A hydraulic wheel hub

Abstract

The present application discloses a hydraulic wheel hub, comprising: a sleeve, on which a hydraulic cavity is provided, in which a pressure medium is injected; the sleeve is sleeved on a rotating shaft; a pressure relief valve, which is fixedly connected to the sleeve and communicates with the hydraulic cavity; the pressure relief valve extends a pressure rod in the axial direction of the rotating shaft, and the pressure rod can move axially to open the pressure relief valve; an end cover, on which a slide groove is provided on the axial side of the sleeve, and the slide groove is used to accommodate the end of the pressure rod, and the end cover is fixedly connected to the rotating shaft; when the sleeve and the rotating shaft slide relative to each other in the circumferential direction, the end of the pressure rod slides out of the slide groove, the pressure relief valve opens, and the pressure medium in the hydraulic cavity is released. The beneficial effect of the present application is that after the pressure medium in the hydraulic cavity is released, no parts need to be replaced, which is safe and reliable and can improve work efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of couplings, and in particular to a hydraulic hub. Background Art

[0002] Traditional couplings mainly rely on various key connections to transmit torque. For equipment that transmits relatively large torque, the keyway on the shaft will seriously weaken the strength, rigidity and load-bearing capacity of the shaft. Increasing the radius of the shaft blindly will increase the size of the entire equipment, making the equipment large and heavy, and increase production costs on the other hand. In addition, simply increasing the radial size of the shaft cannot achieve the desired effect. In addition, large couplings are required to be able to operate stably for a long time during operation. In order to ensure the concentricity of the two connected shafts and avoid vibration, large couplings and shafts are generally overfitted or interference fit. The installation and disassembly of such couplings is relatively difficult. For smaller couplings, the coupling and shaft can be assembled by mechanical knocking or pushing, but the inner wall of the coupling sleeve and the shaft are often damaged during the assembly process, and large couplings cannot be assembled by mechanical knocking at all.

[0003] The emergence of hydraulic couplings solves these problems. By injecting hydraulic medium into a sleeve with a sandwich layer, and then squeezing the medium with a screw / piston or an external working pump, the pressure can be dispersed and evenly transmitted to the contact surface of the shaft and the hub (or other parts connected to the shaft). The sleeve with a sandwich layer expands evenly around the shaft, thereby generating a balanced contact pressure. Compared with the general traditional key-connected coupling, the hydraulic coupling has a more compact structure, is faster to install and disassemble, is easier to position, does not damage the joint surface, and is easier to disassemble and assemble.

[0004] However, since the hub and the mounting shaft of the hydraulic coupling are connected keylessly, the torque is transmitted by the friction between the mating surfaces. When an abnormal operating condition occurs in the transmission system, the system is overloaded, and the coupling and the shaft cannot be disconnected in time. Relative sliding will occur between the mating surfaces of the coupling hub and the mounting shaft, which may easily cause damage to the inner hole of the hub and the transmission system. The existing technology solves the problem of the above-mentioned hydraulic coupling by installing a shear valve connected to the hydraulic medium on the hub. When the hub and the mounting shaft slide relative to each other, the shear valve is sheared off, the hydraulic medium in the hub is released, and a gap appears between the inner hole of the hub and the mounting shaft. Although this solution solves the risk of damage to the hub and the mounting shaft, the shear valve needs to be replaced after it is sheared off, which has low work efficiency and high requirements on personnel. Summary of the invention

[0005] The object of the present application is to provide a hydraulic hub to overcome or at least alleviate at least one of the above-mentioned defects of the prior art.

[0006] To achieve the above objectives, the present application provides a hydraulic hub, comprising:

[0007] A shaft sleeve, wherein a hydraulic cavity is provided on the shaft sleeve, and the hydraulic cavity is used to inject a pressure medium; the shaft sleeve is sleeved on the rotating shaft;

[0008] A pressure relief valve, the pressure relief valve is fixedly connected to the shaft sleeve and communicated with the hydraulic cavity; the pressure relief valve extends a pressure rod in the axial direction of the rotating shaft, and the pressure rod can move axially to open the pressure relief valve;

[0009] An end cover, wherein a slide groove is provided on the axial side of the end cover close to the shaft sleeve, the slide groove is used to accommodate the end of the pressure rod, and the end cover is fixedly connected to the rotating shaft;

[0010] When the shaft sleeve and the rotating shaft slide relative to each other in the circumferential direction, the end of the pressure rod slides out of the sliding groove, the pressure relief valve opens, and the pressure medium in the hydraulic chamber is released.

[0011] Preferably, the pressure relief valve comprises:

[0012] A valve body, wherein the valve body is fixedly connected to the shaft sleeve in a detachable manner, an axial through hole is provided at the center of the valve body, and a one-way valve structure is provided at one end of the axial through hole;

[0013] The pressure rod is arranged at the other end of the axial through hole, and one end of the pressure rod extends out of the axial end surface of the valve body, and the other end is used to open the one-way valve structure when the pressure rod moves.

[0014] Preferably, the axial through hole comprises three sections, one of which is set as a threaded hole at the end, and the other two sections are set as light holes, and the diameter of the light hole in the middle section is larger than the diameter of the light hole in the other sections, and the two sections of light holes are connected by a tapered surface transition;

[0015] The pressure relief valve also includes a compression spring, a screw plug and a sealing body;

[0016] The screw plug is installed at the threaded hole, and a through hole is provided at the center of the screw plug;

[0017] The sealing body is arranged in the light hole in the middle section and contacts the conical surface, and is used to seal the axial through hole in the center of the valve body;

[0018] One end of the compression spring presses against the sealing body, and the other end presses against the end surface of the screw plug;

[0019] When the pressure rod moves axially, it applies pressure to the sealing body to overcome the force of the compression spring, so that the axial through hole in the center of the valve body turns from a closed state to an open state.

[0020] Preferably, the sealing body is a steel ball.

[0021] Preferably: the valve body is fixedly connected to the shaft sleeve by threads; an even number of blind holes are evenly distributed on the circumference of the end surface of the valve body, and the blind holes are used to insert installation tools to tighten the valve body.

[0022] Preferably, the pressure rod is provided with a ball head at one end extending out of the valve body, and the ball head is placed in a slide groove on the end cover.

[0023] Preferably, a plurality of pressure relief valves are evenly distributed in the circumferential direction of the shaft sleeve.

[0024] Preferably, the slide groove is configured as an arc-shaped slide groove, the axis of the arc-shaped slide groove coincides with the axis of the end cover, and the axial depth of the arc-shaped slide groove decreases from the middle to both ends in the circumferential direction.

[0025] Preferably, the shaft sleeve is provided with a connecting flange at one end away from the end cover, and the connecting flange is used to be connected to another wheel hub to form a coupling.

[0026] Preferably, a shaft rolling bearing is installed between the shaft sleeve and the rotating shaft.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] The hydraulic hub of the present application is provided with a hydraulic valve, and a pressure rod is provided on the pressure relief valve. One end of the pressure rod is arranged in a slide groove on the end cover. The hydraulic sleeve is installed on the rotating shaft for transmitting torque, and the end cover is fixedly connected to the rotating shaft. When the hydraulic hub is overloaded, the sleeve and the rotating shaft rotate relative to each other in the circumferential direction, and the pressure rod slides out of the slide groove and moves axially, thereby opening the pressure relief valve to release the pressure medium in the sleeve. A gap appears between the sleeve and the rotating shaft, which can effectively prevent wear between the sleeve and the rotating shaft caused by relative sliding.

[0029] In addition, after the hydraulic hub of the present application is depressurized, no parts need to be replaced. The hub only needs to be rotated to allow the pressure rod to re-enter the slide groove on the end cover, and the pressure relief valve will return to the closed state. At this time, the pressure medium can be injected again to lock the shaft sleeve and the rotating shaft. Compared with the safety shear valve structure in the existing structure, the pressure in the shaft sleeve can only be released after the shear valve is cut off, and after the pressure is released, the shear valve needs to be replaced again; the technical solution provided by the present application has the advantages of high work efficiency and low technical requirements for the staff.

[0030] Third, the hydraulic hub provided by the present application releases the pressure medium in the sleeve in an axial direction, which is safe and reliable. However, the prior art discharges the pressure medium in a radial direction, which poses certain safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a hydraulic hub provided in one embodiment of the present application.

[0032] Figure 2 yes Figure 1 A schematic structural diagram of the pressure relief valve of the hydraulic wheel hub.

[0033] Figure 3 yes Figure 1 A schematic structural diagram of the end cover of the hydraulic hub.

[0034] Figure 4 yes Figure 1 A schematic diagram of the end cover of the hydraulic hub in another direction.

[0035] Figure 5 yes Figure 4 Schematic diagram of the BB cross section.

[0036] Figure 6 yes Figure 4 AA section diagram in .

[0037] Among them, 1-shaft sleeve; 12-connecting flange; 2-pressure relief valve; 21-pressure rod; 22-valve body; 23-compression spring; 24-screw plug; 25-sealing body; 3-end cover; 31-slide groove. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0040] See also Figures 1 to 6 A hydraulic wheel hub comprises a shaft sleeve 1, a pressure relief valve 2 and an end cover 3.

[0041] The sleeve 1 includes an outer sleeve and an inner sleeve. The radial thickness of the outer sleeve is greater than that of the inner sleeve. The inner hole of the outer sleeve cooperates with the outer circle of the inner sleeve to form a hydraulic cavity 11. An oil inlet nozzle and an oil drain nozzle are provided on the outer sleeve. The oil inlet nozzle and the oil drain nozzle are respectively connected to the hydraulic cavity 11. The oil inlet nozzle is used to inject pressure medium into the hydraulic cavity 11; the oil drain nozzle is used to release the pressure medium in the hydraulic cavity 11 when the wheel hub is disassembled. The sleeve 1 is sleeved on the rotating shaft. When the pressure medium is injected into the hydraulic cavity 11 through an external pump, the inner sleeve shrinks and deforms to lock the sleeve and the rotating shaft. It can be understood that the pressure medium can be thin oil, such as hydraulic oil, or glycerin, such as grease. When the sleeve is used for a rotating shaft rotating at a low speed, the pressure medium can be grease. The advantage is that the grease has poor fluidity and is more conducive to sealing. When the sleeve is used for a rotating shaft rotating at high speed, the pressure medium can be thin oil. The advantage is that thin oil has good fluidity. When the hydraulic oil in the hydraulic cavity 11 needs to be released, it can be released instantly in a short time, reducing the wear of the sleeve and the rotating shaft to a minimum.

[0042] The pressure relief valve 2 is fixedly connected to the shaft sleeve 1 and communicated with the hydraulic cavity 11; the pressure relief valve 2 extends a pressure rod 21 in the axial direction of the rotating shaft, and the pressure rod 21 can move axially to open the pressure relief valve 2. In this embodiment, the pressure relief valve 2 is fixedly connected to the shaft sleeve 1 by threads, and an axial threaded hole is provided on the outer sleeve of the shaft sleeve 1, and the threaded hole is communicated with the hydraulic cavity 11; the pressure relief valve 2 is provided with an external thread, and the pressure relief valve 2 is provided with a sealing end face, and a sealing gasket is provided between the sealing end face and the shaft sleeve 1, and the sealing gasket is used to seal the connecting thread between the pressure relief valve 2 and the shaft sleeve to prevent the pressure medium in the hydraulic cavity 11 from leaking from the connecting thread. In this embodiment, the sealing gasket is a copper gasket.

[0043] It is understandable that the pressure relief valve 2 can also be fixedly connected to the sleeve 1 by screws. For example, in an alternative embodiment, a mounting flange is provided at one end of the pressure relief valve 2, and a mounting countersunk hole of the flange is provided on the corresponding sleeve 1, a screw hole is provided on the mounting flange of the pressure relief valve for the screw to pass through, and a threaded blind hole is provided at a corresponding position on the sleeve 1 for installing the screw; similarly, with this structure, a sealing gasket is also provided between the mounting flange of the pressure relief valve 2 and the axial mating surface of the sleeve 1.

[0044] The end cover 3 is provided with a slide groove 31 on the axial side surface close to the sleeve 1, and the slide groove 31 is used to accommodate the end of the pressure rod 21, and the end cover 3 is fixedly connected to the rotating shaft; when the rotating shaft has a keyway, the end cover 3 and the rotating shaft can be connected by a key; when the rotating shaft is an optical axis, the end cover 3 can be provided with a positioning screw in the radial direction, and the fixed connection between the end cover 3 and the rotating shaft is achieved by the positioning screw.

[0045] When the hydraulic hub is in normal working condition, the pressure relief valve 2 is in a normally closed state, and the hydraulic hub can transmit torque normally. When overload or impact occurs, if the overload force or impact force exceeds the hydraulic locking force between the sleeve 1 and the rotating shaft, the sleeve 1 and the rotating shaft will slide relative to each other in the circumferential direction. At this time, the end of the pressure rod 21 slides out of the slide groove 31, the pressure rod 21 moves axially, the pressure relief valve 2 is opened, and the pressure medium in the hydraulic cavity 11 is released.

[0046] The advantage of the present application is that when the hydraulic wheel hub is in overload protection, there is no damaged part on the hydraulic wheel hub, so there is no need for disassembly and replacement, no wearing parts, and no need for spare parts inventory. When the hydraulic wheel hub needs to resume the function of transmitting torque again, it is only necessary to rotate the hydraulic wheel hub so that the end of the pressure rod 21 is inserted into the slide groove again to close the pressure relief valve 2. At this time, the pressure medium can be injected into the hydraulic cavity 11 again through the oil inlet nozzle to lock the rotating shaft so that the hydraulic wheel hub can resume transmitting torque.

[0047] In this embodiment, an axial through hole is provided at the center of the valve body 22, and a one-way valve structure is provided at one end of the axial through hole; a pressure rod 21 is provided at the other end of the axial through hole, and one end of the pressure rod extends out of the axial end surface of the valve body 22, and the other end is used to open the one-way valve structure when the pressure rod 21 moves. It can be understood that one end and the other end of the axial through hole are not limited to the end, but are relative.

[0048] The axial through hole comprises three sections, one of which is set as a threaded hole at the end, and the other two sections are set as light holes, that is, one end of the axial through hole is a threaded hole, the other end opposite to the threaded hole is a light hole, and the section in the middle is still a light hole, and the diameter of the light hole in the middle section is larger than the diameter of the light hole in the other sections, and the two sections of light holes are connected by a conical surface transition.

[0049] The pressure relief valve 2 further includes a compression spring 23 , a screw plug 24 and a sealing body 25 .

[0050] The screw plug 24 is installed at the threaded hole, and a through hole is provided at the center of the screw plug for allowing the pressure medium in the hydraulic chamber 11 to pass through.

[0051] The sealing body 25 is arranged in the light hole in the middle section and contacts the conical surface to seal the axial through hole in the center of the valve body. In this embodiment, the sealing body 25 is set as a steel ball, and the steel ball cooperates with the conical surface to form a seal. It can be understood that the sealing body 25 can also be set as an outer cone, and the conical surface of the outer cone cooperates with the inner conical surface connecting the two sections of the light hole to form a conical surface seal.

[0052] One end of the compression spring 23 presses against the sealing body 25, and the other end presses against the end face of the screw plug 24; in the initial state, the compression spring is compressed, and the spring force presses the steel ball against the inner conical surface to form a seal; when the pressure rod 21 is compressed, it moves to the right, and the compression spring is further compressed by the steel ball. At this time, the steel ball separates from the inner conical surface, and the pressure medium in the hydraulic cavity 11 can flow out through the central through hole of the pressure relief valve. It can be understood that the attached Figure 2 The installation of the middle pressure rod 21 and the valve body 22 is only a schematic diagram of the structure. In fact, the cooperation between the pressure rod 21 and the valve body 22 is a large clearance cooperation, the purpose of which is to allow the pressure medium to flow smoothly. Alternatively, multiple flow channels are set along the axial surface of the pressure rod 21 or the light hole section of the valve body 22 where the pressure rod 21 is installed, so as to facilitate the outflow of the pressure medium in the hydraulic cavity 11; or, an axial through hole can also be set in the center of the pressure rod 21. In this embodiment, the compression spring 23 is a cylindrical compression spring. It can be understood that the compression spring can also be a disc spring.

[0053] When the pressure rod 21 moves axially, it applies pressure to the sealing body 25 to overcome the force of the compression spring, so that the axial through hole in the center of the valve body turns from a closed state to an open state.

[0054] In this embodiment, an even number of blind holes 221 are evenly distributed on the circumference of the end surface of the valve body 22, and the blind holes 221 are used to insert the installation tool to tighten the valve body. The advantage is that the radial dimension of the valve body 22 can be reduced, thereby reducing the thickness requirement of the outer sleeve, so as to meet the requirements of multiple apertures of the same model under fixed external dimensions, making the sleeve more universal.

[0055] In this embodiment, the end of the pressure rod 21 extending out of the valve body 22 is provided with a ball head, and the ball head is placed in the slide groove on the end cover. The advantage is that the ball head is more conducive to smooth sliding in the slide groove 31.

[0056] There are multiple pressure relief valves 2 evenly distributed in the circumferential direction of the sleeve 1, and correspondingly, there are multiple slide grooves 31 on the end cover 3, the purpose of which is to release the pressure medium in the hydraulic cavity 11 in a short time and to ensure that the mating surface between the inner hole of the sleeve 1 and the mounting shaft is not worn to the greatest extent.

[0057] In this embodiment, if Figures 3 to 6, the slide groove 31 is set as an arc-shaped slide groove, and the axis of the arc-shaped slide groove coincides with the axis of the end cover ( Figure 4 ), the axial depth of the arc-shaped groove decreases from the middle to the two ends in the circumferential direction ( Figure 6 ), the depth of the arc-shaped chute in the radial direction of the arc decreases from the middle to both sides ( Figure 5 ).

[0058] It is understandable that the arc-shaped slide groove can also be set in other forms. For example, in an alternative embodiment, the width of the arc-shaped slide groove is greater than the diameter of the ball head at the end of the pressure rod, the axis of the arc-shaped slide groove is perpendicular to the axis of the end cover 3, and the length direction of the arc-shaped slide groove is perpendicular to the axial direction of the end cover 3, and the depth of the arc-shaped slide groove in the axial direction of the end cover 3 decreases uniformly from the middle to both sides.

[0059] The shaft sleeve 1 is provided with a connecting flange 12 at one end away from the end cover 3, and different structures can be provided on the connecting flange 12 as needed to be connected with another hub to form a coupling. For example, bolt connection holes, pin holes, teeth and other structures can be provided on the connecting flange to form a hub of a rigid coupling, a hub of an elastic pin coupling, a hub of an elastic sleeve pin coupling, a hub of an elastic pin gear coupling, a hub of a drum gear coupling, a hub of a serpentine spring coupling, a hub of a diaphragm coupling, a hub of a plum blossom coupling, etc., and the two hubs form two half hubs of a complete set of couplings.

[0060] It is understandable that when the rotating shaft mounted on the sleeve rotates at a high speed, the linear speed is greater than 5m / s, a shaft rolling bearing can be installed between the sleeve 1 and the rotating shaft, and the rolling bearing is arranged at both axial ends of the sleeve 1 to avoid wear between the inner hole of the sleeve 1 and the mounting shaft.

[0061] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydraulic wheel hub, characterized in that: Include: A shaft sleeve (1), wherein a hydraulic cavity (11) is provided on the shaft sleeve, and the hydraulic cavity (11) is used to inject a pressure medium; the shaft sleeve (1) is sleeved on a rotating shaft; A pressure relief valve (2), the pressure relief valve (2) being fixedly connected to the shaft sleeve (1) and communicating with the hydraulic chamber (11); the pressure relief valve has a pressure rod (21) extending axially from the rotating shaft, the pressure rod (21) being axially movable and used to open the pressure relief valve (2); An end cover (3), wherein a slide groove (31) is provided on the axial side of the end cover (3) close to the shaft sleeve (1), and the slide groove (31) is used to accommodate the end of the pressure rod (21), and the end cover (3) is fixedly connected to the rotating shaft; When the shaft sleeve (1) and the rotating shaft slide relative to each other in the circumferential direction, the end of the pressure rod (21) slides out of the slide groove (31), the pressure relief valve (2) opens, and the pressure medium in the hydraulic chamber (11) is released; The pressure relief valve (2) comprises: a valve body (22), the valve body (22) being fixedly connected to the shaft sleeve (1) in a detachable manner, an axial through hole being arranged at the center of the valve body (22), and a one-way valve structure being arranged at one end of the axial through hole; The pressure rod (21) is arranged at the other end of the axial through hole, and one end of the pressure rod extends out of the axial end surface of the valve body, and the other end is used to keep the one-way valve structure in an open state when the pressure rod moves; The axial through hole comprises three sections, one of which is set as a threaded hole at the end, and the other two sections are set as light holes, and the diameter of the light hole in the middle section is larger than the diameter of the light holes in the other sections, and the two sections of light holes are connected by a tapered surface transition; The pressure relief valve further comprises a compression spring (23), a screw plug (24) and a sealing body (25); The screw plug (24) is installed at the threaded hole, and a through hole is provided at the center of the screw plug; The sealing body (25) is arranged in the light hole in the middle section and contacts the conical surface, and is used to seal the axial through hole in the center of the valve body; One end of the compression spring (23) is pressed against the sealing body, and the other end is pressed against the end surface of the screw plug; When the pressure rod (21) moves axially, it applies pressure to the sealing body (25) to overcome the force of the compression spring, so that the axial through hole in the center of the valve body turns from a closed state to an open state.

2. The hydraulic hub according to claim 1, characterized in that: The sealing body is a steel ball.

3. The hydraulic hub according to claim 2, characterized in that: The valve body (22) is fixedly connected to the shaft sleeve (1) by means of threads; an even number of blind holes are evenly distributed around the circumference of the end surface of the valve body (22), and the blind holes are used to insert installation tools to tighten the valve body.

4. The hydraulic hub according to claim 3, characterized in that: The pressure rod (21) is provided with a ball head at one end extending out of the valve body, and the ball head is placed in a slide groove on the end cover.

5. The hydraulic hub according to claim 4, characterized in that: A plurality of pressure relief valves (2) are evenly distributed in the circumferential direction of the shaft sleeve (1).

6. The hydraulic hub according to claim 5, characterized in that: The slide groove (31) is configured as an arc-shaped slide groove, the axis of the arc-shaped slide groove coincides with the axis of the end cover, and the axial depth of the arc-shaped slide groove decreases from the middle to both ends in the circumferential direction.

7. The hydraulic hub according to claim 6, characterized in that: The shaft sleeve (1) is provided with a connecting flange (12) at one end away from the end cover, and the connecting flange is used to be connected to another wheel hub to form a coupling.

8. The hydraulic hub according to claim 7, characterized in that: A shaft rolling bearing is installed between the shaft sleeve (1) and the rotating shaft.

Images