Stroke self-adaptive compensation brake oil cylinder

Abstract

The invention discloses a stroke self-adaptive compensation brake oil cylinder, and relates to the technical field of vehicle brake structures, the stroke self-adaptive compensation brake oil cylinder comprises an oil cylinder assembly and a piston assembly, the oil cylinder assembly comprises an oil cylinder seat and a fixing frame which are connected, and the piston assembly comprises an ejector rod, a piston mechanism, an elastic piece and a control mechanism; one end of the ejector rod is slidably clamped to the fixing frame, the other end of the ejector rod is in threaded connection with the piston mechanism, the piston mechanism is movably arranged in the oil cylinder base and connected with the control mechanism, the elastic piece is connected with the fixing frame and the piston mechanism and can release elastic force to drive the piston mechanism to slide towards the control mechanism so as to abut against the control mechanism, and the control mechanism drives the piston mechanism to rotate. The piston mechanism drives the ejector rod to move away from the piston mechanism through the threads, the ejector rod is closer to the brake pad compared with the prior art so as to play a role in stroke compensation, a driver does not need to prolong the stroke of the brake control structure, and braking rapidity and operation comfort are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle brake structures, and in particular to a stroke adaptive compensation brake oil cylinder. Background Art

[0002] At present, the brakes of some motor vehicles (especially commercial vehicles) are hub brakes. The positive pressure between the brake pad and the brake wheel is increased by the power source, and the friction between the two produces a braking effect, which stops the movement of the driven mechanism. Each braking will cause the brake pad to wear to varying degrees. When the brake is initially installed, the total stroke of the power source is equal to the working stroke of the brake and the reserved stroke for wearing and thinning the brake pad. Under normal circumstances, in order to ensure the rapidity of braking and the comfort of operation, the stroke of the brake cylinder will not be too large. When the reserved stroke of the brake cylinder adjustment drops to zero due to wear during use, the braking function of the brake will fail.

[0003] The existing solution is usually to replace the brake pads and then adjust the degree of relaxation of the brake control part to restore the original braking stroke. However, when the brake pads are worn to a certain extent, the braking stroke has to be increased to achieve the ideal braking effect, which will lead to a poor driving experience. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a stroke adaptive compensation brake cylinder to solve the technical problem in the prior art that the brake pads of the brake cannot be stroke compensated after wear, and the braking stroke needs to be increased to achieve an ideal braking effect with a poor driving experience.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a stroke adaptive compensation brake cylinder, comprising: The cylinder assembly includes a connected cylinder base and a fixing frame; and The piston assembly includes a push rod, a piston mechanism, an elastic member and a control mechanism. One end of the push rod is slidably engaged with the fixing frame. The piston mechanism is movably arranged inside the cylinder seat and one end of the piston mechanism is threadedly connected to the other end of the push rod and abuts against the fixing frame through the elastic member. The other end of the piston mechanism is connected to the control mechanism and can press against the control mechanism when the elastic member releases the elastic force, so that the control mechanism drives the piston mechanism to rotate synchronously. The piston mechanism drives the push rod to move away from the piston mechanism through the thread.

[0006] In some embodiments, the control mechanism includes an inner spiral sleeve and an outer spiral sleeve, the outer wall of the inner spiral sleeve is interference fit with the inner wall of the cylinder seat, and the inner wall of the inner spiral sleeve is spirally fit with the outer wall of the outer spiral sleeve. When the piston mechanism presses the outer spiral sleeve to move axially, the outer spiral sleeve can rotate relative to the inner spiral sleeve so that the outer spiral sleeve drives the piston mechanism to rotate.

[0007] In some embodiments, the piston mechanism includes a connected piston rod and an end toothed plate, wherein the end toothed plate is located between the piston rod and the outer spiral sleeve, and the side of the end toothed plate facing the outer spiral sleeve has a first tooth, and the side of the outer spiral sleeve facing the end toothed plate has a second tooth. When the piston rod moves to drive the end toothed plate toward the outer spiral sleeve, the end toothed plate can engage with the second tooth of the outer spiral sleeve through the first tooth.

[0008] In some embodiments, the piston mechanism further comprises a latch pin, which passes through the piston rod and the end toothed disc so as to keep the end toothed disc and the piston rod relatively fixed.

[0009] In some embodiments, the piston mechanism also includes a spring and a fixing cap, wherein the spring is sleeved on the piston rod and is located between the fixing cap and the outer spiral sleeve, and the fixing cap is threadedly connected to the piston rod and limits and pre-tightens the spring; when the piston rod slides toward the push rod, the piston rod can drive the spring to press against the outer spiral sleeve.

[0010] In some embodiments, the piston mechanism further comprises an oil seal sleeve, wherein the oil seal sleeve is sleeved on the piston rod, and an outer wall of the oil seal sleeve elastically abuts against an inner wall of the cylinder seat.

[0011] In some embodiments, the inner spiral sleeve is provided with a plurality of through oil holes along its circumference.

[0012] In some embodiments, the cylinder assembly also includes a cylinder cover and a sealing ring. The cylinder cover is connected to the cylinder seat by screws. A boss protrudes from one side of the cylinder cover. The sealing ring is sleeved on the boss. The boss is inserted into the inner wall of the cylinder seat. The sealing ring elastically abuts against the inner wall of the cylinder seat.

[0013] In some embodiments, the cylinder assembly further includes a dust cover, and the dust cover is sleeved on the end of the cylinder seat away from the cylinder cover.

[0014] In some embodiments, the fixing frame includes a first section and a second section that are perpendicular to each other, the first section is detachably connected to the cylinder seat by screws, and the second section is provided with a penetrating clamping hole, and the push rod is slidably clamped through the clamping hole.

[0015] Compared with the prior art, the stroke adaptive compensation brake cylinder provided by the present invention can be applied to motor vehicles and serve as a brake structure of motor vehicles. The cylinder seat can be used to connect the oil inlet pipe of the motor vehicle, and the push rod can be used to connect the brake pad of the motor vehicle. When the motor vehicle brakes, the driver can control the oil inlet pipe to fill the oil into the cylinder seat. The oil drives the piston mechanism to slide toward the elastic member through hydraulic pressure, and the piston mechanism drives the push rod to move. The push rod drives the brake pad to rub the wheel to achieve the braking effect. In this process, the elastic member is compressed by the piston mechanism to accumulate elastic force. When the oil inlet pipe stops feeding oil, the elastic member releases the elastic force to drive the piston mechanism to slide toward the control mechanism, and the piston mechanism presses the control mechanism so that the control mechanism drives the piston mechanism to rotate. The piston mechanism drives the push rod to move away from the piston mechanism through the thread. The push rod is closer to the brake pad than before, so as to play a role in stroke compensation. The driver does not need to extend the stroke of the brake control structure, ensuring the rapidity of braking and the comfort of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a stroke adaptive compensation brake cylinder provided by an embodiment of the present invention; Figure 2 is a cross-sectional schematic diagram of a stroke adaptive compensation brake cylinder provided by an embodiment of the present invention; Figure 3 It is a disassembled schematic diagram of a stroke adaptive compensation brake cylinder provided by an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the end toothed disc provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] In order to solve the technical problem in the prior art that the brake pads of motor vehicles cannot obtain stroke compensation after wear, the driver needs to increase the braking stroke and achieve an ideal braking effect with a poor driving experience, resulting in a poor driving experience, the present invention provides a stroke adaptive compensation brake cylinder, which can achieve timely stroke compensation for the brake pads of the brakes after wear, and the driver can achieve an ideal braking effect without increasing the braking stroke, thereby providing a good driving experience.

[0019] It should be noted that the stroke adaptive compensating brake cylinder described in the present invention is used for but not limited to motor vehicles, etc. For the convenience of explanation, in the present invention, only the application of the stroke adaptive compensating brake cylinder to a motor vehicle is used as an example for explanation, and the principle of applying the stroke adaptive compensating brake cylinder to other types of equipment is essentially the same as that applied to motor vehicles, and will not be repeated here.

[0020] See also Figure 1 , Figure 1 The schematic diagram of the structure of the stroke adaptive compensation brake cylinder in one embodiment of the present invention is shown. The stroke adaptive compensation brake cylinder includes a cylinder assembly and a piston assembly. The cylinder assembly includes a cylinder seat 1 and a fixed frame 2 connected to each other. The cylinder seat 1 has an active cavity inside, which is used to accommodate the piston assembly and allow the piston assembly to slide back and forth. One end of the fixed frame 2 is detachably connected to the cylinder seat 1 by screws. The piston assembly includes a push rod 3, a piston mechanism 4, an elastic member 5 and a control mechanism 6. One end of the push rod 3 is slidably engaged with the fixed frame 2 and the other end is threadedly connected to the piston mechanism 4. The control mechanism 6 is located in the active cavity. The piston mechanism 4 is movably arranged in the active cavity of the cylinder seat 1 and connected to the control mechanism 6. The elastic member 5 is connected to the fixed frame 2 and the piston mechanism 4. When the piston mechanism 4 moves toward the elastic member 5, the piston mechanism 4 can press against the elastic member 5 to accumulate elastic force. The elastic member 5 can also release elastic force to drive the piston mechanism 4 to slide toward the control mechanism 6 to press the control mechanism 6, so that the control mechanism 6 drives the piston mechanism 4 to rotate. Since the piston mechanism 4 is threadedly connected to the push rod 3, the piston mechanism 4 can drive the push rod 3 to move away from the piston mechanism 4 through the thread when rotating, so as to achieve the effect of compensatory braking.

[0021] The end of the push rod 3 in this embodiment away from the piston mechanism 4 can be used to connect the brake pad of the motor vehicle brake, and the brake pad rubs against the wheel to brake the wheel. When the brake pad is worn, the control mechanism 6 drives the piston mechanism 4 and the push rod 3 to rotate relative to each other, and drives the push rod 3 to move away from the piston mechanism 4 through the thread, so as to achieve the effect of stroke compensation.

[0022] In one embodiment, see Figure 2 and Figure 3The control mechanism 6 includes an inner spiral sleeve 61 and an outer spiral sleeve 62. The outer wall of the inner spiral sleeve 61 is interference fit with the inner wall of the cylinder seat 1, so that the inner spiral sleeve 61 and the inner wall of the cylinder seat 1 are kept tightly connected, and the inner spiral sleeve 61 will not move relative to the cylinder seat 1. The inner wall of the inner spiral sleeve 61 is spirally fitted with the outer wall of the outer spiral sleeve 62. When the outer spiral sleeve 62 is subjected to an axial external force and moves, the outer spiral sleeve 62 can rotate relative to the inner spiral sleeve 61. When the piston mechanism 4 presses against the outer spiral sleeve 62 to move axially, the outer spiral sleeve 62 can rotate relative to the inner spiral sleeve 61, so that the outer spiral sleeve 62 drives the piston mechanism 4 to rotate. When the piston mechanism 4 rotates, it can drive the push rod 3 to move away from the piston mechanism 4 through the thread.

[0023] In one embodiment, see Figure 2 and Figure 3 The piston mechanism 4 includes a piston rod 41 and an end gear plate 42 , one end of the piston rod 41 is connected to the end gear plate 42 , and the other end of the piston rod 41 is threadedly connected to the push rod 3 . The end toothed disc 42 is located between the piston rod 41 and the outer spiral sleeve 62. The side of the end toothed disc 42 facing the outer spiral sleeve 62 has a first latching tooth 421, and the side of the outer spiral sleeve 62 facing the end toothed disc has a second latching tooth 621. When the piston rod 41 moves to drive the end toothed disc 42 toward the outer spiral sleeve 62, the end toothed disc 42 can engage with the second latching tooth 621 of the outer spiral sleeve 62 through the first latching tooth 421. At this time, the end toothed disc 42 presses against the outer spiral sleeve 62, driving the outer spiral sleeve 62 to rotate relative to the inner spiral sleeve 61. Since the outer spiral sleeve 62 and the end toothed disc 42 engage with the first latching tooth 421 and the second latching tooth 621, the outer spiral sleeve 62 can drive the end toothed disc 42 to rotate when it rotates, and the end toothed disc 42 drives the piston rod 41 to rotate, and the piston rod 41 drives the push rod 3 to move through the thread to compensate for the braking stroke.

[0024] In one embodiment, see Figure 3 and Figure 4 The piston mechanism 4 also includes a latch 43, which penetrates the piston rod 41 and the end toothed disc 42 so that the end toothed disc 42 and the piston rod 41 remain relatively fixed. In this embodiment, the latch 43 can not only stably connect the end toothed disc 42 and the piston rod 41 so that the end toothed disc 42 and the piston rod 41 can rotate synchronously, but also facilitate the disassembly of the end toothed disc 42 and the piston rod 41. Specifically, the piston rod 41 has a protrusion 411, and the protrusion 411 is provided with a through hole 412, and the end toothed disc 42 is annular and is sleeved on the protrusion 411, so that the hole of the end toothed disc 42 and the through hole 412, and then the latch 42 is used to penetrate two holes.

[0025] In one embodiment, see Figure 2 and Figure 3The piston mechanism 4 further includes a spring 44, a fixing cap 45 and a fixing screw 46. The spring 44 is sleeved on the protruding portion 411 of the piston rod 41. The spring 44 is located between the fixing cap 45 and the outer spiral sleeve 62. The outer spiral sleeve 62 is sleeved on the protruding portion 411. The fixing screw 46 penetrates the fixing cap 45 and the spring 44 and is threadedly connected to the protruding portion 411 to limit and pre-tighten the spring 44. When the piston rod 41 slides toward the push rod 3, the piston rod 41 can drive the spring 44 to press against the outer spiral sleeve 62. Since the pre-compression force on the spring 44 is smaller than the minimum axial force required for the outer spiral sleeve 62 to rotate, the outer spiral sleeve 62 is stationary at this time, the spring 44 is further compressed, and the first latch tooth 421 is disengaged from the second latch tooth 621; when the sliding amount of the piston rod 41 further increases, the compression force of the spring 44 and the axial force on the outer spiral sleeve 62 also increase, causing the outer spiral sleeve 62 to rotate, and the second latch tooth 621 is circumferentially displaced relative to the first latch tooth 421.

[0026] In one embodiment, see Figure 2 and Figure 3 The piston mechanism 4 further includes an oil seal sleeve 47, which is sleeved on the piston rod 41, and the outer wall of the oil seal sleeve 47 elastically abuts against the inner wall of the cylinder seat 1. The oil seal sleeve 47 of this embodiment forms a driving space with the tail of the cylinder seat 1, and the driving space is used for oil intake, and the oil hydraulic pressure acts on the oil seal sleeve 47 to drive the entire piston mechanism 4 to move toward the push rod 3. The inner spiral sleeve 61 is provided with a plurality of penetrating oil inlet holes 611 along its circumference, so that the oil liquid input from the tail of the cylinder seat 1 can act on the oil seal sleeve 47 through the oil inlet holes 611. In addition, the oil seal sleeve 47 can prevent the oil liquid from entering the part to the left of the oil seal sleeve 47.

[0027] In one embodiment, see Figure 2 and Figure 3 The oil cylinder assembly also includes a cylinder head 11 and a sealing ring 12. The cylinder head 11 is connected to the oil cylinder seat 1 by screws 13. A boss 14 is protruded on one side of the cylinder head 11. The sealing ring 12 is sleeved on the boss 14. The boss 14 is inserted into the inner wall of the oil cylinder seat 1. The sealing ring 12 elastically abuts against the inner wall of the oil cylinder seat 1 to improve the sealing performance of the oil cylinder seat 1 and prevent oil from leaking out. The cylinder head 11 of this embodiment is connected to the oil cylinder seat 1 by multiple screws 13, which is convenient for the subsequent disassembly and assembly of the cylinder head 11 and the replacement of the parts inside the oil cylinder seat 1. A connecting hole 16 is provided at the center of the cylinder head 11. The connecting hole 16 is used to thread the oil inlet pipe of the motor vehicle. The oil inlet pipe is connected to the oil tank of the motor vehicle. When the motor vehicle issues a braking command, the oil in the oil tank enters the connecting hole 16 through the oil inlet pipe, and then enters the interior of the oil cylinder seat 1, driving the piston mechanism 4 to move toward the push rod 3, so that the push rod 3 pushes the brake pad to brake the wheel.

[0028] In one embodiment, see Figure 1 and Figure 3 The oil cylinder assembly further comprises a dust cover 15 , which is sleeved on the end of the oil cylinder seat 1 away from the cylinder cover 11 to prevent dust from entering the interior of the oil cylinder seat 1 .

[0029] In one embodiment, see Figure 3 The fixing frame 2 includes a first section 21 and a second section 22 which are perpendicular to each other. The first section 21 is detachably connected to the oil cylinder seat 1 by means of screws 23. The second section 22 is provided with a through-hole, and the ejector rod 3 is slidably engaged with the through-hole. The fixing frame 2 of this embodiment is detachably mounted on the oil cylinder seat 1 by means of screws 23, so as to facilitate replacement of the fixing frame 2. For ejector rods 3 of different strokes, the fixing frame 2 with different distances between the first section 21 and the second section 22 can be replaced to ensure that the through-hole of the fixing frame 2 is stably slidably engaged with the ejector rod 3.

[0030] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the present invention is described in detail: The stroke adaptive compensating brake oil cylinder provided by the present invention can be applied to motor vehicles and serve as a part of the brake system of the motor vehicle. Among them, the cylinder head 11 of the stroke adaptive compensating brake oil cylinder is threadedly connected to the oil tank of the motor vehicle, and the push rod 3 is used to connect the brake pad. When the motor vehicle needs to brake, the driver can issue a braking command to control the oil liquid in the oil tank to enter the interior of the cylinder seat 1 through the connecting hole 15 of the cylinder head 11, and the oil liquid acts on the oil seal sleeve 47 through the oil inlet hole 611 of the inner spiral sleeve 61, driving the entire piston mechanism 4 to slide toward the push rod 3, and the piston mechanism 4 drives the push rod 3 and the brake pad to brake the motor vehicle. In this process, the piston rod 41 drives the fixing cap 45 to compress the spring 44 to accumulate elastic force, and the spring 44 presses the outer spiral sleeve 62 through the elastic force, causing the first latch 421 to disengage from the second latch 621. If the sliding amount of the piston mechanism 4 continues to increase, the rotation of the outer spiral sleeve 62 causes the second latch 621 to be circumferentially dislocated relative to the first latch 421. The larger the sliding amount of the piston rod, the larger the dislocation angle. The elastic member 5 is compressed by the piston rod 41 and accumulates elastic force. When the driver stops braking, the oil seal 47 loses the force of the oil liquid, and the elastic member 5 releases the elastic force to drive the piston rod 41 to slide toward the cylinder head 11. The piston rod 41 drives the end toothed disc 42 to re-engage with the outer spiral sleeve 62, and applies thrust to the outer spiral sleeve 62, driving the outer spiral sleeve 62 to press against the inner spiral sleeve 61. The outer spiral sleeve 62 rotates relative to the inner spiral sleeve 61, and the outer spiral sleeve 62 drives the end toothed disc 42 to rotate, and the end toothed disc 42 drives the piston rod 41 to rotate. The piston rod 41 drives the push rod 3 to move away from the piston rod 41 through the thread, so that the push rod drives the brake pad to move to compensate for the braking stroke.

[0031] If the brake pad becomes thinner due to wear, the driver needs to control more oil to enter the cylinder seat 1, drive the piston rod 41 to move a longer distance toward the push rod 3, and the misalignment angle between the second latching tooth 621 and the first latching tooth 421 is larger. When the piston rod 41 slides in the return stroke, it first drives the first latching tooth 421 of the end gear plate 42 to re-engage with the second latching tooth 621 of the outer spiral sleeve 62. The rotation of the outer spiral sleeve 62 drives the piston rod 41 to rotate a larger angle. The piston rod 41 drives the push rod 3 to move a longer distance through the thread, so as to fully compensate for the braking stroke.

[0032] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A stroke adaptive compensation brake cylinder, characterized in that: include: The oil cylinder assembly comprises an oil cylinder seat and a fixing frame connected thereto; and The piston assembly includes a push rod, a piston mechanism, an elastic member and a control mechanism. One end of the push rod is slidably engaged with the fixing frame. The piston mechanism is movably arranged inside the cylinder seat and one end of the piston mechanism is threadedly connected to the other end of the push rod and abuts against the fixing frame through the elastic member. The other end of the piston mechanism is connected to the control mechanism and can press against the control mechanism when the elastic member releases the elastic force, so that the control mechanism drives the piston mechanism to rotate synchronously. The piston mechanism drives the push rod to move away from the piston mechanism through the thread.

2. The stroke adaptive compensation brake cylinder according to claim 1, characterized in that: The control mechanism includes an inner spiral sleeve and an outer spiral sleeve. The outer wall of the inner spiral sleeve is interference fit with the inner wall of the cylinder seat, and the inner wall of the inner spiral sleeve is spirally fit with the outer wall of the outer spiral sleeve. When the piston mechanism presses the outer spiral sleeve to move axially, the outer spiral sleeve can rotate relative to the inner spiral sleeve so that the outer spiral sleeve drives the piston mechanism to rotate.

3. The stroke adaptive compensation brake cylinder according to claim 2, characterized in that: The piston mechanism includes a connected piston rod and an end toothed disc, wherein the end toothed disc is located between the piston rod and the outer spiral sleeve, and the end toothed disc has a first latching tooth on a side facing the outer spiral sleeve, and the outer spiral sleeve has a second latching tooth on a side facing the end toothed disc. When the piston rod moves to drive the end toothed disc toward the outer spiral sleeve, the end toothed disc can engage with the second latching tooth of the outer spiral sleeve through the first latching tooth.

4. The stroke adaptive compensation brake cylinder according to claim 3, characterized in that: The piston mechanism also includes a latch pin, which passes through the piston rod and the end toothed disc so that the end toothed disc and the piston rod remain relatively fixed.

5. The stroke adaptive compensation brake cylinder according to claim 3, characterized in that: The piston mechanism also includes a spring and a fixing cap. The spring is sleeved on the piston rod and is located between the fixing cap and the outer spiral sleeve. The fixing cap is threadedly connected to the piston rod and limits and pre-tightens the spring. When the piston rod slides toward the push rod, the piston rod can drive the spring to press against the outer spiral sleeve.

6. The stroke adaptive compensation brake cylinder according to claim 3, characterized in that: The piston mechanism further comprises an oil seal sleeve, which is sleeved on the piston rod, and the outer wall of the oil seal sleeve elastically abuts against the inner wall of the cylinder seat.

7. The stroke adaptive compensation brake cylinder according to claim 2, characterized in that: The inner spiral sleeve is provided with a plurality of penetrating oil holes along its circumference.

8. The stroke adaptive compensation brake cylinder according to claim 1, characterized in that: The cylinder assembly also includes a cylinder cover and a sealing ring. The cylinder cover is connected to the cylinder seat by screws. A boss is protruded from one side of the cylinder cover. The sealing ring is sleeved on the boss. The boss is inserted into the inner wall of the cylinder seat. The sealing ring elastically abuts against the inner wall of the cylinder seat.

9. The stroke adaptive compensation brake cylinder according to claim 8, characterized in that: The oil cylinder assembly further comprises a dust cover, and the dust cover is sleeved on the end of the oil cylinder seat away from the cylinder cover.

10. The stroke adaptive compensation brake cylinder according to claim 1, characterized in that: The fixing frame comprises a first section and a second section which are perpendicular to each other. The first section is detachably connected to the oil cylinder seat by means of screws. The second section is provided with a through-hole through which the ejector rod is slidably engaged.

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