Lubrication device for pin shaft of movable arm oil cylinder and forklift loader

Abstract

The utility model belongs to the technical field of forklift loaders, and discloses a movable arm oil cylinder pin shaft lubricating device and a forklift loader. The movable arm oil cylinder pin shaft lubricating device comprises an oil cylinder mounting seat, a shaft sleeve, a first oil pipe and a second oil pipe, and the oil cylinder mounting seat is provided with a supporting hole and a first lubricating oil channel; the shaft sleeve is arranged in the supporting hole, a first annular oil groove is formed in the inner circumferential wall of the shaft sleeve, and a first oil hole is formed in the top of the shaft sleeve. The first oil pipe communicates with the first lubricating oil channel. A second lubricating oil channel is further formed in the oil cylinder mounting seat; a second oil hole is formed in the bottom of the shaft sleeve; the second oil pipe communicates with the second lubricating oil channel. Lubricating oil can flow to the top of the first annular oil groove through the first oil pipe, the first lubricating oil channel and the first oil hole so as to enter a top gap between the shaft sleeve and the pin shaft, and can flow to the bottom of the first annular oil groove through the second oil pipe, the second lubricating oil channel and the second oil hole so as to enter a bottom gap between the shaft sleeve and the pin shaft. And the problem of non-uniform lubrication of the pin shaft and the shaft sleeve is solved.

Description

Technical Field

[0001] This utility model relates to the field of forklift loading machine technology, and in particular to a boom cylinder pin lubrication device and a forklift loading machine. Background Technology

[0002] Currently, most forklifts use a centrally mounted boom cylinder, which integrates pins on both sides of the boom cylinder. These pins connect the boom cylinder to two corresponding cylinder mounting seats on the front frame. Each cylinder mounting seat on the front frame is equipped with a grease inlet to lubricate the bushing between the pin and the mounting seat. The two grease inlets on the two cylinder mounting seats are connected to the front frame wing box via steel pipes for easy grease injection.

[0003] Theoretically, the pin on the boom cylinder and the bushing on the cylinder mounting seat of the front frame are clearance fits. The inner wall of the bushing has an annular oil groove (the cross-section of the annular oil groove is semi-circular). When a certain amount of grease is applied, the pin and bushing end faces should theoretically exude oil evenly. The operator usually uses this to judge whether enough grease has been applied. However, the boom cylinder of a forklift is relatively heavy. Due to the weight of the boom cylinder, the pin on the boom cylinder is pressed tightly against the bushing, causing the pin and bushing to become eccentric. The upper clearance is larger and the lower clearance is smaller. This leads to uneven oil exude from the pin and bushing end faces when grease is applied (only the upper clearance exudes oil, while the lower clearance exudes almost no oil). In other words, the lubrication between the pin and bushing is uneven, which may lead to dry friction, abnormal noise, and over time, the bushing may even fall off, seriously affecting the user experience and reducing user satisfaction. Utility Model Content

[0004] The purpose of this utility model is to provide a lubrication device for the boom cylinder pin and a forklift.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The boom cylinder pin lubrication device includes:

[0007] The cylinder mounting base has a support hole and a first lubricating oil passage, and the first lubricating oil passage is connected to the support hole;

[0008] A bushing is disposed in the support hole. The bushing is used to rotate with the pin. A first annular oil groove is formed on the inner peripheral wall of the bushing. A first oil hole is formed on the top of the bushing. The first oil hole connects the first lubricating oil passage and the first annular oil groove.

[0009] The first oil pipe is connected to the first lubricating oil passage;

[0010] The cylinder mounting base is also provided with a second lubricating oil passage, which is connected to the support hole.

[0011] The bottom of the bushing is provided with a second oil hole, which connects the second lubricating oil passage and the first annular oil groove.

[0012] It also includes a second oil pipe, which is connected to the second lubricating oil passage.

[0013] As a preferred technical solution for the lubrication device of the boom cylinder pin, the cross-section of the first annular oil groove is rectangular.

[0014] As a preferred technical solution for the lubrication device of the boom cylinder pin, the outer peripheral wall of the bushing is provided with a second annular oil groove, which is connected to the second lubricating oil passage. The bushing is also provided with a third oil hole, which is located between the first oil hole and the second oil hole and is connected to the second annular oil groove and the first annular oil groove.

[0015] As a preferred technical solution for the lubrication device of the boom cylinder pin, there are two third oil holes, one of which is located on one side of the peripheral wall between the first oil hole and the second oil hole, and the other is located on the other side of the peripheral wall between the first oil hole and the second oil hole.

[0016] As a preferred technical solution for the lubrication device of the boom cylinder pin, the second oil hole is connected to the second lubrication oil passage through the second annular oil groove.

[0017] As a preferred technical solution for the lubrication device of the boom cylinder pin, the cross-section of the second annular oil groove is rectangular.

[0018] As a preferred technical solution for the lubrication device of the boom cylinder pin, the inner wall of the bushing is also provided with a through oil groove, which is arranged through the thickness direction of the bushing and is connected to the first annular oil groove.

[0019] As a preferred technical solution for the lubrication device of the boom cylinder pin, there are multiple through oil grooves, and each of the multiple through oil grooves corresponds one-to-one with the second oil hole and the third oil hole. The through oil grooves are connected to the corresponding second oil hole or third oil hole.

[0020] As a preferred technical solution for the lubrication device of the boom cylinder pin, the cylinder mounting base includes an upper body and a lower body, which are detachably connected. The first lubricating oil passage is opened in the upper body, and the second lubricating oil passage is opened in the lower body.

[0021] A forklift loader includes a boom cylinder, a front frame, and two boom cylinder pin lubrication devices as described in any of the above embodiments. The boom cylinder has pins on both sides, and the two boom cylinder pin lubrication devices are both mounted on the front frame. The two pins correspond one-to-one with the two boom cylinder pin lubrication devices, and the pins are rotatably engaged with the support holes in the corresponding boom cylinder pin lubrication devices.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a lubrication device for the boom cylinder pin. The lubricating oil can flow to the top of the first annular oil groove through the first oil pipe, the first lubrication oil passage and the first oil hole, thereby entering the top gap between the bushing and the pin. The lubricating oil can also flow to the bottom of the first annular oil groove through the second oil pipe, the second lubrication oil passage and the second oil hole, thereby entering the bottom gap between the bushing and the pin, thus improving the problem of uneven lubrication between the pin and the bushing.

[0024] This utility model also provides a forklift machine. By setting the above-mentioned boom cylinder pin lubrication device, the problem of uneven lubrication between the pin and the bushing can be improved, and the hidden dangers of dry friction, abnormal noise, or even bushing detachment of the boom cylinder pin can be eliminated during the operation of the whole machine. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the two boom cylinder pin lubrication devices provided in this embodiment of the present invention installed on the front frame;

[0026] Figure 2 This is a schematic diagram of the structure of the lubrication device for the two boom cylinder pins provided in this embodiment of the utility model;

[0027] Figure 3 This is a cross-sectional view of the boom cylinder pin lubrication device provided in this embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the bushing structure involved in the embodiments of this utility model;

[0029] Figure 5 This is a schematic diagram of the upper seat body involved in the embodiments of this utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the first type of lower seat involved in the embodiments of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the second type of lower seat involved in the embodiments of this utility model.

[0032] In the picture:

[0033] 100. Lubrication device for boom cylinder pin; 200. Front frame;

[0034] 10. Cylinder mounting seat; 11. Upper seat body; 111. First lubricating oil passage seat hole; 112. Oil pipe mounting seat; 1121. First lubricating oil passage; 113. First semi-support hole; 12. Lower seat body; 121. Second lubricating oil passage; 122. Second semi-support hole;

[0035] 20. Bushing; 21. First annular oil groove; 22. Second annular oil groove; 23. First oil hole; 24. Second oil hole; 25. Third oil hole; 26. Through oil groove;

[0036] 30. First oil pipe; 40. Second oil pipe. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] like Figures 1 to 7 As shown, this utility model provides a boom cylinder pin lubrication device 100, including a cylinder mounting base 10, a bushing 20, and a first oil pipe 30. The cylinder mounting base 10 has a support hole and a first lubrication oil passage 1121, which is connected to the support hole. The bushing 20 is disposed in the support hole and is used to rotate with the pin. The inner circumferential wall of the bushing 20 has a first annular oil groove 21, and the top of the bushing 20 has a first oil hole 23, which connects the first lubrication oil passage 1121 and the first annular oil groove 21. The first oil pipe 30 is connected to the first lubrication oil passage 1121. The lubricating oil can flow through the first oil pipe 30, the first lubricating oil passage 1121 and the first oil hole 23 to the top of the first annular oil groove 21, thereby entering the top gap between the bushing 20 and the pin. Because the top gap between the bushing 20 and the pin is large and the bottom gap is small, the lubricating oil that enters the top gap between the bushing 20 and the pin cannot flow smoothly to the bottom gap between the bushing 20 and the pin.

[0042] To address the aforementioned problems, the boom cylinder pin lubrication device 100 provided by this utility model includes a second lubrication oil passage 121 on the cylinder mounting base 10, which is connected to the support hole; a second oil hole 24 is provided at the bottom of the bushing 20, which connects the second lubrication oil passage 121 and the first annular oil groove 21; and a second oil pipe 40 is also included, which is connected to the second lubrication oil passage 121. Lubricating oil can flow through the second oil pipe 40, the second lubrication oil passage 121, and the second oil hole 24 to the bottom of the first annular oil groove 21, thereby entering the bottom gap between the bushing 20 and the pin, thus improving the problem of uneven lubrication between the pin and the bushing 20, and eliminating the potential hazards of dry friction, abnormal noise, or even bushing 20 detachment during machine operation.

[0043] Reference Figure 4 In this embodiment, the cross-section of the first annular oil groove 21 is rectangular, and the width of the first annular oil groove 21 is widened so that the lubricating oil entering the gap between the bushing 20 and the top of the pin through the first oil pipe 30 can flow to the bottom gap between the bushing 20 and the pin.

[0044] Furthermore, a second annular oil groove 22 is formed on the outer peripheral wall of the bushing 20. The second annular oil groove 22 is connected to the second lubricating oil passage 121. A third oil hole 25 is also formed on the bushing 20. The third oil hole 25 is located between the first oil hole 23 and the second oil hole 24, and the third oil hole 25 connects the second annular oil groove 22 and the first annular oil groove 21. The second oil hole 24 is connected to the second lubricating oil passage 121 through the second annular oil groove 22. Lubricating oil enters the second annular oil groove 22 through the second oil pipe 40 and the second lubricating oil passage 121. Part of the lubricating oil in the second annular oil groove 22 enters the bottom of the first annular oil groove 21 through the second oil hole 24, and the other part goes up along the second annular oil groove 22 and enters the middle of the first annular oil groove 21 through the third oil hole 25, further improving the problem of uneven lubrication between the pin and the bushing 20.

[0045] In this embodiment, the cross-section of the second annular oil groove 22 is rectangular, but it can also be other shapes, and is not limited to this embodiment.

[0046] In this embodiment, there are two third oil holes 25. One third oil hole 25 is located on one side of the peripheral wall between the first oil hole 23 and the second oil hole 24, and the other third oil hole 25 is located on the other side of the peripheral wall between the first oil hole 23 and the second oil hole 24. The lubricating oil of the second annular oil groove 22 can enter the middle of both sides of the first annular oil groove 21 through the two third oil holes 25, further improving the uniformity of lubrication between the pin and the bushing 20. In other embodiments, the number of third oil holes 25 may be more than two, with several third oil holes 25 located on one side of the peripheral wall between the first oil hole 23 and the second oil hole 24, and the remaining third oil holes 25 located on the other side of the peripheral wall between the first oil hole 23 and the second oil hole 24. The number of third oil holes 25 is not limited to this embodiment.

[0047] Furthermore, the inner wall of the bushing 20 is provided with a through oil groove 26, which extends along the thickness direction of the bushing 20 and is connected to the first annular oil groove 21. The lubricating oil in the first annular oil groove 21 can flow through the through oil groove 26 to both ends of the bushing 20 along the thickness direction, so as to lubricate the bushing 20 and the pin from the ends, further improving the uniformity of lubrication between the pin and the bushing 20.

[0048] In this embodiment, there are multiple through-holes 26, each corresponding to a second oil hole 24 and a third oil hole 25, and the through-holes 26 are connected to the corresponding second oil hole 24 or third oil hole 25. Lubricating oil enters the first annular oil groove 21 through the second oil hole 24 or third oil hole 25 and simultaneously enters the through-holes 26, improving the smoothness of lubricating oil entering the through-holes 26 and increasing lubrication between the bushing 20 and the bottom and middle of the pin, further improving the uniformity of lubrication between the pin and the bushing 20. For example, there are three through-holes 26, each corresponding to a second oil hole 24 and two third oil holes 25.

[0049] Reference Figures 5 to 7 In this embodiment, the cylinder mounting base 10 includes an upper base 11 and a lower base 12, which are detachably connected to facilitate the disassembly, assembly, and maintenance of the bushing 20. The upper base 11 is provided with a first half-support hole 113, and the lower base 12 is provided with a second half-support hole 122. The first half-support hole 113 and the second half-support hole 122 together form a support hole.

[0050] Reference Figure 5 and combined Figure 3 The upper body 11 has a seat hole, and an oil pipe mounting seat 112 is installed in the seat hole. The oil pipe mounting seat 112 is inserted into the first oil hole 23. The first lubricating oil passage 1121 is provided through the oil pipe mounting seat 112 and is connected to the first oil hole 23. (Refer to...) Figure 6 and Figure 7 The second lubrication channel 121 is opened in the lower seat body 12.

[0051] Reference Figure 1 and Figure 2 This utility model also provides a forklift, including a boom cylinder, a front frame 200, and two boom cylinder pin lubrication devices 100. The boom cylinder has pins on both sides. The two boom cylinder pin lubrication devices 100 are both located on the front frame 200 and are spaced apart along a first direction. Each pin corresponds to one boom cylinder pin lubrication device 100, and the pins are rotatably engaged with the support holes in the corresponding boom cylinder pin lubrication devices 100. By providing the aforementioned boom cylinder pin lubrication devices 100, the problem of uneven lubrication between the pins and bushings 20 can be improved, eliminating the risk of dry friction, abnormal noise, or even bushing 20 detachment during machine operation.

[0052] In this embodiment, the inlet positions of the second lubricating oil passages 121 on the two cylinder mounting seats 10 are different. Specifically, the inlet of the second lubricating oil passage 121 on the outer cylinder mounting seat 10 is located on the end face away from the other cylinder mounting seat 10 along the first direction. (Refer to...) Figure 7The inlet of the second lubrication passage 121 on the inner cylinder mounting seat 10 is located on the end face away from the front frame 200 wing box along the second direction, as shown in the reference. Figure 6 The second direction is perpendicular to the first direction. Of course, the inlet position of the second lubrication oil passage 121 on the two cylinder mounting seats 10 is not limited to this embodiment, but is determined according to the installation position of other components on the front frame 200 and the direction of the second oil pipe 40.

[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. Lubrication device for boom cylinder pin, including: The cylinder mounting base (10) has a support hole and a first lubricating oil passage (1121), and the first lubricating oil passage (1121) is connected to the support hole; A bushing (20) is disposed in the support hole. The bushing (20) is used to rotate with the pin. The inner circumferential wall of the bushing (20) is provided with a first annular oil groove (21). The top of the bushing (20) is provided with a first oil hole (23). The first oil hole (23) connects the first lubricating oil passage (1121) and the first annular oil groove (21). The first oil pipe (30) is connected to the first lubricating oil passage (1121); Its features are, The cylinder mounting base (10) is also provided with a second lubricating oil passage (121), which is connected to the support hole; The bottom of the bushing (20) is provided with a second oil hole (24), which connects the second lubricating oil passage (121) and the first annular oil groove (21); It also includes a second oil pipe (40), which is connected to the second lubricating oil passage (121).

2. The boom cylinder pin lubrication device according to claim 1, characterized in that, The first annular oil groove (21) has a rectangular cross-section.

3. The boom cylinder pin lubrication device according to claim 1, characterized in that, The bushing (20) has a second annular oil groove (22) on its outer peripheral wall. The second annular oil groove (22) is connected to the second lubricating oil passage (121). The bushing (20) also has a third oil hole (25) located between the first oil hole (23) and the second oil hole (24). The third oil hole (25) connects the second annular oil groove (22) and the first annular oil groove (21).

4. The boom cylinder pin lubrication device according to claim 3, characterized in that, There are two third oil holes (25), one of which is located on one side of the peripheral wall between the first oil hole (23) and the second oil hole (24), and the other is located on the other side of the peripheral wall between the first oil hole (23) and the second oil hole (24).

5. The boom cylinder pin lubrication device according to claim 3, characterized in that, The second oil hole (24) is connected to the second lubricating oil passage (121) through the second annular oil groove (22).

6. The boom cylinder pin lubrication device according to claim 3, characterized in that, The cross-section of the second annular oil groove (22) is rectangular.

7. The boom cylinder pin lubrication device according to claim 1, characterized in that, The inner wall of the bushing (20) is also provided with a through oil groove (26), which is provided through the bushing (20) along the thickness direction and is connected to the first annular oil groove (21).

8. The boom cylinder pin lubrication device according to claim 7, characterized in that, There are multiple through oil grooves (26), and each through oil groove (26) corresponds to the second oil hole (24) and the third oil hole (25). The through oil groove (26) is connected to the corresponding second oil hole (24) or third oil hole (25).

9. The boom cylinder pin lubrication device according to any one of claims 1-8, characterized in that, The cylinder mounting base (10) includes an upper body (11) and a lower body (12), which are detachably connected. The first lubricating oil passage (1121) is opened in the upper body (11), and the second lubricating oil passage (121) is opened in the lower body (12).

10. A forklift loading machine, characterized in that, The device includes a boom cylinder, a front frame (200), and two boom cylinder pin lubrication devices (100) as described in any one of claims 1-9. The boom cylinder has pins on both sides, and the two boom cylinder pin lubrication devices (100) are both mounted on the front frame (200). The two pins correspond one-to-one with the two boom cylinder pin lubrication devices (100), and the pins are rotatably engaged with the support holes in the corresponding boom cylinder pin lubrication devices (100).

Images