Hydraulic cavity structure for hydraulic device

Abstract

The utility model discloses a hydraulic cavity structure for a hydraulic device, which comprises a hydraulic cylinder body, a hydraulic cavity, a hydraulic oil cavity and a piston rod, the hydraulic cavity and the hydraulic oil cavity are arranged in the hydraulic cylinder body, and the piston rod is movably mounted in the hydraulic cavity. The oil pump drives hydraulic oil in the hydraulic oil cavity to flow into the hydraulic cavity through the oil way to push the piston rod to move. The hydraulic cavity comprises a small-size first hydraulic cavity and a large-size second hydraulic cavity; the first hydraulic cavity is formed in the piston rod and communicates with the hydraulic oil cavity through a first oil way, and the second hydraulic cavity is formed in the bottom of the piston rod and communicates with the hydraulic oil cavity through a second oil way. A flow adjusting ball and an unloading runner are arranged at the communication position of the first hydraulic cavity and the first oil way, the flow adjusting ball is arranged at an outlet of the first oil way and used for controlling connection and disconnection of the first oil way, the unloading runner is arranged on the inner side wall of the outlet of the first oil way, and the two ends of the unloading runner communicate with the first hydraulic cavity and the first oil way correspondingly.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic devices, and in particular to a hydraulic chamber structure for hydraulic devices. Background Technology

[0002] A hydraulic cylinder, typically consisting of a cylinder body, piston rod, and sealing device, is a hydraulic actuator that converts hydraulic energy into mechanical energy by pushing the piston rod through the input of hydraulic oil into the sealed cylinder body, thus performing linear reciprocating motion (or oscillating motion).

[0003] For example, patent document No. 201611219445.4 discloses a brake master cylinder of a braking system, a cylinder body defining a reservoir for storing brake fluid and a first hydraulic chamber that can communicate with or be disconnected from the reservoir; a connecting member disposed within the first hydraulic chamber and extending in a left-right direction, the connecting member having a connecting channel extending through its length in a left-right direction, the connecting channel communicating with the brake wheel cylinder; a piston having a groove extending in a left-right direction and open at its right end, the groove being fitted outside the connecting member and the piston being reciprocating in a left-right direction, wherein the connecting member and the groove together define a second hydraulic chamber, the second hydraulic chamber communicating with the connecting channel.

[0004] In the above technical solution, during the initial braking phase, the piston simultaneously pushes the brake fluid in the first hydraulic chamber and the second hydraulic chamber into the brake wheel cylinder, which can provide a large displacement of brake fluid to the brake wheel cylinder within a short stroke, thus meeting the braking system's requirements for brake fluid displacement.

[0005] However, because the volumes of the first hydraulic chamber and the second hydraulic chamber are different, when the smaller second hydraulic chamber is filled with hydraulic oil, there is space at the top of the first hydraulic chamber. This space will cause a sudden drop during unloading.

[0006] Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. Utility Model Content

[0007] The purpose of this invention is to provide a hydraulic chamber structure for a hydraulic device to solve the problems existing in the prior art.

[0008] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0009] A hydraulic chamber structure for a hydraulic device includes a hydraulic cylinder body, a hydraulic chamber and a hydraulic oil chamber disposed inside the hydraulic cylinder body, and a piston rod movably installed in the hydraulic chamber. The hydraulic oil chamber is connected to the hydraulic chamber through an oil passage, and an oil pump drives the hydraulic oil in the hydraulic oil chamber to flow through the oil passage into the hydraulic chamber to push the piston rod to move.

[0010] The hydraulic chamber includes a small-volume first hydraulic chamber and a large-volume second hydraulic chamber; the first hydraulic chamber is located inside the piston rod and is connected to the hydraulic oil chamber through a first oil passage; the second hydraulic chamber is located at the bottom of the piston rod and is connected to the hydraulic oil chamber through a second oil passage.

[0011] The connection between the first hydraulic chamber and the first oil circuit is provided with a flow regulating ball and an unloading flow channel. The flow regulating ball is located at the outlet of the first oil circuit and is used to control the opening and closing of the first oil circuit. The unloading flow channel is located on the inner side wall at the outlet of the first oil circuit, and its two ends are respectively connected to the first hydraulic chamber and the first oil circuit.

[0012] Furthermore, the hydraulic cylinder body is provided with an isolation plate inside, which divides the internal space of the hydraulic cylinder body into an inner cavity for the hydraulic chamber and an inner cavity for the hydraulic oil chamber.

[0013] Furthermore, the piston rod has an internal cavity structure, and the oil outlet at the top of the first oil passage is located inside the cavity structure of the piston rod. At the bottom of the first oil passage, there is a first steel ball for controlling the on / off state.

[0014] Furthermore, an opening groove is provided at the connection between the second hydraulic chamber and the second oil circuit, and a second steel ball for controlling the on / off state is provided in the opening groove.

[0015] In summary, this utility model has the following beneficial effects:

[0016] The piston rod can be pushed by quickly filling the small-volume first hydraulic chamber with an oil pump, thus enabling the hydraulic device to lift rapidly when unloaded. When unloading, the hydraulic oil in the first hydraulic chamber is slowly discharged through the small-diameter unloading channel, thereby preventing the piston rod from dropping suddenly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic chamber structure for a hydraulic device according to the present invention.

[0018] Figure 2 This is a schematic diagram of the working process of the hydraulic cavity structure described in this utility model.

[0019] Figure 3 This is a schematic diagram of the flow regulating ball and unloading channel described in this utility model. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with the illustrations and specific embodiments.

[0021] like Figures 1 to 3As shown, the present invention proposes a hydraulic cavity structure for a hydraulic device, including a hydraulic cylinder body 1, a hydraulic cavity 2 and a hydraulic oil cavity 3 disposed inside the hydraulic cylinder body 1, and a piston rod 4 movably installed in the hydraulic cavity 2. The hydraulic oil cavity 3 is connected to the hydraulic cavity 2 through an oil passage. An oil pump drives the hydraulic oil in the hydraulic oil cavity 3 to flow through the oil passage into the hydraulic cavity 2 to push the piston rod 4 to move.

[0022] The hydraulic chamber 2 includes a small-volume first hydraulic chamber 21 and a large-volume second hydraulic chamber 22; the first hydraulic chamber 21 is located inside the piston rod 4 and is connected to the hydraulic oil chamber 3 through the first oil passage 23; the second hydraulic chamber 22 is located at the bottom of the piston rod 4 and is connected to the hydraulic oil chamber 3 through the second oil passage 24.

[0023] The connection between the first hydraulic chamber 21 and the first oil circuit 23 is provided with a flow regulating ball 27 and an unloading flow channel 28. The flow regulating ball 27 is located at the outlet of the first oil circuit 23 and is used to control the opening and closing of the first oil circuit 23. The unloading flow channel 28 is located on the inner side wall at the outlet of the first oil circuit 23, and its two ends are respectively connected to the first hydraulic chamber 21 and the first oil circuit 23.

[0024] It should be noted that the purpose of setting the unloading flow channel 28 in this embodiment is to provide a small-sized flow channel so that the hydraulic oil in the first hydraulic chamber 21 can flow out slowly during unloading, thereby preventing the piston rod 4 from dropping suddenly during the slow outflow of hydraulic oil. Therefore, the unloading flow channel 28 in this embodiment includes, but is not limited to, small-sized notches, flow holes, or annular gaps. Those skilled in the art can set it according to actual needs, and this embodiment does not impose specific limitations here.

[0025] The hydraulic cylinder body 1 is provided with an isolation plate 11, which divides the internal space of the hydraulic cylinder body 1 into an inner cavity for the hydraulic chamber 2 and an inner cavity for the hydraulic oil chamber 3.

[0026] The piston rod 4 has an internal cavity structure. The oil outlet at the top of the first oil passage 23 is located inside the cavity structure of the piston rod 4. A first steel ball 25 for controlling the on / off state is provided at the bottom of the first oil passage 23.

[0027] An opening groove is provided at the connection between the second hydraulic chamber 22 and the second oil circuit 24, and a second steel ball 26 for controlling the on / off state is provided in the opening groove.

[0028] The working principle of this utility model is as follows:

[0029] During the no-load phase, that is, from the moment the piston rod 4 starts moving to contact the target, the first steel ball 25 is controlled to open the first oil passage 23, so that the hydraulic oil in the hydraulic oil chamber 3 enters the first oil passage 23. The hydraulic oil entering the first oil passage 23 will push open the flow regulating ball 27 at the top and enter the first hydraulic chamber 21. Since the first hydraulic chamber 21 has a small volume, it can be quickly filled in a short time, so that the piston rod 4 can be quickly pushed to complete the stroke of the no-load phase.

[0030] During the rapid movement of piston rod 4, the large-volume second hydraulic chamber 22 will generate negative pressure. The second steel ball 26 will move under the action of negative pressure, thereby opening the second oil passage 24, and the hydraulic oil enters the second hydraulic chamber 22 through the second oil passage 24.

[0031] During unloading, the flow regulating ball 27 will block the outlet of the first oil passage 23 under the action of gravity. Therefore, the hydraulic oil in the first hydraulic chamber 21 can only be slowly discharged through the small-diameter unloading channel 28. In the above process, the sudden drop of the piston rod 4 is prevented.

[0032] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", and "horizontal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of clarifying the technical solution and for the convenience of description, and therefore should not be construed as limiting the present utility model.

[0033] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hydraulic chamber structure for a hydraulic device, comprising a hydraulic cylinder body (1), a hydraulic chamber (2) and a hydraulic oil chamber (3) disposed inside the hydraulic cylinder body (1), and a piston rod (4) movably installed in the hydraulic chamber (2), wherein the hydraulic oil chamber (3) is connected to the hydraulic chamber (2) through an oil passage, and an oil pump drives the hydraulic oil in the hydraulic oil chamber (3) to flow through the oil passage into the hydraulic chamber (2) to push the piston rod (4) to move; Its features are, The hydraulic chamber (2) includes a small-volume first hydraulic chamber (21) and a large-volume second hydraulic chamber (22); the first hydraulic chamber (21) is located inside the piston rod (4) and is connected to the hydraulic oil chamber (3) through a first oil passage (23); the second hydraulic chamber (22) is located at the bottom of the piston rod (4) and is connected to the hydraulic oil chamber (3) through a second oil passage (24); A flow regulating ball (27) and an unloading flow channel (28) are provided at the connection between the first hydraulic chamber (21) and the first oil circuit (23). The flow regulating ball (27) is located at the outlet of the first oil circuit (23) and is used to control the opening and closing of the first oil circuit (23). The unloading flow channel (28) is located on the inner side wall at the outlet of the first oil circuit (23) and its two ends are connected to the first hydraulic chamber (21) and the first oil circuit (23) respectively.

2. The hydraulic chamber structure for a hydraulic device according to claim 1, characterized in that, The hydraulic cylinder body (1) is provided with an isolation plate (11), and the internal space of the hydraulic cylinder body (1) is divided into an inner cavity for the hydraulic chamber (2) and an inner cavity for the hydraulic oil chamber (3) by the isolation plate (11).

3. The hydraulic chamber structure for a hydraulic device according to claim 1, characterized in that, The piston rod (4) has a cavity structure inside. The oil outlet at the top of the first oil passage (23) is located inside the cavity structure of the piston rod (4). A first steel ball (25) for controlling the on / off state is provided at the bottom of the first oil passage (23).

4. The hydraulic chamber structure for a hydraulic device according to claim 1, characterized in that, An opening groove is provided at the connection between the second hydraulic chamber (22) and the second oil circuit (24), and a second steel ball (26) for controlling the on / off state is provided in the opening groove.

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