Oil injection device for oil brakes

Abstract

The present invention discloses an oil injection device for an oil brake, which includes an oil injection main body provided with a flow channel, a first state switching device cooperating with the flow channel, and a second state switching device cooperating with the flow channel. The first state switching device is configured to switch the operating state of the oil injection device between a vacuum pumping state and an oil injection state, and the second state switching device is configured to switch the operating state of the oil injection device between an oil injection state and a pressure relief state. At least one of the first state switching device and the second state switching device includes a first piston, the first piston is movably installed in the flow channel, and the first piston can reciprocate in the flow channel so that at least one of the first state switching device and the second state switching device can realize the corresponding switching of the operating state of the oil injection device. The oil injection device of the present invention only needs to drive the first piston to reciprocate in the flow channel, and the oil injection device can be switched between the corresponding operating devices, and the operation is relatively simple.

Description

Technical Field

[0001] The present invention relates to the technical field of oil injection, and particularly to an oil injection device for an oil brake. Background Art

[0002] An oil hydraulic disc brake (i.e., an oil brake) is a braking device that realizes the braking effect by pushing the brake pads through the internal oil. It is usually applied to bicycles. When there is a lot of air in the oil inside the oil hydraulic disc brake, it will affect the braking effect of the oil hydraulic disc brake. Therefore, the oil hydraulic disc brake usually needs to be refilled with oil by using a specific oil injection device.

[0003] Currently, the oil injection device usually has a vacuum hole and an oil injection hole. A piston is correspondingly provided for each of the vacuum hole and the oil injection hole. During use, first, the piston cooperating with the vacuum hole is driven to rise, so that the vacuum hole is communicated with the oil hydraulic disc brake. Then, the piston cooperating with the oil injection hole is driven to descend to block the oil injection hole for vacuuming operation. After the vacuuming is completed, the piston cooperating with the vacuum hole is driven to descend to block the vacuum hole. Then, the piston cooperating with the oil injection hole is driven to rise to communicate the oil injection hole with the oil hydraulic disc brake, and the oil injection device can inject oil into the oil hydraulic disc brake through the oil injection hole. Since it is necessary to drive the two pistons to move successively during the vacuuming and oil injection processes, the control of the oil injection device is relatively troublesome. Moreover, there will be a certain time difference during the successive movement of the two pistons, so the vacuuming effect will be affected, resulting in a certain amount of air in the oil hydraulic disc brake, thereby affecting the braking effect of the oil hydraulic disc brake. Summary of the Invention

[0004] In view of this, the present invention provides an oil injection device for an oil brake to solve the problem that the existing oil injection device is relatively troublesome to control because it needs to control two pistons successively during the process of switching the operation state.

[0005] An oil injection device for an oil brake, the oil injection device can be selectively operated in a vacuum state, an oil injection state, and a pressure relief state. The oil injection device includes:

[0006] An oil injection main body provided with a flow channel;

[0007] A first state switching device cooperating with the flow channel, the first state switching device is configured to switch the operation state of the oil injection device between the vacuum state and the oil injection state; and

[0008] A second state switching device cooperating with the flow channel, the second state switching device is configured to switch the operation state of the oil injection device between the oil injection state and the pressure relief state;

[0009] At least one of the first state switching device and the second state switching device includes a first piston, the first piston is movably installed in the flow channel, and the first piston can reciprocate in the flow channel so that at least one of the first state switching device and the second state switching device realizes the corresponding switching of the operating state of the oil injection device.

[0010] In some embodiments, the flow channel includes a first piston channel and a connection channel communicating with the first piston channel. The first piston is movably installed in the first piston channel. A first seal is provided on the first piston. The first seal divides the first piston channel into two first channel spaces on both sides of the first seal. The first piston can reciprocate in the first piston channel to drive the first seal across the connection channel, so that the connection channel switches between communicating with one of the first channel spaces and communicating with the other first channel space.

[0011] In some embodiments, the first state switching device includes the first piston and the first seal. An oil injection hole and a vacuum pumping hole are provided on the oil injection main body. The oil injection hole and the vacuum pumping hole are respectively located on opposite sides of the first seal and communicate with the corresponding first channel spaces respectively. The first piston reciprocates in the first piston channel to make the vacuum pumping hole communicate with the connection channel or make the oil injection hole communicate with the connection channel, so as to switch the operating state of the oil injection device between the vacuum pumping hole state and the oil injection state.

[0012] In some embodiments, the first seal includes a first connecting portion sleeved outside the first piston and a first sealing portion surrounding the edge of the first connecting portion. The first sealing portion has elasticity, and the first sealing portion extends obliquely outward from the first connecting portion toward the oil injection hole; and / or

[0013] Second seals that are hermetically fitted to the inner wall of the first piston channel are respectively sleeved at both ends of the first piston. The oil injection hole, the vacuum pumping hole and the first seal are all located between the two second seals, and the two first channel spaces are located between the two second seals and the first seal.

[0014] In some embodiments, the flow channel includes a second piston channel spaced from the first piston channel. The first piston channel and the second piston channel are communicated through the connection channel. The second state switching device includes a second piston movably installed in the second piston channel. The oil injection main body is provided with an oil outlet hole and a pressure relief hole communicated with the second piston. The second piston can reciprocate in the second piston channel to communicate the oil outlet hole with the connection channel or to communicate the oil outlet hole with the pressure relief hole, so as to switch the operating state of the oil injection device between the oil injection state and the pressure relief state.

[0015] In some embodiments, a third seal is provided on the second piston. The third seal is located between the connection channel and the pressure relief hole. The third seal divides the second piston channel into two second channel spaces on both sides of the third seal. One of the second channel spaces is communicated with the connection channel, and the other second channel space is communicated with the pressure relief hole. The second piston can reciprocate in the second piston channel to drive the third seal to cross the oil outlet hole, so that the oil outlet hole switches between communicating with one of the second channel spaces and communicating with the other second channel space.

[0016] In some embodiments, there are two third seals. Each third seal includes a second connecting portion sleeved outside the second piston and a second sealing portion surrounding the edge of the second connecting portion. The second sealing portion has elasticity, and the two second sealing portions extend obliquely outward in opposite directions; and / or

[0017] A fourth seal is provided at one end of the second piston away from the pressure relief hole. The fourth seal is in sealing fit with the inner wall of the second piston channel. One of the connection channels is located between the fourth seal and the third seal.

[0018] In some embodiments, the second state switching device includes the first piston and the first seal. The oil injection main body is provided with an oil outlet hole and a pressure relief hole. The connection channel is the oil outlet hole. The pressure relief hole is communicated with one of the first channel spaces. The first piston can reciprocate in the first piston channel to communicate the oil outlet hole with the first channel space away from the pressure relief hole or to communicate the oil outlet hole with the pressure relief hole through the other first channel space, so as to switch the operating state of the oil injection device between the oil injection state and the pressure relief state.

[0019] In some embodiments, the oil injection device includes a recovery device communicated with the pressure relief hole.

[0020] In some embodiments, the oil injection main body includes a main body portion and two side portions respectively located on opposite sides of the main body portion. The flow channel, the vacuum pumping hole, the oil injection hole, and the oil outlet hole are all provided in the main body portion, and at least one of the side portions is provided with avoidance holes corresponding to the first piston channel and the second piston channel penetrating therethrough; and / or

[0021] The oil injection device includes two drivers, one of the drivers is connected to the first piston to drive the first piston to reciprocate in the first piston channel, and the other driver is connected to the second piston to drive the second piston to reciprocate in the second piston channel.

[0022] For the oil injection device provided by the present invention, only one first piston needs to be driven to reciprocate in the flow channel, so that the oil injection device can be switched between corresponding operating devices, that is, switched between a vacuum pumping state and an oil injection state, or switched between an oil injection state and a pressure relief state. It is not necessary to control two pistons, so the operation is relatively simple. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of an oil injection device provided by an embodiment of the present invention;

[0024] Figure 2 is Figure 1 a schematic diagram of the oil injection device in FIG. when a part of the main body portion is removed, and at this time the oil injection device is in a vacuum pumping state;

[0025] Figure 3 is Figure 2 a schematic diagram of the oil injection device shown in FIG. when it is in an oil injection state;

[0026] Figure 4 is Figure 2 a schematic diagram of the oil injection device shown in FIG. when it is in a pressure relief state;

[0027] Figure 5 is Figure 2 an exploded schematic diagram of the first state switching device shown in FIG. ;

[0028] Figure 6 is Figure 2 an exploded schematic diagram of the second state switching device shown in FIG. ;

[0029] Figure 7 is Figure 1 a cross-sectional schematic diagram of the oil injection main body shown in FIG.

[0030] In the figure: 1, an oil injection device; 10, an oil injection main body; 30, a first state switching device; 50, a second state switching device; 11, a flow channel; 31, a first piston; 111, a first piston channel; 113, a connecting channel; 33, a first seal; 331, a first channel space; 101, an oil injection hole; 103, a vacuum extraction hole; 333, a first connecting part; 335, a first sealing part; 35, a second seal; 115, a second piston channel; 105, an oil outlet hole; 107, a pressure relief hole; 51, a second piston; 53, a third seal; 531, a second channel space; 533, a second connecting part; 535, a second sealing part; 55, a fourth seal; 70, a connecting piece; 13, a main body part; 15, a side part; 151, an avoidance hole. Detailed implementation manners

[0031] Next, in combination with the accompanying drawings and specific implementation manners, the present invention will be further described. It should be noted that, on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined with each other to form new embodiments.

[0032] It should be noted that all the directional indications (such as up, down, left, right, front, back, inside, outside, top, bottom...) in the embodiments of the present invention are only used to explain the relative position relationship between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, the element can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0034] Please refer to Figures 1 to 4 , an oil injection device 1 provided by an embodiment of the present invention is used for an oil brake, such as an oil brake on a bicycle. The oil injection device 1 can be selectively operated in a vacuum extraction state, an oil injection state, and a pressure relief state, that is, the oil injection device 1 has these three operation states. During the process of injecting oil into the oil brake, first operate the oil injection device 1 to make it in the vacuum extraction state to extract the air in the oil brake, so as to avoid the existence of air in the oil brake affecting the braking effect and braking feel; then operate the oil injection device 1 to make it in the oil injection state, and use the oil injection device 1 to inject oil into the oil brake that has been vacuum extracted; after the oil injection is completed, operate the oil injection device 1 again to make it in the pressure relief state, so that the pressure of the oil in the oil brake can be released. After removing the oil brake from the oil injection device 1, the oil in the oil brake will not spray outwards.

[0035] The oil injection device 1 includes an oil injection main body 10, a first state switching device 30, and a second state switching device 50. The oil injection main body 10 is provided with a flow channel 11, and both the first state switching device 30 and the second state switching device 50 are engaged with the flow channel 11. The first state switching device 30 is configured to switch the operating state of the oil injection device 1 between a vacuum pumping state and an oil injection state, and the second state switching device 50 is configured to switch the operating state of the oil injection device 1 between the oil injection state and a pressure relief state. That is, an operator can switch the oil injection device 1 between the vacuum pumping state and the oil injection state by operating the first state switching device 30, and switch the oil injection device 1 between the oil injection state and the pressure relief state by operating the second state switching device 50.

[0036] In some embodiments, at least one of the first state switching device 30 and the second state switching device 50 includes a first piston 31, and the first piston 31 is movably installed in the flow channel 11. The first piston 31 can reciprocate in the flow channel 11 to enable at least one of the first state switching device 30 and the second state switching device 50 to achieve the corresponding switching of the operating state of the oil injection device 1. The corresponding switching means that when the first state switching device 30 includes the first piston 31, the first piston 31 can switch the operating state of the oil injection device 1 between the vacuum pumping state and the oil injection state; when the second switching device includes the first piston 31, the first piston 31 can switch the operating device of the oil injection device 1 between the oil injection state and the pressure relief state; when both the first state switching device 30 and the second state switching device 50 include the first piston 31, the first piston 31 of the first state switching device 30 can switch the operating state of the oil injection device 1 between the vacuum pumping state and the oil injection state, and the first piston 31 of the second state switching device 50 can switch the operating state of the oil injection device 1 between the oil injection state and the pressure relief state. By only driving one first piston 31 to reciprocate in the flow channel 11, the oil injection device 1 can be switched between two different operating states, that is, between the vacuum pumping state and the oil injection state or between the oil injection state and the pressure relief state, and the operation is relatively simple.

[0037] In some embodiments, the flow channel 11 includes a first piston channel 111 and a connection channel 113. The connection channel 113 is in communication with the first piston channel 111. The first piston channel 111 is movably installed in the first piston channel 111 so that the first piston channel 111 can reciprocate along its length direction within the first piston channel 111. A first seal 33 is provided on the first piston 31. The first seal 33 divides the first piston channel 111 into two first channel spaces 331 located on both sides of the first seal 33. When the first piston 31 reciprocates within the first piston channel 111, it can drive the first seal 33 to cross the connection channel 113, so that the connection channel 113 can switch between communicating with one of the channel spaces and communicating with the other channel space. By providing the first seal 33 on the first piston 31, the first piston channel 111 is divided into two first channel spaces 331 located on both sides of the first seal 33 by the first seal 33. The connection channel 113 is in communication with one of the first channel spaces 331. After the first piston 31 drives the first seal 33 to cross the connection channel 113, the connection channel 113 is in communication with the other first channel space 331. Since the first piston 31 can reciprocate within the first piston channel 111, the first piston 31 can cause the connection channel 113 to switch between communicating with one of the first channel spaces 331 and the other first channel space 331, thereby realizing the switching of the operating state of the oil injection device 1.

[0038] In the present application, the first state switching device 30 includes a first piston 31 and a first seal 33. The oil injection main body 10 is provided with an oil injection hole 101 and a vacuum pumping hole 103. The oil injection hole 101 is used for oil injection operation, and the vacuum pumping hole 103 is used for vacuum pumping operation. The oil injection hole 101 and the vacuum pumping hole 103 are respectively located on both sides of the first seal 33 and are respectively communicated with corresponding first channel spaces 331. That is, the oil injection hole 101 is communicated with the first channel space 331 on the side of the first seal 33 close to the oil injection hole 101, and the vacuum pumping hole 103 is communicated with the first channel space 331 on the side of the first seal 33 close to the vacuum pumping hole 103. The first piston 31 reciprocates in the first piston channel 111 to enable the vacuum pumping hole 103 to be communicated with the connection channel 113 through a first channel space 331 or enable the oil injection hole 101 to be communicated with the connection channel 113 through another first channel space 331, so as to realize the operation of switching the oil injection device 1 between the vacuum pumping state and the oil injection state. The vacuum pumping hole 103 and the oil injection hole 101 are located on the same side of the oil injection main body 10 and are arranged at intervals along the length direction of the first piston 31. The vacuum pumping hole 103 and the oil injection hole 101 are both communicated with a corresponding first channel space 331 and the outside, and the connection channel 113 and the first seal 33 are located between the vacuum pumping hole 103 and the oil injection hole 101. When the first piston 31 moves from the vacuum pumping hole 103 to the oil injection hole 101 direction and the first seal 33 crosses the connection channel 113, the vacuum pumping hole 103 is communicated with the connection channel 113 through a first channel space 331, while the oil injection hole 101 is not communicated with the connection channel 113. At this time, the oil injection device 1 is in the vacuum pumping hole 103 state, and the vacuum pumping operation can be carried out by using the vacuum pumping hole 103. After the vacuum pumping is completed, the first piston 31 is driven to move in the opposite direction, that is, from the oil injection hole 101 to the vacuum pumping hole 103 direction, and the first seal 33 crosses the connection channel 113. The oil injection hole 101 is communicated with the connection channel 113 through another first channel space 331, while the vacuum pumping hole 103 is not communicated with the connection channel 113. At this time, the oil injection device 1 is in the oil injection state, and the oil can be injected into the flow channel 11 by using the oil injection hole 101. Only by driving a first piston 31 to reciprocate in the opposite direction can the seamless switching between the vacuum pumping state and the oil injection state be realized. The operation is simple, and the vacuum pumping effect will not be affected during the switching process, thus avoiding the problem that the presence of air in the oil brake affects the braking effect and the braking feel.

[0039] In other embodiments, the second state switching device 50 may also include a first piston 31 and a first seal 33. At this time, an oil outlet hole 105 and a pressure relief hole 107 are provided on the oil injection main body 10, and the connection channel 113 is the oil outlet hole 105, which is used to connect with the oil brake. The pressure relief hole 107 communicates with one of the first channel spaces 331. The first piston 31 can reciprocate in the first piston channel 111 to connect the oil outlet hole 105 with the first channel space 331 far from the pressure relief hole 107 or connect the oil outlet hole 105 with the pressure relief hole 107 through another first channel space 331, so as to realize the switching of the operating state of the oil injection device 1 between the oil injection state and the pressure relief state.

[0040] In other embodiments, the first piston 31 may not be provided with the first seal 33. For example, the first piston 31 may be generally set in an "H" shape, and the two ends are used to selectively seal the vacuum pumping hole 103 or the oil injection hole 101, and a channel space connecting the vacuum pumping hole 103 and the connection channel 113 or connecting the oil injection hole 101 and the connection channel is formed between the two ends.

[0041] The specific type of the first seal 33 is not limited. In this application, the first seal 33 includes a first connecting portion 333 and a first sealing portion 335. The first connecting portion 333 is sleeved outside the first piston 31, and the first sealing portion 335 surrounds the edge of the first connecting portion 333. The first sealing portion 335 has elasticity and extends obliquely outward from the first connecting portion 333 toward the oil injection hole 101. In the vacuum pumping state and the oil injection state, the pressure in the first channel space 331 communicating with the oil injection hole 101 is greater than the pressure in the first channel space 331 communicating with the vacuum pumping hole 103. Under the action of the pressure difference, the first sealing portion 335 will deform outward, so as to be hermetically attached to the inner wall of the first piston channel 111, forming a one-way sealing effect, that is, the sealing effect can be formed only when the pressure in the first channel space 331 communicating with the oil injection hole 101 is greater than the pressure in the first channel space 331 communicating with the vacuum pumping hole 103. Since the first sealing portion 335 has elasticity and can deform, when the first piston 31 drives the first seal 33 across the connection channel 113, the first sealing portion 335 of the first seal 33 can deform, thereby reducing the risk that the first sealing portion 335 is scratched by the edge of the connection channel 113 and affecting the sealing effect of the first seal 33.

[0042] Please refer to Figure 2 and Figure 5, in some embodiments, second seals 35 are sleeved at both ends of the first piston 31 respectively, and the second seals 35 are in sealing fit with the inner wall of the first piston passage 111. The oil injection hole 101, the vacuum pumping hole 103, the connection passage 113 and the first seal 33 are all located between the two second seals 35, and the two first passage spaces 331 are located between the two second seals 35 and the first seal 33, that is, a first passage space 331 is formed between each second seal 35 and the first seal 33. By arranging the second seals 35 at both ends of the first piston 31, it is avoided that the first passage space 331 communicates with the part outside the end of the first piston 31, thereby preventing a gap from existing between the end of the first piston 31 and the inner wall of the first piston passage 111 and affecting the vacuum pumping and oil injection operations of the oil injection device 1.

[0043] The specific type of the second seal 35 is not limited. In this application, the second seal 35 is an O-ring. When the first piston 31 slides in the first piston passage 111, the second seal 35 will not cross the vacuum pumping hole 103 or the oil injection hole 101, and there is no need to worry that the edges of the vacuum pumping hole 103 and the oil injection hole 101 will damage the second seal 35. Therefore, on the premise of ensuring the quality of the oil injection device 1, using an O-ring with a relatively low use cost can reduce the production cost of the oil injection device 1.

[0044] Please refer to Figure 3 , Figure 4 and Figure 6 , in this application, the flow passage 11 includes a second piston passage 115. The first piston passage 111 and the second piston passage 115 are spaced apart from each other and are connected through the connection passage 113. The second state switching device 50 is arranged in the second piston passage 115. The second state switching device 50 includes a second piston 51 movably installed in the second piston passage 115. The oil injection main body 10 is provided with an oil outlet hole 105 and a pressure relief hole 107. The oil outlet hole 105 and the pressure relief hole 107 are spaced apart from each other, and both the oil outlet hole 105 and the pressure relief hole 107 communicate the second piston passage 115 with the outside. The second piston 51 can reciprocate in the second piston passage 115 to make the oil outlet hole 105 communicate with the connection passage 113 (i.e., communicate with the connection passage 113 through the second piston passage 115) or make the oil outlet hole 105 communicate with the pressure relief hole 107 (i.e., communicate with the pressure relief hole 107 through the second piston passage 115), so as to realize switching the operating state of the oil injection device 1 between the oil injection state and the pressure relief state. The oil injection device 1 only needs to drive the second piston 51 to reciprocate in the second piston passage 115, and the oil injection device 1 can be switched between the oil injection state and the pressure relief state, and the operation is simple.

[0045] Understandably, the positions of the oil outlet hole 105 and the pressure relief hole 107 are not limited. For example, they can be on the same side of the oil injection main body 10 or on different sides. In this application, the oil outlet hole 105 is located between the connection channel 113 and the pressure relief hole 107. The oil outlet hole 105 is located on the side of the second piston channel 115 away from the first piston channel 111, and the pressure relief hole 107 is located at one end of the second piston channel 115.

[0046] A third seal 53 is provided on the second piston 51. The third seal 53 is located between the connection channel 113 and the pressure relief channel. The third seal 53 divides the second piston channel 115 into two second channel spaces 531 on both sides of the third seal 53. One of the channel spaces communicates with the connection channel 113, and the other second channel space 531 communicates with the pressure relief hole 107. The second piston 51 can reciprocate in the second piston channel 115 to drive the third seal 53 to cross over the oil outlet hole 105, so that the oil outlet hole 105 can be switched between communicating with one of the second channel spaces 531 and communicating with the other channel space. When the third seal 53 crosses over the oil outlet hole 105 from the connection channel 113 to the direction of the pressure relief hole 107, the oil outlet hole 105 communicates with the connection channel 113 through the second channel space 531 on the side of the third seal 53 close to the connection channel 113; when the third seal 53 crosses over the connection channel 113 in the opposite direction, the oil outlet hole 105 communicates with the pressure relief hole 107 through the second channel space 531 on the side of the third seal 53 close to the pressure relief hole 107.

[0047] Specifically, when the oil injection device 1 is in a vacuum state, the vacuum hole 103 communicates with the connection channel 113 through a corresponding first channel space 331, and the connection channel 113 communicates with the oil outlet hole 105 through a corresponding second channel space 531, achieving the effect of communicating the vacuum hole 103 and the oil outlet hole 105, so as to perform a vacuum operation on the oil brake connected to the oil outlet hole 105 through the vacuum hole 103. When the oil injection device 1 is in an oil injection state, the oil injection hole 101 communicates with the connection channel 113 through another first channel space 331, and the connection channel 113 communicates with the oil outlet hole 105 through this second channel space 531, achieving the effect of communicating the oil injection hole 101 and the oil outlet hole 105, so as to inject oil into the oil brake connected to the oil outlet hole 105 through the oil injection hole 101. When the oil injection device 1 is in a pressure relief state, the oil injection hole 101 communicates with the connection channel 113 through this another first channel space 331, and the oil outlet hole 105 communicates with the pressure relief hole 107 through another second channel space 531, so that the oil brake connected to the oil outlet hole 105 can spray part of the oil inside it into this another second channel space 531 to release the pressure of the oil in the oil brake.

[0048] The specific type and specific quantity of the third seal 53 are not limited. In this application, there are two third seals 53. Each third seal 53 includes a second connecting portion 533 sleeved outside the second piston 51 and a second sealing portion 535 surrounding the edge of the second connecting portion 533. The second sealing portion 535 is elastic. The two second sealing portions 535 extend outwardly obliquely in opposite directions. That is, the second sealing portion 535 of one third seal 53 extends outwardly obliquely towards the connecting channel 113, and the second sealing portion 535 of the other third seal 53 extends outwardly obliquely towards the pressure relief hole 107. The second sealing portion 535 is elastic and can deform. Therefore, when the pressures on both sides of the third seal 53 are different, the second sealing portion 535 can deform, so as to be hermetically fitted with or separated from the inner wall of the second piston channel 115. Moreover, there are two third seals 53, and the second sealing portions 535 of the two third seals 53 extend outwardly obliquely in opposite directions. Therefore, no matter which channel space has a greater pressure in the two second channel spaces 531, one of the two third seals 53 can play a sealing role, thus forming a double-directional sealing effect. Since the second sealing portion 535 is elastic, when the second piston 51 drives the third seal 53 across the oil outlet hole 105, the second sealing portion 535 can deform, thereby reducing the risk that the edge of the oil outlet hole 105 scratches the second sealing portion 535 and affects the sealing effect of the third seal 53.

[0049] A fourth seal 55 is provided at one end of the second piston 51 away from the pressure relief hole 107. The fourth seal 55 is hermetically fitted with the inner wall of the second piston channel 115. One connecting channel 113 is located between the fourth seal 55 and the third seal 53, and the other connecting channel 113 is located between the third seal 53 and the pressure relief hole 107. By providing the fourth seal 55 at one end of the second piston 51 away from the pressure relief hole 107, it is possible to prevent risks between one end of the second piston 51 away from the pressure relief hole 107 and the inner wall of the second piston channel 115 from affecting the vacuum pumping and oil injection operations of the oil injection device 1.

[0050] The specific type of the fourth seal 55 is not limited. In this application, the fourth seal 55 is a sealing ring. Since the fourth seal 55 will not cross the connecting channel 113 during the movement following the second piston 51, there is no need to worry about the problem of being scratched by the edge of the connecting channel 113. Using a sealing ring can reduce the production cost of the oil injection device 1.

[0051] A connecting member 70 is provided at the oil outlet hole 105. The connecting member 70 is partially inserted into the oil outlet hole 105 and is hermetically connected to the oil outlet hole 105, and part of it protrudes outside the oil outlet hole 105 for connection with the oil brake. A through hole is provided through the connecting member 70, and the through hole is communicated with the oil outlet hole 105 for air and oil to pass through.

[0052] The oil injection device 1 further includes a recovery device (not shown in the figure), and the recovery device is communicated with the pressure relief hole 107. During the pressure relief process of the oil in the oil brake, some oil will be ejected into the second channel space 531 on the side close to the pressure relief hole 107, and the second channel space 531 is communicated with the pressure relief hole 107. Therefore, the oil in the second channel space 531 can flow into the recovery device through the pressure relief hole 107, thus achieving the effect of recovering the oil and preventing waste.

[0053] Please refer to Figure 2 and Figure 7 As shown in, the oil injection main body 10 includes a main body portion 13 and two side portions 15, and the two side portions 15 are respectively connected to opposite sides of the main body portion 13. The flow channel 11, the vacuum pumping hole 103, the oil injection hole 101, and the oil outlet hole 105 are all arranged on the main body portion 13. Avoidance holes 151 are provided corresponding to the first piston channel 111 and the second piston channel 115 through at least one side portion 15, and the pressure relief hole 107 is arranged through the side portion 15. Specifically, the first piston channel 111 and the second piston channel 115 penetrate through opposite sides of the main body portion 13 and are parallel and spaced apart vertically. The oil injection hole 101 and the vacuum pumping hole 103 are arranged on the side of the main body portion 13 away from the second piston channel 115, and the oil outlet hole 105 is arranged on the side of the main body portion 13 away from the first piston channel 111. Two avoidance holes 151 are provided on one side portion 15, and one avoidance hole 151 and one pressure relief hole 107 are provided on the other side portion 15. Both ends of the first piston channel 111 are communicated with the outside through the two avoidance holes 151 on the two side portions 15 respectively, one end of the second piston channel 115 is communicated with the outside through the avoidance hole 151 on one side portion 15, and the other end is communicated with the outside through the pressure relief hole 107 on the other side portion 15, so that the first piston 31 and the second piston 51 can reciprocate in the first piston channel 111 and the second piston channel 115 respectively. By dividing the oil injection main body 10 into three parts, the arrangement of structures such as the flow channel 11, the oil injection hole 101, the vacuum pumping hole 103, the oil outlet hole 105, the pressure relief hole 107, and the avoidance hole 151 can be facilitated.

[0054] The oil injection device 1 includes two drivers (not shown in the figure). One driver is connected to the first piston 31 to drive the first piston 31 to reciprocate in the first piston channel 111 to switch the operating state of the oil injection device 1 between the vacuum pumping state and the oil injection state. The other driver is connected to the second piston 51 to drive the second piston 51 to reciprocate in the second piston channel 115 to switch the operating state of the oil injection device 1 between the oil injection state and the pressure relief state.

[0055] The specific type of the driver is not limited. For example, it can be a cylinder, an oil cylinder or a motor. In this application, the driver is a cylinder. The two drivers are respectively located on the opposite sides of the oil injection main body 10 to avoid mutual influence between the two drivers. The piston rod of one cylinder passes through an avoidance hole 151 and extends into the first piston channel 111, and is connected to the first piston 31 to drive the first piston 31 to reciprocate in the first piston channel 111. One end of the other cylinder passes through a corresponding avoidance hole 151 and extends into the second piston channel 115, and is connected to the second piston 51 to drive the second piston 51 to reciprocate in the second piston channel 115.

[0056] For the oil injection device of the present invention, only by driving the first piston to reciprocate in the first piston channel, the oil injection device can be seamlessly switched between the vacuum pumping state and the oil injection state. By driving the second piston to reciprocate in the second piston channel, the oil injection device can be seamlessly switched between the oil injection state and the pressure relief state. Only by driving one piston can the oil injection device be switched between two corresponding operating states. The operation is simple, and the vacuum pumping effect will not be affected when the oil injection device is switched from the vacuum pumping state to the oil injection state, thus avoiding the presence of air in the oil brake and affecting the braking effect and braking feel.

[0057] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of protection required by the present invention.

Claims

1. An oil injection device for an oil brake, the oil injection device being selectively operable in a vacuum state, an oil injection state, and a pressure relief state, the oil injection device comprising: An oil injection main body provided with a flow channel; A first state switching device cooperating with the flow channel, the first state switching device being configured to switch the operating state of the oil injection device between the vacuum state and the oil injection state; And A second state switching device cooperating with the flow channel, the second state switching device being configured to switch the operating state of the oil injection device between the oil injection state and the pressure relief state; Characterized in that at least one of the first state switching device and the second state switching device includes a first piston, the first piston being movably installed in the flow channel, and the first piston being capable of reciprocating in the flow channel so that at least one of the first state switching device and the second state switching device realizes the corresponding switching of the operating state of the oil injection device; The flow channel includes a first piston channel and a connection channel communicating with the first piston channel. The first state switching device includes the first piston, and the first piston is movably installed in the first piston channel. An oil injection hole and a vacuum hole are provided on the oil injection main body. The oil injection hole and the vacuum hole are arranged at intervals along the movement direction of the first piston and are respectively communicated with the first piston channel. One end of the connection channel communicating with the first piston channel is located between the oil injection hole and the vacuum hole. The first piston is capable of reciprocating in the first piston channel to communicate the vacuum hole with the connection channel or to communicate the oil injection hole with the connection channel, so as to switch the operating state of the oil injection device between the vacuum state and the oil injection state.

2. The oil filling device for an oil brake according to claim 1, characterized in that, A first sealing member is provided on the first piston. The first sealing member divides the first piston channel into two first channel spaces on both sides of the first sealing member. The oil injection hole and the vacuum hole are respectively located on opposite sides of the first sealing member and are respectively communicated with the corresponding first channel spaces. The first piston is capable of reciprocating in the first piston channel to drive the first sealing member to cross the connection channel, so that the connection channel switches between communicating with one of the first channel spaces and communicating with the other first channel space.

3. The oil filling device for an oil brake according to claim 2, characterized in that, The first sealing member includes a first connecting portion sleeved outside the first piston and a first sealing portion surrounding the edge of the first connecting portion. The first sealing portion has elasticity, and the first sealing portion extends obliquely outward from the first connecting portion toward the oil injection hole; and / or Second sealing members that are hermetically fitted to the inner wall of the first piston channel are respectively sleeved on both ends of the first piston. The oil injection hole, the vacuum hole, and the first sealing member are all located between the two second sealing members, and the two first channel spaces are located between the two second sealing members and the first sealing member.

4. The oil injection device for an oil brake according to claim 2, characterized in that, The flow channel includes a second piston channel spaced from the first piston channel. The first piston channel and the second piston channel are communicated through the connection channel. The second state switching device includes a second piston movably installed in the second piston channel. The oil injection main body is provided with an oil outlet hole and a pressure relief hole communicated with the second piston. The second piston can reciprocate in the second piston channel to communicate the oil outlet hole with the connection channel or to communicate the oil outlet hole with the pressure relief hole, so as to switch the operating state of the oil injection device between the oil injection state and the pressure relief state.

5. The oil filling device for an oil brake according to claim 4, characterized in that, A third seal is provided on the second piston. The third seal is located between the connection channel and the pressure relief hole. The third seal divides the second piston channel into two second channel spaces on both sides of the third seal. One of the second channel spaces is communicated with the connection channel, and the other second channel space is communicated with the pressure relief hole. The second piston can reciprocate in the second piston channel to drive the third seal to cross the oil outlet hole, so that the oil outlet hole switches between communicating with one of the second channel spaces and communicating with the other second channel space.

6. The oil injection device for an oil brake according to claim 5, characterized in that, There are two third seals. Each third seal includes a second connecting portion sleeved outside the second piston and a second sealing portion surrounding the edge of the second connecting portion. The second sealing portion has elasticity, and the two second sealing portions extend obliquely outward in opposite directions.

7. The oil filling device for an oil brake according to claim 5, characterized in that, A fourth seal is provided at one end of the second piston away from the pressure relief hole. The fourth seal is in sealing fit with the inner wall of the second piston channel. One connection channel is located between the fourth seal and the third seal.

8. The oil injection device for an oil brake according to claim 4, characterized in that, The oil injection device includes a recovery device communicated with the pressure relief hole.

9. The oil filling device for an oil brake according to claim 4, characterized in that, The oil injection main body includes a main body portion and two side portions respectively located on opposite sides of the main body portion. The flow channel, the vacuum pumping hole, the oil injection hole and the oil outlet hole are all provided in the main body portion. At least one side portion is provided with avoidance holes corresponding to the first piston channel and the second piston channel penetrating therethrough, and the pressure relief hole penetrates through the side portion.

10. The oil filling device for an oil brake according to claim 4, characterized in that, The oil injection device includes two drivers. One of the drivers is connected to the first piston to drive the first piston to reciprocate in the first piston channel, and the other driver is connected to the second piston to drive the second piston to reciprocate in the second piston channel.

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