A pressure relief valve structure suitable for a hydraulic brake system of an automobile
By designing a pressure relief valve structure, the problem of motor damage in brake-by-wire products during ABS operation was solved, achieving motor protection and controllable system pressure, thus improving overall vehicle safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JILIN DONGGUANG AOWEI AUTOMOBILE BRAKE SYST
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-26
AI Technical Summary
When the ABS system is in operation, the pressure backflow in the brake-by-wire product causes the motor load to exceed the limit torque, resulting in motor damage.
A pressure relief valve structure was designed, including a valve body, an inlet sealing seat, an outlet sealing seat, a valve core component, a valve core spring, and a limit valve seat. By combining the sealing valve core, sealing steel ball, and sealing seat, and combining the structure of the valve core spring and the limit valve seat, the elastic force of the valve core spring and the length of the limit valve seat are controlled to achieve the adjustment of different pressure reduction opening pressures and pressure reduction ranges.
It effectively protects the motor, prevents motor damage, improves overall vehicle safety, ensures controllable system pressure reduction, and provides better adaptability and flexibility.
Smart Images
Figure CN224409211U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive brake-by-wire systems, specifically relating to a pressure relief valve structure suitable for automotive hydraulic braking systems. Background Technology
[0002] With the development of the automotive industry, brake-by-wire products have gradually become a major development direction in the braking market. In application, brake-by-wire products offer faster braking response time, more precise control accuracy, intelligent control, and energy recovery capabilities, gaining widespread market recognition. However, because hydraulic brake-by-wire products use a motor to rotate and drive a piston to build pressure, the instantaneous pressure backflow during ABS activation can cause the motor load to exceed the limit torque, resulting in motor damage. To protect brake-by-wire products from damage during ABS operation, a device to address pressure backflow needs to be researched. Summary of the Invention
[0003] This utility model provides a pressure relief valve structure suitable for automotive hydraulic braking systems to solve the problem that when ABS is working, the pressure backflow causes the motor load to exceed the limit torque, resulting in motor damage.
[0004] The technical solution adopted by this utility model includes a valve body, an inlet sealing seat, an outlet sealing seat, a valve core component, a valve core spring, and a limit valve seat. The inlet sealing seat is interference-fitted into the valve body, the outlet sealing seat is interference-fitted into the limit valve seat, the limit valve seat is threadedly connected to the valve body, the valve core component is assembled in the inner cavity formed by the valve body and the limit valve seat, and the valve core spring is sleeved on the outside of the valve core component.
[0005] The valve body has an inlet hole, a cavity, and a connecting thread, wherein the inlet hole is connected to the cavity, and the connecting thread is used to connect with the limit valve seat.
[0006] The liquid inlet sealing seat has a second liquid inlet hole, which is connected to the first liquid inlet hole of the valve body.
[0007] The liquid outlet sealing seat has one liquid outlet hole.
[0008] The valve core component includes an inlet sealing steel ball, a sealing valve core, and an outlet sealing steel ball, wherein the inlet sealing steel ball and the outlet sealing steel ball are respectively interference-fitted to the inlet end and the outlet end of the sealing valve core.
[0009] The sealing valve core has a valve core spring seat.
[0010] By selecting different spring force values for the valve core spring, the system can meet the needs of different pressure reduction opening pressures and pressure reduction ranges.
[0011] The limit valve seat has a second liquid outlet and a sealing flange. The second liquid outlet is connected to the first liquid outlet of the liquid outlet sealing seat, and the sealing flange is used to seal with the end face of the valve body.
[0012] By selecting different lengths of the limit valve seat entering the valve body, the system's customized requirements for different pressure reduction opening pressures and pressure reduction ranges can be met.
[0013] The advantages of this invention are its novel structure. By employing a combination of a sealing valve core, sealing steel balls, and a sealing seat, it achieves excellent sealing performance. The use of a valve core spring and a limiting valve seat structure allows for customization of different pressure reduction opening pressures and pressure reduction ranges according to system needs, through control of the spring force of the valve core spring and the length of the limiting valve seat entering the valve body. This provides better adaptability, flexible system matching, and controllable system pressure reduction, ensuring that pressure is maintained even during pressure reduction. Furthermore, this invention relieves pipeline pressure when the system pressure exceeds the motor's rated load, thereby protecting the motor, effectively reducing system pressure overload, and improving overall vehicle safety. Attached Figure Description
[0014] Figure 1 This is an overall view of the pressure relief valve mentioned in this invention;
[0015] Figure 2 This is a view showing the assembly method of the valve body and the oil inlet sealing seat used in this invention.
[0016] Figure 3 This is a view showing the assembly method used for riveting the limiting seat and sealing seat in this invention.
[0017] Figure 4 This is a view showing the connection method between the sealing valve core and the sealing steel ball used in this invention; Detailed Implementation
[0018] See Figure 1 The valve includes a valve body 1, an inlet sealing seat 2, an outlet sealing seat 3, a valve core component 4, a valve core spring 5, and a limit valve seat 6. The inlet sealing seat 2 is interference-fitted into the valve body 1, the outlet sealing seat 3 is interference-fitted into the limit valve seat 6, the limit valve seat 6 is threadedly connected to the valve body 1, the valve core component 4 is assembled in the inner cavity formed by the valve body 1 and the limit valve seat 6, and the valve core spring 5 is sleeved on the outside of the valve core component 4.
[0019] See Figure 2 The valve body 1 has an inlet hole 101, a cavity 102 and a connecting thread 103, wherein the inlet hole 101 is connected to the cavity 102 and the connecting thread 103 is used to be threadedly connected to the limit valve seat 6.
[0020] See Figure 2The liquid inlet sealing seat 2 has a second liquid inlet hole 201, which is connected to the first liquid inlet hole 101 of the valve body 1.
[0021] See Figure 3 The liquid outlet sealing seat 3 has a liquid outlet hole 301.
[0022] See Figure 4 The valve core component 4 includes an inlet sealing steel ball 401, a sealing valve core 402, and an outlet sealing steel ball 403, wherein the inlet sealing steel ball 401 and the outlet sealing steel ball 403 are respectively interference-fitted to the inlet end and the outlet end of the sealing valve core 402.
[0023] See Figure 4 The sealing valve core 402 has a valve core spring seat 40201.
[0024] By selecting different spring force values for the valve core spring 5, the system can meet the needs of different pressure reduction opening pressures and pressure reduction ranges.
[0025] See Figure 3 The limiting valve seat 6 has a second liquid outlet 601 and a sealing flange 602. The second liquid outlet 601 is connected to the first liquid outlet 301 of the liquid outlet sealing seat 3, and the sealing flange 602 is used to seal with the end face of the valve body 1.
[0026] By selecting different lengths of the limit valve seat 6 entering the valve body 1, the system can meet the needs of different pressure reduction opening pressures and pressure reduction ranges.
[0027] Working principle
[0028] The inlet port 101 of valve body 1 is connected to the hydraulic circuit of the braking system. When ABS is activated, when the braking pressure reaches the system's set threshold, the brake fluid overcomes the resistance of the valve core spring 5, pushing the sealing valve core 402 to move. The cavity 102 absorbs some brake fluid, reducing the system pressure. Because the displacement of the sealing valve core 402 is limited, the system can absorb some hydraulic pressure without causing the pressure to disappear completely, thus ensuring the pressure required for ABS function, thereby protecting the motor and improving the overall vehicle safety. When the braking pressure is less than the system's set threshold, the valve core spring 5 uses its elasticity to seal the inlet port 101 of the valve body with the sealing steel ball 401 at the valve core component 4. The brake fluid in the cavity 102 flows out through the outlet port 301 and the outlet port 601.
[0029] By employing a combination of sealing valve core, sealing steel ball and sealing seat, it has good sealing performance. Using the structure of valve core spring 5 and limit valve seat 6, by controlling the elasticity of valve core spring 5 and the length of limit valve seat 6 entering the valve body, different pressure reduction opening pressure and pressure reduction range can be customized according to system needs, which has better adaptability. The system pressure reduction value is controllable, and the system can still maintain pressure while reducing pressure.
Claims
1. A pressure relief valve structure suitable for automotive hydraulic braking systems, characterized in that: The valve includes a valve body, an inlet sealing seat, an outlet sealing seat, a valve core assembly, a valve core spring, and a limit valve seat. The inlet sealing seat is interference-fitted into the valve body, the outlet sealing seat is interference-fitted into the limit valve seat, the limit valve seat is threadedly connected to the valve body, the valve core assembly is assembled in the cavity formed by the valve body and the limit valve seat, and the valve core spring is sleeved on the outside of the valve core assembly.
2. The pressure relief valve structure for an automotive hydraulic braking system according to claim 1, characterized in that: The valve body has an inlet hole, a cavity, and a connecting thread, wherein the inlet hole is connected to the cavity, and the connecting thread is used to connect with the limit valve seat.
3. The pressure relief valve structure for an automotive hydraulic braking system according to claim 1, characterized in that: The liquid inlet sealing seat has a second liquid inlet hole, which is connected to the first liquid inlet hole of the valve body.
4. The pressure relief valve structure for an automotive hydraulic braking system according to claim 1, characterized in that: The liquid outlet sealing seat has one liquid outlet hole.
5. The pressure relief valve structure for an automotive hydraulic braking system according to claim 1, characterized in that: The valve core component includes an inlet sealing steel ball, a sealing valve core, and an outlet sealing steel ball, wherein the inlet sealing steel ball and the outlet sealing steel ball are respectively interference-fitted to the inlet end and the outlet end of the sealing valve core.
6. The pressure relief valve structure for an automotive hydraulic braking system according to claim 5, characterized in that: The sealing valve core has a valve core spring seat.
7. The pressure relief valve structure for an automotive hydraulic braking system according to claim 1, characterized in that: By selecting different spring force values for the valve core spring, the system can meet the needs of different pressure reduction opening pressures and pressure reduction ranges.
8. The pressure relief valve structure for an automotive hydraulic braking system according to claim 1, characterized in that: The limit valve seat has a second liquid outlet and a sealing flange. The second liquid outlet is connected to the first liquid outlet of the liquid outlet sealing seat, and the sealing flange is used to seal with the end face of the valve body.
9. A pressure relief valve structure suitable for an automotive hydraulic braking system according to claim 8, characterized in that: By selecting different lengths of the limit valve seat entering the valve body, the system's customized requirements for different pressure reduction opening pressures and pressure reduction ranges can be met.