Standing driving type forward moving forklift drive axle system

Abstract

The utility model discloses a stand driving type forward moving forklift drive axle system, and particularly relates to the technical field of forklifts, which comprises a drive axle body, an auxiliary wheel part, a drive wheel part and a hydraulic oil supply part, the auxiliary wheel part comprises an auxiliary wheel, an auxiliary wheel oil cylinder, an auxiliary wheel spring, an auxiliary wheel spring upper seat and an auxiliary wheel spring lower seat; the auxiliary wheel oil cylinder is installed on the drive axle body, the auxiliary wheel oil cylinder is connected with the auxiliary wheel spring upper seat through the piston rod, the auxiliary wheel spring upper seat and the auxiliary wheel spring lower seat are installed at the two ends of the auxiliary wheel spring, and the auxiliary wheel spring lower seat is connected with the auxiliary wheel. And the auxiliary wheel oil cylinder is hydraulically connected with the hydraulic oil supply part through a pipeline. The auxiliary wheels, the auxiliary wheel oil cylinders and the auxiliary wheel springs are connected with the drive axle body, rigid connection between the auxiliary wheels and the drive axle body can be achieved by controlling the positions of the piston rods of the auxiliary wheel oil cylinders, and the transverse stability of a whole vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, and more specifically to a driving axle system of a stand-up forward-moving forklift. Background Art

[0002] The known existing stand-on forward-reaching forklift drive axle includes a driving wheel mechanism, an auxiliary wheel mechanism, an upper connecting rod and a lower connecting rod. The driving wheel mechanism is connected to the frame through the upper connecting rod, the upper connecting rod pin and the lower connecting rod pin; the auxiliary wheel mechanism is connected to the lower connecting rod through the auxiliary wheel spring and the lower connecting rod pin; the lower connecting rod is connected to the frame through the lower connecting rod spring and the lower connecting rod pin; the lower connecting rod is connected to the driving wheel mechanism through the lower connecting rod pin.

[0003] However, in actual use, the existing stand-on type reach forklift drive axle system has the following problems: 1. The auxiliary wheel is elastically connected to the frame through a connecting rod mechanism and a spring, and the lateral stability of the whole vehicle is poor; 2. The driving wheel and the auxiliary wheel are connected to the frame through a connecting rod mechanism, and there is shaking when the vehicle is operating at a high position; therefore, in view of the above problems, a stand-on type reach forklift drive axle system is proposed as a further improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a stand-on reach forklift drive axle system to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a driving axle system of a stand-up forward reach forklift, the system comprising: a driving axle body, an auxiliary wheel part, a driving wheel part and a hydraulic oil supply part;

[0006] The drive axle body is fixedly connected to the frame of the stand-on reach forklift;

[0007] The auxiliary wheel part comprises: an auxiliary wheel, an auxiliary wheel oil cylinder, an auxiliary wheel spring, an auxiliary wheel spring upper seat and an auxiliary wheel spring lower seat;

[0008] The bottom of the auxiliary wheel oil cylinder is fixedly mounted on the driving axle body, the auxiliary wheel oil cylinder is fixedly connected to the auxiliary wheel spring upper seat through a piston rod, the two ends of the auxiliary wheel spring are respectively mounted on the auxiliary wheel spring upper seat and the auxiliary wheel spring lower seat, and the end of the auxiliary wheel spring lower seat away from the auxiliary wheel spring is connected to the auxiliary wheel;

[0009] The driving wheel unit comprises: a gear box and a driving wheel;

[0010] The gear box is fixedly connected to the drive axle body, and the drive wheel is fixedly connected to the gear box;

[0011] The auxiliary wheel cylinder is hydraulically connected to a hydraulic oil supply unit through a pipeline.

[0012] Further, the hydraulic oil supply unit includes: an oil pump motor, a hydraulic oil pump, a hydraulic oil tank, a one-way valve, a two-position four-way solenoid valve and a two-position two-way solenoid valve;

[0013] The oil pump motor is connected to the hydraulic oil pump, the oil inlet end of the hydraulic oil pump is connected to the oil outlet end of the hydraulic oil tank through a pipeline, the oil outlet end of the hydraulic oil pump is connected to one end of a one-way valve through a pipeline, the other end of the one-way valve is connected to one end of a two-position four-way solenoid valve through a pipeline, the other end of the two-position four-way solenoid valve is connected to one end of a two-position two-way solenoid valve through a pipeline, and the other end of the two-position two-way solenoid valve is connected to the auxiliary wheel cylinder through a pipeline.

[0014] Furthermore, the hydraulic oil supply unit further includes: an oil return filter;

[0015] The oil inlet end of the hydraulic oil tank is connected to the return oil filter through a pipeline, and the other end of the return oil filter is connected to one end of a two-position four-way solenoid valve through a pipeline.

[0016] Furthermore, the hydraulic oil supply unit further includes: a relief valve;

[0017] One end of the overflow valve is connected to the pipeline between the hydraulic oil pump and the one-way valve, and the other end of the overflow valve is connected to the pipeline between the return oil filter and the two-position four-way solenoid valve.

[0018] Further, the two-position four-way solenoid valve comprises: an electromagnet m1 and corresponding four-way interfaces: port P1, port B1, port A and port T;

[0019] The one-way valve is connected to the P1 port through a pipeline, the B1 port is connected to a two-position two-way solenoid valve through a pipeline, and the T port is connected to an oil return filter through a pipeline.

[0020] Further, the two-position two-way solenoid valve comprises: an electromagnet m2 and corresponding two-way interfaces: a P2 port and a B2 port;

[0021] The P2 port is connected to the B1 port through a pipeline, and the B2 port is connected to the auxiliary wheel cylinder through a pipeline.

[0022] Technical effects and advantages of the utility model:

[0023] 1. Compared with the prior art, the auxiliary wheel, the auxiliary wheel cylinder and the auxiliary wheel spring are connected to the drive axle body, and the position of the auxiliary wheel cylinder piston rod can be controlled to achieve a rigid connection between the auxiliary wheel and the drive axle body, thereby improving the lateral stability of the whole vehicle.

[0024] 2. Compared with the prior art, the driving wheel is rigidly connected to the driving axle body. When the vehicle is working at a high position, the auxiliary wheel can be rigidly connected to the driving axle body by controlling the position of the auxiliary wheel cylinder piston rod, thereby solving the problem of shaking during high-position operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the system structure of the utility model.

[0026] The accompanying drawings are marked as follows:

[0027] 1. Drive axle body;

[0028] 2. Auxiliary wheel unit;

[0029] 21. Auxiliary wheel; 22. Auxiliary wheel oil cylinder; 23. Auxiliary wheel spring; 24. Auxiliary wheel spring upper seat; 25. Auxiliary wheel spring lower seat; 26. Piston rod;

[0030] 3. driving wheel; 31. gear box; 32. driving wheel;

[0031] 4. Hydraulic oil supply department;

[0032] 41. Oil pump motor; 42. Hydraulic oil pump; 43. Hydraulic oil tank; 44. One-way valve; 45. Two-position four-way solenoid valve; 46. Two-position two-way solenoid valve; 47. Return oil filter; 48. Overflow valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] As attached Figure 1 A driving axle system of a stand-up reach forklift shown in the figure is characterized in that the system comprises: a driving axle body 1, an auxiliary wheel part 2, a driving wheel part 3 and a hydraulic oil supply part 4;

[0035] The driving axle body 1 is fixedly connected to the frame of the stand-on reach forklift;

[0036] The auxiliary wheel unit 2 includes: an auxiliary wheel 21, an auxiliary wheel oil cylinder 22, an auxiliary wheel spring 23, an auxiliary wheel spring upper seat 24 and an auxiliary wheel spring lower seat 25;

[0037] The bottom of the auxiliary wheel oil cylinder 22 is fixedly mounted on the driving axle body 1, and the auxiliary wheel oil cylinder 22 is fixedly connected to the auxiliary wheel spring upper seat 24 through a piston rod 26. The two ends of the auxiliary wheel spring 23 are respectively mounted on the auxiliary wheel spring upper seat 24 and the auxiliary wheel spring lower seat 25, and the end of the auxiliary wheel spring lower seat 25 away from the auxiliary wheel spring 23 is connected to the auxiliary wheel 21.

[0038] In the above connection, the auxiliary wheel 21 is connected to the drive axle body 1 through the auxiliary wheel cylinder 22 and the auxiliary wheel spring 23. If this can be achieved by controlling the position of the piston rod 26 of the auxiliary wheel cylinder 22, the auxiliary wheel 21 can be rigidly connected to the drive axle body 1 to improve the lateral stability of the whole vehicle.

[0039] The driving wheel part 3 includes: a gear box 31 and a driving wheel 32;

[0040] The gear box 31 is fixedly connected to the drive axle body 1 , and the drive wheel 32 is fixedly connected to the gear box 31 ;

[0041] Among them, the above connection, the driving wheel 32 is rigidly connected to the driving axle body 1. When the vehicle is working at a high position, the auxiliary wheel 21 can be rigidly connected to the driving axle body 1 by controlling the position of the piston rod 26 of the auxiliary wheel cylinder 22, thereby solving the shaking problem of high-position operation;

[0042] The auxiliary wheel cylinder 22 is hydraulically connected to the hydraulic oil supply unit 4 through a pipeline.

[0043] In a preferred embodiment, as shown in the attached Figure 1 As shown, the hydraulic oil supply unit 4 includes: an oil pump motor 41, a hydraulic oil pump 42, a hydraulic oil tank 43, a one-way valve 44, a two-position four-way solenoid valve 45 and a two-position two-way solenoid valve 46;

[0044] The oil pump motor 41 is connected to the hydraulic oil pump 42, the oil inlet end of the hydraulic oil pump 42 is connected to the oil outlet end of the hydraulic oil tank 43 through a pipeline, the oil outlet end of the hydraulic oil pump 42 is connected to one end of a one-way valve 44 through a pipeline, the other end of the one-way valve 44 is connected to one end of a two-position four-way solenoid valve 45 through a pipeline, the other end of the two-position four-way solenoid valve 45 is connected to one end of a two-position two-way solenoid valve 46 through a pipeline, and the other end of the two-position two-way solenoid valve 46 is connected to the auxiliary wheel cylinder 22 through a pipeline;

[0045] The two-position four-way solenoid valve 45 includes: an electromagnet m1 and corresponding four-way interfaces: port P1, port B1, port A and port T; the one-way valve 44 is connected to port P1 through a pipeline, port B1 is connected to the two-position two-way solenoid valve 46 through a pipeline, and port T is connected to the return oil filter 47 through a pipeline; the two-position two-way solenoid valve 46 includes: an electromagnet m2 and corresponding two-way interfaces: port P2 and port B2; port P2 is connected to port B1 through a pipeline, and port B2 is connected to the auxiliary wheel cylinder 22 through a pipeline;

[0046] Among them, the left working position of the two-position two-way solenoid valve 46 includes a one-way valve, so that the one-way valve maintains the pressure of the hydraulic system;

[0047] Through the above arrangement, the hydraulic oil extracted from the hydraulic oil tank 43 by the hydraulic oil pump 42 flows to the P1 port of the two-position four-way solenoid valve 45 through the one-way valve 44, from the P1 port of the two-position four-way solenoid valve 45 to the B1 port, from the B1 port to the P2 port of the two-position two-way solenoid valve 46, from the P2 port of the two-position two-way solenoid valve 46 to the B2 port, and from the B2 port to the rodless chamber of the auxiliary wheel cylinder 22;

[0048] The hydraulic oil supply unit 4 further includes: an oil return filter 47;

[0049] The oil inlet end of the hydraulic oil tank 43 is connected to the return oil filter 47 through a pipeline, and the other end of the return oil filter 47 is connected to one end of the two-position four-way solenoid valve 45 through a pipeline, so that the hydraulic oil in the auxiliary wheel cylinder 22 passes through the B2 port to the P2 port of the two-position two-way solenoid valve 46, from the P2 port of the two-position two-way solenoid valve 46 to the B1 port of the two-position four-way solenoid valve 45, and from the B1 port to the T port of the two-position four-way solenoid valve 45, and returns to the hydraulic oil tank 43 through the return oil filter 47.

[0050] In a preferred embodiment, as shown in the attached Figure 1 As shown, the hydraulic oil supply unit 4 further includes: a relief valve 48;

[0051] One end of the relief valve 48 is connected to the pipeline between the hydraulic oil pump 42 and the one-way valve 44 , and the other end of the relief valve 48 is connected to the pipeline between the return oil filter 47 and the two-position four-way solenoid valve 45 .

[0052] Working principle of the utility model: when in use, when the controller senses that the vehicle has turned or has hydraulic action, the oil pump motor 41 is controlled to work, the electromagnet m1 of the two-position four-way solenoid valve 45 is energized, and the hydraulic oil pump 42 draws the hydraulic oil from the hydraulic oil tank 43 through the one-way valve 44 to the P1 port of the two-position four-way solenoid valve 45, from the P1 port of the two-position four-way solenoid valve 45 to the B1 port, from the B1 port to the P2 port of the two-position two-way solenoid valve 46, from the P2 port of the two-position two-way solenoid valve 46 to the B2 port, from the B2 port to the rodless chamber of the auxiliary wheel cylinder 22, pushing the piston rod 26 of the auxiliary wheel cylinder 22 to The auxiliary wheel 21 is rigidly connected to the driving axle body 1 through the auxiliary wheel spring upper seat 24, the auxiliary wheel spring lower seat 25 and the auxiliary wheel oil cylinder 22, thereby improving the lateral stability of the vehicle during steering and sideways movement of the fork, and solving the problem of shaking during high-position operation.

[0053] When the controller senses that the vehicle has no steering and hydraulic action, the electromagnet m2 of the two-position two-way solenoid valve 46 is energized. Under the spring force of the auxiliary wheel spring 23, the hydraulic oil in the auxiliary wheel cylinder 22 passes through the B2 port of the two-position two-way solenoid valve 46 to the P2 port, from the P2 port of the two-position two-way solenoid valve 46 to the B1 port of the two-position four-way solenoid valve 45, from the B1 port of the two-position four-way solenoid valve 45 to the T port, and returns to the hydraulic oil tank 43 through the return oil filter 47, thereby unloading the auxiliary wheel cylinder 22 and restoring the elastic connection between the auxiliary wheel 21 and the drive axle 32, ensuring that the four tires of the vehicle: two load-bearing wheels, one driving wheel, and one auxiliary wheel can touch the ground at the same time.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drive axle system for a stand-up reach forklift, characterized in that: The system comprises: a drive axle body (1), an auxiliary wheel portion (2), a drive wheel portion (3) and a hydraulic oil supply portion (4); The drive axle body (1) is fixedly connected to a frame of a stand-on reach forklift; The auxiliary wheel part (2) comprises: an auxiliary wheel (21), an auxiliary wheel oil cylinder (22), an auxiliary wheel spring (23), an auxiliary wheel spring upper seat (24) and an auxiliary wheel spring lower seat (25); The bottom of the auxiliary wheel oil cylinder (22) is fixedly mounted on the driving axle body (1); the auxiliary wheel oil cylinder (22) is fixedly connected to the auxiliary wheel spring upper seat (24) via a piston rod (26); the two ends of the auxiliary wheel spring (23) are respectively mounted on the auxiliary wheel spring upper seat (24) and the auxiliary wheel spring lower seat (25); and the end of the auxiliary wheel spring lower seat (25) away from the auxiliary wheel spring (23) is connected to the auxiliary wheel (21); The driving wheel portion (3) comprises: a gear box (31) and a driving wheel (32); The gear box (31) is fixedly connected to the drive axle body (1), and the drive wheel (32) is fixedly connected to the gear box (31); The auxiliary wheel oil cylinder (22) is hydraulically connected to the hydraulic oil supply part (4) via a pipeline.

2. The drive axle system of a stand-on reach forklift according to claim 1, characterized in that: The hydraulic oil supply unit (4) comprises: an oil pump motor (41), a hydraulic oil pump (42), a hydraulic oil tank (43), a one-way valve (44), a two-position four-way solenoid valve (45) and a two-position two-way solenoid valve (46); The oil pump motor (41) is connected to the hydraulic oil pump (42); the oil inlet end of the hydraulic oil pump (42) is connected to the oil outlet end of the hydraulic oil tank (43) via a pipeline; the oil outlet end of the hydraulic oil pump (42) is connected to one end of a one-way valve (44) via a pipeline; the other end of the one-way valve (44) is connected to one end of a two-position four-way solenoid valve (45) via a pipeline; the other end of the two-position four-way solenoid valve (45) is connected to one end of a two-position two-way solenoid valve (46) via a pipeline; the other end of the two-position two-way solenoid valve (46) is connected to the auxiliary wheel cylinder (22) via a pipeline.

3. The drive axle system of a stand-on reach forklift according to claim 2, characterized in that: The hydraulic oil supply unit (4) further comprises: an oil return filter (47); The oil inlet end of the hydraulic oil tank (43) is connected to an oil return filter (47) via a pipeline, and the other end of the oil return filter (47) is connected to one end of a two-position four-way solenoid valve (45) via a pipeline.

4. The drive axle system of a stand-on reach forklift according to claim 3, characterized in that: The hydraulic oil supply unit (4) further includes: a relief valve (48); One end of the overflow valve (48) is connected to the pipeline between the hydraulic oil pump (42) and the one-way valve (44), and the other end of the overflow valve (48) is connected to the pipeline between the return oil filter (47) and the two-position four-way solenoid valve (45).

5. The drive axle system of a stand-on reach forklift according to claim 3, characterized in that: The two-position four-way solenoid valve (45) comprises: an electromagnet m1 and corresponding four-way interfaces: port P1, port B1, port A and port T; The one-way valve (44) is connected to the P1 port via a pipeline, the B1 port is connected to a two-position two-way solenoid valve (46) via a pipeline, and the T port is connected to an oil return filter (47) via a pipeline.

6. The drive axle system of a stand-on reach forklift according to claim 5, characterized in that: The two-position two-way solenoid valve (46) comprises: an electromagnet m2 and corresponding two-way interfaces: a P2 port and a B2 port; The P2 port is connected to the B1 port via a pipeline, and the B2 port is connected to the auxiliary wheel oil cylinder (22) via a pipeline.

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