A brake cylinder for trailer auxiliary

Abstract

The invention discloses a brake cylinder for trailer auxiliary, comprising a cylinder body, an inner core rod, a piston rod assembly and a connecting accessory, wherein the cylinder body is provided with a containing cavity, an exhaust hole A is provided on the peripheral wall of the front end of the cylinder body, and an air inlet hole is provided at the rear end of the cylinder body; the inner core rod is fixedly connected to the cylinder body, and a traction component is fixedly connected to the front end of the inner core rod; the piston rod assembly comprises a piston rod and a piston, the piston rod is provided with a central channel with a front end opening, the inner core rod is accommodated in the central channel, the traction component is led out from the opening of the central channel, a return spring is abutted between the piston and the front end of the cylinder body, the piston seals and separates the containing cavity into a front chamber and a rear chamber, a first sealing member is abutted between the piston and the inner core rod, and the rear chamber and the central channel are isolated by the first sealing member; the connecting accessory is fixedly connected to the output end of the piston rod, and a clamping member is provided on the connecting accessory, and the clamping member is used to clamp the brake pedal. Through this arrangement, the purpose of quickly braking the towed vehicle can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of brake assist devices, and in particular to a brake cylinder for trailer assist. Background Art

[0002] The trailer connection device is generally used to connect the towing vehicle and the towed vehicle. It will be towed by the towing vehicle during use. When the towing vehicle brakes urgently, if the towed vehicle does not brake in time, the front end of the towed vehicle may collide with the rear end of the towing vehicle, which may easily cause safety hazards. Therefore, it is necessary to design a trailer auxiliary braking device so that when the towing vehicle brakes urgently, it can control the towed vehicle to brake quickly. Summary of the invention

[0003] The purpose of the present invention is to provide a brake cylinder for trailer auxiliary, which can quickly control the brake of the towed vehicle by controlling the air intake of the brake cylinder, thereby avoiding the problem of collision with the towing vehicle during towing.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions: a trailer auxiliary brake cylinder, comprising

[0005] The cylinder body is provided with a containing cavity, the front end peripheral wall of the cylinder body is provided with an exhaust hole A, and the rear end of the cylinder body is provided with an air inlet hole;

[0006] The inner core rod is fixedly installed in the cylinder body, and the front end of the inner core rod is fixedly connected with a traction component;

[0007] A piston rod assembly, comprising a piston rod and a piston fixedly connected to the piston rod, the piston rod being provided with a central channel with a front end opening, an inner core rod being accommodated in the central channel, a traction component being led out from the opening of the central channel, a piston being slidably arranged in an accommodating chamber, a return spring being arranged between the piston and the front end of the cylinder body, the piston sealingly separating the accommodating chamber into a front chamber and a rear chamber, the front chamber being connected to an exhaust hole A, the rear chamber being connected to an air inlet hole, a first sealing member being arranged between the piston and the inner core rod, and the rear chamber and the central channel being isolated by the first sealing member;

[0008] The connecting accessory is fixedly connected to the output end of the piston rod. The connecting accessory is provided with a clamping component, and the clamping component is used to clamp the brake pedal.

[0009] Furthermore, a front end cover is fixedly mounted at the opening of the piston rod, and the front end cover is provided with a guide channel with an opening radially contracted rearward, and the traction component is led out from the guide channel to the outside.

[0010] Furthermore, the front end of the piston rod is provided with an external threaded portion and a step portion provided at the rear end of the external threaded portion, and the connecting accessory is threadedly connected to the external threaded portion and abuts against the step portion.

[0011] Furthermore, the front end cover is provided with a flange portion, and the connecting accessory is clamped between the step portion and the flange portion.

[0012] Furthermore, the front end peripheral wall of the piston rod is provided with at least one exhaust hole B, one end of the exhaust hole B is connected to the central channel, and the other end of the exhaust hole B passes through the piston rod. When the piston rod is in the retracted position, the outer end of the exhaust hole B is blocked by the inner wall of the front end cover of the cylinder body.

[0013] Furthermore, a mounting cavity is provided at the tail of the piston, a linear bearing is fixed in the mounting cavity, and the linear bearing is sleeved on the outer periphery of the inner core rod.

[0014] Furthermore, the tail of the inner core rod is fixedly connected to the cylinder body by a fastener, and at least one air intake channel is provided at the tail of the cylinder body corresponding to the outer periphery of the inner core rod, and the air intake channel connects the air intake hole and the rear chamber.

[0015] Furthermore, a wear-resistant ring is provided on the outer periphery of the piston, and the outer periphery of the wear-resistant ring is slidably matched with the inner wall of the cylinder body.

[0016] Furthermore, the clamping component includes a first clamping block and a second clamping block, and the first clamping block and the second clamping block clamp the brake pedal through bolts.

[0017] Furthermore, the traction component includes a connecting portion and a flexible connecting piece, the flexible connecting piece is made of high-strength material, one end of the flexible connecting piece is fixedly connected to the inner core rod through the connecting portion, and the other end of the flexible connecting piece is connected to the rear of the tractor.

[0018] In summary, the present invention has the following beneficial effects: the trailer auxiliary brake cylinder of the present invention controls the air intake of the brake cylinder to quickly control the brake of the towed vehicle, thereby avoiding the problem of collision with the towing vehicle during towing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a cross-sectional view of the present invention.

[0021] Figure 3 The present invention Figure 2 Enlarged view of point A.

[0022] Figure 4 The present invention Figure 2 Enlarged view of point B.

[0023] In the figure: 10, cylinder body; 11, cylinder front end cover; 12, cylinder barrel; 121, exhaust hole A; 13, cylinder rear end cover; 131, air inlet; 132, air inlet channel; 14, accommodating chamber; 141, front chamber; 142, rear chamber; 20, inner core rod; 21, fastener; 30, traction component; 31, connecting part; 32, flexible connecting part; 40, piston rod assembly; 41, piston rod; 411, center channel; 412, opening; 413, step part; 414, exhaust hole B; 42, piston; 421, first sealing member; 43, return spring; 44, linear bearing; 45, wear-resistant ring; 46, second sealing member; 50, connecting accessory; 60, clamping member; 61, first clamping block; 62, second clamping block; 63, bolt; 70, front end cover; 71, guide channel; 72, flange part. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1-4 As shown, a brake cylinder for trailer auxiliary use is fixedly installed in the towed vehicle when in use, and the brake pedal of the towed vehicle is clamped by a clamping component 60. The brake pedal of the towed vehicle is controlled by controlling the extension and retraction of the brake cylinder piston rod 41, thereby achieving the purpose of quickly braking the towed vehicle.

[0026] In order to facilitate understanding of the technical solution of the present invention, the front end in the present invention refers to the direction in which the piston rod 41 extends, and the rear end and the tail end refer to the direction in which the piston rod 41 contracts.

[0027] The brake cylinder of the present invention includes a cylinder body 10, an inner core rod 20, a piston rod assembly 40, a connecting accessory 50 and a clamping component 60. The cylinder body 10 is provided with a accommodating chamber 14, and the front end peripheral wall of the cylinder body 10 is provided with an exhaust hole A121. The tail of the cylinder body 10 is provided with an air inlet hole 131, and an air inlet joint is installed at the air inlet hole 131. The cylinder body 10 of the present invention includes a cylinder body front end cover 11, a cylinder barrel 12 and a cylinder body rear end cover 13. Sealing rings are respectively provided between the cylinder body front end cover 11 and the cylinder barrel 12 and between the cylinder body rear end cover 13 and the cylinder barrel 12. The air inlet hole 131 is arranged at the position of the cylinder body rear end cover 13.

[0028] The inner core rod 20 is fixedly installed in the cylinder body 10, and the front end of the inner core rod 20 is fixedly connected with a traction component 30. Furthermore, the traction component 30 includes a connecting portion 31 and a flexible connecting member 32. The flexible connecting member 32 is made of high-strength material. One end of the flexible connecting member 32 is fixedly connected to the inner core rod 20 through the connecting portion 31, and the other end of the flexible connecting member 32 is connected to the rear of the tractor. The flexible connecting member 32 can be made of high-strength soft steel wire or other high-strength soft connecting members. The front end of the high-strength soft steel wire is locked on the bottom armor of the trailer, thereby fixedly connected to the traction vehicle.

[0029] The piston rod assembly 40 includes a piston rod 41 and a piston 42 fixedly connected to the piston rod 41. In the present invention, the piston 42 is provided with an installation cavity for the piston rod 41 to partially extend into, the cavity wall of the installation cavity is provided with an internal thread, and the tail end of the piston rod 41 is threadedly connected to the installation cavity.

[0030] The piston rod 41 is provided with a central channel 411 with a front end opening 412, the inner core rod 20 is accommodated in the central channel 411, the traction component 30 is led out from the opening 412 of the central channel 411, the piston 42 is slidably arranged in the accommodating chamber 14, and a return spring 43 is abutted between the piston 42 and the front end of the cylinder body 10. The return spring 43 provides a guarantee for the return of the piston rod 41 and the brake pedal. The return spring 43 is sleeved on the outer periphery of the piston rod 41. In order to prevent the return spring 43 from being displaced, the present invention provides a guide groove on the piston 42 and / or the cylinder front end cover 70, and the return spring 43 is partially accommodated in the guide groove, and the return spring 43 is limited by the groove wall of the guide groove.

[0031] The piston 42 seals and separates the accommodating chamber 14 into a front chamber 141 and a rear chamber 142. Specifically, the piston 42 has an annular groove on its outer periphery, in which a second seal 46 is embedded. The accommodating chamber 14 is sealed and separated into a front chamber 141 and a rear chamber 142 by the second seal 46, wherein the front chamber 141 is connected to the exhaust hole A121, and the rear chamber 142 is connected to the intake hole 131. Furthermore, the piston 42 has an outer periphery provided with a wear-resistant ring 45, and the outer periphery of the wear-resistant ring 45 is slidably matched with the inner wall of the cylinder body 10. The provision of the wear-resistant ring 45 can reduce the friction force when the piston 42 slides, so that the wear of the piston 42 when sliding can be greatly reduced, thereby effectively improving the service life of the piston 42.

[0032] A first seal 421 is disposed between the piston 42 and the inner core rod 20 , and the first seal 421 is used to isolate the rear chamber 142 from the central channel 411 , and can also isolate the rear chamber 142 from the front chamber 141 . The first seal 421 is disposed at the tail end of the installation cavity corresponding to the piston 42 .

[0033] The connecting accessory 50 is fixedly connected to the output end of the piston rod 41. A clamping component 60 is provided on the connecting accessory 50. The clamping component 60 is used to clamp the brake pedal. Further, the clamping component 60 includes a first clamping block 61 and a second clamping block 62. The first clamping block 61 and the second clamping block 62 clamp the brake pedal through a bolt 63. Specifically, the first clamping block 61 is connected to the connecting accessory 50, and the second clamping block 62 is arranged at the upper end of the first clamping block 61. The first clamping block 61 and the second clamping block 62 are used to clamp the brake pedal of the towed vehicle. The first clamping block 61 and the second clamping block 62 are clamped by a bolt 63 group, so as to firmly clamp the brake pedal.

[0034] A front end cover 70 is fixedly installed at the opening 412 of the piston rod 41. The front end cover 70 is provided with a guide channel 71 whose opening is contracted radially backward. The traction component 30 is led out from the guide channel 71 to the outside. The front end cover 70 is made of brass. The setting of the front end is conducive to the extension and retraction of the flexible connector 32, so that the flexible connector 32 can be extended and retracted freely, thereby reducing the problem of sticking.

[0035] The front end of the piston rod 41 is provided with an external threaded portion and a step portion 413 provided at the rear end of the external threaded portion. The connecting accessory 50 is threadedly connected to the external threaded portion and abuts against the step portion 413, so that the connecting accessory 50 and the piston rod 41 are threadedly connected in one piece, which has higher strength.

[0036] Furthermore, the front end cover 70 is provided with a flange portion 72, and the connecting accessory 50 is clamped between the step portion 413 and the flange portion 72. This arrangement prevents the connecting accessory 50 from loosening and being screwed out of the external thread portion and detached from the piston rod 41 when the piston rod 41 is extended or retracted, thereby playing a protective role.

[0037] The front end peripheral wall of the piston rod 41 is provided with at least one exhaust hole B414. In the present invention, the exhaust holes B414 are provided with two groups and are circumferentially arranged on the piston rod 41. One end of the exhaust hole B414 is connected to the central channel 411, and the other end of the exhaust hole B414 passes through the piston rod 41. When the piston rod 41 is in the retracted position, the outer end of the exhaust hole B414 is blocked by the inner wall of the front end cover 11 of the cylinder body. The exhaust hole B414 has two functions. Function 1: when it is necessary to tighten the connecting accessory 50, by inserting a pin at the exhaust hole B414, it can assist in screwing the connecting accessory and the piston rod 41. Function 2: when the piston rod 41 is rapidly extended and retracted, the exhaust hole B414 can quickly discharge air, thereby preventing the cylinder from being suffocated and affecting operation.

[0038] An installation cavity is provided at the tail of the piston 42, and a linear bearing 44 is fixed in the installation cavity. The linear bearing 44 is sleeved on the outer periphery of the inner core rod 20, and the linear bearing 44 is arranged at the tail of the first seal 421. The linear bearing 44 is made of brass. The linear bearing 44 has two functions, thereby providing safe, stable and reliable braking performance: function one: supporting the inner core rod 20, function two: reducing the sliding friction between the piston 42 and the inner core rod 20, reducing the wear of the piston 42 and the inner core rod 20, thereby increasing the service life, and also providing safe, stable and reliable braking performance.

[0039] The tail of the inner core rod 20 is fixedly connected to the cylinder body 10 by a fastener 21. At least one air intake channel 132 is provided at the outer periphery of the tail of the cylinder body 10 corresponding to the inner core rod 20. The air intake channel 132 connects the air intake hole 131 and the rear chamber. In the present invention, four groups of air intake channels 132 are provided and are evenly arranged circumferentially on the rear end cover 13 of the cylinder body. In order to prevent the fastener 21 from loosening, the inner end of the air intake joint is abutted against the nut of the fastener 21.

[0040] The piston rod 41 is made of aluminum alloy, which serves the purpose of lightweight design. In addition, the first clamping block 61 and the second clamping block 62 are made of aluminum, which also serves the purpose of lightweight design.

[0041] When in use, the brake cylinder is fixedly installed in the towed vehicle, and the brake pedal of the towed vehicle is clamped by the clamping component 60. The front end of the towing component 30 is fixedly connected to the towing vehicle (for example, on the bottom armor of the trailer). At this time, when the towing vehicle is in emergency braking, the air intake hole 131 of the brake cylinder can be controlled to intake air, so that the piston rod 41 will drive the clamping component 60 and the brake pedal to press down, thereby achieving the purpose of rapid braking of the towed vehicle, thereby solving the problem of the towed vehicle colliding with the towing vehicle due to untimely braking. The rapid air intake of the brake cylinder can be controlled by a solenoid valve and a control module that controls the switching position of the solenoid valve, and the brake cylinder is supplied with air through an air pump.

[0042] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A trailer auxiliary brake cylinder, characterized in that: include A cylinder body (10) is provided with a containing cavity (14), a front end peripheral wall of the cylinder body (10) is provided with an exhaust hole A (121), and a rear end of the cylinder body (10) is provided with an air inlet hole (131); An inner core rod (20) is fixedly installed in the cylinder body (10), and a traction component (30) is fixedly connected to the front end of the inner core rod (20); The piston rod assembly (40) comprises a piston rod (41) and a piston (42) fixedly connected to the piston rod (41). The piston rod (41) is provided with a central channel (411) with a front end opening (412). The inner core rod (20) is accommodated in the central channel (411). The traction component (30) is led out from the opening (412) of the central channel (411). The piston (42) is slidably arranged in the accommodating chamber (14). The piston (42) is rotatably connected to the front end of the cylinder body (10). A return spring (43) is disposed between the piston (42), the piston (42) seals and separates the accommodating chamber (14) into a front chamber (141) and a rear chamber (142), the front chamber (141) is connected to the exhaust hole A (121), the rear chamber (142) is connected to the intake hole (131), a first sealing member (421) is disposed between the piston (42) and the inner core rod (20), and the rear chamber (142) and the central channel (411) are isolated by the first sealing member (421); The connecting accessory (50) is fixedly connected to the output end of the piston rod (41). The connecting accessory (50) is provided with a clamping component (60), and the clamping component (60) is used to clamp the brake pedal of the towed vehicle.

2. A trailer auxiliary brake cylinder according to claim 1, characterized in that: A front end cover (70) is fixedly mounted at the opening (412) of the piston rod (41). The front end cover (70) is provided with a guide channel (71) whose opening is contracted radially rearward. The traction component (30) is led out to the outside through the guide channel (71).

3. A trailer auxiliary brake cylinder according to claim 2, characterized in that: The front end of the piston rod (41) is provided with an external threaded portion and a step portion (413) arranged at the rear end of the external threaded portion, and the connecting accessory (50) is threadedly connected to the external threaded portion and abuts against the step portion (413).

4. The trailer auxiliary brake cylinder according to claim 3, characterized in that: The front end cover (70) is provided with a flange portion (72), and the connecting accessory (50) is clamped between the step portion (413) and the flange portion (72).

5. A trailer auxiliary brake cylinder according to any one of claims 1 to 4, characterized in that: At least one exhaust hole B (414) is provided on the peripheral wall at the front end of the piston rod (41), one end of the exhaust hole B (414) is connected to the central channel (411), and the other end of the exhaust hole B (414) passes through the piston rod (41). When the piston rod (41) is in the retracted position, the outer end of the exhaust hole B (414) is blocked by the inner wall of the front end cover (70) of the cylinder body (10).

6. The trailer auxiliary brake cylinder according to claim 1, characterized in that: The rear portion of the piston (42) is provided with a mounting cavity, a linear bearing (44) is fixed in the mounting cavity, and the linear bearing (44) is sleeved on the outer periphery of the inner core rod (20).

7. The trailer auxiliary brake cylinder according to claim 1, characterized in that: The tail of the inner core rod (20) is fixedly connected to the cylinder body (10) via a fastener (21); at least one air intake channel (132) is provided at the tail of the cylinder body (10) corresponding to the outer periphery of the inner core rod (20); the air intake channel (132) connects the air intake hole (131) and the rear chamber (142).

8. The trailer auxiliary brake cylinder according to claim 1, characterized in that: A wear-resistant ring (45) is provided on the outer periphery of the piston (42), and the outer periphery of the wear-resistant ring (45) is slidably matched with the inner wall of the cylinder body (10).

9. A trailer auxiliary brake cylinder according to any one of claims 1 to 4, characterized in that: The clamping component (60) comprises a first clamping block (61) and a second clamping block (62), and the first clamping block (61) and the second clamping block (62) clamp the brake pedal via a bolt (63).

10. A trailer auxiliary brake cylinder according to any one of claims 1 to 4, characterized in that: The traction component (30) comprises a connecting portion (31) and a flexible connecting piece (32). The flexible connecting piece (32) is made of a high-strength material. One end of the flexible connecting piece (32) is fixedly connected to the inner core rod (20) through the connecting portion (31), and the other end of the flexible connecting piece (32) is connected to the rear of the tractor.

Images