pump equipped with a one-way valve. Figure 2 ;

[0021] Figure 8 A schematic diagram showing the pedaling force and braking force curves when a plunger-type booster brake pump equipped with a one-way valve is in operation.

[0022] In the diagram: 1. Housing assembly; 1.1 Housing; 1.2 Oil outlet cap; 1.2.1 Oil outlet; 1.2.2 Pressure balance ring; 1.3 Oil inlet; 1.4 First volumetric cavity; 1.5 Second volumetric cavity; 1.6 Third volumetric cavity; 1.7 First channel; 1.8 Second channel; 1.2.1 Oil outlet; 2. Plunger assembly; 2.1 Plunger; 2.1.1 Plunger cavity; 2.1.2 Damping orifice; 2.2... 2.3. Pressure limiting spring; 2.4. Plunger assembly return spring; 2.5. Pressure adjusting screw plug; 2.6. Fourth volume chamber; 2.7. Fifth volume chamber; 2.8. First through hole; 2.9. Second through hole; 2.11. Plunger sleeve; 2.11.1. Pressure balance hole; 2.12. Check valve; 2.13. Check valve return spring; 2.14. Check valve return spring retaining ring; 3. Plunger sealing ring; 4. Sealing ring fixing ring; 6. Leather cup. Detailed Implementation

[0023] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0024] See the instruction manual appendix Figure 1 :

[0025] Instruction manual attached Figure 1 The diagram shows a cross-sectional structure of the plunger-type booster brake pump described in the background section. This plunger-type booster brake pump includes a housing assembly 1 and a plunger assembly 2. The housing assembly 1 includes a housing 1.1 and an oil outlet cap 1.2 fixedly disposed at the right end. The housing 1.1 has an oil inlet 1.3, a first channel 1.7, and a second channel 1.8. The oil outlet cap 1.2 has an oil outlet 1.2.1. The oil inlet 1.3 communicates with the inner cavity of the housing 1.1 through the first channel 1.7 and the second channel 1.8, and the oil outlet 1.2.1 directly communicates with the inner cavity of the oil outlet cap 1.2. The plunger assembly 2 includes a plunger 2.1 and a plunger sleeve 2 fixedly disposed at the right end of the plunger 2.1. 11. A cup 6 is provided on the outer circular surface of the plunger assembly 2; one end of the plunger assembly 2 with a plunger sleeve 2.11 is movably disposed in the inner cavity of the housing assembly 1, and a first volume chamber 1.4 is formed between the plunger sleeve 2.11 and the inner cavity of the oil outlet cap 1.2. The first volume chamber 1.4 is connected to the oil outlet 1.2.1. A plunger assembly return spring 2.4 is provided in the first volume chamber 1.4; the cup 6 divides the inner cavity of the housing 1.1 into a second volume chamber 1.5 and a third volume chamber 1.6. In the initial state, the second volume chamber 1.5 is connected to the oil inlet 1.3 through the second channel 1.8, and the third volume chamber 1.6 is connected to the oil inlet 1.3 through the first channel 1.7.

[0026] The plunger assembly 2 contains a movable core 2.2. A pressure-limiting spring 2.3 and a pressure-adjusting screw 2.5 are located at the left end of the core 2.2. The pressure-adjusting screw 2.5 adjusts the preload of the pressure-limiting spring 2.3. A fourth volume chamber 2.6 is formed by the gap between the outer surface of the core 2.2 and the plunger 2.1. The end of the core 2.2 furthest from the first volume chamber 1.4, together with the plunger 2.1, forms a fifth volume chamber 2.7. The fourth volume chamber 2.6 communicates with the second volume chamber 1.5 through the first through hole 2.8 of the plunger assembly 2, and the fifth volume chamber 2.7 communicates with the third volume chamber 1.6 through the second through hole 2.9 of the plunger assembly 2. In the initial state, the core 2.2, under the action of the pressure-limiting spring 2.3, connects the fourth volume chamber 2.6 with the first volume chamber 1.4.

[0027] During braking, the foot pedal pushes the plunger 2.1 to move. In the first stage, the piston cup 6 passes the second channel 1.8, and the first volume chamber 1.4, the second volume chamber 1.5, and the fourth volume chamber 2.6 are sealed and compressed. Due to the brake cylinder having a certain free stroke, this stage involves rapid advancement at low pressure to eliminate the brake cylinder clearance. In the second stage, after the brake cylinder clearance is eliminated, the plunger 2.1 continues to be pushed, and the oil pressure in the first volume chamber 1.4, the second volume chamber 1.5, and the fourth volume chamber 2.6 gradually increases, and hydraulic oil flows out from the outlet... Oil port 1.1 enters the brake cylinder, forming low-pressure braking; Third stage: When the oil pressure in the first volume chamber 1.4, the second volume chamber 1.5, and the fourth volume chamber 2.6 reaches the force set by the pressure regulating screw 2.5 and the pressure limiting spring 2.3, the plug core 2.2 is pushed towards the fifth volume chamber 2.7. During this process, there will be a momentary connection between the first volume chamber 1.4 and the second volume chamber 1.5, and the third volume chamber 1.6 through the connecting fourth volume chamber 2.6 and the fifth volume chamber 2.7. Because the third volume chamber 1... 1.6 is always connected to the oil inlet 1.3, and the third volume chamber 1.6 is always kept at low pressure. When the first volume chamber 1.4 is momentarily connected to the second volume chamber 1.5 and the third volume chamber 1.6, the hydraulic oil pressure in the first volume chamber 1.4 will momentarily drop (at this time, the driver will clearly feel a decrease in pedal force), causing the hydraulic oil in the brake cylinder to also momentarily drop, resulting in a decrease in braking force. Subsequently, as the piston core 2.2 moves into place towards the fifth volume chamber 2.7, the first volume chamber 1.4 is closed. At this time, if the pedal force is further increased to push the plunger 2.1, the brake fluid in the first volume chamber 1.4 will continue to be squeezed, and the hydraulic oil pressure in the first volume chamber 1.4 will quickly rise again (at this time, the driver will clearly feel a renewed increase in pedal force), forming high pressure to push the brake cylinder. Therefore, during the entire braking process, the pedal force curve and the braking force curve are not a continuous rising curve, but rather have a downward bending inflection point. For details on the pedal force and braking force curves of the existing plunger-type booster brake pump, please refer to the instruction manual appendix. Figure 2 ;

[0028] The consequences of the downward bending inflection point in the aforementioned pedal force and braking force curves are as follows: When a driver brakes a tractor or other large vehicle and encounters the inflection point while pressing the brake pedal, the braking force has not yet reached its maximum. The driver will continue to increase the pressure on the brake pedal, but the pedal force drops rapidly after encountering the inflection point and then rises rapidly again, often leaving the driver with no time to react. This results in the driver actually having to brake suddenly due to excessive pressure on the brake pedal, even when they do not intend to brake suddenly. Therefore, this seriously affects the braking safety of tractors or other large motor vehicles.

[0029] See the instruction manual appendix Figure 3 The cross-sectional structure of the plunger-type booster brake pump with a one-way valve of the present invention is shown, including housing assembly 1 and plunger assembly 2.

[0030] See the instruction manual appendix Figure 4 The housing assembly 1 includes a housing 1.1 and an oil outlet cap 1.2. The oil outlet cap 1.2 is located at the right end of the housing 1.1 and is fixedly connected by welding (the housing 1.1 and the oil outlet cap 1.2 can also be designed as an integral structure, but usually a split structure design is adopted for ease of processing). The housing 1.1 is provided with an oil inlet 1.3, a first channel 1.7, and a second channel 1.8. The oil inlet 1.3 communicates with the inner cavity of the housing 1.1 through the first channel 1.7 and the second channel 1.8. The right end of the oil outlet cap 1.2 is provided with an oil outlet 1.2.1, which communicates directly with the inner cavity of the oil outlet cap 1.2. A pressure balance ring 1.2.2 is provided on the inner circular surface of the oil outlet cap 1.2 adjacent to the housing 1.1. A plunger sealing ring 3 is provided at the left end of the housing 1.1, and the plunger sealing ring 3 is fixedly connected to the housing 1.1 through a sealing ring fixing ring 4.

[0031] See the instruction manual appendix Figure 5The plunger assembly 2 includes a plunger 2.1 and a plunger sleeve 2.11 located at the right end of the plunger 2.1 (the plunger 2.1 and the plunger sleeve 2.11 can be two separate structures or an integral structure; usually, for ease of processing, the plunger 2.1 and the plunger sleeve 2.11 are two separate structures). A cup 6 is provided on the plunger 2.1. One end of the plunger 2.1 adjacent to the plunger sleeve 2.11 is provided with a plunger cavity 2.1.1. The plunger cavity 2.1.1 is provided with four first through holes 2.8 and four damping holes 2.1.2 evenly distributed around its axis. A one-way valve is movably provided at the side port of the plunger cavity 2.1.1 adjacent to the plunger sleeve 2.11. Valve 2.12, check valve return spring 2.13, and check valve return spring retaining ring 2.14. In the initial state, under the action of check valve return spring 2.13, the plunger cavity 2.1.1 and the inner cavity of plunger sleeve 2.11 of check valve 2.12 are in a closed state. In this embodiment, check valve 2.12 adopts a short stepped shaft, and the one-way valve is closed and opened by the cooperation between the conical surface of the short stepped shaft and the conical surface in plunger cavity 2.1.1. Preferably, check valve 2.12 can be replaced by a steel ball. In addition, four pressure balance holes 2.11.1 are evenly distributed around the axis at the end of plunger sleeve 2.11 away from plunger 2.1.

[0032] See the instruction manual appendix Figure 3 The plunger assembly 2 has a plunger sleeve 2.11, one end of which is movably disposed within the inner cavity of the housing assembly 1. The plunger sleeve 2.11 and the inner cavity of the oil outlet cap 1.2 form a first volumetric cavity 1.4, which communicates with the oil outlet 1.2.1. The cup 6 divides the inner cavity of the housing 1.1 into a second volumetric cavity 1.5 and a third volumetric cavity 1.6. Initially, the second volumetric cavity 1.5 is connected to the oil inlet 1.3 via a second channel 1.8, and the third volumetric cavity 1.6 is connected to the oil inlet 1.3 via a first channel 1.7. The second volumetric cavity 1... 1.5 is connected to the plunger cavity 2.1.1 through the first through hole 2.8, and the third volume cavity 1.6 is connected to the plunger cavity 2.1.1 through the damping hole 2.1.2. That is, the second volume cavity 1.5 and the third volume cavity 1.6 are always connected through the first through hole 2.8, the plunger cavity 2.1.1, and the damping hole 2.1.2 during the initial stage and the working process. The pressure balance hole 2.11.1 is located at the pressure balance ring 1.2.2 in the initial state, and the first volume cavity 1.4 is connected to the second volume cavity 1.5 through the pressure balance hole 2.11.1.

[0033] The braking process of a plunger-type booster brake pump equipped with a one-way valve is as follows:

[0034] When braking, the driver presses the foot pedal, which pushes the plunger assembly 2 to the right;

[0035] First stage: Elimination of brake cylinder clearance: See the instruction manual appendix. Figure 6Initially, the one-way valve 2.12 is closed; the piston cup 6 crosses the second channel 1.8, the volume of the third volume chamber 1.6 expands, and the oil inlet 1.3 replenishes oil into the third volume chamber 1.6 through the first channel 1.7, maintaining a constant pressure within the third volume chamber 1.6; the first volume chamber 1.4 and the second volume chamber 1.5 are sealed and compressed, and the first volume chamber 1.4 supplies oil to the brake cylinder through the oil outlet 1.2.1. Due to the brake cylinder having a certain free stroke, the pressure rise in the first volume chamber 1.4 is small at this time, and a small amount of hydraulic oil in the second volume chamber 1.5 passes through... The hydraulic oil flows from the first through hole 2.8, the plunger chamber 2.1.1, and the damping hole 2.1.2 to the third volume chamber 1.6. Due to the damping effect of the damping hole 2.1.2, the hydraulic oil pressure in the second volume chamber 1.5 rises rapidly, exceeding the pressure in the first volume chamber 1.4. At this time, the one-way valve 2.12 opens, and a large amount of hydraulic oil in the second volume chamber 1.5 enters the first volume chamber 1.4 through the first through hole 2.8, the plunger chamber 2.1.1, and the opened one-way valve 2.12, thereby shortening the stroke of the plunger assembly 2 (foot pedal stroke) and quickly eliminating the brake cylinder clearance.

[0036] The second stage involves applying braking force using the hydraulic cylinder: see the instruction manual appendix. Figure 7 After the brake cylinder clearance is eliminated, the plunger assembly 2 continues to move to the right, and the pressure in the first volume chamber 1.4 begins to rise until it exceeds the pressure in the second volume chamber 1.5, at which point the one-way valve 2.12 closes. At this time, since the second volume chamber 1.5 and the third volume chamber 1.6 are connected, they do not create resistance to the rightward movement of the plunger assembly 2 (at this time, the displacement and speed of the plunger assembly 2 are small, and the damping effect of the damping orifice 2.1.2 is negligible). Therefore, the thrust of the foot pedal on the plunger assembly 2 is almost entirely applied to the plunger sleeve 2.11. Due to the small projected area of ​​the plunger sleeve 2.11, the thrust of the foot pedal on the plunger assembly 2 will generate greater pressure in the first volume chamber 1.4, amplifying the braking force. At the same time, the pressure in the first volume chamber 1.4 will also be fed back to the foot pedal through the plunger sleeve 2.11, allowing the driver to directly feel the magnitude of the braking force, thus enabling the driver to accurately control the braking force by feeling the magnitude of the feedback force from the foot pedal.

[0037] Throughout the entire braking process described above, the plunger-type booster brake pump equipped with a one-way valve only has two stages: the brake cylinder clearance elimination stage and the brake cylinder loading braking stage. Throughout the entire braking process, the driver's pedal pressure and braking force continuously increase. (See the instruction manual appendix.) Figure 8This eliminates the problem of the pedal force and braking force dropping and then rising instantaneously, thus eliminating the downward bending inflection point problem of the pedal force curve during the operation of the plunger-type booster brake pump in the background technology. In addition, the braking force during cylinder loading braking will be fed back to the foot pedal, so that the driver can accurately control the braking force by the magnitude of the feedback force from the foot pedal, thereby ensuring the braking safety of tractors or other large motor vehicles.

[0038] After braking, the force exerted by the foot pedal on the plunger assembly 2 disappears, and the high-pressure oil in the brake cylinder flows back to the first volume chamber 1.4, pushing the plunger assembly 2 to the left. The volume of the second volume chamber 1.5 increases, and the pressure in the second volume chamber 1.5 is less than the pressure in the first volume chamber 1.4. The one-way valve 2.12 closes, and the hydraulic oil in the third volume chamber 1.6 replenishes the second volume chamber 1.5 through the damping hole 2.1.2, the plunger chamber 2.1.1, and the first through hole 2.8 until the plunger assembly 2 returns to its initial position. After the plunger assembly 2 returns to its initial position, the pressure balance hole 2.11.1 is located at the pressure balance ring 1.2.2, and the first volume chamber 1.4 is connected to the second volume chamber 1.5 through the pressure balance hole 2.11.1, thereby eliminating the residual pressure in the first volume chamber 1.4 and preventing the brake pads from failing to completely separate due to residual pressure in the brake cylinder.

[0039] Preferably, in order to ensure that the plunger assembly 2 can be completely and reliably reset after braking, a plunger assembly reset spring 2.4 is also provided between the plunger 2.1 and the oil outlet cap 1.2.

[0040] The plunger-type booster brake pump of this utility model with a one-way valve has fewer parts compared to the plunger-type booster brake pump in the prior art, and the adjustment process of the pressure limiting spring 2.3 is eliminated in the production process, thus reducing the production cost.

[0041] The parts of this utility model not described in detail are existing technologies.

Claims

1. A plunger-type booster brake pump equipped with a one-way valve, comprising a housing assembly (1) and a plunger assembly (2). The housing assembly (1) is provided with an oil inlet (1.3), a first channel (1.7), a second channel (1.8), and an oil outlet (1.2.1) on the housing (1.1). The oil inlet (1.3) communicates with the inner cavity of the housing (1.1) through the first channel (1.7) and the second channel (1.8), and the oil outlet (1.2.1) communicates directly with the inner cavity of the housing (1.1). The plunger assembly (2) includes a plunger (2.1) and a plunger sleeve (2.11) disposed at one end of the plunger (2.1). The plunger assembly (2) is provided with a leather strap. Bowl (6); the plunger assembly (2) has a plunger sleeve (2.11) at one end which is movably disposed in the inner cavity of the housing assembly (1), and the plunger sleeve (2.11) and the inner cavity of the housing assembly (1) form a first volume chamber (1.4), which is connected to the oil outlet (1.2.1); the cup (6) divides the inner cavity of the housing assembly (1) into a second volume chamber (1.5) and a third volume chamber (1.6). In the initial state, the second volume chamber (1.5) is connected to the oil inlet (1.3) through the second channel (1.8), and the third volume chamber (1.6) is connected to the oil inlet (1.3) through the first channel (1.7); its characteristic is: A plunger cavity (2.1.1) is provided at one end of the plunger (2.11) adjacent to the plunger sleeve (2.11). The plunger cavity (2.1.1) is provided with first through holes (2.8) evenly distributed around its axis. The second volume cavity (1.5) is connected to the plunger cavity (2.1.1) through the first through holes (2.8). A one-way valve (2.12) is provided at one end of the plunger cavity (2.1.1) adjacent to the plunger sleeve (2.11). The one-way valve (2.12) controls the connection and disconnection between the first volume cavity (1.4) and the plunger cavity (2.1.1).

2. The plunger-type booster brake pump with a one-way valve according to claim 1, characterized in that: The plunger cavity (2.1.1) is also provided with several damping orifices evenly distributed around its axis. 2.1.2), the second volume chamber (1.5) and the third volume chamber (1.6) are connected through the first through hole (2.8), the plunger chamber (2.1.1), and the damping hole (2.1.2).

3. The plunger-type booster brake pump with a one-way valve according to claim 1, characterized in that: The housing assembly (1) includes a housing (1.1), an oil outlet cap (1.2), a plunger sealing ring (3), and a sealing ring fixing ring (4). The oil outlet cap (1.2) is fixedly installed at one end of the housing (1.1), and the plunger sealing ring (3) and the sealing ring fixing ring (4) are fixedly installed at the other end of the housing (1.1). The housing (1.1) is provided with an oil inlet (1.3), a first channel (1.7), and a second channel (1.8). The oil inlet (1.3) is connected to the inner cavity of the housing (1.1) through the first channel (1.7) and the second channel (1.8). The oil outlet cap (1.2) is provided with an oil outlet (1.2.1) at the end away from the housing (1.1).

4. The plunger-type booster brake pump with a one-way valve according to claim 2, characterized in that: The leather cup (6) is set in the inner cavity of the housing (1.1); the plunger sleeve (2.11) is set in the inner cavity of the housing (1.1) and the oil outlet cap (1.2).

5. The plunger-type booster brake pump with a one-way valve according to claim 1, characterized in that: The oil outlet cap (1.2) is provided with a pressure balance ring (1.2.2) at the adjacent end of the housing (1.1), and a number of pressure balance holes (2.11.1) are evenly distributed around the axis on the plunger sleeve (2.11). In the initial state, the pressure balance hole (2.11.1) is located at the pressure balance ring (1.2.2), and the first volume chamber (1.4) is connected to the second volume chamber (1.5) through the pressure balance hole (2.11.1).

6. The plunger-type booster brake pump with a one-way valve according to claim 1, characterized in that: A plunger assembly return spring (2.4) is provided between the plunger assembly (2) and the housing assembly (1).

7. The plunger-type booster brake pump with a one-way valve according to claim 1, characterized in that: A one-way valve reset spring retaining ring (2.14) is fixedly installed at the outer end of the plunger cavity (2.1.1), and a one-way valve reset spring (2.13) is installed between the one-way valve (2.12) and the one-way valve reset spring retaining ring (2.14).

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