Brake device for tractor

Abstract

The utility model provides a brake device for a tractor. Comprising a first brake pedal, a mounting side plate, a fixing sleeve and a first sensor. The first brake pedal comprises a first rotating shaft, a first sleeve part integrally rotating with the first rotating shaft, a first connecting part fixedly mounted on the first sleeve part, a first treading part arranged at the other end of the first connecting part, and a first limiting part arranged at one end of the first rotating shaft; the two ends of the first rotating shaft are inserted into the two fixing sleeves correspondingly, and the first limiting part penetrates through one fixing sleeve. The first sensor is installed on the installation side plate and connected with the first limiting part. According to the utility model, the first sensor is coaxially arranged on the first brake pedal, so that the treading stroke information, namely the brake stroke information, of the first brake pedal can be accurately measured, and the first sensor is positioned on the mounting side plate, so that the mounting space of the first brake pedal is saved.

Description

Technical Field

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

[0002] The braking system of a tractor is the core subsystem of the tractor, which is related to the safety performance of the tractor during use. The driver realizes the braking of the tractor through the brake. In order to realize the auxiliary driving of the tractor, it is necessary to add an electronic braking method on the basis of the traditional mechanical braking method to form a tractor braking system with both mechanical and electronic control methods. No matter what kind of electronic braking method is used, the basic premise is to accurately obtain the movement conditions of the left and right pedals, and control the electronic braking to execute the formulated braking strategy according to the depths of the left and right pedals being depressed, so as to achieve a better braking effect.

[0003] After retrieval, Patent Document 1 (Chinese invention application, publication number CN116834704A) discloses a braking system for a new energy tractor. Among them, a sensor bracket is installed on the dashboard wall panel of the tractor, and two angle sensors are installed on the sensor bracket. The angle sensors can transmit the rotation angle of the brake pedal to the controller. However, in Patent Document 1, the installation of the angle sensors not only requires a large installation space, but also the center of the rotation axis of the angle sensors is not on the same straight line as the rotation axis of the brake pedal, resulting in low accuracy of the angle sensors.

[0004] Therefore, it is necessary to provide a braking device for a tractor to overcome the defects existing above. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a braking device for a tractor.

[0006] According to one aspect of the utility model, there is provided a braking device for a tractor, comprising: a first brake pedal, the first brake pedal including a first rotating shaft, a first sleeve portion integrally rotating with the first rotating shaft, a first connecting portion fixedly installed on the first sleeve portion, and a first stepping portion provided at the other end of the first connecting portion; a support sleeve, two support sleeves are respectively located on both sides of the first sleeve portion, and both ends of the first rotating shaft are respectively inserted into the two support sleeves; a mounting side plate, the mounting side plate is located outside one of the support sleeves; a first sensor, the stator end of the first sensor is installed on the mounting side plate, and the rotor end of the first sensor passes through the mounting side plate and integrally rotates with the first rotating shaft to monitor the rotation angle of the first brake pedal.

[0007] Preferably, it also includes: a second brake pedal, the second brake pedal includes a second rotating shaft, a second sleeve portion rotating integrally with the second rotating shaft, a second connecting portion fixedly mounted on the second sleeve portion, and a second pedal portion arranged at the other end of the second connecting portion; a supporting sleeve, two supporting sleeves are respectively located on both sides of the second sleeve portion, and the two ends of the second rotating shaft are respectively inserted into the two supporting sleeves; an installing side plate, the installing side plate is located on the outside of a supporting sleeve; a second sensor, the stator end of the second sensor is installed on the installing side plate, and the rotor end of the second sensor passes through the installing side plate and rotates integrally with the second rotating shaft to monitor the rotation angle of the second brake pedal.

[0008] Preferably, the first brake pedal and the second brake pedal are connected via a detachable locking pin.

[0009] Preferably, the locking pin includes: a first slot, the first slot is installed on the upper surface of the first connecting part, and a first mounting hole is provided on the first slot and passes through the upper and lower surfaces of the first slot; a second slot, the second slot is installed on the upper surface of the second connecting part, and the second slot is aligned with the first slot; a connecting plug plate, the connecting plug plate is inserted into the first slot and the second slot along the openings of the first slot and the second slot to achieve the connection between the first slot and the second slot, and a second mounting hole is also provided at the position corresponding to the first mounting hole; a locking pin, the locking pin passes through the first mounting hole and the second mounting hole.

[0010] Preferably, the first sleeve portion is further provided with a first mounting portion, and the first mounting portion is connected to the tractor attachment via a first return spring; the second sleeve portion is further provided with a second mounting portion, and the second mounting portion is connected to the tractor attachment via a second return spring;

[0011] Preferably, the first connecting portion and the second connecting portion are configured as a curved structure with a consistent spacing, so that the first treading portion and the second treading portion are offset to one side of the second treading portion by a predetermined distance.

[0012] Preferably, a limit stopper is further provided on a side of the first treading portion away from the second brake pedal.

[0013] Preferably, a first connecting hole is provided on the first connecting part, a first push rod is rotatably mounted on the first connecting hole, and the first push rod is transmission-connected to the first mechanical brake valve; a second connecting hole is provided on the second connecting part, a second push rod is rotatably mounted on the second connecting hole, and the second push rod is transmission-connected to the second mechanical brake valve.

[0014] Preferably, the first sensor and the second sensor are signal - connected to the control unit, and the control unit is also signal - connected to the first electro - hydraulic brake valve and the second electro - hydraulic brake valve.

[0015] Preferably, it further includes: a handbrake lever, the handbrake lever is connected to the first braking device through a pull - rod structure; and the first brake pedal is drivingly connected to the first braking device.

[0016] Compared with the prior art, the braking device for tractors provided by the present utility model has the following beneficial effects:

[0017] By coaxially arranging the first sensor on the first brake pedal, the present utility model can accurately measure the stepping - stroke information of the first brake pedal, that is, the braking - stroke information. Moreover, the first sensor is located on the mounting side plate, saving the installation space of the first brake pedal. And the first brake pedal is mechanically connected to the first mechanical brake valve, enabling mechanical braking. At the same time, it is signal - connected to the first electro - hydraulic brake valve through the control center, and can also have electro - hydraulic braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further elaborates on the present utility model in detail in conjunction with the drawings and specific embodiments:

[0019] Figure 1 It is a schematic structural diagram of the braking device in the present utility model.

[0020] Figure 2 It is a schematic structural diagram of the pedal assembly in the present utility model.

[0021] Figure 3 It is an exploded schematic diagram of the pedal assembly in the present utility model.

[0022] Figure 4 It is a hydraulic schematic diagram of the hydraulic braking system in the present utility model.

[0023] Figure 5 It is a hydraulic schematic diagram of the first mechanical brake valve and the second mechanical brake valve in the present utility model.

[0024] Figure 6 It is a hydraulic schematic diagram of the first electro - hydraulic brake valve, the second electro - hydraulic brake valve, the first shuttle valve and the second shuttle valve in the present utility model.

[0025] Explanation of the reference numerals:

[0026] 1. Pedal assembly;

[0027] 11. First brake pedal; 111. First rotating shaft; 112. First sleeve part; 113. First connecting part; 114. First stepping part; 115. First limiting part; 116. First mounting part; 117. First connecting hole; 118. First push rod; 119. Limiting baffle;

[0028] 121. Mounting side plate; 122. Support sleeve;

[0029] 13. First sensor;

[0030] 14. Second brake pedal; 141. Second rotating shaft; 142. Second sleeve part; 143. Second connecting part; 144. Second stepping part; 145. Second limiting part; 146. Second mounting part; 147. Second connecting hole; 148. Second push rod;

[0031] 15. Second sensor;

[0032] 16. Locking pin; 161. First slot; 162. First through hole; 163. Second slot; 164. Connecting plug plate; 165. Second through hole; 166. Locking pin; 167. Holding rod;

[0033] 17. First return spring;

[0034] 18. Second return spring;

[0035] 2. Handbrake assembly;

[0036] 21. Handbrake lever;

[0037] 22. Tie rod structure;

[0038] 3. Hydraulic braking system;

[0039] 31. Fuel tank;

[0040] 32. Oil pump;

[0041] 33a. First mechanical brake; 33b. Second mechanical brake valve; 331. First oil supply port; 332. First oil return port; 333. First working oil port; 334. Second working oil port; 335. Third working oil port;

[0042] 34a. First electro-hydraulic brake valve; 34b. Second electro-hydraulic brake valve; 341. Second oil supply port; 342. Second oil return port; 343. Fourth working oil port;

[0043] 35a. First shuttle valve; 35b. Second shuttle valve;

[0044] 36. Accumulator;

[0045] 37. Relief valve;

[0046] 38a, the first braking device; 38b, the second braking device; 381, the braking oil cylinder; 382, the brake disc. Detailed implementation manners

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0048] To make the drawings concise, only the parts related to the present invention are schematically shown in each drawing, and they do not represent the actual structure of the product. Additionally, to make the drawings concise and easy to understand, in some drawings, for components with the same structure or function, only one of them is schematically shown, or only one of them is labeled. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0049] It should also be further understood that the term "and / or" used in the description of this application and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0050] In this article, it should be noted that unless otherwise clearly specified and defined, 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0051] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will describe the specific implementation manners of the present invention with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings, and other implementation manners can also be obtained.

[0053] Refer to the attached Figure 1, this embodiment provides a braking device, which is mainly applied to a tractor. When a user is sitting on a tractor on the ground, the direction the user faces is defined as the front, the direction the user backs is defined as the rear, the direction on the left hand side is defined as the left, the direction on the right hand side is defined as the right, the direction close to the ground is defined as the bottom, and the direction away from the ground is defined as the top. The braking device includes a braking operation component, a braking execution component, and a control unit. Among them, the pedal assembly 1 is installed on the transmission housing and extends into the cab of the tractor. The braking operation component includes the pedal assembly 1 and the handbrake assembly 2, and the braking execution component is the hydraulic braking system 3.

[0054] Refer to the appendix Figure 2 and the appendix Figure 3 , the pedal assembly 1 includes a first brake pedal 11, a second brake pedal 14, a mounting bracket, a first sensor 13, a second sensor 15, and a locking pin 16.

[0055] Specifically, the first brake pedal 11 includes a first rotating shaft 111, a first sleeve portion 112 integrally rotated with the first rotating shaft 111, a first connecting portion 113 fixedly installed on the first sleeve portion 112, a first stepping portion 114 provided at the other end of the first connecting portion 113, and a first limiting portion 115 provided at one end of the first rotating shaft 111. The second brake pedal 14 includes a second rotating shaft 141, a second sleeve portion 142 integrally rotated with the second rotating shaft 141, a second connecting portion 143 fixedly installed on the second sleeve portion 142, a second stepping portion 144 provided at the other end of the second connecting portion 143, and a second limiting portion 145 provided at one end of the second rotating shaft 141.

[0056] The mounting bracket includes two mounting side plates 121 and at least three supporting sleeves 122. Both ends of the first rotating shaft 111 are respectively inserted into the two supporting sleeves 122, and the first limiting portion 115 passes through one of the supporting sleeves 122; both ends of the second rotating shaft 141 are respectively inserted into the two supporting sleeves 122, and the second limiting portion 145 passes through one of the supporting sleeves 122. All the supporting sleeves 122 are located on the same axis and are fixed by the mounting side plates 121 or other accessories, so that the first brake pedal 11 and the second brake pedal 14 rotate along the axis where the supporting sleeves 122 are located.

[0057] The stator end of the first sensor 13 is mounted on the mounting side plate 121, and the rotor end of the first sensor 13 passes through the mounting side plate 121 and rotates integrally with the first rotating shaft 111. In this embodiment, the rotor end of the first sensor 13 is connected to the first rotating shaft 111 through the first limiting portion 115, and the rotation angle of the first limiting portion 115 can be monitored to obtain the rotation angle of the first brake pedal 11. The stator end of the second sensor 15 is mounted on another mounting side plate 121, and the rotor end of the second sensor 15 passes through the mounting side plate 121 and rotates integrally with the second rotating shaft 141. In this embodiment, the rotor end of the second sensor 15 is connected to the second rotating shaft 141 through the first limiting portion 115, and the rotation angle of the second limiting portion 145 can be monitored to obtain the rotation angle of the second brake pedal 14.

[0058] When the user steps on the first brake pedal 11 and / or the second brake pedal 14, the first brake pedal 11 and / or the second brake pedal 14 rotate about the axis where the support sleeve 122 is located, so that the first limiting portion 115 and / or the second limiting portion 145 change relative to the first sensor 13 and / or the second sensor 15, enabling the first sensor 13 and / or the second sensor 15 to accurately measure the stepping stroke information of the first brake pedal 11 and / or the second brake pedal 14, that is, the braking stroke information. Moreover, since the first sensor 13 and / or the second sensor 15 are located on the mounting side plate 121, the installation space of the first brake pedal 11 and / or the second brake pedal 14 is saved.

[0059] Refer to the appendix Figure 3, the first brake pedal 11 and the second brake pedal 14 are connected by a separable locking pin 16, so that the first brake pedal 11 and the second brake pedal 14 move synchronously; when the locking pin 16 is removed, the first brake pedal 11 and the second brake pedal 14 can move independently and perform braking operations independently. Specifically, the locking pin 16 includes: a first slot 161, a second slot 163, a connecting plate 164 and a locking pin 166. The first slot 161 is installed on the upper surface of the first connecting portion 113, and a first through hole 162 penetrating the upper and lower surfaces of the first slot 161 is provided in the first slot 163; the second slot 163 is installed on the upper surface of the second connecting portion 143, and the second slot 163 is aligned with the first slot 161; the connecting plate 164 is further provided with a second through hole 165 at a position corresponding to the first through hole 162, and the locking pin 166 penetrates the first through hole 162 and the second through hole 165, so that the connecting plate 164 can rotate along the locking pin 166. In order to facilitate the rotation of the connecting plate 164, a holding rod 167 is further provided on one side of the connecting plate 164. When the connecting plate 164 is inserted into the first slot 161 and the second slot 163 along the openings of the first slot 161 and the second slot 163, the connection between the first slot 161 and the second slot 163 can be realized.

[0060] A first mounting portion 116 is further provided on the first sleeve portion 112, and the first mounting portion 116 is connected to the tractor attachment by a first return spring 17; a second mounting portion 146 is further provided on the second sleeve portion 142, and the second mounting portion 146 is connected to the tractor attachment by a second return spring 18; the first return spring 17 and the second return spring 18 can respectively make the first brake pedal 11 and the second brake pedal 14 rotate upward to achieve reset.

[0061] To avoid interference between the first brake pedal 11 and the second brake pedal 14 and the lower instrument panel in the cab, the first connecting portion 113 and the second connecting portion 143 are configured as curved structures with a consistent spacing, so that the first stepping portion 114 and the second stepping portion 144 are offset a predetermined distance toward the second stepping portion 144. At the same time, a limit baffle 119 is further provided on the side of the first stepping portion 114 away from the second brake pedal 14 to play a limiting role and prevent the user from slipping out of the operation area of the first stepping portion 114 during the stepping process and causing misoperation.

[0062] Refer to the appendix Figure 3, a first connection hole 117 is provided on the first connection part 113, and a first push rod 118 is rotatably installed on the first connection hole 117. The first push rod 118 is in transmission connection with the first mechanical brake 33a valve; a second connection hole 147 is provided on the second connection part 143, and a second push rod 148 is rotatably installed on the second connection hole 147. The second push rod 148 is in transmission connection with the second mechanical brake valve 33b. By the rotation of the first connection part 113 and / or the second connection part 143, the first push rod 118 and / or the second push rod 148 is driven to rotate, and further the movement of the spool of the first mechanical brake 33a valve and / or the second mechanical brake valve 33b is pushed, so as to realize the corresponding braking action.

[0063] Meanwhile, the first sensor 13 and the second sensor 15 are in signal connection with the control unit, and the control unit is also in signal connection with the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b. The first sensor 13 and the second sensor 15 transmit the braking stroke information of the first brake pedal 11 and the second brake pedal 14 to the control unit, which is converted into corresponding electrical signals in the control unit to control the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b to realize the oil circuit switching of the hydraulic braking system 3, and further achieve different braking effects.

[0064] The first braking device 38a and the second braking device 38b are brake discs 382 driven by a brake cylinder 381. The action of the brake cylinder 381 is realized through a hydraulic oil circuit, and the brake disc 382 is driven to realize braking. Refer to the appendix Figure 1 , the handbrake assembly 2 includes a handbrake lever 21. The handbrake lever 21 is connected with the first braking device 38a through a pull rod structure 22. The first braking device 38a and the second braking device 38b are driven to execute the braking process through the pull rod structure 22 to realize parking braking.

[0065] Refer to the appendix Figure 4 , the hydraulic braking system 3 includes: an oil tank 31, an oil pump 32, a first mechanical brake 33a valve, a second mechanical brake valve 33b, a first electro-hydraulic brake valve 34a, a second electro-hydraulic brake valve 34b, a first shuttle valve 35a, a second shuttle valve 35b, a first braking device 38a and a second braking device 38b.

[0066] The inlet of the oil pump 32 is connected to the fuel tank 31; the first mechanical brake 33a valve is communicated with the outlet of the oil pump 32. Since the first push rod 118 is in transmission connection with the first mechanical brake 33a valve, the first mechanical brake 33a valve is controlled by the first brake pedal 11. The first electro-hydraulic brake valve 34a is communicated with the outlet of the oil pump 32. The first electro-hydraulic brake valve 34a is arranged in parallel with the first mechanical brake 33a valve, and the control unit is also in signal connection with the first electro-hydraulic brake valve 34a, so that the first electro-hydraulic brake valve 34a is controlled by the control unit of the tractor; the two oil supply ports of the first shuttle valve 35a are respectively connected to the working oil ports of the first mechanical brake 33a valve and the first electro-hydraulic brake valve 34a, and the first shuttle valve 35a can select the oil supply port on the side with larger oil pressure to be communicated with the working oil port; the first braking device 38a is connected to the working oil port of the first shuttle valve 35a and acts on the transmission device on one side of the tractor.

[0067] Similarly, the second mechanical brake valve 33b is communicated with the outlet of the oil pump 32. Since the second push rod 148 is in transmission connection with the second mechanical brake valve 33b, the second mechanical brake valve 33b is controlled by the second brake pedal 14. The second electro-hydraulic brake valve 34b is communicated with the outlet of the oil pump 32. The second electro-hydraulic brake valve 34b is arranged in parallel with the second mechanical brake valve 33b, and the control unit is also in signal connection with the second electro-hydraulic brake valve 34b, so that the second electro-hydraulic brake valve 34b is controlled by the control unit of the tractor; and the second mechanical brake valve 33b and the second electro-hydraulic brake valve 34b are taken as a whole and arranged in parallel with the first mechanical brake 33a valve and the first electro-hydraulic brake valve 34a.

[0068] The two oil supply ports of the second shuttle valve 35b are respectively connected to the working oil ports of the second mechanical brake valve 33b and the second electro-hydraulic brake valve 34b, and the second shuttle valve 35b can select the oil supply port on the side with larger oil pressure to be communicated with the working oil port; the second braking device 38b is connected to the working oil port of the second shuttle valve 35b and acts on the transmission device on the other side of the tractor.

[0069] An accumulator 36 is arranged in parallel on the oil path between the outlet of the oil pump 32 and the oil supply ports of the first mechanical brake 33a valve and the first electro-hydraulic brake valve 34a. The oil path between the outlet of the oil pump 32 and the oil supply ports of the first mechanical brake 33a valve and the first electro-hydraulic brake valve 34a is connected to the fuel tank 31 through a direct-acting overflow valve 37. Among them, the accumulator 36 and the overflow valve 37 play a role in voltage stabilization and protection.

[0070] Refer to the appendix Figure 5, both the first mechanical brake valve 33a and the second mechanical brake valve 33b are three-position five-way valves, and the three-position five-way valve is a proportional valve; the three-position five-way valve includes: a first oil supply port 331, a first oil return port 332, a first working oil port 333, a second working oil port 334, and a third working oil port 335; the first working oil port 333 is connected to the second oil supply port 341 and is connected to the oil supply port of the first shuttle valve 35a or the second shuttle valve 35b, and the third working oil port 335 of the first mechanical brake valve 33a is connected to the third oil port of the second mechanical brake valve 33b; in the normal position, the first oil return port 332 is in communication with the first working oil port 333, and the second working oil port 334 and the third working oil port 335 are in a throttling state. In the first working position, the first oil supply port 331, the first oil return port 332, the first working oil port 333, the second working oil port 334, and the third working oil port 335 are in a throttling state, and the second working oil port 334 and the third working oil port 335 are in a conducting state; in the second working position (braking state), the first oil supply port 331 and the first working oil port 333 are in a conducting state, and the second working oil port 334 and the third working oil port 335 are in a conducting state.

[0071] As the braking stroke increases, the first mechanical brake valve 33a and the second mechanical brake valve 33b enter the first working position, pre-conducting the third working oil port 335 of the first mechanical brake valve 33a and the second mechanical brake valve 33b to balance the hydraulic oil pressure on both sides of the first working oil port 333 and avoid uneven braking. As the braking stroke further increases, the first mechanical brake valve 33a and the second mechanical brake valve 33b enter the second working position, and the first oil supply port 331 is in communication with the first working oil port 333 to supply pressurized hydraulic oil, that is, the tractor enters the braking state. At the same time, a feedback oil circuit is also connected to the first working oil port 333, and the feedback oil circuit is connected to the spring side. When the oil pressure at the first working oil port 333 is too high, the feedback oil circuit can cause the first mechanical brake valve 33a and the second mechanical brake valve 33b to quickly reset and play a pressure relief role.

[0072] Refer to the appendix Figure 6 , both the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b are two-position three-way valves, and the two-position three-way valve is a proportional valve. The two-position three-way valve includes: a second oil supply port 341, a second oil return port 342, and a fourth working oil port 343; the fourth working oil port 343 is also connected to a feedback oil circuit, and the feedback oil circuit is connected to the spring side; in the normal position, the second oil return port 342 is in communication with the fourth working oil port 343; in the working position (braking state), the second oil supply port 341 and the fourth working oil port 343 are in a conducting state; at the same time, when the oil pressure at the fourth working oil port 343 is too high, the feedback oil circuit can achieve the quick reset of the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b and play a pressure relief role.

[0073] The braking device in this embodiment is mainly applied to the auxiliary driving of tractors, such as the headland management of tractors. Now, taking the headland management scenario of tractors as an example, its control method will be briefly described. The method includes:

[0074] S1 - Information acquisition stage: Obtain the braking stroke information of the first brake pedal 11.

[0075] Specifically, in the first time period (i.e., during the recording process), when the user steps on the first brake pedal 11 and / or the second brake pedal 14, the first brake pedal 11 and / or the second brake pedal 14 rotate around the axis where the support sleeve 122 is located, causing a relative change between the first limiting portion 115 and / or the second limiting portion 145 and the first sensor 13 and / or the second sensor 15. The control unit can accurately measure the braking stroke information of the first brake pedal 11 and / or the second brake pedal 14 through the first sensor 13 and / or the second sensor 15. At the same time, the first mechanical brake 33a valve and / or the second mechanical brake valve 33b move the valve core under the action of the first push rod 118 and / or the second push rod 148, conducting hydraulic oil to another oil supply port of the first shuttle valve 35a and / or the second shuttle valve 35b, and the first braking device 38a and / or the second braking device 38b perform braking to complete the corresponding operation actions.

[0076] S2 - Information conversion stage: Transmit the braking stroke information of the first brake pedal 11 to the control unit, and convert it into the control current information of the first electro-hydraulic brake valve 34a according to the preset pedal stroke - current characteristic table.

[0077] Specifically, the pedal stroke - current characteristic table is used to set the conversion ratio between the braking stroke of the first brake pedal 11 and / or the second brake pedal 14 and the control current of the first electro-hydraulic brake valve 34a and / or the second electro-hydraulic brake valve 34b, in order to reproduce the same or similar braking effect as the first mechanical brake 33a valve in the first time period.

[0078] S3 - Electro-hydraulic braking stage: The control unit controls the first electro-hydraulic brake valve 34a to act according to the control current information of the first electro-hydraulic brake valve 34a, and conducts pressure hydraulic oil to an oil supply port of the first shuttle valve 35a.

[0079] Specifically, in the second time period (i.e., during playback), and the first time period and the second time period are different time periods. When the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b are in a bilateral or unilateral braking state, the control unit generates corresponding electrical signals according to the braking stroke information of the first brake pedal 11 and / or the second brake pedal 14 in the first time period, and controls the movement of the valve cores of the first electro-hydraulic brake valve 34a and / or the second electro-hydraulic brake valve 34b. The pressurized hydraulic oil produced by the oil pump 32 passes through the fourth working oil port 343 of the first electro-hydraulic brake valve 34a and / or the second electro-hydraulic brake valve 34b and enters one oil supply port of the first shuttle valve 35a and / or the second shuttle valve 35b. It can be understood that the electro-hydraulic braking stage in this embodiment includes two braking states.

[0080] In the first braking state, the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b are in a bilateral state. The pressurized hydraulic oil produced by the oil pump 32 passes through the fourth working oil ports 343 of the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b and enters one oil supply port of the first shuttle valve 35a and the second shuttle valve 35b respectively.

[0081] In the second braking state, the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b are in a unilateral state. The pressurized hydraulic oil produced by the oil pump 32 passes through the fourth working oil port 343 of the first electro-hydraulic brake valve 34a or the second electro-hydraulic brake valve 34b and enters one oil supply port of the first shuttle valve 35a or the second shuttle valve 35b respectively.

[0082] S4 - Mechanical braking stage: S4 is executed synchronously when S3 is executed. The first brake pedal 11 controls the first mechanical brake 33a valve to execute corresponding actions in real time and conducts the pressurized hydraulic oil to the other oil supply port of the first shuttle valve 35a.

[0083] Specifically, in the second time period (i.e., during playback), the user can also press the first brake pedal 11 and / or the second brake pedal 14 according to the actual operation conditions. The valve cores of the first mechanical brake 33a valve and / or the second mechanical brake valve 33b move under the action of the first push rod 118 and / or the second push rod 148, and conduct the hydraulic oil to the other oil supply port of the first shuttle valve 35a.

[0084] In the first braking state, when the first mechanical braking valve 33a and the second mechanical braking valve 33b are in the double-sided braking state, step S4 includes: S411 - The pressurized hydraulic oil produced by the oil pump 32 passes through the first oil supply port 331 and the first working oil port 333 of the first mechanical braking valve 33a and the second mechanical braking valve 33b, and enters the other oil supply ports of the first shuttle valve 35a and the second shuttle valve 35b respectively; S412 - When S411 is executed, S412 is executed synchronously. The first working oil port 333 of the first mechanical braking valve 33a and the second mechanical braking valve 33b realizes the conduction of the pressurized hydraulic oil through the second working oil port 334 and the third working oil port 335.

[0085] In the second braking state, when the first mechanical braking valve 33a and the second mechanical braking valve 33b are in the single-sided braking state, step S4 includes: S421 - The pressurized hydraulic oil produced by the oil pump 32 passes through the first oil supply port 331 and the first working oil port 333 of the first mechanical braking valve 33a or the second mechanical braking valve 33b, and enters the other oil supply ports of the first shuttle valve 35a or the second shuttle valve 35b respectively; S422 - When S421 is executed, S422 is executed synchronously. The first working oil port 333 of the first mechanical braking valve 33a and the second mechanical braking valve 33b realizes the throttling of the pressurized hydraulic oil through the second working oil port 334 and the third working oil port 335.

[0086] S5 - Braking output stage: The first shuttle valve 35a selects the oil supply port with the larger hydraulic oil pressure on the side to conduct with the working oil port, and the first braking device 38a provides corresponding braking force according to the oil pressure of the working oil port of the first shuttle valve 35a.

[0087] Specifically, since there is hydraulic oil on both sides of the first shuttle valve 35a and / or the second shuttle valve, the first shuttle valve 35a and / or the second shuttle valve 35b judges the oil pressure of the hydraulic oil at the two oil supply ports, and selects the oil supply port with the larger oil pressure to conduct with the working oil port. The first braking device 38a and / or the second braking device 38b provides corresponding braking force according to the oil pressure of the working oil port of the first shuttle valve 35a, so as to achieve a better braking effect.

[0088] The following is an explanation in combination with the specific oil circuit of the hydraulic braking system 3. In the double-sided braking state, and when there is no foot control braking and no electro-hydraulic control braking, when the first mechanical braking valve 33a, the second mechanical braking valve 33b, the first electro-hydraulic braking valve 34a and the second electro-hydraulic braking valve 34b are in the normal state, the pressurized hydraulic oil produced by the oil pump 32 returns to the fuel tank 31 through the direct-acting relief valve 37.

[0089] In the bilateral braking state, when there is no foot control braking and electro-hydraulic control braking, when the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b are in the braking state, the pressurized hydraulic oil produced by the oil pump 32 passes through the second oil supply port 341 and the fourth working oil port 343 of the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b, and then enters one oil supply port of the first shuttle valve 35a and the second shuttle valve 35b, and finally enters the first braking device 38a and the second braking device 38b to achieve electro-hydraulic control braking.

[0090] In the bilateral braking state, when there is foot control braking and no electro-hydraulic control braking, when the first mechanical brake 33a valve and the second mechanical brake valve 33b are in the braking state, the pressurized hydraulic oil produced by the oil pump 32 passes through the first oil supply port 331 and the first working oil port 333 of the first mechanical brake 33a valve and the second mechanical brake valve 33b, and then enters the other oil supply port of the first shuttle valve 35a and the second shuttle valve 35b, and finally enters the first braking device 38a and the second braking device 38b to achieve mechanical control braking. At this time, the first working oil port 333 of the first mechanical brake 33a valve and the second mechanical brake valve 33b realizes the conduction of the pressurized hydraulic oil through the second working oil port 334 and the third working oil port 335, ensuring the pressure balance of the hydraulic oil on both sides of the first braking device 38a and the second braking device 38b, which is particularly important for the tractor during road driving.

[0091] In the bilateral braking state, when there is foot control braking and electro-hydraulic control braking, the pressurized hydraulic oil produced by the oil pump 32 also passes through the fourth working oil port 343 of the first electro-hydraulic brake valve 34a and the second electro-hydraulic brake valve 34b, and then enters one oil supply port of the first shuttle valve 35a and the second shuttle valve 35b. At the same time, the pressurized hydraulic oil produced by the oil pump 32 passes through the first oil supply port 331 and the first working oil port 333 of the first mechanical brake 33a valve and the second mechanical brake valve 33b, and then enters the other oil supply port of the first shuttle valve 35a and the second shuttle valve 35b. The flow of the foot control braking oil circuit and the electro-hydraulic control braking oil circuit converges at the first shuttle valve 35a and the second shuttle valve 35b. The first shuttle valve 35a judges the oil pressure of the hydraulic oil at the two oil supply ports and selects the oil supply port with the larger oil pressure to conduct with the working oil port, and enters the first braking device 38a and the second braking device 38b to achieve the synchronous control of the foot mechanical braking and electro-hydraulic braking.

[0092] In the single-sided braking state, that is, when the locking pin 16 is in the disassembled state, the first brake pedal 11 and the second brake pedal 14 can move independently. For example, when the user steps on the first brake pedal 11, the corresponding first mechanical braking valve 33a is in the braking state. At this time, the second mechanical braking valve 33b is still in the normal position. The first working oil ports 333 of the first mechanical braking valve 33a and the second mechanical braking valve 33b achieve the interception of the pressure hydraulic oil through the second working oil port 334 and the third working oil port 335, realizing independent braking for the left and right channels.

[0093] 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 cover modifications and variations of the present invention falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A braking device for a tractor, characterized in that: include: a first brake pedal, the first brake pedal comprising a first rotating shaft, a first sleeve portion rotating integrally with the first rotating shaft, a first connecting portion fixedly mounted on the first sleeve portion, and a first treading portion arranged at the other end of the first connecting portion; Support sleeves, wherein two support sleeves are respectively located on both sides of the first sleeve portion, and two ends of the first rotating shaft are respectively plugged into the two support sleeves; An installation side plate, wherein the installation side plate is located outside a support sleeve; A first sensor, wherein a stator end of the first sensor is mounted on the mounting side plate, and a rotor end of the first sensor passes through the mounting side plate and rotates integrally with the first rotating shaft to monitor a rotation angle of the first brake pedal.

2. The tractor brake device according to claim 1, characterized in that: Also includes: a second brake pedal, the second brake pedal comprising a second rotating shaft, a second sleeve portion rotating integrally with the second rotating shaft, a second connecting portion fixedly mounted on the second sleeve portion, and a second treading portion arranged at the other end of the second connecting portion; Support sleeves, wherein two support sleeves are respectively located on both sides of the second sleeve portion, and two ends of the second rotating shaft are respectively plugged into the two support sleeves; An installation side plate, wherein the installation side plate is located outside a support sleeve; The second sensor, the stator end of the second sensor is mounted on the mounting side plate, the rotor end of the second sensor passes through the mounting side plate and rotates integrally with the second rotating shaft to monitor the rotation angle of the second brake pedal.

3. The tractor brake device according to claim 2, characterized in that: The first brake pedal and the second brake pedal are connected via a detachable locking pin.

4. The tractor brake device according to claim 3, characterized in that: The locking pin comprises: A first slot, the first slot is installed on the upper surface of the first connecting portion, and the first slot is provided with a first mounting hole penetrating through the upper and lower surfaces of the first slot; a second slot, the second slot being mounted on an upper surface of the second connecting portion, the second slot being aligned with the first slot; A connecting plug plate, which is inserted into the first slot and the second slot along the openings of the first slot and the second slot to achieve connection between the first slot and the second slot, and a second mounting hole is further provided at a position corresponding to the first mounting hole; A locking pin passes through the first mounting hole and the second mounting hole.

5. The tractor brake device according to claim 4, characterized in that: The first sleeve portion is also provided with a first mounting portion, and the first mounting portion is connected to the tractor attachment via a first return spring; The second sleeve portion is also provided with a second mounting portion, and the second mounting portion is connected to the tractor attachment via a second return spring.

6. The tractor brake device according to claim 2, wherein: The first connecting portion and the second connecting portion are configured as a curved structure with a consistent spacing, so that the first treading portion and the second treading portion are offset toward one side of the second treading portion by a predetermined distance.

7. The tractor brake device according to claim 6, characterized in that: A limit stopper is also provided on one side of the first treading portion away from the second brake pedal.

8. The tractor brake device according to claim 2, wherein: The first connecting portion is provided with a first connecting hole, a first push rod is rotatably mounted on the first connecting hole, and the first push rod is transmission-connected to the first mechanical brake valve; The second connecting portion is provided with a second connecting hole, and a second push rod is rotatably mounted on the second connecting hole. The second push rod is transmission-connected to the second mechanical brake valve.

9. The tractor brake device according to claim 2, wherein: The first sensor and the second sensor are connected to the control unit by signal, and the control unit is also connected to the first electro-hydraulic brake valve and the second electro-hydraulic brake valve by signal.

10. The tractor brake device according to claim 1, wherein: Also includes: A handbrake lever is connected to the first brake device via a pull rod structure; and the first brake pedal is transmission-connected to the first brake device.

Images