A quick-release low-torque steering column assembly for a forklift

Abstract

A quick-release low-torque steering column assembly for a forklift, disclosed by the present invention, comprises a steering column body and a locking mechanism for connecting the steering column body and a vehicle body truss. The locking mechanism has a clamping portion that clamps the steering column body in a releasable manner. The clamping portion has a first abutting surface and a second abutting surface that are symmetrically arranged. The first abutting surface and the second abutting surface can abut against the circumferential surface of the steering column body in the radial direction. In the working state, the first abutting surface and the second abutting surface move relative to each other to clamp the steering column body. By means of the locking mechanism, the present invention fixes the steering column body and the vehicle body truss in a releasable manner, and the force on the steering column body is evenly distributed, so that the steering column body will not be deformed due to unilateral force and the action of vehicle body vibration, solving the problem that the existing method of fixing the steering column body by bolts is inconvenient for disassembly.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle steering systems, and more particularly to a quick-release low-torque steering column assembly for forklifts. Background Art

[0002] The steering column is an important part of the motor vehicle steering system. The adjustment system of the steering column includes components such as the steering column, upper bracket, clamping bracket, and handle assembly. When adjusting the height of the vehicle steering column, the handle in the handle assembly is opened, and the clamping force of components such as the upper bracket and the clamping bracket on the steering column will decrease, so that the steering column can be adjusted. According to the working principle of the product, it can be divided into two types: mechanical and electric power-assisted steering columns. It is mainly used to control the driving direction of the vehicle, transmit torque, and absorb the energy when the vehicle collides. Since the steering column is responsible for torque transmission, it is required to be firmly connected to the vehicle body. The traditional steering column is tightly connected to the vehicle body by welding, resulting in the inability to disassemble the steering column, which is inconvenient for later maintenance.

[0003] Chinese Patent CN216102347U discloses an installation structure of a bus steering column. One end of the lower transverse column support fixed beam is connected to the vehicle body truss, the other end of the lower transverse column support fixed beam is connected to the longitudinal column support fixed beam, the upper end of the longitudinal column support fixed beam is connected to the upper transverse column support fixed beam, the upper part of the upper transverse column support fixed beam is installed with the top column support fixed beam, the upper transverse column support fixed beam and the top column support fixed beam are connected to the front panel skeleton cross beam, the steering column welding bracket is connected through the top column support fixed beam, and the steering column is connected to the steering column welding bracket by bolts.

[0004] This steering column installation structure still fixes the steering column with bolts, which is inconvenient for the staff to disassemble in a narrow disassembly environment, and the disassembly efficiency is low. Summary of the Invention

[0005] In view of the above problems, a quick-release low-torque steering column assembly for forklifts is provided. The steering column body is fixed in a releasable manner through a locking mechanism, and the force on the steering column body is uniform, and it will not deform due to unilateral force, solving the problem of inconvenient disassembly of the existing rotating column body fixed by bolts.

[0006] To solve the problems of the prior art, the present invention provides a quick-release low-torque steering column assembly for a forklift, which includes a steering column body and a locking mechanism for connecting the steering column body and the vehicle body truss. The locking mechanism has a clamping portion that clamps the steering column body in a releasable manner. The clamping portion has a first abutting surface and a second abutting surface that are symmetrically arranged. The first abutting surface and the second abutting surface can abut against the circumferential surface of the steering column body in the radial direction. In the working state, the first abutting surface and the second abutting surface move relative to each other to clamp the steering column body.

[0007] Preferably, the locking mechanism includes a mounting bracket, a locking driving member, a first abutting block, a second abutting block, a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. The mounting bracket includes a first connecting plate connected to the vehicle body truss and side plates parallelly arranged on both sides of the first connecting plate. The locking driving member is arranged between the two side plates and close to the first connecting plate, and the locking driving member has an execution portion that can approach or move away from the first connecting plate; the first abutting block and the second abutting block are symmetrically arranged between the two side plates, and the symmetry of the first abutting block and the second abutting block has a clamping groove for clamping the steering column body. On the side of the first abutting block facing away from the second abutting block, a parallel first pin and a second pin are arranged. On the side of the second abutting block facing away from the first abutting block, a parallel third pin and a fourth pin are arranged; both ends of the first connecting rod are respectively rotatably connected to the first pin and the adjacent side plate, both ends of the second connecting rod are respectively rotatably connected to the second pin and the adjacent side plate, and the first connecting rod and the second connecting rod are parallelly arranged; both ends of the third connecting rod are respectively rotatably connected to the third pin and the adjacent side plate, both ends of the fourth connecting rod are respectively rotatably connected to the fourth pin and the adjacent side plate, the third connecting rod and the fourth connecting rod are parallelly arranged, and both the first connecting rod and the third connecting rod are rotatably connected to the execution portion of the locking driving member.

[0008] Preferably, the locking driving member includes a rotating rod, a first smooth rod, a first lifting frame, a second lifting frame, a first spring, a first driving connecting rod, a second driving connecting rod, and a cam. The rotating rod is rotatably arranged between the two side plates; two first smooth rods are arranged vertically on the inner sides of the two side plates; the first lifting frame and the second lifting frame are respectively slidably arranged on the two first smooth rods, and the first spring is sleeved on the first smooth rod; both ends of the first driving connecting rod are respectively rotatably connected to the first lifting frame and the first pin, and both ends of the second driving connecting rod are respectively rotatably connected to the second lifting frame and the third pin; two cams are fixedly arranged on the rotating rod, and the two cams respectively abut against the tops of the first lifting frame and the second lifting frame.

[0009] Preferably, the locking driving member further includes a lifting plate and a disc spring. The two lifting plates are slidably arranged on the tops of the first lifting frame and the second lifting frame in the vertical direction. The first optical rod penetrates through the lifting plate and is slidably matched with it. The disc spring is sleeved on the first optical rod. A limiting plate extending longitudinally is arranged at the top end of the lifting plate. When the end of the cam abuts between the limiting plate and the lifting plate, the first abutting block and the second abutting block clamp the steering column body.

[0010] Preferably, an avoidance groove is arranged at the end of the cam. The cam can abut against the first optical rod through the avoidance groove so that the first lifting frame and the second lifting frame can rise in the vertical direction.

[0011] Preferably, a dial rod is arranged at one end of the rotating rod. The dial rod extends in a direction perpendicular to the rotating rod.

[0012] Preferably, the rotating column assembly further includes a limiting mechanism for restricting the rotation of the cam. The limiting mechanism is arranged outside the side plate. A sliding hole is arranged on the side plate. The limiting mechanism has a limiting pin that can slide in the sliding hole. When the forklift starts and generates vibration, the limiting pin extends out of the sliding hole to abut against one side of the cam.

[0013] Preferably, the limiting mechanism further includes a second mounting bracket, a first sliding block, a second sliding block, a ball, a first pushing block, a second pushing block, a first elastic member, a second elastic member and a positioning pin. The second mounting bracket is arranged on the outside of the side plate. The second mounting bracket includes two support plates perpendicular to the side plate and a second connecting plate connecting the two support plates. The first sliding block and the second sliding block are arranged on the inner side of the second connecting plate to slide towards or away from each other. Four-sided grooves are arranged on the opposite sides of the first sliding block and the second sliding block. Outer inclined surfaces facing the support plates are arranged on the opposite sides of the first sliding block and the second sliding block. The ball is arranged in the four-sided groove. The first pushing block and the second pushing block are arranged on the inner side of the support plate to slide along the length direction of the support plate. The first pushing block is slidably matched with the outer inclined surface of the first sliding block, and the second pushing block is slidably matched with the outer inclined surface of the second sliding block. The first elastic member elastically connects the side plate and the first pushing block, and the second elastic member elastically connects the side plate and the second pushing block. The positioning pin is arranged on the first pushing block and the second pushing block and is connected with the limiting pin.

[0014] Preferably, the limiting mechanism further includes a positioning ring which is coaxially screwed onto the limiting pin. Two limiting grooves extending along the axial direction thereof are provided on the circumferential surface of the limiting pin. There are two positioning pins which are respectively arranged on the first pushing block and the second pushing block, and the ends of the two positioning pins are slidably arranged in the limiting grooves and abutted against the end face of the positioning ring.

[0015] Preferably, the first elastic member and the second elastic member have the same structure. The first elastic member includes a second optical rod and a second spring. The second optical rod is arranged inside the support plate, passes through the first pushing block and is in sliding fit with it. The second spring is sleeved on the second optical rod, and the second spring is located between the side plate and the first pushing block.

[0016] The beneficial effects of the present invention compared with the prior art are as follows:

[0017] 1. The present invention fixes the steering column body to the vehicle body truss in a releasable manner through the locking mechanism, and the force on the steering column body is uniform, and it will not deform due to unilateral force and the action of vehicle body vibration, solving the problem that the existing steering column body is inconvenient to disassemble by bolt fixing.

[0018] 2. The present invention has a limiting mechanism that can self-limit the cam after the vehicle body starts to vibrate, so that the cam cannot rotate due to vibration after the vehicle body starts, enabling the first abutting block and the second abutting block to stably hold the steering column body, with higher safety. Description of the Drawings

[0019] Figure 1 is a perspective view of a quick-release low-torque steering column assembly for a forklift.

[0020] Figure 2 is a perspective view of the locking mechanism in a quick-release low-torque steering column assembly for a forklift.

[0021] Figure 3 is a front view of the locking mechanism in a quick-release low-torque steering column assembly for a forklift.

[0022] Figure 4 is Figure 3 a cross-sectional view taken along the A-A section of

[0023] Figure 5 is Figure 3 a cross-sectional view taken along the B-B section of

[0024] Figure 6 is a perspective view of the locking mechanism in a quick-release low-torque steering column assembly for a forklift from the first perspective after removing the first mounting bracket.

[0025] Figure 7 It is a perspective view of the locking mechanism in a quick-release low-torque steering column assembly for a forklift after removing the first mounting bracket from a second perspective.

[0026] Figure 8 It is Figure 7 A partial enlarged view of part C of

[0027] Figure 9 It is a perspective view of the limiting mechanism in a quick-release low-torque steering column assembly for a forklift.

[0028] Figure 10 It is an exploded perspective view of the limiting mechanism in a quick-release low-torque steering column assembly for a forklift.

[0029] In the figure, the reference numerals are: 1 - steering column body; 2 - locking mechanism; 21 - first mounting bracket; 221 - rotating rod; 2211 - lever; 222 - first optical rod; 2231 - first lifting frame; 2232 - second lifting frame; 224 - first spring; 225 - first driving link; 226 - second driving link; 227 - cam; 2271 - avoidance groove; 228 - lifting plate; 2281 - limiting plate; 229 - disc spring; 23 - first abutting block; 231 - first pin; 232 - second pin; 24 - second abutting block; 241 - third pin; 242 - fourth pin; 25 - first link; 26 - second link; 27 - third link; 28 - fourth link; 3 - limiting mechanism; 31 - limiting pin; 311 - limiting groove; 32 - second mounting bracket; 331 - first sliding block; 332 - second sliding block; 34 - ball; 351 - first pushing block; 352 - second pushing block; 361 - second optical rod; 362 - second spring; 37 - second elastic member; 38 - positioning pin; 39 - positioning ring. Detailed implementation manners

[0030] To further understand the features, technical means, specific purposes, and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0031] As Figure 1 , Figure 2 and Figure 3 shown, the present invention provides:

[0032] A quick-release low-torque steering column assembly for a forklift, comprising a steering column body 1 and a locking mechanism 2 for connecting the steering column body 1 and the vehicle body truss. The locking mechanism 2 has a clamping portion that releasably clamps the steering column body 1. The clamping portion has a first abutting surface and a second abutting surface that are symmetrically arranged. The first abutting surface and the second abutting surface can abut against the circumferential surface of the steering column body 1 in the radial direction. In the working state, the first abutting surface and the second abutting surface move relative to each other to clamp the steering column body 1.

[0033] The steering column body 1 and the locking mechanism 2 form a steering column assembly. The locking mechanism 2 is fixedly connected to the vehicle body truss in advance, so that the steering column body 1 passes through the clamping portion, and the first abutting surface and the second abutting surface are symmetrically arranged on both sides of the steering column body 1. The locking mechanism 2 is activated, so that the clamping portion can clamp the steering column body 1, and the first abutting surface and the second abutting surface abut against the outer surface of the steering column body 1 in the radial direction, thereby fixedly connecting the steering column body 1 and the vehicle body truss. The steering column body 1 is stressed on both sides, and thus it can prevent the steering column body 1 from being stressed unidirectionally and bending under the action of vehicle body vibration.

[0034] In this embodiment, the steering column body 1 is fixedly connected to the vehicle body truss by the locking mechanism in a releasable manner, and the stress on the steering column body 1 is uniform, and it will not be deformed due to unidirectional stress and under the action of vehicle body vibration, solving the problem that the existing steering column body 1 is inconvenient to disassemble by being fixed with bolts.

[0035] Such as Figure 3 and Figure 4As shown in the figure, the locking mechanism 2 includes a mounting bracket, a locking driving member, a first abutting block 23, a second abutting block 24, a first connecting rod 25, a second connecting rod 26, a third connecting rod 27 and a fourth connecting rod 28. The mounting bracket includes a first connecting plate connected to the vehicle body truss, and side plates parallelly arranged on both sides of the first connecting plate. The locking driving member is arranged between the two side plates and close to the first connecting plate, and the locking driving member has an actuating portion that can approach or move away from the first connecting plate; the first abutting block 23 and the second abutting block 24 are symmetrically arranged between the two side plates, and the symmetry of the first abutting block 23 and the second abutting block 24 has a clamping groove for clamping the steering column body 1. On the side of the first abutting block 23 facing away from the second abutting block 24, parallel first pin 231 and second pin 232 are arranged. On the side of the second abutting block 24 facing away from the first abutting block 23, parallel third pin 241 and fourth pin 242 are arranged; both ends of the first connecting rod 25 are respectively rotatably connected to the first pin 231 and the adjacent side plate, both ends of the second connecting rod 26 are respectively rotatably connected to the second pin 232 and the adjacent side plate, and the first connecting rod 25 and the second connecting rod 26 are arranged in parallel; both ends of the third connecting rod 27 are respectively rotatably connected to the third pin 241 and the adjacent side plate, both ends of the fourth connecting rod 28 are respectively rotatably connected to the fourth pin 242 and the adjacent side plate, the third connecting rod 27 and the fourth connecting rod 28 are arranged in parallel, and both the first connecting rod 25 and the third connecting rod 27 are rotatably connected to the actuating portion of the locking driving member.

[0036] When it is necessary to fix the steering column body 1, start the locking driving member so that the actuating portion of the steering column body 1 can move away from the first connecting plate. Since both the first connecting rod 25 and the third connecting rod 27 are rotatably connected to the actuating portion of the locking driving member, the first connecting rod 25 can rotate relative to the adjacent side plate. Because the second connecting rod 26 is arranged in parallel with the first connecting rod 25, and the first connecting rod 25 is rotatably connected to the first pin 231 and the side plate, and the second connecting rod 26 is rotatably connected to the second pin 232 and the side plate, the first abutting block 23 deflects inside the adjacent side plate, and then the first abutting block 23 abuts against the outer surface of the steering column body 1 in the radial direction; at the same time, the third connecting rod 27 can rotate relative to the adjacent side plate. Because the fourth connecting rod 28 is arranged in parallel with the third connecting rod 27, and the third connecting rod 27 is rotatably connected to the third pin 241 and the side plate, and the fourth connecting rod 28 is rotatably connected to the fourth pin 242 and the side plate, the second abutting block 24 deflects inside the adjacent side plate, and then the second abutting block 24 abuts against the outer surface of the steering column body 1 in the radial direction.

[0037] Under the mutual acting force of the first abutting block 23 and the second abutting block 24, the steering column body 1 is fixed.

[0038] As Figure 4 、 Figure 6 and Figure 7 shown, the locking driving member includes a rotating rod 221, a first optical rod 222, a first lifting frame 2231, a second lifting frame 2232, a first spring 224, a first driving link 225, a second driving link 226, and a cam 227. The rotating rod 221 is rotatably arranged between two side plates; two first optical rods 222 are arranged vertically on the inner sides of the two side plates; the first lifting frame 2231 and the second lifting frame 2232 are respectively slidably arranged on the two first optical rods 222, and the first spring 224 is sleeved on the first optical rod 222; two ends of the first driving link 225 are respectively rotatably connected to the first lifting frame 2231 and the first pin 231, and two ends of the second driving link 226 are respectively rotatably connected to the second lifting frame 2232 and the third pin 241; two cams 227 are fixedly arranged on the rotating rod 221, and the two cams 227 respectively abut against the tops of the first lifting frame 2231 and the second lifting frame 2232.

[0039] The cam 227 has a mounting portion fixedly connected coaxially with the rotating rod 221, and an extension portion extending radially along the mounting portion. In the initial state, the extension portions of the two cams 227 respectively abut against the tops of the first lifting frame 2231 and the second lifting frame 2232, so that the first lifting frame 2231 and the second lifting frame 2232 compress the first spring 224 and move away from the connecting plate, thereby enabling the first driving link 225 and the second driving link 226 to drive the first abutting block 23 and the second abutting block 24 to clamp the steering column body 1. When it is necessary to release the locking of the steering column body 1, rotate the rotating rod 221, so that the mounting portion of the cam 227 drives its extension portion to rotate, thereby enabling the first lifting plate 228 and the second lifting plate 228 to abut against the circumferential surface of the mounting portion of the cam 227 under the action of the first spring 224, so that the first lifting plate 228 and the second lifting plate 228 approach the connecting plate, and the first driving link 225 and the second driving link 226 respectively drive the first abutting block 23 and the second abutting block 24 to expand to release the steering column body 1.

[0040] The sliding directions of the first lifting frame 2231 and the second lifting frame 2232 can be stably constrained by the optical rod, thereby preventing the first lifting frame 2231 and the second lifting frame 2232 from separating from the first mounting bracket.

[0041] As Figure 4As shown, the locking driving member further includes a lifting plate 228 and a disc spring 229. Two lifting plates 228 are slidably arranged on the tops of the first lifting frame 2231 and the second lifting frame 2232 in the vertical direction. The first optical rod 222 penetrates through the lifting plate 228 and is slidably engaged with it. The disc spring 229 is sleeved on the first optical rod 222. A limiting plate 2281 extending longitudinally is arranged at the top end of the lifting plate 228. When the end of the cam 227 abuts between the limiting plate 2281 and the lifting plate 228, the first abutting block 23 and the second abutting block 24 clamp the steering column body 1.

[0042] In the locked state, the extending portion of the cam 227 is tangent to the limiting plate 2281 and the lifting plate 228, so that the extending portion of the cam 227 is clamped between the limiting plate 2281 and the lifting plate 228, thereby preventing the first lifting frame 2231 and the second lifting frame 2232 from approaching the connecting plate under the action of the first spring 224. When the rotating rod 221 is rotated, the lifting plate 228 overcomes the elastic force of the disc spring 229 and approaches the adjacent first lifting frame 2231 or second lifting frame 2232, so that the extending portion of the cam 227 can withdraw from the right-angle groove of the limiting plate 2281 and the lifting plate 228, and then the first lifting frame 2231 and the second lifting frame 2232 can abut against the mounting portion of the cam 227 under the action of the first spring 224, so that the first driving link 225 and the second driving link 226 can drive the first abutting block 23 and the second abutting block 24 to expand respectively to loosen the steering column body 1.

[0043] As Figure 4 and Figure 8 shown, an avoidance groove 2271 is arranged at the end of the cam 227. The cam 227 can abut against the first optical rod 222 through the avoidance groove 2271 so that the first lifting frame 2231 and the second lifting frame 2232 can rise in the vertical direction.

[0044] By arranging the avoidance groove 2271 at the extending portion of the cam 227, when the cam 227 rotates to separate its extending portion from the tops of the first lifting frame 2231 and the second lifting frame 2232, the avoidance groove 2271 can just be clamped on the optical rod, so that the cam 227 can rotate normally, so that the first lifting frame 2231 and the second lifting frame 2232 can abut against the mounting portion of the cam 227.

[0045] As Figure 6 and Figure 7 shown, a dial rod 2211 is arranged at one end of the rotating rod 221. The dial rod 2211 extends in a direction perpendicular to the rotating rod 221.

[0046] By providing a lever 2211 perpendicular to one end of the rotating rod 221 and extending the lever 2211 into the installation environment, the staff can rotate the lever 2211 outside the installation environment to adjust the angle of the rotating rod 221, making the operation more convenient.

[0047] As Figure 8 shown, the rotating pipe column assembly further includes a limiting mechanism 3 for restricting the rotation of the cam 227. The limiting mechanism 3 is arranged outside the side plate. A sliding hole is provided on the side plate. The limiting mechanism 3 has a limiting pin 31 that can slide in the sliding hole. When the forklift starts and vibrates, the limiting pin 31 extends out of the sliding hole to abut against one side of the cam 227.

[0048] When the extension of the cam 227 is stuck in the vertical groove of the limiting plate 2281 and the lifting plate 228, when the vehicle body vibrates, the extension of the cam 227 is very likely to exit from the vertical groove. To improve the stability of the steering column body 1 being clamped, a limiting mechanism 3 is provided on one side of the first mounting bracket 21. When the vehicle body starts and vibrates, the limiting pin 31 in the limiting mechanism 3 can extend out of the sliding hole and abut against one side of the extension of the cam 227, so that the extension of the cam 227 is located between the limiting plate 2281 and the limiting pin 31, thereby stably clamping the steering column body 1. When the vehicle body is stationary and the steering column body 1 needs to be slid, the limiting pin 31 can reset itself from one side of the cam 227, thereby releasing the locking of the cam 227, so that the cam 227 can be rotated to release the steering column body 1.

[0049] In this embodiment, a limiting mechanism 3 that can self-limit the cam 227 after the vehicle body starts and vibrates is provided, so that the cam 227 cannot rotate due to vibration after the vehicle body starts, enabling the first abutting block 23 and the second abutting block 24 to stably hold the steering column body 1, with higher safety.

[0050] As Figure 5 、 Figure 9 and Figure 10As shown, the limiting mechanism 3 further includes a second mounting bracket 32, a first sliding block 331, a second sliding block 332, a ball 34, a first pushing block 351, a second pushing block 352, a first elastic member, a second elastic member 37 and a positioning pin 38. The second mounting bracket 32 is disposed on the outside of the side plate. The second mounting bracket 32 includes two support plates perpendicular to the side plate and a second connecting plate connecting the two support plates. The first sliding block 331 and the second sliding block 332 are arranged to slide towards or away from each other on the inner side of the second connecting plate. Four-sided grooves are provided on the opposite sides of the first sliding block 331 and the second sliding block 332. Outer inclined surfaces facing the support plates are provided on the opposite sides of the first sliding block 331 and the second sliding block 332. The ball 34 is disposed in the four-sided groove. The first pushing block 351 and the second pushing block 352 are arranged to slide along the length direction of the support plate on the inner side of the support plate. The first pushing block 351 is in sliding fit with the outer inclined surface of the first sliding block 331, and the second pushing block 352 is in sliding fit with the outer inclined surface of the second sliding block 332. The first elastic member elastically connects the side plate and the first pushing block 351, and the second elastic member 37 elastically connects the side plate and the second pushing block 352. The positioning pin 38 is disposed on the first pushing block 351 and the second pushing block 352 and is connected to the limiting pin 31.

[0051] After the vehicle body starts, vibrations will occur. The ball 34 is disposed in the four-sided grooves on the opposite sides of the first sliding block 331 and the second sliding block 332. The four-sided groove has four inclined surfaces. Therefore, when the ball 34 is affected by vibrations in any direction, a force on the inclined surface of the four-sided groove will be generated, causing the first sliding block 331 and the second sliding block 332 to separate under this force. Since the outer inclined surface of the first sliding block 331 is in sliding fit with the first pushing block 351 and the outer inclined surface of the second sliding block 332 is in sliding fit with the second pushing block 352, the first pushing block 351 overcomes the elastic force of the first elastic member, and the second pushing block 352 overcomes the elastic force of the second elastic member 37 to drive the limiting pin 31 through the positioning pin 38 to limit the extension of the cam 227.

[0052] When the vehicle body is stationary, the ball 34 is stationary. The first pushing block 351 is reset under the action of the first elastic member, and the second pushing block 352 is reset under the action of the second elastic member 37, so that the limiting pin 31 releases the limit on the extension of the cam 227.

[0053] As Figure 5 and Figure 9As shown, the limiting mechanism 3 further includes a positioning ring 39 which is coaxially screwed onto the limiting pin 31. Two limiting grooves 311 extending along the axial direction thereof are provided on the circumferential surface of the limiting pin 31. There are two positioning pins 38 which are respectively arranged on the first pushing block 351 and the second pushing block 352. The ends of the two positioning pins 38 are slidably arranged in the limiting grooves 311 and abut against the end face of the positioning ring 39.

[0054] By coaxially arranging the positioning ring 39 on the limiting pin 31 and arranging the ends of the two positioning pins 38 in the limiting grooves 311 and abutting against the end of the positioning ring 39, no matter whether the first pushing block or the second pushing block 352 moves, the limiting pin 31 can be pushed through the positioning pin 38 connected thereto to limit the cam 227.

[0055] As Figure 5 and Figure 10 shown, the first elastic member and the second elastic member 37 have the same structure. The first elastic member includes a second smooth rod 361 and a second spring 362. The second smooth rod 361 is arranged inside the support plate. The second smooth rod 361 penetrates through the first pushing block 351 and is in sliding fit therewith. The second spring 362 is sleeved on the second smooth rod 361. The second spring 362 is located between the side plate and the first pushing block 351.

[0056] The second smooth rod 361 can stably arrange the first pushing block 351 in the second mounting bracket 32. The second spring 362 can drive the first pushing block 351 to reset when the vehicle body is stationary, so as to release the limit of the limiting pin 31 on the cam 227.

[0057] The above embodiments only represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A quick-release low-torque steering column assembly for a forklift, characterized in that, It includes a steering column body (1) and a locking mechanism (2) for connecting the steering column body (1) and the body truss. The locking mechanism (2) has a clamping portion that clampingly holds the steering column body (1) in a releasable manner. The clamping portion has a symmetrically arranged first abutting surface and a second abutting surface, and the first abutting surface and the second abutting surface can abut against the circumferential surface of the steering column body (1) in the radial direction. In the working state, the first abutting surface and the second abutting surface move relative to each other to clamp the steering column body (1). The locking mechanism (2) includes a mounting bracket, a locking driving member, a first abutting block (23), a second abutting block (24), a first connecting rod (25), a second connecting rod (26), a third connecting rod (27) and a fourth connecting rod (28). The mounting bracket includes a first connecting plate connected to the body truss and side plates arranged in parallel on both sides of the first connecting plate. The locking driving member is arranged between the two side plates and close to the first connecting plate, and the locking driving member has an actuating portion that can approach or move away from the first connecting plate. The first abutting block (23) and the second abutting block (24) are symmetrically arranged between the two side plates. The symmetry of the first abutting block (23) and the second abutting block (24) has a clamping groove for clamping the steering column body (1). On the side of the first abutting block (23) facing away from the second abutting block (24), there are parallel first pin (231) and second pin (232). On the side of the second abutting block (24) facing away from the first abutting block (23), there are parallel third pin (241) and fourth pin (242). The two ends of the first connecting rod (25) are respectively rotatably connected to the first pin (231) and the adjacent side plate. The two ends of the second connecting rod (26) are respectively rotatably connected to the second pin (232) and the adjacent side plate. The first connecting rod (25) and the second connecting rod (26) are arranged in parallel. The two ends of the third connecting rod (27) are respectively rotatably connected to the third pin (241) and the adjacent side plate. The two ends of the fourth connecting rod (28) are respectively rotatably connected to the fourth pin (242) and the adjacent side plate. The third connecting rod (27) and the fourth connecting rod (28) are arranged in parallel. Both the first connecting rod (25) and the third connecting rod (27) are rotatably connected to the actuating portion of the locking driving member.

2. The quick-release low-torque steering column assembly for a forklift according to claim 1, characterized in that, The locking driving member includes a rotating rod (221), a first optical rod (222), a first lifting frame (2231), a second lifting frame (2232), a first spring (224), a first driving link (225), a second driving link (226) and a cam (227). The rotating rod (221) is rotatably arranged between two side plates; two first optical rods (222) are arranged vertically on the inner sides of the two side plates; the first lifting frame (2231) and the second lifting frame (2232) are respectively slidably arranged on the two first optical rods (222), and the first spring (224) is sleeved on the first optical rod (222); two ends of the first driving link (225) are respectively rotatably connected with the first lifting frame (2231) and the first pin (231), and two ends of the second driving link (226) are respectively rotatably connected with the second lifting frame (2232) and the third pin (241); two cams (227) are fixedly arranged on the rotating rod (221), and the two cams (227) respectively abut against the tops of the first lifting frame (2231) and the second lifting frame (2232).

3. The quick-release low-torque steering column assembly for a forklift according to claim 2, characterized in that, The locking driving member further includes a lifting plate (228) and a disc spring (229). Two lifting plates (228) are slidably arranged vertically on the tops of the first lifting frame (2231) and the second lifting frame (2232). The first optical rod (222) penetrates through the lifting plate (228) and is in sliding fit with it. The disc spring (229) is sleeved on the first optical rod (222). A limiting plate (2281) extending longitudinally is arranged at the top end of the lifting plate (228). When the end of the cam (227) abuts between the limiting plate (2281) and the lifting plate (228), the first abutting block (23) and the second abutting block (24) clamp the steering column body (1).

4. A quick-release low-torque steering column assembly for a forklift according to claim 2 or 3, characterized in that, An avoidance groove (2271) is arranged at the end of the cam (227). The cam (227) can abut against the first optical rod (222) through the avoidance groove (2271) so that the first lifting frame (2231) and the second lifting frame (2232) can rise vertically.

5. A quick-release low-torque steering column assembly for a forklift according to claim 2 or 3, characterized in that, A dial rod (2211) is arranged at one end of the rotating rod (221), and the dial rod (2211) extends in a direction perpendicular to the rotating rod (221).

6. The quick-release low-torque steering column assembly for a forklift according to claim 3, characterized in that, The rotating column assembly further includes a limiting mechanism (3) for restricting the rotation of the cam (227). The limiting mechanism (3) is arranged outside the side plate. A sliding hole is arranged on the side plate. The limiting mechanism (3) has a limiting pin (31) that can slide in the sliding hole. When the forklift starts and vibrates, the limiting pin (31) extends out of the sliding hole to abut against one side of the cam (227).

7. The quick-release low-torque steering column assembly for a forklift according to claim 6, characterized in that, The limiting mechanism (3) further includes a second mounting bracket (32), a first sliding block (331), a second sliding block (332), a ball (34), a first pushing block (351), a second pushing block (352), a first elastic member, a second elastic member (37) and a positioning pin (38). The second mounting bracket (32) is arranged on the second mounting bracket (32) outside the side plate. The second mounting bracket (32) includes two support plates perpendicular to the side plate and a second connecting plate connecting the two support plates. The first sliding block (331) and the second sliding block (332) are arranged on the inner side of the second connecting plate to slide towards or away from each other. Four-sided grooves are arranged on the opposite sides of the first sliding block (331) and the second sliding block (332). Outer inclined surfaces facing the support plates are arranged on the opposite sides of the first sliding block (331) and the second sliding block (332). The ball (34) is arranged in the four-sided groove. The first pushing block (351) and the second pushing block (352) are arranged on the inner side of the support plate to slide along the length direction of the support plate. The first pushing block (351) is in sliding fit with the outer inclined surface of the first sliding block (331). The second pushing block (352) is in sliding fit with the outer inclined surface of the second sliding block (332). The first elastic member elastically connects the side plate and the first pushing block (351). The second elastic member (37) elastically connects the side plate and the second pushing block (352). The positioning pin (38) is arranged on the first pushing block (351) and the second pushing block (352) and is connected to the limit pin (31).

8. The quick-release low-torque steering column assembly for a forklift according to claim 7, characterized in that, The limiting mechanism (3) further includes a positioning ring (39). The positioning ring (39) is coaxially screwed onto the limit pin (31). Two limiting grooves (311) extending along its axial direction are arranged on the circumferential surface of the limit pin (31). There are two positioning pins (38). The two positioning pins (38) are respectively arranged on the first pushing block (351) and the second pushing block (352). The ends of the two positioning pins (38) are slidably arranged in the limiting grooves (311) and abut against the end face of the positioning ring (39).

9. A quick-release low-torque steering column assembly for a forklift according to claim 7 or 8, characterized in that, The first elastic member and the second elastic member (37) have the same structure. The first elastic member includes a second smooth rod (361) and a second spring (362). The second smooth rod (361) is arranged on the inner side of the support plate. The second smooth rod (361) penetrates through the first pushing block (351) and is in sliding fit with it. The second spring (362) is sleeved on the second smooth rod (361). The second spring (362) is located between the side plate and the first pushing block (351).

Images