Tractor gearbox parking braking device

Abstract

The invention belongs to the technical field of tractors, and particularly relates to a tractor gearbox parking braking device which comprises an upper shell and a lower shell, two first connecting seats are fixedly connected to the rear side of the interior of the lower shell, an output gear shaft is rotationally connected between the two first connecting seats, and two second connecting seats are fixedly connected to the middle of the lower shell. An intermediate gear shaft is rotatably connected between the two groups of second connecting seats, two groups of third connecting seats are fixedly connected to the front side of the lower shell, an input gear shaft is rotatably connected between the two groups of third connecting seats, and a brake assembly is fixedly mounted at the left side of the lower shell and the position of the output gear shaft; a detection assembly is fixedly installed on the right side of the lower shell and the input gear shaft. The braking assembly and the detection assembly are used in cooperation, the output gear shaft can be braked in time, the situation that in the parking process, if the output gear shaft of the gearbox rotates, a vehicle possibly moves or slides accidentally is effectively avoided, and the safety in the parking process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tractors, and mainly relates to a parking brake device for a tractor gearbox. Background Art

[0002] Tractors are self-propelled power machines used to pull and drive working machinery to complete various mobile operations. They can also be used as fixed working power. They are composed of engine, transmission, travel, steering, hydraulic suspension, power output, electrical instruments, driving control and traction systems or devices. The engine power is transmitted to the drive wheels through the transmission system to make the tractor move. In real life, the most common ones are rubber belts as the medium for power transmission. According to their functions and uses, tractors are divided into agricultural, industrial and special-purpose tractors; according to the structural type, they are divided into wheeled, crawler, boat-shaped tractors and self-propelled chassis.

[0003] In the application number: 201621442853.1, a tractor parking brake device and a tractor having the same are disclosed, including a hydraulic cylinder, a piston and a piston rod, the hydraulic cylinder is divided into a hydraulic area and a pressure-free area by the piston rod, the hydraulic area is hydraulically connected to the tractor's normal pressure hydraulic system, when the tractor is started, the pressure of the hydraulic area is equal to or greater than the elastic force of the piston elastic driving component, when the tractor is turned off, the pressure of the hydraulic area is zero; the other side of the brake control end is connected to the brake rocker arm through a return elastic component, and the elastic force direction of the return elastic component is consistent with the braking direction of the brake device. However, the braking method of the hydraulic system controlling the friction plate in the application may be insufficient when the tractor is towing a trailer for transportation, especially when driving on a downhill or uphill section, decelerating or parking on a slope. The braking force of the parking device may be insufficient. When the tractor is braked, the trailer needs to be braked in time, otherwise the fully loaded trailer will impact the tractor due to inertia, causing a personal safety accident. Therefore, the tractor with a matching trailer has a particularly important requirement for the braking performance of the trailer. Summary of the invention

[0004] The object of the present invention is to provide a parking brake device for a tractor gearbox, so as to solve the problem in the prior art that when a tractor is towing a trailer for transportation, especially when traveling on a downhill or uphill road, decelerating or parking on a slope, the trailer needs to be braked in time while the tractor is braking, otherwise the fully loaded trailer may impact the tractor due to inertia, causing a personal safety accident. Therefore, the tractor equipped with the trailer has a particularly important requirement for the braking performance of the trailer.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a parking brake device for a tractor gearbox, comprising an upper shell and a lower shell, which are fixedly connected by bolts; two groups of first connecting seats are connected to the rear side of the interior of the lower shell, and an output gear shaft is rotatably connected between the two groups of first connecting seats, and two groups of second connecting seats are also connected to the middle of the lower shell, and an intermediate gear shaft is rotatably connected between the two groups of second connecting seats; two groups of third connecting seats are connected to the front side of the lower shell, and an input gear shaft is rotatably connected between the two groups of third connecting seats; the input gear shaft, the output gear shaft and the intermediate gear shaft are all connected by gear meshing transmission; a brake assembly is arranged at one side of the lower shell and the position of the output gear shaft; and a detection assembly is arranged at the other side of the lower shell and the position of the input gear shaft.

[0006] The detection assembly includes a mounting plate, the bottom surface of which is provided with a plurality of evenly distributed support rods; the mounting plate is connected to the lower shell body through the support rods; the top surface of the mounting plate is provided with a rotating sleeve; the rotating sleeve is a hollow ring sleeve, and a synchronous gear ring is provided on the inner wall of the ring.

[0007] The top surface of the mounting plate and the inner side of the synchronous gear ring are fixedly connected with uniformly distributed tubular motors, and the outer output ends of the tubular motors are connected with driving gears; the driving gears and the synchronous gear ring are meshed with each other; two connecting rods are fixed at the top surface of the mounting plate and the position of the tubular motor, and the ends of the two connecting rods are fixedly connected to limiting blocks.

[0008] An L-shaped groove is formed inside the limit block, and a uniformly distributed moving rack is slidably connected inside the L-shaped groove; a brush is fixedly connected to the end of the moving rack, and the moving rack is meshed with the driving gear; a protective cover is provided on the outer periphery of the top surface of the mounting plate, and a controller is provided on the top surface of the protective cover; a through groove for the moving rack to pass through is formed at a position corresponding to the outer periphery of the protective cover and the moving rack; a through hole for the input gear shaft to pass through is formed in the middle of the mounting plate.

[0009] The brake assembly includes a fixed base plate, which is connected to the lower side of the lower shell body, and the upper surface of the fixed base plate is provided with symmetrically arranged movable slide grooves; a guide groove is provided on the side of the movable slide groove away from the lower shell body, and a fixed strip is slidably connected inside the movable slide groove; snap-in holes are provided on the left and right sides of the fixed base plate, and the snap-in holes are connected to the movable slide groove; a mounting hole is provided on the side of the fixing strip close to the snap-in hole; a compression spring is arranged inside the mounting hole, and the end of the compression spring is connected to a limiting column.

[0010] A brake box is arranged above the fixing bar, and symmetrically arranged connecting ears are arranged on both sides of the top surface of the brake box; the connecting ears are connected to one side of the upper shell; buffer grooves are opened above the connecting ears, and the connecting ears are connected to the top surface of the brake box through bolts; a brake disc is arranged inside the brake box, and a connecting key is fixedly connected to the inner side of the brake disc; the brake disc is connected to the output gear shaft through the connecting key; a threading hole is opened through the surface of the side plate of the brake box.

[0011] A first fixed seat is provided at the upper end of one side of the brake box near the upper shell; a first rotating shaft is rotatably connected to one side of the first fixed seat; a first connecting rod is connected to the other end of the first rotating shaft; a first friction pad is connected to the lower middle part of the first connecting rod; a fourth connecting rod is rotatably connected to one end of the first connecting rod away from the first rotating shaft; and the third connecting rod is rotatably connected to the lower end of the fourth connecting rod.

[0012] A second fixed seat is provided at the lower end of one side of the inner part of the brake box close to the upper shell body; a second rotating shaft is rotatably connected to one side of the second fixed seat; the other end of the second rotating shaft is connected to the second connecting rod; a second friction pad is connected to the upper middle part of the second connecting rod; the end of the second connecting rod away from the fourth connecting rod is rotatably connected to the fifth connecting rod; the lower end of the fifth connecting rod is rotatably connected to the third connecting rod, and a third rotating shaft is connected to the middle part of the third connecting rod; the end of the third rotating shaft away from the third connecting rod is rotatably connected to the third fixed seat.

[0013] Connecting blocks are provided at both upper and lower ends of the rear side plate inside the brake box; threaded rods and guide rods are arranged vertically symmetrically between the connecting blocks, and movable bars are passed through the threaded rods and the guide rods; the movable bars are connected to the threaded rods by threads and are slidably connected to the surface of the guide rods; one end of the guide rod is rotatably connected to the end of the third connecting rod away from the fifth connecting rod, and a servo motor is fixedly installed above the upper connecting block; the output end of the servo motor passes through the upper connecting block and is fixedly connected to the upper end of the threaded rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a tubular motor to drive the driving gear to rotate so that the moving rack approaches or moves away from one side of the input gear shaft. Under the synchronous drive of the synchronous gear ring, the three groups of moving racks can move synchronously. The synchronous drive of the synchronous gear ring further enhances the stability and accuracy of the system, so that the three groups of moving racks can move synchronously and accurately, and thus can adapt to the input gear shafts of gearboxes with different diameters. This adaptability enables the device to be widely used in various types of gearboxes, improving its versatility and practicality.

[0015] 2. The present invention detects the rotation speed of the input gear shaft of the gearbox by setting a detection component. When it is detected that the input gear shaft stops rotating, the controller controls the output end of the servo motor to drive the threaded rod to rotate. The threaded rod rotates under the threaded matching relationship to move the moving bar downward. When the moving bar moves downward, the third connecting rod will rotate around the third rotating shaft, thereby pushing the second connecting rod upward to rotate around the second rotating shaft through the fifth connecting rod, so that the second friction pad abuts against the lower side of the brake disc. When the third connecting rod moves downward, the first connecting rod will be pulled by the fourth connecting rod to rotate around the first rotating shaft, so that the first friction pad abuts against the upper side of the brake disc, thereby braking. By timely braking the output gear shaft, the situation that the vehicle may accidentally move or slide if the output gear shaft of the gearbox rotates during parking is effectively avoided, thereby improving the safety during parking. By timely braking, the gears and bearings inside the gearbox and other parts that need to withstand greater force and wear during operation can be protected, thereby improving the service life and performance of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The axonometric Figure 1 ; Figure 2 The axonometric Figure 2 ; Figure 3 It is a schematic diagram of the internal structure of the lower shell in the present invention; Figure 4 It is an exploded view of the detection component in the present invention; Figure 5 for Figure 4 A partial enlarged view of the middle A; Figure 6 It is a schematic diagram of the structure of the movable rack in the present invention; Figure 7 It is a schematic diagram of the structure of the brake assembly in the present invention; Figure 8 The internal structure of the brake box in the present invention is shown in FIG. Figure 1 ; Fig. 9 The internal structure of the brake box in the present invention is shown in FIG. Figure 2 ; Fig.10 It is a schematic diagram of the structure of the braking part of the braking assembly in the present invention; Fig.11 An exploded view of the fixed base plate and the fixed bar in the present invention; Fig.12 for Fig.11 A partial enlarged view of point B in the middle.

[0017] The numbers in the figure are: 1. Upper shell; 2. Lower shell; 3. First connecting seat; 4. Output gear shaft; 5. Second connecting seat; 6. Intermediate gear shaft; 7. Third connecting seat; 8. Input gear shaft; 9. Detection assembly; 901. Mounting plate; 902. Support rod; 903. Tubular motor; 904. Driving gear; 905. Rotating sleeve; 906. Synchronous gear ring; 907. Connecting rod; 908. Through hole; 909. Limit block; 910. L-shaped groove; 911. Moving rack; 912. Protective cover; 913. Controller; 914. Through groove; 915. Brush; 10. Brake assembly; 1001. Fixed bottom plate; 1002. Brake box; 1003. Connecting ear; 1004. Buffer groove; 1005. Threading hole; 1006. Moving slide groove; 1 007, guide groove; 1008, fixing bar; 1009, mounting hole; 1010, compression spring; 1011, limiting column; 1012, snap-in hole; 1013, first fixing seat; 1014, first rotating shaft; 1015, first connecting rod; 1016, first friction pad; 1017, second fixing seat; 1018, second rotating shaft; 1019, second connecting rod; 1020, second friction pad; 1021, brake disc; 1022, connecting key; 1023, third fixing seat; 1024, third rotating shaft; 1025, third connecting rod; 1026, fourth connecting rod; 1027, fifth connecting rod; 1028, connecting block; 1029, threaded rod; 1030, guide rod; 1031, moving bar; 1032, servo motor. DETAILED DESCRIPTION

[0018] The present invention is described with reference to the accompanying drawings.

[0019] like Figure 1-Figure 12 As shown, a parking brake device for a tractor gearbox comprises an upper shell 1 and a lower shell 2, wherein the upper shell 1 and the lower shell 2 are fixedly connected by bolts; two groups of first connecting seats 3 are connected to the rear side of the interior of the lower shell 2, an output gear shaft 4 is rotatably connected between the two groups of first connecting seats 3, two groups of second connecting seats 5 are also connected to the middle part of the lower shell 2, and an intermediate gear shaft 6 is rotatably connected between the two groups of second connecting seats 5; two groups of third connecting seats 7 are connected to the front side of the lower shell 2, an input gear shaft 8 is rotatably connected between the two groups of third connecting seats 7; the input gear shaft 8, the output gear shaft 4 and the intermediate gear shaft 6 are all connected by gear meshing transmission; a brake assembly 10 is provided at one side of the lower shell 2 and the position of the output gear shaft 4; and a detection assembly 9 is provided at the other side of the lower shell 2 and the position of the input gear shaft 8.

[0020] The detection assembly 9 includes a mounting plate 901, and a plurality of evenly distributed support rods 902 are arranged on the bottom surface of the mounting plate 901; the mounting plate 901 is connected to the lower shell 2 through the support rods 902; a rotating sleeve 905 is arranged on the top surface of the mounting plate 901; the rotating sleeve 905 is a hollow ring sleeve, and a synchronous gear ring 906 is arranged on the inner wall of the ring; evenly distributed tubular motors 903 are fixedly connected to the top surface of the mounting plate 901 and the inner side of the synchronous gear ring 906, and the outer output ends of the tubular motors 903 are connected to driving gears 904; the driving gears 904 and the synchronous gear ring 906 are meshed with each other; two connecting rods 907 are fixed at the top surface of the mounting plate 901 and the position of the tubular motor 903, and the ends of the two connecting rods 907 are fixedly connected to the limiting blocks 909; The limit block 909 is provided with an L-shaped groove 910, and the L-shaped groove 910 is slidably connected with a uniformly distributed moving rack 911; the moving rack 911 is arranged in three groups; the end of the moving rack 911 is fixedly connected with a brush 915, and the moving rack 911 is meshed with the driving gear 904; the detection component 9 drives the driving gear 904 to rotate through the tubular motor 903, thereby driving the moving rack 911 to move, thereby realizing the accurate detection of the rotation speed of the input gear shaft 8. This design not only improves the accuracy and sensitivity of the detection, but also has a compact structure, is easy to install and maintain, and further enhances the stability and accuracy of the system, so that the three groups of moving racks can move synchronously and accurately, thereby being able to adapt to the input gear shaft of the gearbox with different diameters. This adaptability enables the device to be widely used in various gearbox types, improving its versatility and practicality. At the same time, the setting of the brush 915 can transmit the detection information to the controller 913 in real time, providing reliable data support for subsequent braking control.

[0021] A protective cover 912 is provided on the periphery of the top surface of the mounting plate 901, and a controller 913 is provided on the top surface of the protective cover 912; a through slot 914 for the moving rack 911 to pass through is provided at a position corresponding to the outer periphery of the protective cover 912 and the moving rack 911; a through hole 908 for the input gear shaft 8 to pass through is provided through the middle of the mounting plate 901; the provision of the protective cover 912 can effectively protect the electrical components inside the detection component 9 from interference and damage from the external environment, thereby improving the reliability and service life of the equipment, and the controller 913 can receive the information transmitted by the detection component 9, and control the operation of the servo motor 1032 according to a preset logical relationship, thereby realizing precise control of the parking brake device.

[0022] The brake assembly 10 includes a fixed base plate 1001, which is connected to the lower side of the lower shell 2, and the upper surface of the fixed base plate 1001 is provided with symmetrically arranged movable slide grooves 1006; the movable slide groove 1006 is provided with a guide groove 1007 on the side away from the lower shell 2, and the movable slide groove 1006 is slidably connected with a fixed bar 1008; the left and right sides of the fixed base plate 1001 are provided with snap-in holes 1012, and the snap-in holes 1012 are connected to the movable slide groove 1006; the fixing bar 1008 is provided with a mounting hole 1009 on the side close to the snap-in hole 1012; a compression spring 1010 is arranged inside the mounting hole 1009, and the end of the compression spring 1010 is connected to a limiting column 1011.

[0023] A brake box 1002 is arranged above the fixing strip 1008, and symmetrically arranged connecting ears 1003 are arranged on both sides of the top surface of the brake box 1002; the connecting ears 1003 are connected to one side of the upper shell 1; buffer grooves 1004 are provided above the connecting ears 1003, and the connecting ears 1003 are connected to the top surface of the brake box 1002 by bolts; a brake disc 1021 is arranged inside the brake box 1002, and a connecting key 1022 is fixedly connected to the inner side of the brake disc 1021; the brake disc 1021 is connected to the output gear shaft 4 through the connecting key 1022; a threading hole 1005 is opened on the side plate surface of the brake box 1002; the brake box 10 A first fixed seat 1013 is provided at the upper end of one side of the interior of 02 close to the upper shell 1; one side of the first fixed seat 1013 is rotatably connected to the first rotating shaft 1014; the other end of the first rotating shaft 1014 is connected to the first connecting rod 1015; the first friction pad 1016 is connected to the lower middle part of the first connecting rod 1015; the end of the first connecting rod 1015 away from the first rotating shaft 1014 is rotatably connected to the fourth connecting rod 1026; the lower end of the fourth connecting rod 1026 is rotatably connected to the third connecting rod 1025; the brake assembly 10 mainly realizes the parking brake function through the abutment of the first friction pad 1016 and the second friction pad 1020 with the brake disc 1021.

[0024] A second fixing seat 1017 is provided at the lower end of one side of the inner part of the brake box 1002 close to the upper shell 1; a second rotating shaft 1018 is rotatably connected to one side of the second fixing seat 1017; a second connecting rod 1019 is connected to the other end of the second rotating shaft 1018; a second friction pad 1020 is connected to the upper middle part of the second connecting rod 1019; a fifth connecting rod 1027 is rotatably connected to the end of the second connecting rod 1019 away from the fourth connecting rod 1026; the lower end of the fifth connecting rod 1027 is rotatably connected to the third connecting rod 1025, and a third rotating shaft 1024 is connected to the middle part of the third connecting rod 1025; One end of the shaft 1024 away from the third connecting rod 1025 is rotatably connected to the third fixed seat 1023; the third fixed seat 1023 is fixedly connected to the middle of the inner wall of the brake box 1002, and the setting of the connecting rod system can realize precise control of the first friction pad 1016 and the second friction pad 1020, ensuring that they can abut against the brake disc 1021 at the same time, thereby realizing the parking brake function; this design not only improves the braking efficiency, but also has a compact structure and is easy to install and maintain; at the same time, the connecting rod system also has a certain buffering and shock absorbing effect, which can reduce the impact and vibration during the parking brake process, and improve the comfort and service life of the equipment.

[0025] The brake box 1002 is provided with connecting blocks 1028 at both upper and lower ends of the rear side plate inside; a threaded rod 1029 and a guide rod 1030 are arranged vertically symmetrically between the connecting blocks 1028, and a moving bar 1031 is passed through the threaded rod 1029 and the guide rod 1030; the moving bar 1031 is connected to the threaded rod 1029 by threads and is slidably connected to the surface of the guide rod 1030; one end of the guide rod 1030 is rotatably connected to the end of the third connecting rod 1025 away from the fifth connecting rod 1027, and a servo motor 1032 is fixedly installed above the upper end connecting block 1028; the output end of the servo motor 1032 passes through the upper end connecting block 1028 and is fixedly connected to the upper end of the threaded rod 1029; when it is detected that the input gear shaft 8 stops rotating, the controller 913 controls the output end of the servo motor 1032 to drive the threaded rod 1029 to rotate, and the threaded rod 1029 rotates on the screw Under the matching relationship of the threads, the moving bar 1031 moves downward. When the moving bar 1031 moves downward, the third connecting rod 1025 will rotate around the third rotating shaft 1024, thereby pushing the second connecting rod 1019 upward to rotate around the second rotating shaft 1018 through the fifth connecting rod 1027, so that the second friction pad 1020 abuts against the lower side of the brake disc 1021, and when the third connecting rod 1025 moves downward, it will pull the first connecting rod 1015 to rotate around the first rotating shaft 1014 through the fourth connecting rod 1026, so that the first friction pad 1016 abuts against the upper side of the brake disc 1021, thereby braking; the coordinated use of the servo motor 1032 and the threaded rod 1029 can realize the precise control of the moving bar 1031, thereby realizing the precise adjustment of the first friction pad 1016 and the second friction pad 1020; this design not only improves the accuracy and sensitivity of the braking control, but also has a compact structure and is easy to operate.

[0026] When the present invention is in use: first place the brake box 1002 above the fixed base plate 1001, then align the installation fixing strip 1008 with the movable slide groove 1006 and slide it in. The limiting column 1011 will squeeze the compression spring 1010 under the action of the guide groove 1007 and be received in the installation hole 1009. After sliding to the preset position, under the elastic force of the compression spring 1010, a part of the limiting column 1011 will enter the clamping hole 1012 for limiting. At this time, the brake box 1002 and the connecting ear 1003 are connected together by bolts, and then the brake disc 1021 is connected to the output gear shaft 4 and the position is adjusted. The tubular motor 903 drives the driving gear 904 to rotate so that the movable rack 911 approaches or moves away from one side of the input gear shaft 8. Under the synchronous drive of the synchronous gear ring 906, the three sets of movable racks 911 can move synchronously. The rotation speed of the input gear shaft 8 is detected by the brush 915, and the information after detection is transmitted through the wire The controller 913 controls the output end of the servo motor 1032 to drive the threaded rod 1029 to rotate. The threaded rod 1029 rotates under the threaded matching relationship to move the moving bar 1031 downward. When the moving bar 1031 moves downward, the third connecting rod 1025 rotates around the third rotating shaft 1024, thereby pushing the second connecting rod 1019 upward around the second rotating shaft 1024 through the fifth connecting rod 1027. The shaft 1018 rotates, so that the second friction pad 1020 abuts against the lower side of the brake disc 1021, and when the third link 1025 moves downward, it pulls the first link 1015 to rotate around the first rotating shaft 1014 through the fourth link 1026, so that the first friction pad 1016 abuts against the upper side of the brake disc 1021. The abutment of the first friction pad 1016 and the second friction pad 1020 with the brake disc 1021 prevents the transmission shaft of the gearbox from rotating when parking. This effectively avoids the situation that if the output gear shaft of the gearbox rotates when parking, the vehicle may accidentally move or slide, thereby improving the safety of parking.

[0027] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A parking brake device for a tractor transmission, comprising an upper housing (1) and a lower housing (2), wherein the upper housing (1) and the lower housing (2) are fixedly connected by bolts; characterized in that: Two groups of first connection seats (3) are connected to the rear side of the lower housing (2), an output gear shaft (4) is rotatably connected between the two groups of first connection seats (3), two groups of second connection seats (5) are also connected to the middle of the lower housing (2), and an intermediate gear shaft (6) is rotatably connected between the two groups of second connection seats (5); two groups of third connection seats (7) are connected to the front side of the lower housing (2), an input gear shaft (8) is rotatably connected between the two groups of third connection seats (7); the input gear shaft (8), the output gear shaft (4) and the intermediate gear shaft (6) are all connected through gear meshing transmission; a brake assembly (10) is provided at one side of the lower housing (2) and the output gear shaft (4); and a detection assembly (9) is provided at the other side of the lower housing (2) and the input gear shaft (8).

2. The tractor gearbox parking brake device according to claim 1, characterized in that: The detection assembly (9) comprises a mounting plate (901), the bottom surface of which is provided with a plurality of evenly distributed support rods (902); the mounting plate (901) is connected to the lower housing (2) via the support rods (902); the top surface of the mounting plate (901) is provided with a rotating sleeve (905); the rotating sleeve (905) is a hollow ring sleeve, and a synchronous gear ring (906) is provided on the inner wall of the ring.

3. The tractor gearbox parking brake device according to claim 2, characterized in that: Uniformly distributed tubular motors (903) are fixedly connected to the top surface of the mounting plate (901) and the inner side of the synchronous gear ring (906), and the outer output ends of the tubular motors (903) are connected to driving gears (904); the driving gears (904) and the synchronous gear ring (906) are meshed with each other; two connecting rods (907) are fixed at the top surface of the mounting plate (901) and the position of the tubular motor (903), and the ends of the two connecting rods (907) are fixedly connected to limiting blocks (909).

4. The tractor gearbox parking brake device according to claim 3, characterized in that: An L-shaped groove (910) is provided inside the limit block (909), and evenly distributed moving racks (911) are slidably connected inside the L-shaped groove (910); a brush (915) is fixedly connected to the end of the moving rack (911), and the moving rack (911) is meshed with the driving gear (904).

5. The tractor transmission parking brake device according to claim 2, characterized in that: A protective cover (912) is provided on the outer periphery of the top surface of the mounting plate (901), and a controller (913) is provided on the top surface of the protective cover (912); a through slot (914) for the moving rack (911) to pass through is provided at a position corresponding to the outer periphery of the protective cover (912) and the moving rack (911); and a through hole (908) for the input gear shaft (8) to pass through is provided through the middle of the mounting plate (901).

6. The tractor transmission parking brake device according to claim 1, characterized in that: The brake assembly (10) comprises a fixed base plate (1001), the fixed base plate (1001) being connected to the lower side of a lower shell (2), and the upper surface of the fixed base plate (1001) is provided with symmetrically arranged moving slide grooves (1006); a guide groove (1007) is provided on a side of the moving slide groove (1006) away from the lower shell (2), and a fixing bar (1008) is slidably connected inside the moving slide groove (1006); a clamping hole (1012) is provided on both the left and right sides of the fixed base plate (1001), and the clamping hole (1012) is connected to the moving slide groove (1006); a mounting hole (1009) is provided on a side of the fixing bar (1008) close to the clamping hole (1012); a compression spring (1010) is provided inside the mounting hole (1009), and the end of the compression spring (1010) is connected to a limiting column (1011).

7. The tractor transmission parking brake device according to claim 6, characterized in that: A brake box (1002) is arranged above the fixing strip (1008), and symmetrically arranged connecting ears (1003) are arranged on both sides of the top surface of the brake box (1002); the connecting ears (1003) are connected to one side of the upper shell (1); a buffer groove (1004) is opened above the connecting ears (1003), and the connecting ears (1003) are connected to the top surface of the brake box (1002) through bolts; a brake disc (1021) is arranged inside the brake box (1002), and a connecting key (1022) is fixedly connected to the inner side of the brake disc (1021); the brake disc (1021) is connected to the output gear shaft (4) through the connecting key (1022); and a threading hole (1005) is opened through the surface of the side plate of the brake box (1002).

8. The tractor transmission parking brake device according to claim 7, characterized in that: A first fixing seat (1013) is provided at the upper end of one side of the brake box (1002) close to the upper shell (1); one side of the first fixing seat (1013) is rotatably connected to a first rotating shaft (1014); the other end of the first rotating shaft (1014) is connected to a first connecting rod (1015); a first friction pad (1016) is connected to the lower middle part of the first connecting rod (1015); an end of the first connecting rod (1015) away from the first rotating shaft (1014) is rotatably connected to a fourth connecting rod (1026); and the lower end of the fourth connecting rod (1026) is rotatably connected to the third connecting rod (1025).

9. The tractor transmission parking brake device according to claim 7, characterized in that: A second fixing seat (1017) is provided at the lower end of one side of the brake box (1002) close to the upper shell (1); a second rotating shaft (1018) is rotatably connected to one side of the second fixing seat (1017); the other end of the second rotating shaft (1018) is connected to a second connecting rod (1019); a second friction pad (1020) is connected to the upper middle part of the second connecting rod (1019); an end of the second connecting rod (1019) away from the fourth connecting rod (1026) is rotatably connected to a fifth connecting rod (1027); the lower end of the fifth connecting rod (1027) is rotatably connected to the third connecting rod (1025), and a third rotating shaft (1024) is connected to the middle part of the third connecting rod (1025); an end of the third rotating shaft (1024) away from the third connecting rod (1025) is rotatably connected to a third fixing seat (1023).

10. The tractor transmission parking brake device according to claim 7, characterized in that: The brake box (1002) is provided with connection blocks (1028) at both upper and lower ends of the rear side plate inside; threaded rods (1029) and guide rods (1030) are arranged vertically symmetrically between the connection blocks (1028), and moving bars (1031) are passed through the threaded rods (1029) and the guide rods (1030); the moving bars (1031) are connected to the threaded rods (1029) by threads, and are slidably connected to the surface of the guide rods (1030); one end of the guide rod (1030) is rotatably connected to an end of the third connecting rod (1025) away from the fifth connecting rod (1027), and a servo motor (1032) is fixedly installed above the upper connection block (1028); the output end of the servo motor (1032) passes through the upper connection block (1028) and is fixedly connected to the upper end of the threaded rod (1029).

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