Electric control braking device of agricultural gearbox

Abstract

An electric control brake device of an agricultural gearbox comprises a motor, an arm plate, a pull wire, a brake drum, a flange plate, two brake shoes, a fixing shaft, a cam rotating shaft, a shoe return spring, a brake mounting seat, a brake pull rod, a pull rod return spring and a sealing cover, one end of the arm plate is fixed to an output shaft of the motor, and a spline groove is formed in a through hole in the center of the flange plate; the brake drum is connected with an output shaft spline of a gearbox and is axially fixed by a nut, the brake drum and the flange plate are coaxially connected through a bolt, two brake shoes are arranged between the brake drum and the brake mounting seat, the brake mounting seat and the sealing cover are coaxially connected through a bolt, and the sealing cover is fixed on a gearbox shell. According to the utility model, the conversion of two functional positions of a braking state and a free state is realized by changing the rotating position of the motor, and the brake part is applied to the output shaft of the gearbox and in the middle of a transmission system of the whole machine, so that the brake performance is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery, in particular to an electric control braking device of an agricultural gearbox. Background Art

[0002] The electronically controlled brake system for agricultural machinery is an indispensable intelligent control component in modern agricultural machinery. It uses electronic technology to precisely control the braking system of agricultural machinery, improving its operational performance and safety. The control components of the transmissions commonly used in agricultural machinery on the market are mostly mechanical, which is not in line with the future trend of intelligent driving. In the context of environmental protection and labor cost savings, this utility model improves on the existing mechanical brake system by electronically controlling it, achieving an electronically controlled brake structure that meets the design requirements of future unmanned intelligent driving. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the purpose of the present invention is to provide an electronically controlled braking device for an agricultural gearbox, which solves the technical problem of realizing an intelligent control function based on the existing mechanical braking structure.

[0004] The utility model is realized through the following technical solutions:

[0005] An electric control braking device for an agricultural gearbox, comprising a motor, an arm plate, a pull cable, a brake drum, a flange, two brake shoes, a fixed shaft, a cam shaft, a shoe return spring, a brake mounting seat, a brake pull rod, a pull rod return spring and a sealing cover, one end of the arm plate is fixed to the output shaft of the motor, the centers of the brake drum, the flange, the brake mounting seat and the sealing cover are all provided with a through hole for the output shaft of the gearbox to pass through, the through hole in the center of the flange is provided with a spline groove, which is spline-connected to the output shaft of the gearbox and axially fixed with a nut, the brake drum and the flange are coaxially connected by bolts, two brake shoes are provided between the brake drum and the brake mounting seat, the two brake shoes are symmetrically arranged along the inner circumference of the brake drum, the two brake shoes are connected by a shoe return spring, one of the two brake shoes Both ends are constructed as half holes with smooth surfaces, which cooperate to form a circular hole. The fixed shaft is inserted into the above-mentioned circular hole and the corresponding first mounting hole on the brake mounting seat in sequence. The brake mounting seat is circumferentially provided with a wire fixing portion and a hanging hole. The disk surface of the brake mounting seat is provided with a shaft sleeve portion. One end of the brake rod is provided with a second mounting hole. The cam shaft is inserted into the other ends of the two brake shoes, the shaft sleeve portion, and the second mounting hole in sequence. The two ends of the wire are respectively hinged to the free end of the arm plate and the other end of the brake rod. The wire is provided with a threaded sleeve, which passes through and is fixed to the wire fixing portion with a nut. A rod return spring is connected between the hanging hole and the second mounting hole. The brake mounting seat and the sealing cover are coaxially connected by bolts, and the sealing cover is fixed to the gearbox housing.

[0006] Preferably, the sealing cover includes an end cover, a skeleton oil seal and a retaining ring. The end cover has two groups of screw holes, each group of screw holes has 4 screw holes, and each group of screw holes is arranged crosswise and circumferentially around the center of the end cover. One group of screw holes corresponds to the screw holes on the brake mounting seat, and the brake mounting seat is installed by passing bolts through it. The other group of screw holes is used to fix the end cover to the corresponding mounting screw holes of the gearbox.

[0007] Preferably, the flange is provided with four mounting holes circumferentially arranged around its through hole, and is matched with four rivet bolts, the rod of the rivet bolt includes a riveted section and a threaded section, the riveted section is interference fit with the above-mentioned mounting hole, and the threaded section is screwed into the screw holes circumferentially arranged around the through hole of the brake drum.

[0008] Preferably, the fixed shaft includes a plane limiting portion, an optical axis portion with a rib and a threaded portion, the optical axis portion is installed in the circular hole, the rib and the plane limiting portion are used together to axially limit the two brake shoes, and the threaded portion is screwed into the first mounting hole.

[0009] Preferably, the other ends of the two brake shoes are constructed as an offset plane structure parallel to the diameter direction of the half hole, and the cam shaft includes a cam portion, a rotating shaft portion, a square limiting portion and a screw portion that are symmetrically milled on both sides. The cam portion is installed between the above-mentioned offset plane structures, the rotating shaft portion is sleeved on the sleeve portion, the second mounting hole is a square hole, which is inserted into the square limiting portion, and the screw portion is fastened to the brake rod with a nut.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] This utility model replaces the existing mechanical structure with an electronically controlled structure. The transition between the braking and free states is achieved by changing the rotational position of the motor. This provides a smooth and impact-free process, offering a method for intelligent control. The brake is applied to the output end (shaft) of the gearbox, in the middle of the entire transmission system, and offers high braking performance. The brake is a dry-type, hub-type structure, requiring minimal modification to the mechanical structure. It is characterized by low cost, good economics, and strong practicality. It also features a simple structure, safety, reliability, and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 This is a schematic structural diagram of the electronically controlled braking device of the agricultural gearbox of the present invention;

[0014] Figure 2 This is a structural diagram of the utility model in which the arm plate is respectively located at the initial position a, the intermediate position b, and the end position c;

[0015] Figure 3 This is a partial structural diagram of the electronically controlled braking device of the agricultural gearbox of the present invention (from the perspective of the brake mounting seat);

[0016] Figure 4 This is a partial structural diagram of the electronically controlled braking device of the agricultural gearbox of the present invention (from the perspective of the brake drum);

[0017] Figure 5 This is an exploded view of the electronically controlled braking device of the agricultural gearbox of the present invention;

[0018] Figure 6 This is a schematic diagram of the three-dimensional structure of the fixed shaft, cam shaft, and brake pull rod installed on the brake mounting seat of the utility model;

[0019] Figure 7 This is a schematic diagram of the installation structure of the brake shoe of the utility model;

[0020] Figure 8 This is a schematic diagram of the three-dimensional structure of the sealing cover of the utility model;

[0021] Figure 9 It is a three-dimensional structural diagram of the flange and riveted bolts of the utility model.

[0022] Among them, the motor 1, the arm plate 2, the pull wire 3, the sheath 301, the brake drum 4, the flange 5, the spline groove 501, the brake shoe 6, the fixed shaft 7, the plane limit part 701, the optical axis part 702, the threaded part 703, the cam shaft 8, the cam part 801, the rotating shaft part 802, the square limit part 803, the screw part 804, the shoe return spring 9, the brake mounting seat 10, the first mounting hole 1001, the pull wire fixing part 1002, the hanging hole 1003, the sleeve part 1004, the brake rod 11, the second mounting hole 1101, the rod return spring 12, the sealing cover 13, the end cover 1301, the skeleton oil seal 1302, the retaining ring 1303, the rivet bolt 14, the riveted section 1401, the threaded section 1402, and the round hole 15. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0024] The technical solution of the present utility model is further described below with reference to the accompanying drawings. Figure 1-9 The invention shows an electrically controlled braking device of an agricultural gearbox, which includes a motor 1, an arm plate 2, a cable 3, a brake drum 4, a flange 5, two brake shoes 6, a fixed shaft 7, a cam shaft 8, a shoe return spring 9, a brake mounting seat 10, a brake pull rod 11, a pull rod return spring 12 and a sealing cover 13.

[0025] One end of the arm plate 2 is fixed to the output shaft of the motor 1. Figure 5The centers of the brake drum 4, flange 5, brake mounting seat 10 and sealing cover 13 are all provided with through holes for the output shaft of the gearbox to pass through. The through hole in the center of the flange 5 is provided with a spline groove 501, which is spline-connected to the output shaft of the gearbox and axially fixed with a nut. The brake drum 4 and the flange 5 are coaxially connected by bolts. Two brake shoes 6 are provided between the brake drum 4 and the brake mounting seat 10. The two brake shoes 6 are symmetrically arranged along the inner circumference of the brake drum 4, and their outer cylindrical surfaces are brake friction materials, which are in contact with the inner circumference of the brake drum 4.

[0026] The two brake shoes 6 are connected by a shoe return spring 9. One end of each shoe is constructed as a smooth half-hole, forming a circular hole 15 between them. The fixed shaft 7 is sequentially inserted into the aforementioned circular hole and the corresponding first mounting hole 1001 on the brake mounting base 10. The brake mounting base 10 is circumferentially provided with a cable fixing portion 1002 and a hooking hole 1003. The disc surface of the brake mounting base 10 is provided with a shaft sleeve 1004. A second mounting hole 1101 is defined at one end of the brake lever 11. The cam shaft 8 is sequentially inserted between the other ends of the two brake shoes 6, through the shaft sleeve 1004, and finally into the second mounting hole 1101. The shoe return spring 9 returns the two brake shoes 6 to their original positions after braking, ensuring the rotation of one end of the two brake shoes 6 and the normal operation of the cam shaft 8 at the other end.

[0027] The two ends of the cable 3 are respectively hinged to the free end of the arm plate 2 and the other end of the brake rod 11. Figure 3 A threaded sheath 301 is provided on the pull wire 3, and the sheath 301 passes through and is fixed to the pull wire fixing part 1002 with a nut, so that the pull wire 3 can move vertically freely at the position of the pull wire fixing part 1002 to ensure smooth operation. A pull rod return spring 12 is connected between the hanging hole 1003 and the second mounting hole 1101 for resetting the brake rod 11.

[0028] Brake mount 10 and sealing cover 13 are coaxially connected by bolts. Sealing cover 13 is fixed to the transmission housing, and the two are relatively stationary. The motor's rotational position is used to switch between the braking and free states. The brake is applied to the transmission's output shaft, in the middle of the transmission's drivetrain, providing superior braking performance.

[0029] like Figure 6 The fixed shaft 7 includes a flat stopper 701, a smooth shaft portion 702 with a flange, and a threaded portion 703. The smooth shaft portion 702 is mounted in the circular hole 15. The flange and the flat stopper 701 together limit the axial position of the two brake shoes 6, allowing the fixed shaft 7 to serve as the swing axis of the two brake shoes 6. The threaded portion 703 is threaded into the first mounting hole 1001 of the brake mounting base 10 and is secured to the brake mounting base 10 via a nut and spring washer.

[0030] like Figure 7 The other ends of the two brake shoes 6 are constructed as an offset plane structure parallel to the diameter direction of the half hole. The cam shaft 8 includes a cam portion 801, a rotating shaft portion 802, a square limiting portion 803 and a screw portion 804 that are symmetrically milled on both sides. The cam portion 801 is installed between the above-mentioned offset plane structures, the rotating shaft portion 802 is sleeved on the shaft sleeve portion 1004, and the second mounting hole 1101 is a square hole that is inserted into the square limiting portion 803. The screw portion 804 is fastened to the brake rod 11 with a nut.

[0031] like Figure 8 The sealing cover 13 includes an end cover 1301, a skeleton oil seal 1302 and a retaining ring 1303. The end cover 1301 has two groups of screw holes, each group of screw holes has 4 screw holes, and each group of screw holes is arranged crosswise and circumferentially around the center of the end cover 1301. One group of screw holes corresponds to the screw holes on the brake mounting seat 10, and the brake mounting seat 10 is installed by bolts passing through. The other group of screw holes is used to fix the end cover 1301 to the corresponding mounting screw holes of the gearbox.

[0032] like Figure 9 The flange 5 has four mounting holes arranged circumferentially around its through-hole, and is fitted with four rivet bolts 14. The shank of each rivet bolt 14 consists of a rivet section 1401 and a threaded section 1402. The rivet section 1401 has an interference fit with the mounting holes, while the threaded section 1402 screws into screw holes arranged circumferentially around the through-hole of the brake drum 4. The flange 5 and brake drum 4 are secured together by nuts and rotate synchronously with the output shaft of the transmission.

[0033] Preferably, the main body of the cable 3 is a steel wire rope with a sheath 301, and both ends of the cable are constructed as riveted joints with pin-hole structures, and are respectively hinged to the free end of the arm plate 2 and the other end of the brake rod 11 through pins. The cable 3 only transmits force in the tensile direction, making the transmission of the cable 3 more stable.

[0034] The motor 1 and the arm plate 2 on its output shaft are the action execution components. Rotating a certain angle will produce displacement changes, such as Figure 2 The main action positions are the starting position a and the ending position b, and the middle position c is a floating position set by the controller and adjusted according to the actual working conditions. Figure 1The driver component (left 1) in the upper right corner controls and drives the motor, achieving power amplification. The controller component (right 1) is a control component with CAN communication capabilities, forming a bidirectional control logic channel with the push button switch box. The driver and controller components are arranged in a distributed manner, connected together via an electrical wiring harness, and can be directly connected in parallel to the entire machine's electrical wiring harness. The electronic control system uses push button switches and controllers via CAN communication, featuring low response delay, low current in the electronic control system, and low energy consumption. Motor 1 uses a brushless DC motor with forward and reverse rotation, high torque, overload protection, and other features. Its rotation process is smooth and impact-free.

[0035] The working principle of this utility model:

[0036] like Figure 1-Figure 4 When the free end of the arm plate 2 on the output shaft of the motor 1 overcomes the tension of the shoe return spring 9 and the pull rod return spring 12, it rotates from the starting position a to the end position c, and is transmitted to the brake pull rod 11 and the cam shaft 8 through the pull wire 3 to form an upward swing angle. The cam portion 801 of the cam shaft 8 acts between the other ends of the two brake shoes 6, causing the two brake shoes 6 to be stretched to both sides around the fixed shaft 7. When the brake friction material on the outer side of the two brake shoes 6 contacts the inner circumference of the rotating brake drum 4, friction resistance is generated, forming a braking force on the brake drum 4. As the motor 1 rotates to the end position c, the braking force formed at this time is the largest; when the motor 1 rotates from the end position c to the starting position a, the two brake shoes 6 return to their initial positions under the joint action of the pull rod return spring 12 and the shoe return spring 9.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electronically controlled braking device for an agricultural gearbox, characterized in that: The invention comprises a motor (1), an arm plate (2), a cable (3), a brake drum (4), a flange (5), two brake shoes (6), a fixed shaft (7), a cam shaft (8), a shoe return spring (9), a brake mounting seat (10), a brake pull rod (11), a pull rod return spring (12) and a sealing cover (13), wherein one end of the arm plate (2) is fixed to the output shaft of the motor (1), and the centers of the brake drum (4), the flange (5), the brake mounting seat (10) and the sealing cover (13) are all provided with a through hole for the output shaft of the gearbox to pass through. The through hole in the center of the flange (5) is provided with a spline groove (501), which is spline-connected to the output shaft of the gearbox and axially fixed by a nut. The brake drum (4) and the flange (5) are coaxially connected by bolts. Two brake shoes (6) are provided between the brake drum (4) and the brake mounting seat (10). The two brake shoes (6) are symmetrically arranged along the inner circumference of the brake drum (4). The two brake shoes (6) are connected by a shoe return spring (9). One end of the two brake shoes (6) is constructed as a half hole with a smooth surface, and they cooperate to form a circular Hole (15), the fixed shaft (7) is sequentially inserted into the above-mentioned circular hole and the first mounting hole (1001) corresponding to the brake mounting seat (10), the circumferential direction of the brake mounting seat (10) is matched with a wire fixing portion (1002) and a hanging hole (1003), the disk surface of the brake mounting seat (10) is matched with a shaft sleeve portion (1004), one end of the brake pull rod (11) is provided with a second mounting hole (1101), the cam shaft (8) is sequentially inserted between the other ends of the two brake shoes (6), the shaft sleeve portion (1004), the second The mounting hole (1101) is provided, and the two ends of the pull wire (3) are respectively hinged to the free end of the arm plate (2) and the other end of the brake rod (11); the pull wire (3) is provided with a threaded sheath (301); the sheath (301) passes through and is fixed to the pull wire fixing part (1002) with a nut; a pull rod return spring (12) is connected between the hanging hole (1003) and the second mounting hole (1101); the brake mounting seat (10) and the sealing cover (13) are coaxially connected by bolts; and the sealing cover (13) is fixed to the gearbox housing.

2. The electronically controlled braking device for an agricultural gearbox according to claim 1, characterized in that: The sealing cover (13) includes an end cover (1301), a skeleton oil seal (1302) and a retaining ring (1303). The end cover (1301) has two groups of screw holes, each group of screw holes has four screw holes, and each group of screw holes is arranged crosswise and arranged circumferentially around the center of the end cover (1301). One group of screw holes corresponds to the screw holes on the brake mounting seat (10) and is installed by bolts passing through. The other group of screw holes is used to fix the end cover (1301) to the corresponding mounting screw holes of the gearbox.

3. The electronically controlled braking device for an agricultural gearbox according to claim 1, characterized in that: The flange (5) is provided with four mounting holes arranged circumferentially around its through hole, and is matched with four rivet bolts (14). The rod of the rivet bolt (14) includes a rivet section (1401) and a threaded section (1402). The rivet section (1401) is interference-fitted with the above-mentioned mounting holes, and the threaded section (1402) is screwed into the screw holes of the brake drum (4) arranged circumferentially around its through hole.

4. The electronically controlled braking device for an agricultural gearbox according to claim 1, characterized in that: The fixed shaft (7) comprises a plane limiting portion (701), an optical axis portion (702) with a retaining edge, and a threaded portion (703); the optical axis portion (702) is installed in the circular hole (15); the retaining edge and the plane limiting portion (701) are used together to axially limit the two brake shoes (6); and the threaded portion (703) is screwed into the first mounting hole (1001).

5. The electronically controlled braking device for an agricultural gearbox according to claim 1, characterized in that: The other ends of the two brake shoes (6) are constructed as offset plane structures parallel to the diameter direction of the half hole. The cam shaft (8) includes a cam portion (801) milled symmetrically on both sides, a rotating shaft portion (802), a square limiting portion (803) and a screw portion (804). The cam portion (801) is installed between the above-mentioned offset plane structures, the rotating shaft portion (802) is sleeved on the shaft sleeve portion (1004), the second mounting hole (1101) is a square hole, which is inserted into the square limiting portion (803), and the screw portion (804) is fastened to the brake rod (11) with a nut.

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