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 pressure relief valve can effectively simplify the operation process and conveniently realize the pressure relief operation.

Description

Technical Field

[0001] This utility model relates to the field of lifting tool technology, specifically to an improved oil discharge mechanism for a lightweight jack. Background Technology

[0002] When using a jack, the handle must first be connected to the lever, and then the handle is operated. The lever drives the oil pump core to reciprocate, thus lifting the heavy object. When the lifting task is complete and pressure needs to be released, the drain valve on the jack is opened, the oil return channel is opened, and the jack can smoothly return to its original position under oil pressure. Currently, the drain mechanisms used in light-duty jacks mainly cover the following structures:

[0003] First, during the depressurization and oil release operation, the handle and the lever must be separated first, and then the oil release valve must be turned with the handle to complete the depressurization operation. The whole process is quite cumbersome and inconvenient.

[0004] Second, such as Figure 3 As shown, the handle and the drain valve are connected by a set of gears (usually two). During the pressure relief and drain operation, the operator only needs to turn the handle to easily open the drain valve without disassembling the handle. However, in the above structure, one gear is mounted on the handle and swings with the handle during operation, while the other gear is mounted on the pump body. The two are always in a dynamic meshing state. Due to the limited machining accuracy of the gears, coupled with the wear caused by long-term and frequent use, it is very easy to cause poor gear meshing, which will have an adverse effect on the service life of the gears.

[0005] Third, such as Figure 4 As shown, the handle and the drain valve are connected by a universal joint. This connection method makes the overall structure relatively stable. During pressure relief and draining operations, the operator can easily open the drain valve by simply turning the handle. However, in the above structure, the handle is hinged to the wall panel and located on the right side of the oil pump body. This layout requires an increase in the size of the wall panel, which in turn increases the overall size of the jack, occupying more space and increasing the product cost. Utility Model Content

[0006] This application provides an improved oil release mechanism for a lightweight jack, which at least solves the problems of cumbersome and inconvenient pressure release operation of lightweight jacks in the prior art, poor meshing caused by dynamic meshing of gears during long-term use, and increased overall size.

[0007] In a first aspect, this application provides an improved oil discharge mechanism, which is configured in conjunction with an oil pump body. The oil pump body has at least one valve chamber, one movable chamber, one oil storage chamber, and one oil return channel. The valve chamber is located in the middle of the oil return channel and communicates with it. Both ends of the oil return channel are respectively connected to the oil storage chamber and the movable chamber. A lever is movably hinged to the oil pump body. The mechanism also includes:

[0008] An oil drain valve is disposed within a valve chamber and has a drive portion extending to the outside of the valve chamber.

[0009] The pivot is axially positioned within the inner cavity of the press and rotates to be positioned with the press.

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

[0011] Optionally, the rotation axis of the first gear and the rotation axis of the second gear have an angle of 45° to 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 lever.

[0013] Optionally, the universal joint includes:

[0014] The first fork section is fixedly assembled coaxially with the pivot.

[0015] The second fork is coaxially and fixedly assembled with the first gear.

[0016] A cross shaft is positioned between the first and second forks to relay the transmission between them.

[0017] Optionally, the drain valve includes:

[0018] The drive unit has its first end fixedly assembled coaxially with the second gear, and its second end axially positioned inside the valve cavity and rotatably assembled with the inner cavity of the valve cavity.

[0019] The valve stem has a first rod portion and a second rod portion, the first rod portion being threadedly connected to the inner wall of the valve cavity, and the second rod portion extending to the outside of the valve cavity and being axially movably connected to the second end of the drive portion;

[0020] A steel ball is movably disposed within the valve cavity and located at the free end of the first rod. The diameter of the steel ball is larger than the diameter of the return oil passage, so as to block the return oil passage when it is pushed by the valve rod.

[0021] Optionally, the free end of the second rod has a rectangular cross-section, and the second end of the drive unit is provided with a rectangular positioning hole that matches the second rod.

[0022] Optionally, it also includes a handle, the handle having a self-pressing free end movable fitting part, the free end of the fitting part having a screw-fit groove, and the second end of the rotating shaft having a screw-fit head that matches and engages with the screw-fit groove.

[0023] Optionally, at least one locking bolt is threaded onto the corresponding insertion part of the presser, with the tail of the locking bolt extending into an annular groove on the insertion part to lock the presser and handle in place.

[0024] Compared with related technologies, the improved oil discharge mechanism of the lightweight jack provided in this application has at least the following technical advantages:

[0025] 1. When using this lightweight jack, the user only needs to turn the handle. The power is transmitted through the universal joint and driven by the meshing of the first and second gears, which drives the valve stem of the oil release valve to rotate, easily realizing the pressure relief operation. The entire process does not require separating the handle from the push handle, which greatly simplifies the operation process and provides a good user experience.

[0026] 2. The handle in this product is hinged to the oil pump body, eliminating the need for a wall panel. This results in a more compact structure and reduces the overall size of the lightweight jack. This not only lowers production costs but also enhances the portability of the lightweight jack, making it especially suitable for loading in the trunk of a car to provide emergency protection for vehicles.

[0027] 3. When using this product, the swinging of the 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] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

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

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

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

[0032] Figure 4 This is one of the structural diagrams of existing technology.

[0033] Figure 5 This is the second structural diagram of existing technology.

[0034] Explanation of reference numerals in the attached figures:

[0035] Oil pump body 1; valve chamber 101; movable chamber 102; oil storage chamber 103; oil return channel 104; check valve 105; oil cylinder chamber 106; oil inlet channel 107; lifting component 108; oil pump core 109;

[0036] 2. Handle; 3. Drain valve; 301. Drive unit; 302. Valve stem; 303. Steel ball; 4. Rotary shaft;

[0037] Transmission component 5; First gear 501; Universal joint 502; First fork 521; Second fork 522; Cross shaft 523; Second gear 503;

[0038] Locking bolt 6; handle 7; plug-in part 701; screw-fit groove 702; annular groove 703. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely for explaining the present utility model and are not intended to limit the present utility model.

[0040] Example 1

[0041] This utility model embodiment provides an improved oil draining mechanism for a lightweight jack. Figure 1 This is a cross-sectional view of a lightweight jack structure according to an exemplary embodiment. Figure 2 This is one of the cross-sectional views of an improved oil discharge mechanism shown according to an exemplary embodiment. Figure 3 This is a second cross-sectional view of an improved oil discharge mechanism according to an exemplary embodiment. (See example...) Figure 1-3 As shown, the improved oil discharge mechanism is configured in conjunction with an oil pump body 1. The oil pump body 1 has at least one valve chamber 101, one movable chamber 102, one oil storage chamber 103 and one return oil channel 104. The valve chamber 101 is located in the middle of the return oil channel 104 and communicates with the return oil channel 104. The two ends of the return oil channel 104 are respectively connected to the oil storage chamber 103 and the movable chamber 102. A handle 2 is movably hinged to the oil pump body 10 via a shaft pin 8.

[0042] In this embodiment, refer to the appendix. Figure 1-2 The movable cavity 102 is equipped with an oil pump core 109 and also has an oil cylinder cavity 106. The oil cylinder cavity 106 is provided with a hydraulically driven lifting member 108, and also includes:

[0043] The drain valve 3 is disposed within the valve chamber 101 and has a drive portion 301 extending to the outside of the valve chamber 101; the return oil passage passes through the valve chamber 7, and the two ends of the return oil passage connect the oil storage chamber and the cylinder chamber of the oil cylinder.

[0044] The rotating shaft 4 is axially positioned within the inner cavity of the handle 2 and rotates to be positioned with the handle 2.

[0045] The transmission component 5 is used to transmit power from the rotating shaft 4 to drive the oil drain valve 3 to open and close. The transmission component 5 includes: a first gear 501, which is rotatably mounted on a base formed on one side of the oil pump body 10; a universal joint 502, whose two ends are respectively connected to the first gear 501 and the first end of the rotating shaft 4; and a second gear 503, which is coaxially arranged with the drive unit and meshes with the first gear 501.

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

[0047] In 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 drive unit 301, thereby controlling the working state of the oil drain valve 3.

[0048] Continue to refer to the appendix Figure 1-3 Universal joint 502 is a cross universal joint, and the center of universal joint 502 is located on the rotation axis of the handle 2; universal joint 502 includes: a first fork 521, which is coaxially fixedly assembled with the rotating shaft 4; a second fork 522, which is coaxially fixedly assembled with the first gear 501; and a cross shaft 523, which is disposed between the first fork 521 and the second fork 522 to relay the transmission of the first fork 521 and the second fork 522, and the center of the cross shaft 523 is located on the rotation axis of the handle 2.

[0049] In the above embodiment, the rotational transmission between the shaft 4 and the second gear 503 is achieved through the universal joint 502. The universal joint 502 can realize the power transmission of variable angles, and this setting can ensure that the universal joint can stably and efficiently transmit power or change angles during the rotation of the handle 2, ensuring the smoothness and stability of the operation of the lightweight jack. It can be understood that when the handle 2 swings up and down, it drives the movement of the first fork 521, but the second fork 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 Figure 1-3 In this embodiment, the drain valve 3 includes:

[0051] The drive unit 301 has its first end fixedly assembled coaxially with the second gear 503, and its second end axially positioned inside 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 to the outside of the valve cavity 101 and is axially movably connected to the second end of the drive portion 301. The free end of the second rod portion has a rectangular cross-section, and the second end of the drive portion 301 is axially provided with a rectangular positioning hole that matches the second rod portion.

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

[0054] Continue to refer to the appendix Figure 2 It also includes a handle 7, which has a plug portion 701 that is movably fitted to the free end of the presser 2. The free end of the plug portion 701 is provided with a screw-fit groove 702, and the second end of the rotating shaft 4 is formed with a screw-fit head 201 that matches and engages with the screw-fit groove 702. At least one locking bolt 6 is threadedly fitted to the presser 2 at the position corresponding to the plug portion 701. The tail of the locking bolt 6 extends into the annular groove 703 opened on the plug portion 701 to lock the presser 2 and the handle 7 together.

[0055] In this embodiment, the front end of the handle 2 is movably hinged to the pump body 10 of the oil pump, and the handle 7 is inserted into the rear end of the handle 2 and then locked and fixed to the handle 7 by the locking bolt 6 and the annular groove opened on the handle 7. Therefore, when the handle 7 is axially connected to the handle 2, the handle 7 can still rotate around its own axis. Operating the handle 7 can make the handle 2 drive the pump core 109 in the movable cavity 102 to move, drive the oil in the oil storage cavity 103 to reach the oil cylinder cavity 106 through the connected oil inlet channel 107 and the one-way valve 105 for one-way oil inlet, and then drive the lifting member to extend from the oil cylinder cavity 106 to lift the heavy object. At the same time, the handle 7 and the rotating shaft 4 form a plug-in fit. Rotating the handle 7 can drive the rotating shaft 4, the first gear 501 and the second gear 503 to rotate in sequence, thereby opening or closing the drain valve 3.

[0056] In the technical solutions of the above embodiments, combined with the appendix Figure 1-2Under normal conditions, the valve stem 302 presses down to push against the steel ball 303, and the return oil passage 104 is blocked and disconnected by the steel ball 303. When lifting, the operating handle 7 swings up and down, and the hydraulic medium in the oil storage chamber 103 can only enter the oil cylinder chamber 106 through the oil inlet passage 107 and the one-way valve 105 for one-way oil inlet passage, driving the lifting component to extend from the oil cylinder chamber 106 to lift the heavy object. Conversely, when depressurizing, the handle 7 is rotated in the opposite direction, and the rotational force of the rotating shaft 4 drives the drive part 301 to rotate in the valve chamber 101 through the relay transmission of the transmission part 5. Since the valve stem 302 and the drive part 301 are axially movable and the rotation direction is restricted, the valve stem 302 moves upward under the threaded engagement, releasing the steel ball 303, opening the return oil passage 104, and the hydraulic medium in the oil cylinder chamber 106 returns to the oil storage chamber 103 through the return oil passage 104 under pressure, and the jack resets.

[0057] In an optional embodiment (not shown in the figure), the sidewall of the second rod has at least one axially extending key, and the second end of the drive part 301 is axially provided with a movable hole that matches the second rod, and the axial sidewall of the movable hole is provided with at least one keyway that matches the key.

[0058] In another alternative embodiment (not shown in the figure), the second end of the drive unit 301 has an extension, and the annular sidewall of the extension has at least one axially extending key, and the free end of the second rod is provided with an axially opening movable hole that matches the second rod, and the axial sidewall of the movable hole is provided with at least one keyway that matches the key.

[0059] In the above two optional embodiments, only the specific axial movable connection structure between the valve stem 302 and the drive part 301 is changed, and the overall implementation of the solution is not affected. The effect is the same, and they can be used as optional replacement solutions.

[0060] Example 2

[0061] The difference between this embodiment and Embodiment 1 is that Embodiment 2 of this utility model provides a lightweight jack. For example... Figure 1 As shown, it includes the improved oil discharge mechanism of Embodiment 1 described above.

[0062] In the above embodiments, the improved oil release mechanism of the lightweight jack is used as follows:

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

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

[0065] S3. Reverse turn handle 7 to close the drain valve 3, preparing for the next lifting of the heavy object.

[0066] Other undescribed structures are described in Example 1.

[0067] In summary, the improved oil release mechanism of the lightweight jack provided by this utility model embodiment allows users to easily achieve pressure relief by simply turning the handle 7. The entire process does not require separating the handle from the lever, greatly simplifying the operation process and providing users with a convenient user experience. At the same time, the lever 2 is hinged to the oil pump body 1, eliminating the need for a wall plate, resulting in a more compact structure and reducing the overall size of the lightweight jack. Furthermore, the improved oil release mechanism eliminates the dynamic meshing state of the first gear 501 and the second gear 503, ensuring the reliability of product operation and significantly extending its service life.

[0068] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. An improved oil discharge mechanism for a lightweight jack, configured in conjunction with an oil pump body, wherein the oil pump body has at least one valve chamber, one movable chamber, one oil storage chamber, and one oil return channel, the valve chamber being located in the middle of the oil return channel and communicating with the oil return channel, and the two ends of the oil return channel respectively connecting to the oil storage chamber and the movable chamber, and a lever being movably hinged to the oil pump body, characterized in that, Also comprising: An oil drain valve arranged in the valve cavity and having a driving portion extending outside the valve cavity; A rotating shaft arranged axially in the plunger inner cavity and rotationally positioned with the plunger; A transmission member for transmitting power of the rotating shaft to drive the oil drain valve to open and close, the transmission member comprising: a first gear rotationally assembled on a base formed on one side of the oil pump body; A universal joint having two ends respectively connected to the first gear and the first end of the rotating shaft; and a second gear coaxially arranged with the driving portion and meshingly connected to the first gear.

2. The improved oil drain mechanism as claimed in claim 1 wherein, The rotating axis of the first gear and the rotating axis of the second gear have an included angle of 45°-60°.

3. The improved oil drain mechanism as claimed in claim 1 wherein, The universal joint is a cross universal joint, and the center of the universal joint is located on the rotating axis of the plunger.

4. The improved oil drain mechanism as claimed in claim 1 wherein, The universal joint comprises: A first yoke coaxially fixedly assembled with the rotating shaft; A second yoke coaxially fixedly assembled with the first gear; A cross shaft arranged between the first yoke and the second yoke to relay transmission of the first yoke and the second yoke.

5. The improved oil drain mechanism as claimed in claim 1 wherein, The oil drain valve comprises: A driving portion having a first end coaxially fixedly assembled with the second gear and a second end axially positioned in the valve cavity and rotationally assembled with the inner cavity of the valve cavity; A valve rod having a first rod portion and a second rod portion, the first rod portion being threadedly connected with the inner wall of the valve cavity, and the second rod portion extending outside the valve cavity and being axially movably connected with the second end of the driving portion; A steel ball movably arranged in the valve cavity and located at the free end of the first rod portion, wherein the diameter of the steel ball is greater than the diameter of the oil return passage to block the oil return passage when the steel ball is pushed by the valve rod.

6. The improved oil drain mechanism as claimed in claim 5, wherein, The free end of the second rod portion has a rectangular structure in cross section, and the second end of the driving portion is axially provided with a rectangular positioning hole matching the second rod portion.

7. The improved oil drain mechanism as claimed in claim 1 wherein, A handle is further provided, the handle having a plug-in portion movably assembled with the free end of the plunger, a rotation fitting groove being formed on the free end of the plug-in portion, and a rotation fitting head being formed on the second end of the rotating shaft and matched with the rotation fitting groove.

8. The improved oil drain mechanism as claimed in claim 7, wherein, At least one locking pin is threadedly assembled with the plunger at a position corresponding to the plug-in portion, and the pin tail of the locking pin extends into an annular groove formed on the plug-in portion to lock the plunger and the handle.

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