Brake device and tractor

Abstract

The utility model provides a brake device and a tractor. Comprising an oil can, a first brake oil way and a second brake oil way. The first brake oil way and the second brake oil way are the same in structure. The first brake oil way comprises a first brake pump, a first brake oil cylinder and a second brake oil cylinder, the first brake pump and the first brake pedal keep synchronous movement, and an oil supply port of the first brake pump is communicated with the oil can; the first brake oil cylinder is connected with the first brake pump through a pipeline and acts on a brake device on the left side or the right side of the tractor. The first stop valve is arranged on a connecting pipeline between the first brake pump and the first brake oil cylinder and cuts off an oil return channel of the first brake oil cylinder. According to the utility model, the first stop valve is additionally arranged in the hydraulic braking oil way for service braking to control the on-off of the first braking oil way and prevent the backflow of hydraulic oil in the first braking oil cylinder, so that the parking braking effect is achieved, the cost is reduced, the reliability is improved, and the subsequent maintenance is convenient.

Description

Technical Field

[0001] The utility model relates to the field of agricultural machinery, in particular to a braking device and a tractor. Background Art

[0002] As the horsepower of tractors increases, the weight of the whole machine also increases. Continuing to use mechanical brakes will cause the problem of heavy pedals. Hydraulic brakes can effectively solve this problem, but at the same time, the parking brake also needs to be adjusted accordingly. The parking brake of mainstream tractors uses an independent mechanical handbrake. This design requires a separate brake mechanism to be designed in the gearbox. Not only is the cost high, but once a problem occurs later, the gearbox needs to be opened for maintenance, which brings huge economic losses to users.

[0003] Therefore, it is necessary to provide a brake device and a tractor to overcome the above-mentioned defectives. Utility Model Content

[0004] The utility model aims to provide a braking device and a tractor.

[0005] According to one aspect of the utility model, a braking device is provided, comprising: an oil pot, a first brake oil circuit and a second brake oil circuit; the first brake oil circuit and the second brake oil circuit have the same structure, the first brake oil circuit is controlled by a first brake pedal, and the second brake oil circuit is controlled by a second brake pedal; the first brake oil circuit comprises: a first brake pump, the first brake pump keeps synchronous movement with the first brake pedal, and its oil supply port is connected to the oil pot; a first brake cylinder, the first brake cylinder is connected to the first brake pump through a pipeline, and acts on the braking device on the left or right side of the tractor; a first stop valve is arranged on the connecting pipeline between the first brake pump and the first brake cylinder, and cuts off the return oil channel of the first brake cylinder.

[0006] Preferably, the first brake oil circuit also includes: a first control valve, the oil supply port of the first control valve is connected to the oil pot, and the working oil port is connected to the oil supply port of the first brake pump; and the operating rod of the first control valve keeps synchronous movement with the first brake pedal.

[0007] Preferably, the first control valve is a reversing valve; when the first brake pedal is in a non-braking state, the first control valve is in a normal position, and the oil inlet and the working oil port of the first control valve are in a conducting state; when the first brake pedal is in a braking state, the first control valve switches to the working position, and the oil inlet and the working oil port of the first control valve are in a cut-off state.

[0008] Preferably, the first brake oil circuit also includes: a third control valve, the oil supply port of the third control valve is connected to the pipeline from the first brake pump to the first stop valve, the working oil port of the third control valve is connected to the second brake oil circuit; and the operating rod of the third control valve maintains synchronous movement with the first brake pedal.

[0009] Preferably, the third control valve is a reversing valve; when the first brake pedal is in a non-braking state, the third control valve is in a normal position, and the oil inlet and the working oil port of the third control valve are in a cut-off state; when the first brake pedal is in a braking state, the third control valve switches to the working position, and the oil inlet and the working oil port of the third control valve are in a conducting state.

[0010] Preferably, the second brake oil circuit includes a fourth control valve, the fourth control valve has the same structure as the third control valve, and the working oil port of the third control valve is connected to the working oil of the fourth control valve;

[0011] When the first brake pedal and the second brake pedal are in the braking state at the same time, the first brake oil circuit and the second brake oil circuit are connected through the third control valve and the fourth control valve;

[0012] When at least one of the first brake pedal and the second brake pedal is in a non-braking state, the first brake oil circuit and the second brake oil circuit are disconnected through the third control valve and the fourth control valve.

[0013] Preferably, the first brake oil circuit further includes: a first throttle valve, and the first throttle valve is arranged on a connecting pipeline between the first brake pump and the first brake oil cylinder.

[0014] Preferably, the first stop valve is transmission-connected to the parking switch.

[0015] Preferably, the first brake pump comprises: a cylinder body and a piston rod, the cylinder body is divided into a hydraulic zone and a pressure-free zone by the piston rod, the hydraulic zone is respectively connected to the oil pot and the first brake cylinder or the second brake cylinder, and the piston rod is connected to the first brake pedal or the second brake pedal through a transmission mechanism; the hydraulic zone and / or the pressure-free zone are provided with elastic parts to keep the hydraulic zone in an expansion state or expansion trend.

[0016] According to another aspect of the utility model, a tractor is provided, comprising the above-mentioned braking device.

[0017] Compared with the prior art, the braking device provided by the utility model has the following beneficial effects:

[0018] The utility model achieves the effect of parking brake by adding a first stop valve in the hydraulic brake oil circuit of the service brake to control the on-off of the first brake oil circuit, thereby preventing the hydraulic oil in the first brake cylinder from flowing back, thereby reducing the cost and improving the reliability, and facilitating subsequent maintenance and care. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 It is a schematic diagram of the mechanical structure of the braking device in the utility model.

[0021] Figure 2 This is a schematic diagram of the hydraulic structure of the brake device in the utility model.

[0022] Figure 3 It is a schematic diagram of the structure of the first brake pump and the second brake pump in the utility model.

[0023] Explanation of the accompanying drawings: 1. Oil pot; 2a. First brake pedal; 2b. Second brake pedal; 3a. First brake pump; 3b. Second brake pump; 31. Cylinder body; 32. Piston rod; 33. Hydraulic area; 34. No-pressure area; 35. Elastic member; 4a. First brake cylinder; 4b. Second brake cylinder; 5a. First stop valve; 5b. Second stop valve; 6a. First control valve; 6b. Second control valve; 7a. Third control valve; 7b. Fourth control valve; 8a. First throttle valve; 8b. Second throttle valve; 9. Parking switch. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0026] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0030] See attached Figures 1 to 2 This embodiment provides a braking device, which is mainly used in tractors and can realize both driving braking and parking braking of tractors. The braking device includes: an oil pot 1, a first brake oil circuit and a second brake oil circuit; the oil pot 1 is used to store brake hydraulic oil, the first brake oil circuit and the second brake oil circuit have the same structure, and the first brake oil circuit is controlled by the first brake pedal 2a, and the second brake oil circuit is controlled by the second brake pedal 2b.

[0031] The first brake oil circuit includes: a first brake pump 3a, a first brake cylinder 4a and a first stop valve 5a; the first brake pump 3a is transmission-connected to the first brake pedal 2a, keeps synchronous movement with the first brake pedal 2a, and its oil supply port is connected to the oil pot 1; the first brake cylinder 4a is connected to the first brake pump 3a through a pipeline, and acts on the brake device on the left side of the tractor; the first stop valve 5a is arranged on the connecting pipeline between the first brake pump 3a and the first brake cylinder 4a, cutting off the return oil channel of the first brake cylinder 4a.

[0032] Similarly, the second brake oil circuit includes: a second brake pump 3b, a second brake cylinder 4b and a second stop valve 5b; the second brake pump 3b is transmission-connected to the second brake pedal 2b, and keeps synchronous movement with the second brake pedal 2b, and its oil supply port is connected to the oil pot 1; the second brake cylinder 4b is connected to the second brake pump 3b through a pipeline, and acts on the braking device on the right side of the tractor; the second stop valve 5b is arranged on the connecting pipeline between the second brake pump 3b and the second brake cylinder 4b, cutting off the return oil channel of the second brake cylinder 4b.

[0033] During the service braking process, the first brake pump 3a and the second brake pump 3b squeeze the hydraulic oil to drive the first brake cylinder 4a and the second brake cylinder 4b to act, respectively acting on the left and right brake devices of the tractor to achieve the braking of the tractor. In addition, the first stop valve 5a and the second stop valve 5b are transmission-connected with the parking switch 9. During the parking braking process, the parking switch 9 is used to switch the first stop valve 5a and the second stop valve 5b, cut off the return oil circuit of the first brake oil pump and the second oil pump, and realize the pressure maintenance of the first brake oil cylinder 4a and the second brake oil cylinder 4b, so as to achieve the parking braking of the tractor.

[0034] The first brake oil circuit also includes: a first control valve 6a, the oil supply port of the first control valve 6a is connected to the oil pot 1, and its working oil port is connected to the oil supply port of the first brake pump 3a; and the operating rod of the first control valve 6a maintains synchronous movement with the first brake pedal 2a.

[0035] The first control valve 6a and the second control valve 6b are two-position two-way reversing valves; when the first brake pedal 2a and / or the second brake pedal 2b are in the non-braking state, the first control valve 6a and / or the second control valve 6b are in the normal position, and the oil inlet and the working oil port of the first control valve 6a and / or the second control valve 6b are in the conducting state; when the first brake pedal 2a and / or the second control valve 6b are in the braking state, the first control valve 6a and / or the second control valve 6b are switched to the working position, and the oil inlet and the working oil port of the first control valve 6a and / or the second control valve 6b are in the cut-off state.

[0036] When the user steps on the first brake pedal 2a and / or the second brake pedal 2b, the first control valve 6a and / or the second control valve 6b switches from the normal position to the working position to prevent the brake hydraulic oil from flowing back into the oil tank 1 during braking, affecting the braking effect of the first brake cylinder 4a and the second brake cylinder 4b.

[0037] The first brake oil circuit also includes: a third control valve 7a, the oil supply port of the third control valve 7a is connected to the pipeline from the first brake pump 3a to the first stop valve 5a, the working oil port of the third control valve 7a is connected to the second brake oil circuit; and the operating rod of the third control valve 7a maintains synchronous movement with the first brake pedal 2a.

[0038] The second brake oil circuit also includes: a fourth control valve 7b, the oil supply port of the fourth control valve 7b is connected to the pipeline from the second brake pump 3b to the second stop valve 5b, the working oil port of the fourth control valve 7b is connected to the working oil of the fourth control valve 7b; and the operating rod of the third control valve 7a maintains synchronous movement with the first brake pedal 2a.

[0039] The third control valve 7a and the fourth control valve 7b are both two-position two-way reversing valves; when the first brake pedal 2a and / or the second brake valve are in a non-braking state, the third control valve 7a and / or the fourth control valve 7b are in a normal position, and the oil inlet and the working oil port of the third control valve 7a and / or the fourth control valve 7b are in a cut-off state; when the first brake pedal 2a and / or the second brake pedal 2b are in a braking state, the third control valve 7a and / or the fourth control valve 7b are switched to the working position, and the oil inlet and the working oil port of the third control valve 7a and / or the fourth control valve 7b are in a conducting state.

[0040] In general, the first brake pedal 2a and the second brake pedal 2b of the tractor are in a locked state, and the first brake pedal 2a and the second brake pedal 2b keep moving synchronously. When the user steps on the first brake pedal 2a and the second brake pedal 2b at the same time, the first brake pedal 2a and the second brake pedal 2b are in a braking state at the same time, and the first brake oil circuit and the second brake oil circuit are connected through the third control valve 7a and the fourth control valve 7b.

[0041] When the tractor needs unilateral braking during special operations, the first brake pedal 2a and the second brake pedal 2b can move independently of each other without affecting each other. When the user steps on the first brake pedal 2a or the second brake pedal 2b alone, the first brake oil circuit and the second brake oil circuit are disconnected through the third control valve 7a and the fourth control valve 7b, and the hydraulic oil in the first brake cylinder 4a and the second brake cylinder 4b are independent of each other, thereby achieving unilateral braking of the tractor.

[0042] The first brake oil circuit also includes: a first throttle valve 8a, which is arranged on the connecting pipeline between the first brake pump 3a and the first brake oil cylinder 4a. The second brake oil circuit also includes: a second throttle valve 8b, which is arranged on the connecting pipeline between the second brake pump 3b and the second brake oil cylinder 4b. The first throttle valve 8a and the second throttle valve 8b can both adjust the pressure in their respective oil circuits to ensure the stability and reliability of braking.

[0043] See attached Figure 3 The first brake pump 3a and the second brake pump 3b are both hydraulic pumps; the hydraulic pump includes: a cylinder body 31 and a piston rod 32, the cylinder body 31 is divided into a hydraulic area 33 and a pressure-free area 34 by the piston rod 32, the hydraulic area 33 is respectively connected to the oil pot 1 and the first brake oil cylinder 4a or the second brake oil cylinder 4b, and the piston rod 32 is connected to the first brake pedal 2a or the second brake pedal 2b through a transmission mechanism. Among them, the hydraulic area 33 and / or the pressure-free area 34 are provided with an elastic member 35 to keep the hydraulic area 33 in an expansion state or expansion trend, and the oil pot 1 is arranged above the first brake pump 3a and the second brake pump 3b. Under the action of the elastic member 35, the brake hydraulic oil will fill the hydraulic area 33 of the hydraulic pump, and the user steps on the first brake pedal 2a and / or the second brake pedal 2b to drive the hydraulic oil to move to the first brake oil cylinder 4a and / or the second brake oil cylinder 4b, so as to realize the conduction of the brake hydraulic oil.

[0044] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A braking device, characterized in that: include: An oil pot, a first brake oil circuit and a second brake oil circuit; the first brake oil circuit and the second brake oil circuit have the same structure, the first brake oil circuit is controlled by a first brake pedal, and the second brake oil circuit is controlled by a second brake pedal; The first brake oil circuit comprises: a first brake pump, the first brake pump keeps synchronous movement with the first brake pedal, and its oil supply port is connected with the oil pot; a first brake oil cylinder, which is connected to the first brake pump through a pipeline and acts on a brake device on the left side or the right side of the tractor; A first stop valve is provided on a connecting pipeline between the first brake pump and the first brake cylinder to cut off an oil return passage of the first brake cylinder.

2. The braking device according to claim 1, characterized in that The first brake oil circuit also includes: The first control valve, the oil supply port of the first control valve is connected to the oil pot, and the working oil port is connected to the oil supply port of the first brake pump; and the operating rod of the first control valve keeps synchronous movement with the first brake pedal.

3. The braking device according to claim 2, characterized in that: The first control valve is a reversing valve; When the first brake pedal is in a non-braking state, the first control valve is in a normal position, and the oil inlet and the working oil port of the first control valve are in a conducting state; When the first brake pedal is in a braking state, the first control valve is switched to a working position, and the oil inlet and the working oil port of the first control valve are in a cut-off state.

4. The braking device according to claim 1, characterized in that: The first brake oil circuit also includes: A third control valve, wherein the oil supply port of the third control valve is connected to the pipeline from the first brake pump to the first stop valve, and the working oil port of the third control valve is connected to the second brake oil circuit; and the operating rod of the third control valve maintains synchronous movement with the first brake pedal.

5. The braking device according to claim 4, characterized in that: The third control valve is a reversing valve; When the first brake pedal is in a non-braking state, the third control valve is in a normal position, and the oil inlet and the working oil port of the third control valve are in a cut-off state; When the first brake pedal is in a braking state, the third control valve is switched to a working position, and the oil inlet and the working oil port of the third control valve are in a conducting state.

6. The braking device according to claim 5, characterized in that: The second brake oil circuit includes a fourth control valve, the fourth control valve has the same structure as the third control valve, and the working oil port of the third control valve is connected to the working oil of the fourth control valve; When the first brake pedal and the second brake pedal are in the braking state at the same time, the first brake oil circuit and the second brake oil circuit are connected through the third control valve and the fourth control valve; When at least one of the first brake pedal and the second brake pedal is in a non-braking state, the first brake oil circuit and the second brake oil circuit are disconnected through the third control valve and the fourth control valve.

7. The braking device according to claim 1, characterized in that: The first brake oil circuit also includes: A first throttle valve is provided on a connecting pipeline between the first brake pump and the first brake cylinder.

8. The braking device according to claim 1, characterized in that: The first stop valve is transmission-connected to the parking switch.

9. The braking device according to claim 1, characterized in that: The first brake pump comprises: a cylinder body and a piston rod, the cylinder body is divided into a hydraulic area and a pressure-free area by the piston rod, the hydraulic area is respectively connected to the oil pot and the first brake cylinder or the second brake cylinder, and the piston rod is connected to the first brake pedal or the second brake pedal through a transmission mechanism; The hydraulic zone and / or the pressure-free zone are provided with elastic members to keep the hydraulic zone in an expansion state or expansion trend.

10. A tractor, characterized in that: A braking device comprising the braking device according to any one of claims 1 to 9.

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