Closed type hydraulic drive snow removal truck with high and low speed switching function

Abstract

The utility model provides a closed hydraulic drive snow removal truck with high and low speed switching, which comprises a snow removal truck body and a working end device arranged on the front side of the snow removal truck body, the snow removal truck body is provided with a closed hydraulic system, an engine, a constant displacement hydraulic motor and a high and low speed change gear set, and the closed hydraulic system comprises a two-way variable pump. The two-way variable pump is connected with the engine and connected with the constant displacement hydraulic motor through two main oil pipes, the constant displacement hydraulic motor is further connected with the high-low speed change gear set, the output end of the high-low speed change gear set is connected with the front axle and the rear axle through the transmission shaft, and the working end device is connected with the engine through the clutch. According to the snow removal truck, the walking part and the working end part of the snow removal truck can be driven to work through one engine, the manufacturing cost of the snow removal truck is reduced, the functions of stepless speed change, constant-speed walking, front-back switching and brake stopping can be achieved through the design of the closed hydraulic system, and the snow removal truck can be driven to work through the high-low speed change gear set. The three modes of the snow removal truck can be switched, operation is easy, meanwhile, oil consumption is reduced, and noise is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of snow sweepers, in particular to a closed hydraulically driven snow sweeper with high and low speed switching. Background Art

[0002] There are two main types of small four-wheel snowplows on the market. One is a modified simple beach car, which requires two engines to drive the movement and the rotation of the working end respectively, for example, a manned four-wheel drive snowplow with publication number CN218405258U. The above snowplow has high fuel consumption and high noise; the other works through a complex gear box, for example, a four-wheel drive multi-purpose vehicle chassis structure with publication number CN217598352U, and the above structure requires operations such as clutching, gear shifting, forward and reverse switching, and braking.

[0003] Therefore, existing snowplows are basically cumbersome to operate, and cannot achieve infinitely variable speed when traveling, which is troublesome for sanitation workers who are generally older. In response to the above shortcomings, there are also snowplows that are driven by hydraulic systems to travel and rotate at the working end. These are generally snowplows modified from loaders, but they are expensive and expensive to sell. In addition, hydraulics are the energy source of the working end, which has a large energy loss and requires a larger engine to drive, resulting in greater fuel consumption and noise. Utility Model Content

[0004] The purpose of the utility model is to provide a closed hydraulically driven snowplow with high and low speed switching, so as to solve the problems in the prior art that the snowplow is complicated to operate, cannot achieve stepless speed change, has high cost of hydraulic control type, consumes a lot of fuel and has high noise.

[0005] In order to solve the above technical problems, the utility model is implemented through the following technical solutions:

[0006] A closed hydraulically driven snowplow with high and low speed switching, comprising a snowplow body and a working end device arranged on the front side of the snowplow body, the snowplow body is provided with a closed hydraulic system, an engine, a quantitative hydraulic motor and a high and low speed gear set, the closed hydraulic system comprises a two-way variable pump, the two-way variable pump is connected to the engine and connected to the quantitative hydraulic motor through two main oil pipes, the quantitative hydraulic motor is also connected to the high and low speed gear set, the output end of the high and low speed gear set is connected to the front and rear axles through a transmission shaft, and the working end device is connected to the engine through a clutch.

[0007] Preferably, a speed reduction mechanism is further provided between the clutch and the working end device.

[0008] Preferably, an oil suction filter is further provided between the bidirectional variable pump and the engine, and the closed hydraulic system further comprises an oil replenishment relief valve and an oil replenishment pressure diagnostic port.

[0009] Preferably, the filtration accuracy of the above-mentioned oil absorption filter is 20-30μ.

[0010] Preferably, the high and low speed gear set comprises a functional mode switching module, which controls the switching of three working modes of the snowplow: low speed working mode, neutral trailer mode and high speed transfer mode.

[0011] Preferably, the continuously variable speed range of the high-speed transfer mode is 0-12 km / h, the continuously variable speed range of the low-speed working mode is 0-6 km / h, and the torque of the tires on the snowplow body at low speed is twice that at high speed.

[0012] Preferably, the working end device is detachably connected to the snowplow body, and the working end device is a snowplow device, a snow throwing device, or a snow pushing device.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] (1) The snowplow of the utility model can control the closed hydraulic system and the clutch to work by one engine, that is, the running part and the working end part of the snowplow only need the same engine, which reduces the assembly volume of the snowplow and also reduces the manufacturing cost of the snowplow;

[0015] (2) Through the design of a closed hydraulic system, a two-way variable pump and a fixed-displacement hydraulic motor form a closed control system. By simply operating the operating lever on the snowplow body, the functions of stepless speed change, constant speed travel, front and rear switching, and brake stop can be realized. A high and low speed gear set is installed between the hydraulic power output end and the wheel to realize the switching of three modes: low-speed working mode, neutral towing mode, and high-speed transfer mode. The operation is simple and convenient for older sanitation workers to use.

[0016] (3) The working end device adopts a mechanical structure with very high energy utilization rate, that is, the clutch is connected to the engine to realize power output and cut-off. Compared with the use of hydraulic system, it greatly reduces fuel consumption, reduces operating noise, and improves the quality of the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a working principle diagram of the utility model;

[0019] Figure 3 It is the principle diagram of the closed hydraulic system in the utility model.

[0020] In the figure: 1-engine; 2-front section of closed hydraulic system; 3-main oil pipe; 4-quantitative hydraulic motor; 5-high and low speed gear set; 6-working end clutch; 7-reduction mechanism; 8-working end; 9-snowplow body; 10-two-way variable pump; 11-oil suction filter; 12-oil replenishment overflow valve; 13-oil replenishment pressure diagnostic port; 14-bypass valve. DETAILED DESCRIPTION

[0021] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] like Figure 1-3 As shown, a closed hydraulically driven snowplow with high and low speed switching includes a snowplow body 9 and a working end device 8 arranged on the front side of the snowplow body. The snowplow body 9 is provided with a closed hydraulic system 2, an engine 1, a quantitative hydraulic motor 4 and a high and low speed gear set 5. The closed hydraulic system 2 includes a two-way variable pump 10, which is connected to the engine 1 and connected to the quantitative hydraulic motor 4 through two main oil pipes 3, the two main oil pipes 3 are main oil pipe A and main oil pipe B respectively, the quantitative hydraulic motor 4 is also connected to the high and low speed gear set 5, the output end of the high and low speed gear set 5 is connected to the front and rear axles through a transmission shaft, and the working end device 8 is connected to the engine 1 through a clutch 6.

[0023] When working, start the engine 1, and the engine 1 can drive the two-way variable pump 10 to work. By controlling the two-way variable pump 10, the flow rate and flow direction of the hydraulic oil can be changed, that is, one oil pipe will squeeze the oil and the other oil pipe will absorb the oil between the main oil pipe A and the main oil pipe B, or the two oil pipes will be in a balanced flow state, so as to realize the stepless speed change and forward and reverse rotation of the quantitative hydraulic motor 4; the engine 1 can also drive the clutch 6 to work at the same time, realize power output and cut-off, and drive the working end device to work and stop.

[0024] The snowplow of the utility model can control the closed hydraulic system 2 and the clutch 3 to work through an engine 1, that is, the walking part and the working end part of the snowplow only need the same engine, which reduces the assembly volume of the snowplow and also reduces the production cost of the snowplow; through the design of the closed hydraulic system 2, the two-way variable pump 10 and the quantitative hydraulic motor 4 form a closed control system, and only the operating lever on the snowplow body 1 is operated to realize the functions of stepless speed change, constant speed travel, front and rear switching, and brake stop, and then a high and low speed gear set 5 is installed between the hydraulic power output end and the wheel to realize the switching of three modes: low-speed working mode, neutral trailer mode and high-speed transfer mode. The operation is simple and convenient for older sanitation workers to use; the working end device 8 adopts a mechanical structure with very high energy utilization rate, that is, the clutch 6 is connected to the engine 1 to realize power output and cut-off. Compared with the use of the hydraulic system, it greatly reduces fuel consumption, can also reduce the use noise, and improve the quality of the working environment.

[0025] Furthermore, a speed reduction mechanism 7 is provided between the clutch 6 and the working end device 8. With the above design, when the speed of the working end device is different from the speed of the engine 1, the speed reduction mechanism 7 can be used to adjust the speed. If the speeds of the two are exactly the same, the speed reduction mechanism does not need to work, thereby improving the effectiveness of the snowplow.

[0026] Furthermore, an oil suction filter 11 is provided between the bidirectional variable pump 10 and the engine 1, and the closed hydraulic system 2 further includes an oil replenishment relief valve 12 and an oil replenishment pressure diagnostic port 13. The filtration accuracy of the oil suction filter 11 is 20-30μ, preferably 25μ. Since the bidirectional variable pump 10 may leak oil during operation, the above design can replenish the oil in real time to ensure the stable operation of the bidirectional variable pump 10, thereby improving the working coordination between the bidirectional variable pump 10 and the quantitative hydraulic motor 4, thereby improving the working efficiency of the snowplow.

[0027] Specifically, according to the usage, in the closed hydraulic system 2, an oil replenishment overflow valve 12 is provided on the main oil pipe A and the main oil pipe B, so that oil replenishment can be performed in real time. A bypass valve 14 is also provided between the two main oil pipes 3. When a fault occurs and the engine 1 does not work, the bypass valve 14 can be manually operated to achieve operations such as manual pushing of the cart.

[0028] Furthermore, the high and low speed gear set 5 includes a functional mode switching module, which controls the switching of the three working modes of the snowplow, namely, the low-speed working mode, the neutral trailer mode and the high-speed transfer mode. The continuously variable speed range of the high-speed transfer mode is 0-12Km / h, and the continuously variable speed range of the low-speed working mode is 0-6Km / h. At low speed, the torque of the tire on the snowplow body 1 is twice that at high speed.

[0029] In the above design, the low-speed working mode is the common working mode of the snowplow. As a low-speed working machine, the speed will not be too fast when working. By reducing the speed to increase the torque, the snow-clearing operation can be stably driven; the neutral gear towing mode is to not start the engine 1, short-distance towing or manual pushing; the high-speed transfer mode is that the working end does not work, and the snowplow can quickly reach the designated location. When high-speed transfer is required, the high and low speed gear set 5 is engaged in high gear, which can achieve a continuously variable speed of 0-12Km / h. When low-speed work is required, the low speed gear is engaged to achieve a continuously variable speed of 0-6Km / h. At this time, the tire torque is twice that of the high speed gear.

[0030] Furthermore, the working end device 8 can be detachably connected to the snowplow body 1, and the working end device 8 is a snowplow device, a snow throwing device, or a snow pushing device. The above design can replace the working end device according to the use requirements to achieve functions such as snowplowing, snow throwing, and snow pushing. The mechanical structure with very high energy utilization rate is connected to the engine 1. The power is controlled by the opening and closing of the clutch 6 to realize the operation and stop of the working end. Mechanical clutch or electromagnetic clutch can be used. In this case, electromagnetic clutch is used.

[0031] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed hydraulically driven snowplow with high and low speed switching, comprising a snowplow body and a working end device arranged at the front side of the snowplow body, characterized in that: The snowplow body is provided with a closed hydraulic system, an engine, a fixed-displacement hydraulic motor and a high-low speed gear set. The closed hydraulic system includes a two-way variable pump, which is connected to the engine and to the fixed-displacement hydraulic motor through two main oil pipes. The fixed-displacement hydraulic motor is also connected to the high-low speed gear set. The output end of the high-low speed gear set is connected to the front and rear axles through a transmission shaft, and the working end device is connected to the engine through a clutch.

2. A closed hydraulically driven snowplow with high and low speed switching according to claim 1, characterized in that: A speed reduction mechanism is also provided between the clutch and the working end device.

3. A closed hydraulically driven snowplow with high and low speed switching according to claim 1, characterized in that: An oil suction filter is also arranged between the bidirectional variable pump and the engine, and the closed hydraulic system also includes an oil replenishment overflow valve and an oil replenishment pressure diagnosis port.

4. A closed hydraulically driven snowplow with high and low speed switching according to claim 3, characterized in that: The filtering accuracy of the oil suction filter is 20-30μ.

5. A closed hydraulically driven snowplow with high and low speed switching according to claim 1, characterized in that: The high and low speed gear set includes a functional mode switching module, which controls the switching of three working modes of the snowplow: a low speed working mode, a neutral trailer mode and a high speed transfer mode.

6. A closed hydraulically driven snowplow with high and low speed switching according to claim 5, characterized in that: The continuously variable speed range of the high-speed transfer mode is 0-12 km / h, and the continuously variable speed range of the low-speed working mode is 0-6 km / h. The torque of the tires on the snowplow body at low speed is twice that at high speed.

7. A closed hydraulically driven snowplow with high and low speed switching according to claim 1, characterized in that: The working end device is detachably connected to the snowplow body, and the working end device is a snowplow device, a snow throwing device, or a snow pushing device.

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