Hydraulic vehicle door stopper

Abstract

This invention discloses a hydraulic door limiter, comprising an actuator, a first hydraulic pipe, a second hydraulic pipe, and a hydraulic power unit. The hydraulic power unit includes a valve body and an external oil tank assembly. Inside the valve body are a first check valve, a second check valve, a third check valve, and a fourth check valve. The inlet of the first check valve is connected to the oil tank assembly, and the outlet of the first check valve is connected to the first hydraulic pipe. The inlet of the second check valve is connected to the oil tank assembly, and the outlet of the second check valve is connected to the second hydraulic pipe. The inlet of the third check valve is connected to both the first hydraulic pipe and the outlet of the first check valve, and the outlet of the third check valve is connected to both the oil tank assembly and the outlet of the fourth check valve. The inlet of the fourth check valve is connected to both the outlet of the second check valve and the second hydraulic pipe. This invention can control the opening, closing, and stopping of the door at any position.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle door technology, specifically to a hydraulic door limiter. Background Technology

[0002] With the popularization of electric vehicles, electric vehicles are gradually developing towards intelligence. The automatic door opening system of electric vehicles is also constantly developing and optimizing towards intelligence. However, the cost of intelligent electric door opening system is relatively high, and it is mainly configured on some high-end luxury models. In low-end models, in order to reduce manufacturing costs, manufacturers still use traditional hinged door limiters.

[0003] Traditional hinged door limiters can only remain stationary in a relatively limited position when the door is opened or closed, and cannot maintain a position at any time. Especially in the confined space of a parking space, when the door is opened, it cannot stay in the preset position, resulting in a small opening angle, which is not conducive to passenger use. In addition, if a child fails to open the door to the predetermined holding position while opening it, the door may fall back, causing injury and safety hazards. Summary of the Invention

[0004] To address the above problems, the present invention provides a hydraulic door limiter.

[0005] The technical solutions to the above technical problems are as follows:

[0006] A hydraulic door limiter includes an actuator, a first hydraulic pipe, and a second hydraulic pipe. One end of the first hydraulic pipe engages with one end of the actuator, and one end of the second hydraulic pipe engages with the other end of the actuator. The device also includes a hydraulic power unit, comprising a valve body and an external oil tank assembly. Inside the valve body are a first check valve, a second check valve, a third check valve, and a fourth check valve. The inlet of the first check valve is connected to the oil tank assembly, and the outlet of the first check valve is connected to the first hydraulic pipe. The inlet of the second check valve is connected to the oil tank assembly, and the outlet of the second check valve is connected to the second hydraulic pipe. The inlet of the third check valve is connected to both the first hydraulic pipe and the outlet of the first check valve, and the outlet of the third check valve is connected to both the oil tank assembly and the outlet of the fourth check valve. The inlet of the fourth check valve is connected to both the outlet of the second check valve and the second hydraulic pipe.

[0007] Furthermore, the execution unit includes a cylinder body and a piston rod. One end of the cylinder body is provided with a cylinder bottom. The cylinder body is also provided with a first interface and a second interface. The piston rod cooperates with the cylinder body. The end of the piston rod is provided with a rod head. The first interface is connected to a first hydraulic pipe, and the second interface is connected to a second hydraulic pipe.

[0008] Furthermore, the fuel tank assembly includes a fuel tank housing, which is fixedly connected to a valve body. The valve body has a recessed cavity, and the fuel tank housing and the recessed cavity of the valve body form a stroke cavity. A spring and a piston rod are provided in the stroke cavity. A sealing ring is provided on the piston rod. One end of the spring is connected to the piston rod, and the other end of the spring abuts against the fuel tank housing. The piston rod also cooperates with the wall of the recessed cavity, and the wall of the recessed cavity also cooperates with the sealing ring.

[0009] Furthermore, the cylinder body is provided with a guide sleeve and a piston. The guide sleeve is installed inside the cylinder body, and the piston is sleeved on the piston rod, with the piston engaging with the inner wall of the cylinder body.

[0010] The beneficial effects of this invention are:

[0011] 1. This invention uses four check valves within the valve body to control the flow of hydraulic oil, thereby enabling the actuator to control the opening, closing, and hovering of the door at any position. This invention provides a large locking force while minimizing noise.

[0012] 2. This invention has a simple structure and low manufacturing cost, making it more suitable for low-end car models;

[0013] 3. Because this invention uses hydraulic drive, it has a lower failure rate and is more reliable in use;

[0014] 4. The execution unit and the hydraulic power unit of the present invention are connected by a first hydraulic pipe and a second hydraulic pipe, which realizes the separate arrangement of the execution unit and the hydraulic power unit, saving a lot of space and making installation more convenient. Attached Figure Description

[0015] Figure 1 This is a perspective view of the hydraulic door limiter of the present invention.

[0016] Figure 2 This is a cross-sectional view of the hydraulic door limiter actuator unit of the present invention.

[0017] Figure 3 This is a cross-sectional view of the hydraulic power unit of the hydraulic door limiter of the present invention.

[0018] Figure 4 This is a schematic diagram illustrating the working principle of the hydraulic door limiter of the present invention.

[0019] Figure 5 This is a diagram showing the internal structure of the hydraulic power unit of the hydraulic door limiter of the present invention.

[0020] The markings in the attached diagram are as follows: valve body 1, cavity 1a, first hydraulic pipe 3, second hydraulic pipe 4, first check valve 10, second check valve 11, third check valve 12, first valve ball 12-1, first valve cap 12-2, first spring 12-3, first plug bolt 12-4, fourth check valve 13, second valve ball 13-1, second valve cap 13-2, second spring 13-3, second plug bolt 13-4, cylinder body 20, guide sleeve 20a, piston 20b, cylinder bottom 20-1, piston rod 21, first interface 20-2, second interface 20-3, rod head 21-1, oil tank housing 30, stroke inner cavity 31, spring 32, piston column 33, sealing ring 34. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 4 As shown, a hydraulic door limiter includes an actuator unit, a first hydraulic pipe 3, and a second hydraulic pipe 4. One end of the first hydraulic pipe 3 engages with one end of the actuator unit, and one end of the second hydraulic pipe 4 engages with the other end of the actuator unit. It also includes a hydraulic power unit, which comprises a valve body 1 and an external oil tank assembly. The valve body 1 contains a first check valve 10, a second check valve 11, a third check valve 12, and a fourth check valve 13. The inlet end of the first check valve 10 is connected to the oil tank assembly. The first check valve 10 has its outlet end connected to the first hydraulic pipe 3, the second check valve 11 has its inlet end connected to the oil tank assembly, and the second check valve 11 has its outlet end connected to the second hydraulic pipe 4. The third check valve 12 has its inlet end connected to the first hydraulic pipe 3 and the outlet end of the first check valve 10, and the third check valve 12 has its outlet end connected to the oil tank assembly and the outlet end of the fourth check valve 13. The fourth check valve 13 has its inlet end connected to the outlet end of the second check valve 11 and the second hydraulic pipe 4.

[0023] Specifically, one end of the actuator is fixed inside the door, and the other end is connected to the vehicle body. The valve body 1 has multiple oil passages. The first check valve 10, the second check valve 11, the third check valve 12, and the fourth check valve 13 are connected to each other through the oil passages inside the valve body 1. The valve body 1 has at least two oil ports, which are respectively connected to the first hydraulic pipe 3 and the second hydraulic pipe 4. The actuator realizes reciprocating linear motion under the action of external load. The first check valve 10, the second check valve 11, the third check valve 12, and the fourth check valve 13 realize the supply of hydraulic oil and the control of oil circuit opening and closing, thereby realizing the control and maintenance of the reciprocating linear motion of the actuator, and finally the opening and closing and holding functions of the door.

[0024] The execution unit includes a cylinder body 20 and a piston rod 21. One end of the cylinder body 20 is provided with a cylinder bottom 20-1. The cylinder body 20 is also provided with a first interface 20-2 and a second interface 20-3. The piston rod 21 cooperates with the cylinder body 20. The end of the piston rod 21 is provided with a rod head 21-1. The first interface 20-2 is connected to the first hydraulic pipe 3, and the second interface 20-3 is connected to the second hydraulic pipe 4.

[0025] Specifically, the cylinder body 20 is fixed inside the car door, the first interface 20-2 and the second interface 20-3 are metal tubes, the first interface 20-2 and the second interface 20-3 are connected to the cylinder body 20, the rod head 21-1 at the axial end of the piston rod 21 is connected to the car body, and the cylinder bottom 20-1 at the axial end of the cylinder body 20 is engaged with the car door.

[0026] The fuel tank assembly includes a fuel tank housing 30, which is fixedly connected to a valve body 1. The valve body 1 has a cavity 1a. The fuel tank housing 30 and the cavity 1a of the valve body 1 form a stroke inner cavity 31. A spring 32 and a piston rod 33 are provided in the stroke inner cavity 31. A sealing ring 34 is provided on the piston rod 33. One end of the spring 32 is connected to the piston rod 33, and the other end of the spring 32 abuts against the fuel tank housing 30. The piston rod 33 also cooperates with the wall surface of the cavity 1a, and the wall surface of the cavity 1a also cooperates with the sealing ring 34.

[0027] Specifically, the sealing ring 34 prevents hydraulic oil from entering the upstream of the stroke cavity 31 through the gap between the piston rod 33 and the cavity 1a, so that the hydraulic oil is always kept in the downstream position of the piston rod 33.

[0028] The cylinder body 20 is provided with a guide sleeve 20a and a piston 20b. The guide sleeve 20a is installed inside the cylinder body 20, and the piston 20b is sleeved on the piston rod 21. The piston 20b cooperates with the inner wall of the cylinder body 20.

[0029] The working process of the present invention will be further explained below:

[0030] Specifically, the third check valve 12 includes a first valve ball 12-1, a first valve cap 12-2, a first spring 12-3, and a first plug bolt 12-4; the fourth check valve 13 includes a second valve ball 13-1, a second valve cap 13-2, a second spring 13-3, and a second plug bolt 13-4. The first plug bolt 12-4 is connected to the valve body 1. One end of the first spring 12-3 abuts against the first plug bolt 12-4, and the other end of the first spring 12-3 is connected to the first valve cap 12-2. The first valve ball 12-1 mates with an oil hole in the valve body 1, and the first valve cap 12-2 also mates with an oil hole in the valve body 1 (specifically as follows). Figure 5As shown in the attached diagram (the oil holes inside valve body 1 are not labeled), the second plug bolt 13-4 is connected to valve body 1, one end of the second spring 13-3 abuts against the second plug bolt 13-4, and the other end of the second spring 13-3 is connected to the second valve cap 13-2. The second valve ball 13-1 mates with another oil hole inside valve body 1, and the second valve cap 13-2 also mates with another oil hole inside valve body 1 (specifically as shown in the attached diagram). Figure 5 As shown in the attached figure, the other oil hole inside valve body 1 is not labeled.

[0031] according to Figure 4 As shown, when the car door is opened, the piston rod 21 extends outward under the pulling force of the car door. The oil in chamber q2 of the cylinder body 20 is pressurized and the pressure increases, resulting in a back pressure state. The hydraulic oil enters the third check valve 12 from the inlet end of the first hydraulic pipe 3. The hydraulic oil pushes open the first valve ball 12-1 and the first valve cap 12-2 of the third check valve 12, causing the first valve ball 12-1 and the first valve cap 12-2 to compress the elastic force of the first spring 12-3. This allows the hydraulic oil to enter the oil hole in the valve body 1 from the outlet end of the third check valve 12, and finally return to the downstream end of the stroke inner cavity 31 (i.e., the cavity between the bottom of the concave cavity 1a and the piston rod 33). As the piston rod 21 extends outward, a vacuum is formed in the q1 chamber of the cylinder 20, which is in a state of underpressure. At this time, the spring 32 releases its elastic force, pressing the piston rod 33 to move downward in the concave cavity 1a. This causes the piston rod 33 to squeeze the hydraulic oil in the chamber between the bottom of the concave cavity 1a and the piston rod 33. With the assistance of the spring 32, the hydraulic oil in the chamber between the bottom of the concave cavity 1a and the piston rod 33 overcomes the valve core of the second check valve 11, allowing the hydraulic oil to enter from the inlet end of the second check valve 11 and flow out from the outlet end of the second check valve 11. Then, it enters the q1 chamber of the cylinder 20 through the second hydraulic pipe 4, thereby replenishing the hydraulic oil in the q1 chamber.

[0032] When the car door is closed, the piston rod 21 is pushed into the cylinder 20 by the door. The hydraulic oil in chamber q1 of the cylinder 20 is compressed by the piston 20b, and the hydraulic oil enters the fourth check valve 13 from the inlet end of the second hydraulic pipe 4. The hydraulic oil pushes open the second valve ball 13-1 and the second valve cap 13-2 of the fourth check valve 13, causing the second valve ball 13-1 and the second valve cap 13-2 to compress the elastic force of the second spring 13-3. As a result, the hydraulic oil enters the oil hole of the valve body 1 from the outlet end of the fourth check valve 13, and finally returns to the downstream end of the stroke inner cavity 31 (i.e., the bottom of the concave cavity 1a and the piston rod). Similarly, when the piston rod 21 retracts into the cylinder 20, the q2 chamber in the cylinder 20 forms a vacuum and is in a state of underpressure. When the hydraulic oil returns to the downstream end of the stroke inner cavity 31 (i.e., the chamber between the bottom of the concave cavity 1a and the piston rod 33), the hydraulic oil will first squeeze the piston rod 33 to move upward in the concave cavity 1a and squeeze the spring 32. However, the q2 chamber gradually becomes larger, and the hydraulic oil in the q2 chamber is not enough to satisfy the q2 chamber. At this time, the spring 32 will still release its elastic force under pressure, causing the piston rod 33 to squeeze the hydraulic oil, so that the hydraulic oil enters the q2 chamber of the cylinder 20 through the first one-way valve 10.

[0033] Under the pulling force of the car door, hydraulic oil flows continuously in chambers q1 and q2, causing piston 20b to push piston rod 21 to form a reciprocating linear motion. Guide sleeve 20a serves as a guide on the one hand and a seal for chamber q2 on the other.

[0034] In this embodiment, the opening pressure of the first check valve 10 and the second check valve 11 is lower than that of the third check valve 12 and the fourth check valve 13. This setting facilitates the timely entry of hydraulic oil into the q1 or q2 chamber, preventing hydraulic oil from being sucked into the air and causing the piston rod 21 to rebound. At the same time, a spring 32 is installed inside the oil tank housing 30. The spring 32 is compressed due to the restriction of the piston rod 33 and the oil tank housing 30. That is, the hydraulic oil at the downstream end of the stroke cavity 31 (i.e., the cavity between the bottom of the concave cavity 1a and the piston rod 33) is in a back pressure state. When the q1 or q2 chamber in the cylinder 20 is in a low pressure state, the spring 32 releases its elastic force, and the piston rod 33 pushes the hydraulic oil to overcome the pressure of the first check valve 10 or the second check valve 11, so that the hydraulic oil can enter the q1 or q2 chamber in a timely manner.

[0035] When the car door opens to the desired angle, the piston rod 21 stops extending outward, and the hydraulic oil in chamber q2 is no longer pushed by the piston 20b. Consequently, the hydraulic oil pressure in chamber q2 is insufficient to overcome the opening pressure of the third check valve 12, preventing the hydraulic oil in chamber q2 from returning to the stroke inner chamber 31. At the same time, chamber q1 is already full of hydraulic oil, and the underpressure phenomenon stops, leading to an increase in pressure. The valve core of the second check valve 11 closes, thereby stopping the piston rod 21 and keeping it in the current position, ultimately achieving the car door hovering in any position.

[0036] Finally, it should be noted that the above-described embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit them, much less limit the scope of protection of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of protection of the claims.

Claims

1. A hydraulic door limiter, comprising an execution unit, a first hydraulic pipe (3), and a second hydraulic pipe (4), wherein one end of the execution unit is fixed inside the door and the other end of the execution unit is connected to the vehicle body; One end of the first hydraulic pipe (3) is engaged with one end of the actuator, and one end of the second hydraulic pipe (4) is engaged with the other end of the actuator. The characteristic of this design is that... Also includes: The hydraulic power unit includes a valve body (1), an external oil tank assembly for the valve body (1), and a first check valve (10), a second check valve (11), a third check valve (12), and a fourth check valve (13) inside the valve body (1). The oil inlet of the first check valve (10) is connected to the oil tank assembly, and the oil outlet of the first check valve (10) is connected to the first hydraulic pipe (3). The oil inlet of the second check valve (11) is connected to the oil tank assembly, and the oil outlet of the second check valve (11) is connected to the second hydraulic pipe (4). The oil inlet of the third check valve (12) is connected to the first hydraulic pipe (3) and the oil outlet of the first check valve (10), respectively. The oil outlet of the third check valve (12) is connected to the oil tank assembly and the oil outlet of the fourth check valve (13), respectively. The oil inlet of the fourth check valve (13) is connected to the oil outlet of the second check valve (11) and the second hydraulic pipe (4), respectively. The execution unit includes a cylinder (20) and a piston rod (21). One end of the cylinder (20) is provided with a cylinder bottom (20-1). The cylinder (20) is also provided with a first interface (20-2) and a second interface (20-3). The piston rod (21) cooperates with the cylinder (20). The end of the piston rod (21) is provided with a rod head (21-1). The first interface (20-2) is connected to the first hydraulic pipe (3), and the second interface (20-3) is connected to the second hydraulic pipe (4).

2. A hydraulic door limiter according to claim 1, characterized in that, The oil tank assembly includes an oil tank housing (30), which is fixedly connected to a valve body (1). The valve body (1) has a cavity (1a). The oil tank housing (30) and the cavity (1a) of the valve body (1) form a stroke cavity (31). The stroke cavity (31) is provided with a spring (32) and a piston rod (33). The piston rod (33) is provided with a sealing ring (34). One end of the spring (32) is connected to the piston rod (33), and the other end of the spring (32) abuts against the oil tank housing (30). The piston rod (33) also cooperates with the wall of the cavity (1a), and the wall of the cavity (1a) also cooperates with the sealing ring (34).

3. A hydraulic door limiter according to claim 1, characterized in that, The cylinder (20) is provided with a guide sleeve (20a) and a piston (20b). The guide sleeve (20a) is installed inside the cylinder (20), and the piston (20b) is sleeved on the piston rod (21). The piston (20b) is in contact with the inner wall of the cylinder (20).

Images