Improved oil drainage mechanism of light jack

Abstract

The improved oil drainage mechanism is matched with an oil pump body, at least one valve cavity, a movable cavity, an oil storage cavity and an oil return channel are formed in the oil pump body, the valve cavity is located in the middle of the oil return channel and communicated with the oil return channel, and the two ends of the oil return channel are communicated with the oil storage cavity and the movable cavity respectively. The oil pump further comprises an oil drain valve which is arranged in the valve cavity and is provided with a driving part extending to the outer side of the valve cavity, and an oil outlet valve which is arranged in the valve cavity and is provided with an oil inlet and an oil outlet, the rotating shaft is axially arranged in the inner cavity of the pressing hand and is rotationally positioned with the pressing hand; the transmission part is used for transmitting power of the rotating shaft to drive the oil drain valve to be opened and closed and comprises a first gear, a second gear and a third gear, and the first gear is rotationally assembled on a base platform formed on one side of the oil pump body; two ends of the universal joint are respectively connected with the first gear and the first end of the rotating shaft; and the second gear and the driving part are coaxially arranged, and the second gear is engaged with the first gear. The operation process can be effectively simplified, and pressure relief operation can be conveniently achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting tools, and particularly relates to an improved oil discharge mechanism for a light jack. Background Art

[0002] When using a jack, the handle needs to be connected to the presser first, and then the handle is operated. The reciprocating movement of the pump core of the oil pump is driven by the presser to lift heavy objects. When the pressure needs to be released after the lifting task is completed, the oil discharge valve on the jack is opened, and the oil return channel is unblocked. Under the action of oil pressure, the jack can be smoothly reset. Currently, the oil discharge mechanisms adopted by light jacks mainly include the following structures:

[0003] First, during the pressure relief and oil discharge operation, the handle and the presser need to be separated from each other first, and then the oil discharge valve is rotated by means of the handle to complete the pressure relief operation. The overall process is rather cumbersome and inconvenient;

[0004] Second, as Figure 3 shown, the presser and the oil discharge valve are connected by a set (usually two) of gears. During the pressure relief and oil discharge operation, the operator only needs to directly rotate the handle to easily open the oil discharge valve, and there is no need to disassemble the handle throughout the process. However, in the above structure, one of the gears is installed on the presser and will swing with the presser during operation, and the other gear is installed on the main body of the oil pump. The two are always in a dynamic meshing state. Limited by the machining accuracy of the gears and the wear caused by long-term frequent use, it is very easy to cause poor gear meshing, which has an adverse impact on the service life of the gears;

[0005] Third, as Figure 4 shown, the presser and the oil discharge valve are connected by a universal joint. This connection method makes the overall structure relatively stable. During the pressure relief and oil discharge operation, the operator directly rotates the handle to easily open the oil discharge valve. However, in the above structure, the presser is hinged on the wall plate and is located on the right side of the main body of the oil pump. This layout causes the size of the wall plate to increase, resulting in an increase in the overall volume of the jack, which not only occupies more space but also increases the cost of the product. Summary of the Invention

[0006] The present application provides an improved oil discharge mechanism for a light jack to at least solve the problems of cumbersome and inconvenient pressure relief operation of the light jack in the prior art, poor meshing caused by the dynamic meshing of gears during long-term use, and the increase in the overall volume.

[0007] In a first aspect, the present application provides an improved oil discharge mechanism, which is arranged in cooperation with a pump body of an oil pump. At least one valve cavity, one movable cavity, one oil storage cavity and one oil return channel are opened in the pump body of the oil pump. The valve cavity is located in the middle of the oil return channel and is communicated with the oil return channel. The two ends of the oil return channel are respectively communicated with the oil storage cavity and the movable cavity. And a presser is movably hinged on the main body of the oil pump. The improved oil discharge mechanism further includes:

[0008] An oil drain valve, which is arranged in the valve cavity and has a driving part extending to the outside of the valve cavity;

[0009] A rotating shaft, which is axially arranged in the inner cavity of the pressing hand and is rotationally positioned with the pressing hand;

[0010] A transmission part, which is used to transmit the power of the rotating shaft to drive the opening and closing of the oil drain valve. The transmission part includes: a first gear, which is rotatably assembled on a base formed on one side of the oil pump main body; a universal joint, the two ends of which are respectively connected to the first gear and the first end of the rotating shaft; a second gear, which is coaxially arranged with the driving part and meshes with the first gear.

[0011] Optionally, there is an included angle between the rotation axis of the first gear and the rotation axis of the second gear, and the included angle is 45° - 60°.

[0012] Optionally, the universal joint is a cross universal joint, and the center of the universal joint is located on the rotation axis of the pressing hand.

[0013] Optionally, the universal joint includes:

[0014] A first fork, which is coaxially and fixedly assembled with the rotating shaft;

[0015] A second fork, which is coaxially and fixedly assembled with the first gear;

[0016] A cross shaft, which is arranged between the first fork and the second fork to relay the transmission between the first fork and the second fork.

[0017] Optionally, the oil drain valve includes:

[0018] A driving part, the first end of which is coaxially and fixedly assembled with the second gear, and the second end of which is axially positioned in the valve cavity and is rotationally assembled with the inner cavity of the valve cavity;

[0019] A valve rod, which has a first rod part and a second rod part. The first rod part is threadedly connected to the inner wall of the valve cavity, and the second rod part extends to the outside of the valve cavity and is axially movably connected to the second end of the driving part;

[0020] A steel ball, which is movably arranged in the valve cavity and is located at the free end of the first rod part. Among them, the diameter of the steel ball is larger than the diameter of the oil return channel, so as to block the oil return channel when it is pushed by the valve rod.

[0021] Optionally, the free end cross section of the second rod part is in a rectangular structure, and a rectangular positioning hole matching the second rod part is axially opened at the second end of the driving part.

[0022] Optionally, it further includes a handle, the handle has a plug-in part movably assembled from the free end of the pressing hand. A rotation matching groove is opened at the free end of the plug-in part, and a rotation matching head matching the rotation matching groove is formed at the second end of the rotating shaft.

[0023] Optionally, at least one locking bolt is threadedly assembled at the position of the pressing hand corresponding plugging part, and the bolt tail of the locking bolt extends into the annular groove opened on the plugging part to lock and assemble the pressing hand and the handle.

[0024] Compared with the related art, the improved oil discharge mechanism of the light jack provided by the present application has at least the following technical effects:

[0025] 1. When using this light jack, the user only needs to rotate the handle, and its power is transmitted through the universal joint and driven by the meshing of the first gear and the second gear, driving the valve rod of the oil discharge valve to rotate, easily realizing the pressure relief operation. The whole process does not require separating the handle from the pressing hand, greatly simplifying the operation process and providing a good user experience.

[0026] 2. The pressing hand in this product is hinged on the oil pump main body without the need to cooperate with the wall panel, and the structure is more compact, thereby reducing the overall volume of the light jack. This not only reduces the production cost but also enhances the portability of the light jack product, especially suitable for being loaded in the trunk of a car to provide guarantee for car emergencies.

[0027] 3. When using this product, the swing of the pressing hand will not drive the first gear and the second gear to move, eliminating the dynamic meshing state of the first gear and the second gear. The stable structure ensures the reliability of the product operation and significantly extends its service life.

[0028] The details of one or more embodiments of the present application are set forth in the following drawings and description, so that other features, objects, and advantages of the present application will become more concise and understandable. Brief Description of the Drawings

[0029] Figure 1 is a cross-sectional view of the structure of a light jack shown according to an exemplary embodiment.

[0030] Figure 2 is one of the cross-sectional views of the improved oil discharge mechanism shown according to an exemplary embodiment.

[0031] Figure 3 is the second cross-sectional view of the improved oil discharge mechanism shown according to an exemplary embodiment.

[0032] Figure 4 is one of the structural schematic diagrams of the prior art.

[0033] Figure 5 is the second structural schematic diagram of the prior art.

[0034] Description of the Reference Numerals:

[0035] Oil pump body 1; valve cavity 101; movable cavity 102; oil storage cavity 103; oil return passage 104; one-way valve 105; oil cylinder cavity 106; oil inlet passage 107; jacking member 108; oil pump core 109;

[0036] Pressing hand 2; oil drain valve 3; driving part 301; valve rod 302; steel ball 303; rotating shaft 4;

[0037] Transmission part 5; first gear 501; universal joint 502; first joint fork 521; second joint fork 522; cross shaft 523; second gear 503;

[0038] Locking bolt 6; handle 7; plugging part 701; screwing groove 702; annular groove 703. Specific embodiments

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Embodiment 1

[0041] The embodiment of the present invention provides an improved oil drain mechanism for a light jack. Figure 1 It is a sectional view of the structure of a light jack shown according to an exemplary embodiment. Figure 2 It is one of the sectional views of the improved oil drain mechanism shown according to an exemplary embodiment. Figure 3 It is the second sectional view of the improved oil drain mechanism shown according to an exemplary embodiment. As Figures 1-3 shown, this improved oil drain mechanism is arranged in cooperation with an oil pump pump body 1. At least one valve cavity 101, one movable cavity 102, one oil storage cavity 103 and one oil return passage 104 are provided in the oil pump pump body 1. The valve cavity 101 is located in the middle of the oil return passage 104 and communicates with the oil return passage 104. The two ends of the oil return passage 104 are respectively communicated with the oil storage cavity 103 and the movable cavity 102. A pressing hand 2 is movably hinged to the oil pump main body 10 through a pin 8;

[0042] In this embodiment, referring to the attached Figures 1-2 , an oil pump pump core 109 is assembled in the movable cavity 102. There is also an oil cylinder cavity 106. A jacking part 108 driven by oil pressure is provided in the oil cylinder cavity 106. It also includes:

[0043] An oil drain valve 3, which is arranged in the valve cavity 101 and has a driving part 301 extending to the outside of the valve cavity 101; the oil return passage passes through the valve cavity 7, and the two ends of the oil return passage communicate with the oil storage cavity and the cylinder cavity of the oil cylinder

[0044] A rotating shaft 4, which is axially arranged in the inner cavity of the pressing hand 2 and is rotationally positioned with the pressing hand 2;

[0045] The transmission member 5 is used to transmit the power of the rotating shaft 4 to drive the opening and closing of the oil drain valve 3. The transmission member 5 includes: a first gear 501 rotatably assembled on a base formed on one side of the oil pump main body 10; a universal joint 502 with both ends respectively connected to the first end of the first gear 501 and the rotating shaft 4; a second gear 503 coaxially arranged with the driving part and meshing with the first gear 501.

[0046] There is an included angle between the rotation axis of the first gear 501 and the rotation axis of the second gear 503, and the included angle is 45° - 60°, preferably 45° or 60°. This angle of the included angle can make the meshing of the first gear and the second gear stable, so as to ensure the stability of gear transmission.

[0047] In the technical solution of the above embodiment, during use, the rotational force of the rotating shaft 4 is transmitted by the universal joint 502, thereby driving the first gear 501 to drive the second gear 502 to rotate. The second gear 502 is connected to the driving part 301, and further controls the working state of the oil drain valve 3.

[0048] Continue to refer to the appendix Figures 1-3 The universal joint 502 is a cross universal joint, and the center of the universal joint 502 is located on the rotation axis of the push button 2; the universal joint 502 includes: a first yoke 521 fixedly assembled coaxially with the rotating shaft 4; a second yoke 522 fixedly assembled coaxially with the first gear 501; a cross shaft 523 arranged between the first yoke 521 and the second yoke 522 to relay the transmission between the first yoke 521 and the second yoke 522, and the center of the cross shaft 523 is located on the rotation axis of the push button 2.

[0049] In the technical solution of the above embodiment, the rotational transmission between the rotating shaft 4 and the second gear 503 is realized through the universal joint 502. Among them, the universal joint 502 can realize the power transmission of variable angles, and this setting can ensure that during the rotation of the push button 2, the cross universal joint can stably and efficiently transmit power or change angles, ensuring the smoothness and stability of the operation of the light jack. It can be understood that when the push button 2 swings up and down, it drives the movement of the first yoke 521, but the second yoke 522 remains stationary, and the positions of the first gear 501 and the second gear 503 remain relatively fixed, effectively improving the transmission stability.

[0050] Continue to refer to the appendix Figures 1-3 In this embodiment, the oil drain valve 3 includes:

[0051] A driving part 301, its first end is fixedly assembled coaxially with the second gear 503, and its second end is axially positioned in the valve cavity 101 and rotatably assembled with the inner cavity of the valve cavity 101;

[0052] The valve stem 302 has a first rod portion and a second rod portion. The first rod portion is threadedly connected to the inner wall of the valve cavity 101, and the second rod portion extends outside the valve cavity 101 and is axially movably connected to the second end of the driving portion 301. Wherein, the free end cross-section of the second rod portion is in a rectangular structure, and a rectangular positioning hole matching the second rod portion is axially formed at the second end of the driving portion 301;

[0053] The steel ball 303 is movably arranged in the valve cavity 101 and is located at the free end of the first rod portion. Wherein, the diameter of the steel ball 303 is larger than the diameter of the oil return passage 104 to block the oil return passage 104 when it is pushed by the valve stem 302.

[0054] Continue to refer to the appendix Figure 2 It further includes a handle 7. The handle 7 has a plug-in portion 701 movably assembled at the free end of the self-pressing hand 2. A screw fitting groove 702 is formed at the free end of the plug-in portion 701, and a screw fitting head 201 matching the screw fitting groove 702 is formed at the second end of the rotating shaft 4; At least one locking bolt 6 is threadedly assembled at the position of the pressing hand 2 corresponding to the plug-in portion 701, and the bolt tail of the locking bolt 6 extends into the annular groove 703 formed on the plug-in portion 701 to lock and assemble the pressing hand 2 and the handle 7.

[0055] In this embodiment, the front end of the pressing hand 2 is movably hinged to the oil pump main body 10, the handle 7 is inserted into the rear end of the pressing hand 2, and then locked and fixed with the annular groove formed on the handle 7 through the locking bolt 6. Therefore, when the handle 7 is axially connected to the pressing hand 2, the handle 7 can still rotate around its own axis; Operating the handle 7 can cause the pressing hand 2 to drive the oil pump core 109 in the movable cavity 102 to move, driving the oil in the oil storage cavity 103 to reach the oil cylinder cavity 106 through the connected oil inlet passage 107 and the one-way valve 105 that allows oil to enter unidirectionally, and then driving the lifting member to extend from the oil cylinder cavity 106 to lift the heavy object; At the same time, a plug-in fit is formed between the handle 7 and the rotating shaft 4. Rotating the handle 7 can sequentially drive the rotation of the rotating shaft 4, the first gear 501 and the second gear 503, so as to open or close the oil drain valve 3.

[0056] In the technical solution of the above embodiment, in combination with the appendix Figures 1-2, under normal conditions, the valve rod 302 presses down against the steel ball 303, and the oil return passage 104 is blocked and disconnected by the steel ball 303. During jacking, the operating handle 7 swings up and down, and the hydraulic medium in the oil storage cavity 103 can only enter the oil cylinder cavity 106 through the oil inlet passage 107 and the one-way valve 105 that allows one-way oil inlet, driving the jacking member to extend from the oil cylinder cavity 106 to jack up the heavy object; conversely, when depressurizing, the handle 7 is rotated in the reverse direction, and the rotational force of the rotating shaft 4 drives the driving part 301 to rotate in the valve cavity 101 through the relay transmission of the transmission member 5. Since the valve rod 302 is axially movably assembled with the driving part 301 and the rotation direction is limited, the valve rod 302 moves upward under the cooperation of the thread, releasing the steel ball 303, and the oil return passage 104 is opened. The hydraulic medium in the oil cylinder cavity 106 returns to the oil storage cavity 103 under the action of pressure, and the jack resets.

[0057] In an alternative embodiment (not shown in the figure), at least one axially extending key portion is provided on the side wall of the second rod portion, and an activity hole matching the second rod portion is axially opened at the second end of the driving part 301, and at least one key groove matching the key portion is provided on the axially side wall of the activity hole.

[0058] In another alternative embodiment (not shown in the figure), the second end of the driving part 301 has an extension portion, and at least one axially extending key portion is provided on the annular side wall of the extension portion, and an activity hole matching the second rod portion is axially opened at the free end of the second rod portion, and at least one key groove matching the key portion is provided on the axially side wall of the activity hole.

[0059] In the technical solutions of the above two alternative embodiments, only the specific axial movable connection structure between the valve rod 302 and the driving part 301 is changed, and it does not affect the overall implementation of the solution, and the effects are the same, as an alternative replacement solution.

[0060] Embodiment 2

[0061] The difference between this embodiment and Embodiment 1 is that Embodiment 2 of the present invention provides a light jack. As Figure 1 shown, it includes the improved oil discharge mechanism of the above Embodiment 1.

[0062] In the technical solution of the above embodiment, the usage method of the improved oil discharge mechanism of the light jack is as follows:

[0063] S1. Insert the handle 7 into the rear end of the push button 2 and tighten the locking bolt 6 for axial positioning; then, by swinging the handle 7 up and down, the jacking operation of the heavy object can be easily achieved;

[0064] S2. After the jacking is completed, turn the handle 7. The power generated will be transmitted along the rotating shaft 4, and the direction of force transmission will be changed via the transmission member 5, and the power will be transmitted to the oil drain valve 3, prompting the oil drain valve 3 to open, thereby realizing the pressure relief operation. The pressure relief process ends, and the jack resets.

[0065] S3. Rotate the handle 7 in the reverse direction to close the oil drain valve 3, preparing for the next jacking of the heavy object.

[0066] For other structures not described, refer to Embodiment 1.

[0067] In summary, for the improved oil drain mechanism of the light jack provided in the embodiment of the present invention, the user only needs to turn the handle 7 to easily realize the pressure relief operation. The whole process does not require separating the handle from the press button, greatly simplifying the operation process and bringing a convenient use experience to the user. At the same time, the press button 2 is hinged on the oil pump main body 1 without the need to cooperate with the wall panel, and the structure is more compact, reducing the overall volume of the light jack. Further, the improved oil drain mechanism also eliminates the dynamic meshing state of the first gear 501 and the second gear 503, ensuring the reliability of the product operation and significantly extending its service life.

[0068] The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

Claims

1. An improved oil discharge mechanism of a light jack, which is arranged in conjunction with an oil pump body, wherein the oil pump body is provided with at least one valve chamber, one movable chamber, one oil storage chamber and one oil return passage, wherein the valve chamber is located in the middle of the oil return passage and is connected to the oil return passage, and the two ends of the oil return passage are connected to the oil storage chamber and the movable chamber respectively, and a push handle is movably hinged on the oil pump body, characterized in that: Also included are: An oil drain valve is disposed in the valve cavity and has a driving portion extending to the outside of the valve cavity; A rotating shaft, which is axially disposed in the inner cavity of the snap handle and is rotatably positioned with the snap handle; A transmission member, which is used to transmit the power of the rotating shaft to drive the oil drain valve to open and close, and the transmission member includes: a first gear, which is rotatably assembled on a base formed on one side of the oil pump body; A universal joint, two ends of which are respectively connected to the first gear and the first end of the rotating shaft; a second gear, which is coaxially arranged with the driving part and meshedly connected with the first gear.

2. The improved oil release mechanism according to claim 1, characterized in that: The rotation axis of the first gear and the rotation axis of the second gear have an included angle, and the included angle is 45° to 60°.

3. The improved oil release mechanism according to claim 1, characterized in that: The universal joint is a cross universal joint, and the center of the universal joint is located on the rotation axis of the click handle.

4. The improved oil release mechanism according to claim 1, characterized in that: The universal joint comprises: A first yoke, which is coaxially fixedly assembled with the rotating shaft; A second yoke, which is coaxially fixedly assembled with the first gear; A cross shaft is disposed between the first yoke and the second yoke to relay transmission between the first yoke and the second yoke.

5. The improved oil release mechanism according to claim 1, characterized in that: The oil drain valve comprises: A driving part, a first end of which is coaxially fixedly assembled with the second gear, and a second end of which is axially positioned in the valve cavity and rotatably assembled with the inner cavity of the valve cavity; The valve stem comprises a first stem portion and a second stem portion, wherein the first stem portion is threadedly connected to the inner wall of the valve cavity, and the second stem portion extends to the outside of the valve cavity and is axially movably connected to the second end of the driving portion; A steel ball is movably disposed in the valve cavity and located at the free end of the first rod portion, wherein the diameter of the steel ball is larger than the diameter of the oil return passage so as to block the oil return passage when the steel ball is pushed by the valve stem.

6. The improved oil release mechanism according to claim 5, characterized in that: The cross section of the free end of the second rod portion is a rectangular structure, and a rectangular positioning hole matching the second rod portion is axially opened at the second end of the driving portion.

7. The improved oil release mechanism according to claim 1, characterized in that: The handle has a plug-in portion movably assembled from the free end of the snap handle, a screw-in groove is provided on the free end of the plug-in portion, and a screw-in head is formed on the second end of the rotating shaft to match and engage with the screw-in groove.

8. The improved oil release mechanism according to claim 1, characterized in that: The snap handle is threadedly assembled with at least one locking bolt at a position corresponding to the plug-in portion, and the bolt tail of the locking bolt extends into an annular groove provided on the plug-in portion to lock and assemble the snap handle and the handle.

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