Hydraulic jack base and hydraulic jack with same

Abstract

The utility model provides a base of a hydraulic jack and the hydraulic jack comprising the base. The base of the hydraulic jack includes: a groove formed by plastic deformation of a base member in a recessed manner; and a flow path formed by ridges formed on both sides of the groove so as to face each other, the pair of ridges being in contact with each other, the portions where the ridges are in contact maintaining airtightness of the flow path by means of a coupling member.

Description

Technical Field

[0001] The utility model relates to a hydraulic jack base capable of reducing manufacturing costs and a hydraulic jack equipped with the same. Background Art

[0002] Generally speaking, a jack is a tool invented to lift a large weight with a small amount of force. It is widely used in many fields of modern society and is particularly useful in situations where heavy objects need to be lifted manually, such as when repairing a vehicle. In fact, every large vehicle over a certain size is equipped with and uses a hydraulic jack.

[0003] A hydraulic jack is a jack that uses hydraulic pressure, that is, the pressure of a fluid. By simultaneously utilizing the principle of leverage and Pascal's principle, it enables users to lift a larger load with less force.

[0004] Figure 1 It is a three-dimensional diagram of a hydraulic jack in the prior art. Figure 2 This is a photograph showing a part of a manufacturing process of a hydraulic jack according to the related art.

[0005] First, refer to Figure 1 , Figure 1 The hydraulic jack disclosed in U.S. Patent No. 4,616,807 is shown. In this prior art hydraulic jack, a hydraulic cylinder 2 is coupled to one side of a base 5, and a hydraulic pump 1 is coupled to the other side. Hydraulic cylinder 2 includes a reservoir chamber for fluid (oil) and a hydraulic space into which the pumped fluid is pressed. Hydraulic pump 1 also includes a pump chamber for accommodating the plunger to move up and down.

[0006] When the user inserts the connecting rod 14 into the sleeve 12 and repeatedly rotates the connecting rod 14 up and down, the connecting part 13 rotatably coupled to the connecting part 50 of the sleeve 12 and the base 5 converts the movement of the sleeve 12 into the up and down movement of the plunger 11. Through such pumping, the fluid in the reservoir chamber is pressed into the hydraulic space through the pump chamber, and the internal piston inserted in the hydraulic space is raised. As a result, the placement part 3 provided on the upper side of the internal piston and the object supported by the placement part 3 are lifted.

[0007] According to the above-mentioned prior art, the base 5 is provided with a flow path connecting the reservoir chamber and the pump chamber, a flow path connecting the pump chamber and the hydraulic space, check valves installed on these two flow paths to prevent fluid from flowing in one direction during pumping, a pressure relief flow path for returning the fluid to its original position after use, and a pressure relief valve installed on the pressure relief flow path. Depending on the design of the hydraulic jack, these flow paths formed in the base 5 are formed with different lengths, angles, and directions, resulting in a relatively complex structure of the base 5.

[0008] Considering the manufacturing difficulties, U.S. Patent No. 4,616,807 proposes using a plastic molded base 5. However, for lifting heavy loads like vehicles, the base 5 should be made of metal to withstand the high pressure within the hydraulic jack. However, because the flow path formed in the base 5 needs to be formed over a considerable length in a direction that is not perpendicular to the base 5 components, the process of forming the flow path in the heavy metal component is extremely difficult.

[0009] Figure 2 This photograph shows a portion of the manufacturing process for a conventional hydraulic jack. As shown, according to conventional techniques, after the base member 5 is positioned in the desired orientation, holes are drilled in the corresponding locations to form a flow path. After forming one flow path, the base member can be repositioned in another orientation, and further drilling may be required for another flow path.

[0010] In particular, when using metal parts in the base 5, drilling with a small diameter drill bit may easily break the drill bit, so a larger diameter drill bit is usually used. As a result, the flow path of the hydraulic jack cannot be realized with a small inner diameter, but must be realized with a larger inner diameter. As the flow path is formed with a larger inner diameter, the valve installed in each flow path may also be required to be large in size and high in precision.

[0011] Furthermore, when the hydraulic jack of the prior art is made of metal, the hydraulic pump 1 and the hydraulic cylinder 2 are welded and combined to the base 5, such as by Figure 1 It can be confirmed that the hydraulic pump 1 and the hydraulic cylinder 2 are arranged very close to each other, making it difficult to access the welding gun. This increases the possibility of welding defects, which may become a factor in reducing production yield and increasing manufacturing costs. Utility Model Content

[0012] Therefore, the present invention is proposed to solve the above-mentioned problems. According to one aspect of the present invention, a base for a hydraulic jack and a hydraulic jack equipped with the base are provided, which can form a flow path in a component without drilling, thereby reducing manufacturing costs and reducing the difficulty of the manufacturing process.

[0013] Other objects of the present invention will become more apparent from the embodiments described below.

[0014] In order to solve the above-mentioned problems, according to one aspect of the present invention, a base of a hydraulic jack is provided, comprising: a groove, which is formed by plastic deformation of a base component; and a flow path, which is formed by ridges, which are formed on both sides of the groove in a manner opposite to each other, a pair of the ridges are in contact with each other, and the contacting parts of the ridges maintain the airtightness of the flow path by combining components.

[0015] Wherein, the connecting component is formed by welding.

[0016] The base of the hydraulic jack further includes a vertical flow path connected to the groove.

[0017] Wherein, the base is made of metal material.

[0018] The ridge forms the same plane as other parts of the base.

[0019] According to another aspect of the present invention, a hydraulic jack is provided, comprising the base of the hydraulic jack.

[0020] The hydraulic jack is configured to introduce fluid contained in a reservoir chamber into a pump chamber and then inject the fluid into a hydraulic space. The flow path includes a reservoir chamber flow path communicating with the reservoir chamber and a hydraulic space flow path communicating with the hydraulic space.

[0021] The effects of the utility model are as follows.

[0022] According to the technical solution for solving the problem of the present invention as described above, various effects including the following can be expected. However, the present invention is not necessarily established by exerting all of the following effects.

[0023] According to an embodiment of the present invention, a flow path can be formed in a component without drilling or with a minimum of drilling, thereby reducing manufacturing costs and reducing the difficulty of the manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a stereogram of a hydraulic jack of the prior art.

[0025] Figure 2 This is a photograph showing a part of a manufacturing process of a hydraulic jack according to the related art.

[0026] Figure 3 It is a front cross-sectional view showing a hydraulic jack according to a first embodiment of the present invention.

[0027] Figure 4It is a right side sectional view showing the hydraulic jack according to the first embodiment of the present invention.

[0028] Figure 5 This is a diagram showing a base of a hydraulic jack according to a first embodiment of the present invention.

[0029] Figure 6 It is a diagram showing a process of manufacturing a base of a hydraulic jack according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. When describing with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals regardless of the reference numerals, and repeated descriptions thereof are omitted.

[0031] Figure 3 1 is a front cross-sectional view showing a hydraulic jack 1000 according to a first embodiment of the present invention. Figure 4 1 is a right side sectional view showing a hydraulic jack 1000 according to the first embodiment of the present invention. Figure 3 and Figure 4 The hydraulic jack 1000 of the first embodiment of the present invention can be roughly divided into a low-pressure component 100 , a base 300 , and a high-pressure component 400 .

[0032] The low-pressure section assembly 100 may include a pump cylinder 110 and a pump piston 120, the base 300 may include a reservoir chamber flow path 310 and a hydraulic space flow path 330 formed therein, and the high-pressure section assembly 400 may include a jack cylinder 410, a jack piston 420, and a reservoir chamber housing 500. The pump cylinder 110 has a pump chamber 190 formed therein, the jack cylinder 410 has a hydraulic space 490 formed therein, and the reservoir chamber housing 500 has a reservoir chamber 590 formed therein. The hydraulic jack 1000 operates by the movement of fluid (not shown) between these spaces.

[0033] The pump cylinder 110 has a pump chamber 190 inside and can accommodate a pump piston 120 inserted into the pump chamber 190 in a manner that allows it to move up and down. The pump piston 120 can be configured to move up and down by a user operation. Specifically, Figure 4As shown, the pump piston 120 is rotatably coupled to the pump sleeve 130, and the pump sleeve 130 can be coupled to a second connecting member 132 fixed to the base 300 via a first connecting member 131. When a user inserts a connecting rod (not shown) into the pump sleeve 130 and repeatedly rotates the connecting rod up and down, the pump piston 120 moves up and down. When the pump piston 120 rises, the volume of the pump chamber 190 increases, and the fluid in the reservoir chamber 590 flows into the pump chamber 190. When the pump piston 120 descends, the volume of the pump chamber 190 decreases, and the fluid in the pump chamber 190 can flow into the hydraulic space 490.

[0034] In order to achieve sealing between the pump cylinder 110 and the pump piston 120, an annular sealing component 160 and a limiting component 150 for fixing the position of the sealing component 160 can be inserted into the outer peripheral surface of the pump piston 120. For example, they can be arranged in a groove 140 formed on the outer peripheral surface of the pump piston 120.

[0035] The valve body 200 may be formed with a low-pressure connecting flow path 210 and a high-pressure connecting flow path 230 that are respectively communicated with the pump chamber 190. The low-pressure connecting flow path 210 may be connected to the reservoir flow path 310 formed in the base 300, and the high-pressure connecting flow path 230 may be connected to the hydraulic space flow path 330 formed in the base 300. Figure 3 The low-pressure connecting flow path 210 and the high-pressure connecting flow path 230 are depicted as being formed at different heights from each other, but this is to illustrate the working principle of the hydraulic jack. In the hydraulic jack of the first embodiment of the present utility model, the low-pressure connecting flow path 210 and the high-pressure connecting flow path 230 can be as follows. Figure 4 The depicted structures are formed in parallel at the same height within the base 300. Of course, within the operable range of the hydraulic jack, the height, position, and extending direction of the low-pressure connecting flow path 210 and the high-pressure connecting flow path 230 can be variously realized.

[0036] A first check valve 215 and a second check valve 235 may be installed in the low-pressure connecting flow path 210 and the high-pressure connecting flow path 230, respectively. The first check valve 215 and the second check valve 235 restrict fluid flow in only one direction through the low-pressure connecting flow path 210 and the high-pressure connecting flow path 230, respectively. Specifically, when the pump piston 120 ascends, the first check valve 215 opens and the second check valve 235 closes. When the pump piston 120 descends, the first check valve 215 closes and the second check valve 235 opens.

[0037] The valve body 200 may further include a pressure relief flow path 220 connecting the low-pressure connection flow path 210 and the high-pressure connection flow path 230, and may further include a pressure relief valve 225 for opening and closing the pressure relief flow path. When the user opens the pressure relief valve 225, the fluid in the hydraulic space 490 can move to the reservoir chamber 590 again through the pressure relief flow path. Figure 4 It can be confirmed that the operating portion 227 of the pressure relief valve 225 can protrude outward from the side of the valve body 200. In addition, the first check valve 215 and the second check valve 235 can be installed on the low-pressure connecting flow path 210 and the high-pressure connecting flow path 230 in the upper portion of the valve body 200, and the pressure relief flow path 220 can be formed below the first check valve 215 and the second check valve 235. As a result, the first check valve 215, the second check valve 235, and the pressure relief valve 225 can all be located within the valve body 200.

[0038] The valve body 200 may further include a safety flow path 240 and a safety valve 245. One end of the safety flow path 240 may be connected to the pump chamber 190, and the other end may be connected to the low-pressure connection flow path 210, particularly, may be connected to the low-pressure connection flow path 210 below the first check valve 215.

[0039] Safety valve 245 normally closes safety flow path 240, but when the pressure in pump chamber 190 rises excessively and exceeds a set critical value, it can be opened to allow the fluid in pump chamber 190 to flow back to reservoir chamber 590. Safety flow path 240 can also be connected to an injection port 247 on the lower surface of valve body 200.

[0040] The valve body 200 can be joined to the base 300 by methods such as resistance welding. Various ring members can be provided at the junction of the valve body 200 and the base 300 to prevent fluid leakage. This is particularly important because the internal pressures of the high-pressure connection flow path 230 and the hydraulic space flow path 330 are relatively high.

[0041] The low-pressure section assembly 100 and the high-pressure section assembly 400 can be combined with the base 300. As described above, the base 300 can form a reservoir chamber flow path 310 and a hydraulic space flow path 330. One end of the reservoir chamber flow path 310 can be connected to the pump chamber 190 via the low-pressure connecting flow path 210, and the other end can be connected to the reservoir chamber 590. One end of the hydraulic space flow path 330 can be connected to the pump chamber 190 via the high-pressure connecting flow path 230, and the other end can be connected to the hydraulic space 490.

[0042] Unlike conventional methods of forming flow paths by drilling a metal base 5 component over a considerable length in a direction not perpendicular to the base 5 component, the hydraulic jack 1000 of one embodiment of the present invention can form the reservoir chamber flow path 310 and the hydraulic space flow path 330 using a flow path forming method that does not require drilling or minimizes drilling. This will be described in more detail later.

[0043] The jack cylinder 410 may define a hydraulic space 490 therein and may accommodate the jack piston 420. The jack piston 420 may be configured to be inserted into the hydraulic space 490 and to be movable up and down relative to the jack cylinder 410. The hydraulic space 490 may be connected to the hydraulic space flow path 330 of the base 300. If the pump piston 120 is moved up and down by a user's operation, each time the up and down movement is repeated, a predetermined amount of fluid flows from the reservoir chamber 590 into the pump chamber 190 and is then pressed into the hydraulic space 490. The fluid entering the hydraulic space 490 lifts the jack piston 420, and accordingly, the mounting portion 430 provided at the upper end of the jack piston 420 and the object supported by the mounting portion 430 are lifted.

[0044] Thus, the hydraulic space 490 is filled with fluid, generating a high pressure sufficient to lift a heavy load such as a vehicle. Therefore, to prevent leakage between the jack cylinder 410 and the jack piston 420, the jack piston 420 may be equipped with various sealing members 460 and 465, restricting members 451 and 452 for restricting the movement of these sealing members, and an O-ring 470.

[0045] The reservoir housing 500 may form a reservoir 590. For example, the reservoir housing 500 may be formed around the cylindrical jack cylinder 410 so that the space between the reservoir housing 500 and the jack cylinder 410 forms the reservoir 590. The reservoir 590 may be connected to the reservoir flow path 310 of the base 300.

[0046] The base 300 of the hydraulic jack 1000 according to the first embodiment of the present invention will be described below.

[0047] Figure 5 1 is a diagram showing a base member 350 for manufacturing the base 300 of the hydraulic jack 1000 according to the first embodiment of the present invention. Figure 6 1 and 2 are views showing a process of manufacturing the base 300 of the hydraulic jack 1000 according to the first embodiment of the present invention.

[0048] As described above, according to the first embodiment of the present invention, the first check valve 215 and the second check valve 235, the pressure relief valve 225 and the safety valve 245 required for the operation of the hydraulic jack 1000 can all be arranged on the valve body 200, so the base 300 only needs to include the reservoir chamber flow path 310 and the hydraulic space flow path 330.

[0049] Figure 5 An example of a base member 350 for manufacturing the base 300 is shown in a plan view, a right side sectional view, and a front sectional view. The front sectional view is a sectional view taken along line AA on the plan view, and the right side sectional view is a sectional view taken along line BB on the plan view. Figure 5 The base member 350 is shown in an intermediate state of processing where processing has not yet been completed.

[0050] exist Figure 5 In the embodiment, grooves 351 and 352 are formed on one surface of a base member 350, and ridges 370 are formed on both sides of the grooves 351 and 352. The first groove 351 can be formed, for example, to correspond to the reservoir flow path 310, and the second groove 352 can be formed, for example, to correspond to the reservoir flow path 330. Vertical flow paths 311 and 312 connected to the other surface of the base member 350 can be formed at both ends of the first groove 351, and vertical flow paths 331 and 332 connected to the other surface of the base member 350 can be formed at both ends of the second groove 352.

[0051] Figure 6 3 is a diagram showing a process of manufacturing a base of a hydraulic jack according to a first embodiment of the present invention. In order to form the base, first, one side of the base member 350 is heated to a forging temperature. Here, the forging temperature refers to a temperature at which hot forging of the base member 350 can be performed, and the specific temperature may vary depending on the material applied to the base member 350. For example, when the base member 350 is formed of carbon steel, the forging temperature may be a temperature of 800 to 1200°C for performing hot forging of carbon steel. As one side of the base member 350 is heated to the forging temperature, the heated side of the base member 350 is in a state where it can be formed.

[0052] On the other hand, according to the first embodiment of the present invention, before heating one side of the base member 350, vertical flow paths 311, 312, 331, 332 can be drilled in the base member 350. The vertical flow paths 311, 312, 331, 332 can all extend in the same direction, and since the holes are drilled vertically over a wide area of the base member 350, processing is facilitated.

[0053] After heating one side of the base member 350 , the heated side may be pressurized to form the grooves 351 , 352 and the ridges 370 .

[0054] Figure 6 (a) depicts the grooves 351, 352 and the ridge 370 formed by pressurizing the heated side. Figure 5 The illustrated state of the base member 350 also corresponds to a state after the grooves 351 , 352 and the ridge 370 are formed.

[0055] like Figure 6As shown in (a), one side of a heated base member 350 can be pressurized by a forging press 10 including pressurizing members 11 and 12. As a result, deep grooves 351 and 352, each open to one side, can be formed on the one side of the heated base member 350, corresponding to the pressurizing members 11 and 12. Simultaneously, the material originally within the grooves 351 and 352 is pushed toward the sides of the grooves 351 and 352, plastically deforming. This forms ridges 370 protruding upward from the one side of the base member 350 on both sides of the grooves 351 and 352. A pair of left and right ridges 370 can be opposed to each other, centered around the grooves 351 and 352.

[0056] Since the grooves 351 , 352 formed corresponding to the press members 11 , 12 will later form flow paths within the base member 350 , the press members 11 , 12 of the forging press 10 are prepared corresponding to the position and size of each flow path.

[0057] According to the base 300 of the hydraulic jack 1000 of the first embodiment of the present invention, since the various valves 215, 225, 235, and 245 required for operation are concentrated in the valve body 200, only the reservoir flow path 310 and the hydraulic space flow path 330 need to be formed in the base 300. Accordingly, the reservoir flow path 310 and the hydraulic space flow path 330 can be formed in a parallel arrangement at the same depth. However, if Figure 6 As shown, the flow paths 310 and 330 may be formed to have different depths, widths, directions, etc. from each other, thereby further increasing the degree of freedom in design.

[0058] The ridges 370 can be pressed upwards toward the grooves 351 and 352 to shield the open surfaces of the grooves 351 and 352. That is, when the base member 350 is heated to the forging temperature, the ridges 370 on both sides of the grooves 351 and 352 can be deformed upwards toward the open portions of the grooves 351 and 352.

[0059] The process of masking the open faces of the grooves 351, 352 with the ridge 370 can be performed, for example, by Figure 6 The processes shown in (b) and (c) are performed. Figure 6 (b) shows a process of pressing the base member 350 using the first press 21 having the surface 13 forming a predetermined angle with respect to the surface of the base member 350 .

[0060] When the base component 350 formed with the grooves 351, 352 and the ridges 370 is pressurized using the first press 21 while the base component 350 is heated to the forging temperature, the ridges 370 of the base component 350 also form a corresponding angle through the angled surface 13 in the first press 21 and gather above the grooves 351, 352, so that the pair of ridges 370 can contact each other. Figure 6 (b) shows a situation where the surface 13 of the first press 21 forms an angle of about 45 degrees relative to one side of the base member 350, but the present invention is not limited thereto and other angles that can effectively gather the ridges 370 above the grooves 351 and 352 can also be formed.

[0061] Figure 6 (c) shows a process of pressing the base member 350 using the second press 22 having a surface 14 parallel to the surface of the base member 350. When the base member 350 is pressed by the second press 22 in a state where the ridges 370 are gathered above the grooves 351 and 352 by the first press 21, the ridges 370 can form substantially the same plane as the rest of the base member 350 while covering the open surfaces of the grooves 351 and 352.

[0062] After the grooves 351 and 352 are covered with the ridges 370, the deformed ridges 370 above the grooves 351 and 352 can be joined together and cooled. As a result, the base 300 having the flow paths 310 and 330 formed therein can be completed. However, in order to further improve the sealing performance of the flow paths 310 and 330, the ridges 370 on both sides of the grooves 351 and 352 that are pressed above the grooves 351 and 352 can be welded together. Figure 6 As depicted in (d), when the gap between the ridges 370 on both sides is welded using the welding tool 30, the grooves 351 and 352 inside thereof can be completely sealed to complete the flow paths 310 and 330.

[0063] A bonding member may be formed at a portion where the pair of ridges 370 are brought into contact with each other by welding. The bonding member is formed at a joint portion of the pair of ridges 370 to maintain airtightness of the flow path.

[0064] Although Figure 5 3 shows as an example a case where grooves 351 and 352 are formed on the lower surface of the base member 350 and vertical flow paths 311, 312, 331, 332 are formed on the upper surface of the base member 350. However, both the grooves 351 and 352 and the vertical flow paths 311, 312, 331, 332 may be formed on the upper surface of the base member 350. In an embodiment (not shown), the vertical flow paths 311, 312, 331, 332 may be realized by maintaining the grooves 351 and 352 open at designated positions after the grooves 351 and 352 are formed on the upper surface of the base member 350, rather than drilling the vertical flow paths 311, 312, 331, 332 through a separate drilling process.

[0065] Unlike the prior art which increases the difficulty of the process and the cost due to the requirement to drill a considerable length in a direction that is not orthogonal to the component of the base 5, according to one embodiment of the present invention, it is only necessary to drill a short distance in a direction orthogonal to the base component 350, and the drilling itself can also be omitted, thereby reducing the manufacturing cost and the difficulty of the manufacturing process.

[0066] Although the present invention has been described above with reference to an embodiment, those skilled in the art will appreciate that the present invention may be modified and altered in various ways without departing from the scope of the invention and the spirit of the invention as set forth in the following claims.

Claims

1. A base for a hydraulic jack, characterized in that: include: a groove formed by plastic deformation of the base member; as well as a flow path formed by ridges formed on both sides of the groove in a manner opposed to each other, A pair of said ridges are in contact with each other, The portion where the ridges are in contact maintains the airtightness of the flow path via a bonding member.

2. The base of the hydraulic jack according to claim 1, characterized in that: The joining member is formed by welding.

3. The base of the hydraulic jack according to claim 1, characterized in that: Also includes: A vertical flow path is communicated with the groove.

4. The base of the hydraulic jack according to claim 1, characterized in that: The base is made of metal.

5. The base of the hydraulic jack according to claim 1, characterized in that: The ridge forms the same plane as the rest of the base.

6. A hydraulic jack, characterized in that: A base comprising the hydraulic jack according to any one of claims 1 to 5.

7. The hydraulic jack according to claim 6, characterized in that: The hydraulic jack is configured to introduce fluid contained in a reservoir chamber into a pump chamber and then inject the fluid into a hydraulic space. The flow path includes a reservoir chamber flow path communicating with the reservoir chamber and a hydraulic space flow path communicating with the hydraulic space.

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