CN213981739U - Bidirectional self-boosting drum brake with impact type bidirectional lever self-adjusting mechanism - Google Patents
Bidirectional self-boosting drum brake with impact type bidirectional lever self-adjusting mechanism Download PDFInfo
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- CN213981739U CN213981739U CN202021971118.6U CN202021971118U CN213981739U CN 213981739 U CN213981739 U CN 213981739U CN 202021971118 U CN202021971118 U CN 202021971118U CN 213981739 U CN213981739 U CN 213981739U
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Abstract
The utility model discloses a take striking two-way lever self-modulation mechanism's two-way self-reinforcement formula drum brake. The brake device comprises a brake bottom plate assembly, a brake drum, a front shoe assembly, a rear wheel cylinder assembly and a bidirectional lever self-adjusting mechanism device, wherein the rear wheel cylinder assembly is arranged on the brake bottom plate assembly; the bidirectional lever self-adjusting mechanism device comprises a central sleeve, a gap adjuster base, a gap adjusting plate mechanism, a pressure spring assembly and a ratchet wheel rotation gap adjusting assembly. The utility model discloses can automatic two-way adjustment hoof drum clearance, can real-time accurate adjustment hoof drum clearance, and avoided manual or one-way regulation clearance inconvenient and inaccurate nature.
Description
Technical Field
The utility model relates to a hydraulic pressure touches has the self-energizing formula drum brake of adjusting gap mechanism assembly, has especially related to a two-way self-energizing formula drum brake with striking two-way lever self-modulation mechanism device.
Background
The hydraulic self-boosting drum brake is mainly used on engineering vehicles and trailers with large loads and slow speeds, and effective and stable braking is required.
The self-boosting drum brake has high braking efficiency which is 2 times of the braking efficiency of the common leading shoe drum brake, so that the self-boosting drum brake is more seriously worn than other types of drum brakes under the same working condition; when the amount of wear is too great and the wear gap between the brake drum and the friction lining is not compensated, this can result in:
firstly, the idle stroke is too large: the amplitude of the foot brake stroke is increased when the brake is directly applied;
secondly, the braking time is long: the direct result of too large braking stroke is that the time required for braking to the same speed is long, and the effect of short-time and short-distance braking can not be achieved particularly during emergency braking;
thirdly, the required liquid amount is increased: when the brake is carried out, the friction plate is in contact with the brake drum and even extruded, the brake can be realized, when the gap between the brake drum and the friction plate is too large, the piston stroke in the brake wheel cylinder assembly is increased, and the required hydraulic oil is increased;
at present, self-boosting drum brakes installed on automobiles in the market adopt a method for manually adjusting the clearance between a brake drum and a friction plate, and the method for manually adjusting the clearance between the brake drum and the friction plate has more defects:
firstly, difficulty in adjustment: the brake is arranged on an automobile, and when the gap between the hoof drum and the automobile is required to be adjusted, a driver or a worker is required to lean to the bottom of the automobile or lift the automobile, and a tool is detected in a bottom plate hole in the tire to stir a gear of the gap adjusting ratchet assembly, so that the brake is inconvenient;
secondly, the adjustment amplitude is not well controlled: when the gear of transferring the clearance ratchet assembly is stirred manually, what of adjusting the chi number is not controlled well, and the hoof drum clearance that directly can reflect after transferring differs in size: the hoof and drum clearance is too large, the adjusting effect cannot be achieved, the effective acting time is short, and the adjusting times are increased; the gap between the hoof drums is too small, so that dragging and grinding are easily generated between the hoof drums, the use performance is influenced, and the service lives of the hoofs and the drums are shortened;
thirdly, the regulation period cannot be determined: the period of manually adjusting the self-boosting drum brake is generally determined by a driver master through own experience, and if the road condition of the whole automobile running period is stable, the maintenance period is approximately the same; however, the same road condition of the automobile is not always maintained in the driving process, various accidents or changes always occur, meanwhile, the abrasion conditions of the brake shoe and the brake drum are different, the maintenance period is not necessarily required, and therefore the brake is easily braked by a brake with heavy abrasion or is not abraded to the abrasion degree of the maintenance, and the maintenance cost is increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of difficult clearance of the manual adjustment or one-way self-adjusting brake in the prior art, the utility model aims to provide a two-way self-reinforcement type drum brake with an impact type two-way lever self-adjusting mechanism, which can timely and accurately adjust the clearance between the shoe drums on two sides in the use process of the self-reinforcement type drum brake.
In order to achieve the above purpose, the technical scheme of the utility model is that:
the utility model comprises a brake bottom plate assembly, a brake drum, a front shoe assembly, a rear shoe assembly and a rear wheel cylinder assembly, wherein the brake bottom plate assembly is arranged on a frame; the brake shoe mechanism comprises a brake base plate assembly, a front shoe assembly, a rear shoe assembly, a two-way lever self-adjusting mechanism device and a front shoe assembly, wherein the front shoe assembly and the rear shoe assembly are arranged on two sides of the brake base plate assembly through respective pressure spring mechanisms, the upper ends of the front shoe assembly and the rear shoe assembly are elastically connected to a shoe supporting pin on the upper part of the brake base plate assembly through respective upper end return springs on two sides, a lower end return spring and the two-way lever self-adjusting mechanism device are connected between the lower ends of the front shoe assembly and the rear shoe assembly, and the front shoe assembly and the rear shoe assembly are elastically connected to the two-way lever self-adjusting mechanism device through the lower end return spring to perform gap self-adjustment.
The bidirectional lever self-adjusting mechanism device comprises a central sleeve, a gap adjuster base, a gap adjuster mechanism, a pressure spring assembly and a ratchet wheel rotation gap adjuster assembly, wherein the gap adjuster base is U-shaped, coaxial through holes are formed in two ends of the U-shaped base, the central sleeve is sleeved in the through holes in the two ends of the U-shaped base in a penetrating mode, the pressure spring assembly used for elastic gap adjustment is sleeved on the central sleeve, the ratchet wheel rotation gap adjuster assemblies which are identical in structure and coaxially installed are arranged at two ends of the central sleeve, and the ratchet wheel rotation gap adjuster assemblies at the two ends are respectively connected with a leading shoe and a trailing shoe through respective gap adjusting screw rods; the top end of the gap adjuster base is provided with a gap adjusting plate mechanism, the gap adjusting plate mechanism is connected with the ratchet rotating gap adjusting assembly, and the gap adjusting plate mechanism lever is used for shifting the rotation and axial movement of the ratchet rotating gap adjusting assembly to drive the change of the axial distance between the gap adjusting screw rods at the two ends to realize the self-gap adjustment.
The upper part of the brake bottom plate assembly is provided with a supporting pin, the upper ends of the front shoe assembly and the rear shoe assembly are respectively and elastically connected onto the supporting pin on the upper part of the brake bottom plate assembly through upper end return springs, the upper end return springs are respectively hooked with the upper ends of the front shoe assembly, the rear shoe assembly and the supporting pin, and the lower end return springs are respectively hooked with the lower ends of the front shoe assembly and the rear shoe assembly.
The front shoe assembly and the rear shoe assembly comprise shoe ribs, brake shoe friction plates and shoe plates; the shoe plates are vertically and fixedly connected to the circumferential surface of the inner side of the tendon, and the brake shoe friction plates are fixedly attached to the circumferential surface of the outer side of the tendon; the middle parts of the tendons of the front shoe assembly and the rear shoe assembly are connected to the brake bottom plate assembly through pressure spring mechanisms, the upper ends of the tendons of the front shoe assembly and the rear shoe assembly are connected to a stepped shaft of a shoe supporting pin in a leaning mode, and the lower ends of the tendons of the front shoe assembly and the rear shoe assembly are connected through gap adjusting screws in a lever self-adjusting mechanism device.
The rear wheel cylinder assembly comprises a brake wheel cylinder and pistons sleeved at two ends of a cylinder hole in the brake wheel cylinder, the brake wheel cylinder is fixed on the end face of the brake bottom plate assembly through a hexagon bolt and a spring washer, and the pistons at two ends are respectively abutted against the tendon of the front shoe assembly and the tendon edge of the rear shoe assembly.
The pressure spring mechanism comprises a pressure spring pull rod, a pressure spring seat and a pressure spring, one end of the pressure spring pull rod is connected to the brake bottom plate assembly, the other end of the pressure spring pull rod penetrates through a shoe tendon of the front shoe assembly or a shoe tendon of the rear shoe assembly to be connected with the pressure spring seat, and the pressure spring is sleeved on the pressure spring pull rod between the pressure spring seat and the shoe tendon of the front shoe assembly or the shoe tendon of the rear shoe assembly.
The connecting end surfaces of the two end gap adjusting screw rods are provided with open grooves, and the tendon of the front hoof assembly and the tendon of the rear hoof assembly are respectively embedded into the open grooves of the gap adjusting screw rods.
The pressure spring assembly comprises a gap adjusting pressure spring and clamping pads located at two ends of the gap adjusting pressure spring, an annular groove is formed in the outer peripheral surface of the central sleeve, the gap adjusting pressure spring and the clamping pads are sleeved in the annular groove of the central sleeve, the inner ring of each clamping pad abuts against the side wall of the groove of the annular groove of the central sleeve, and the outer ring of each clamping pad abuts against the end face of the through hole of the gap adjuster base.
The ratchet wheel rotation gap adjusting assembly comprises a nut sleeve, a ratchet wheel fluted disc and a gap adjusting gasket, wherein the nut sleeve is of a stepped shaft structure with a large diameter at the middle end and small diameters at the inner end and the outer end; the inner end of the nut sleeve is movably sleeved in the central through hole of the central sleeve, and a gap adjusting gasket is arranged between a middle end shaft shoulder close to the inner end of the nut sleeve and the hole end face of the central through hole of the central sleeve; the outer end of the nut sleeve is fixedly sleeved with a ratchet fluted disc, the end face of the outer end of the nut sleeve is provided with a threaded central hole, and the clearance adjusting screw rod is sleeved in the threaded central hole through threads.
The gap adjusting plate mechanism comprises a gap adjusting plate horizontally arranged above a gap adjuster base, two gap adjusting plate pins and two gap adjusting tension springs, wherein the two gap adjusting plate pins and the two gap adjusting tension springs are arranged on the gap adjusting plate in a centrosymmetric mode, the gap adjusting plate is of a centrosymmetric structure, strip-shaped grooves are formed in the two sides of the gap adjusting plate in centrosymmetric mode, each strip-shaped groove is provided with a gap adjusting plate pin, the gap adjusting plate pins penetrate through the strip-shaped grooves and are vertically and fixedly inserted into holes in the top end face of the gap adjuster base, and the outer sides of the two strip-shaped grooves are connected with the gap adjuster base through the respective gap adjusting tension springs so that the gap adjusting plate rotates around the middle point between the two gap adjusting plate pins under the elastic tension force of the gap adjusting tension springs.
The edge of each of two ends of the gap adjusting plate is provided with a shifting gear plate protruding towards the ratchet wheel rotation gap adjusting assembly, the shifting gear plate is connected with the ratchet wheel rotation gap adjusting assembly, and the edge of the gap adjusting plate near the shifting gear plate is provided with a salient point connected with the ratchet wheel rotation gap adjusting assembly.
And the gap adjusting plate pin is inserted into the part in the opening of the gap adjuster base and then axially fixed through a hollow locking pin horizontally and radially arranged on the gap adjuster base.
The utility model has the advantages that:
the utility model discloses can realize the timely regulation in hoof-drum clearance, compensate regulation difficulty, the regulation range that manual or one-way self-modulation clearance adjustment brought and not good the unable definite defect of accuse, regulation cycle.
The utility model discloses an accurate regulation in hoof-drum clearance, the number of teeth of the gear of transferring the clearance ratchet among the transfer clearance ratchet assembly can change, according to the requirement in concrete clearance in the car use and the structure of stopper, through calculating and experimental definite number of teeth of the gear that can be accurate, when the hoof-drum clearance surpasss the requirement scope, it can stir the gear rotation to dial the board, and then reaches the purpose that the accurate hoof-drum clearance was maintained.
The utility model discloses for present manual adjustment or one-way self-modulation clearance, can automatic two-way adjustment hoof drum clearance, the real-time accurate adjustment hoof drum clearance of ability, and avoided on the whole car with the inconvenient nature and the inaccuracy in clearance mechanism adjustment hoof drum clearance are adjusted to the instrument.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a three-dimensional schematic diagram of the present invention.
Fig. 3 is a three-dimensional schematic view of the leading shoe assembly and the trailing shoe assembly.
Fig. 4 is a three-dimensional schematic view of the rear wheel cylinder assembly.
Fig. 5 is a sectional view taken along the line a-a of fig. 1.
FIG. 6 is a three-dimensional schematic view of a brake spider assembly.
Fig. 7 is a front cross-sectional view of a bi-directional lever self-aligning mechanism.
Fig. 8 is a front view of a bi-directional lever self-aligning mechanism.
Fig. 9 is a top view of a bi-directional lever self-aligning mechanism.
Fig. 10 is an exploded view of a bi-directional lever self-aligning mechanism.
In the figure: 1. the brake device comprises a front shoe assembly, a rear wheel cylinder assembly, a front wheel cylinder assembly, a rear wheel cylinder assembly, a rear wheel cylinder, a; 17. A support pin; 18. the brake shoe comprises a brake shoe friction plate 19, a shoe rib 20, a shoe plate 22, a hollow locking pin 23, a gap adjusting pressure spring 24, a gap adjusting plate pin 25, a gap adjusting gasket 26, a nut sleeve 27, a center sleeve 28, a gap adjusting tension spring 29, a gap adjusting screw rod 30, a gap adjusting plate 31, a ratchet fluted disc 32, a clamping pad 33, a gap adjuster base 34, a tooth shifting plate 35 and salient points.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the utility model comprises a brake bottom plate assembly 11, a brake drum 16, a front shoe assembly 1, a rear shoe assembly 2 and a rear wheel cylinder assembly 3, wherein the brake bottom plate assembly 11 is installed on a vehicle frame, the utility model also comprises a bidirectional lever self-adjusting mechanism device 8, the rear wheel cylinder assembly 3 is fixedly installed in the middle of the end surface of the brake bottom plate assembly 11, the front shoe assembly 1 and the rear shoe assembly 2 are both installed on both sides of the brake bottom plate assembly 11 through respective pressure spring mechanisms, the upper ends of the front shoe assembly 1 and the rear shoe assembly 2 are both elastically connected to a shoe supporting pin on the upper part of the brake bottom plate assembly 11 through respective upper end return springs 4 on both sides, a lower end return spring 12 and a bidirectional lever self-adjusting mechanism device 8 are connected between the lower ends of the front shoe assembly 1 and the rear shoe assembly 2, the front shoe assembly 1 and the rear shoe assembly 2 are elastically connected to the bidirectional lever self-adjusting mechanism device 8 through a lower end return spring 12 to perform impact type gap self-adjustment; the lower ends of the front hoof assembly 1 and the rear hoof assembly 2 are elastically connected through a lower end return spring 12 in a pulling mode, and the gap is adjusted through connection of a bidirectional lever self-adjusting mechanism device 8.
As shown in fig. 7-10, the two-way lever self-adjusting mechanism device 8 includes a central sleeve 27, a gap adjuster base 33, a gap adjuster mechanism, a pressure spring assembly and a ratchet rotation gap adjuster assembly, the gap adjuster base 33 is U-shaped, coaxial through holes are opened at two ends of the U-shape, the central sleeve 27 is sleeved in the through holes at two ends of the U-shape in a penetrating manner, the central sleeve 27 is sleeved with the pressure spring assembly for elastic gap adjustment, the ratchet rotation gap adjuster assemblies with the same structure and coaxial installation are installed at two ends of the central sleeve 27, and the ratchet rotation gap adjuster assemblies at two ends are respectively connected with a leading shoe and a trailing shoe through respective gap adjusting screws 29; the top end of the gap adjuster base 33 is provided with a gap adjusting plate mechanism, the gap adjusting plate mechanism is connected with the ratchet wheel rotating gap adjusting assembly, and the gap adjusting plate mechanism lever is used for shifting the rotation and axial movement of the ratchet wheel rotating gap adjusting assembly to drive the change of the axial distance between the gap adjusting screw rods 29 at the two ends to realize the self-gap adjustment.
The pressure spring assembly comprises a gap adjusting pressure spring 23 and clamping pads 32 located at two ends of the gap adjusting pressure spring 23, an annular groove is formed in the outer peripheral surface of the central sleeve 27, the gap adjusting pressure spring 23 and the clamping pads 32 are sleeved in the annular groove of the central sleeve 27, the inner ring of each clamping pad 32 abuts against the side wall (namely a shaft shoulder) of the annular groove of the central sleeve 27, and the outer ring of each clamping pad 32 abuts against the end face of a through hole of the gap adjuster base 33.
The ratchet rotation gap adjusting assembly comprises a nut sleeve 26, a ratchet fluted disc 31 and a gap adjusting gasket 25, wherein the nut sleeve 26 is of a stepped shaft structure with a large diameter at the middle end and small diameters at the inner end and the outer end; the inner end of the nut sleeve 26 is movably sleeved in the central through hole of the central sleeve 27, and a gap adjusting gasket 25 is arranged between a middle end shaft shoulder of the nut sleeve 26 close to the inner end and the hole end face of the central through hole of the central sleeve 27; the outer end of the nut sleeve 26 is fixedly sleeved with a ratchet fluted disc 31, the end face of the outer end of the nut sleeve 26 is provided with a threaded central hole, and the clearance adjusting screw 29 is sleeved in the threaded central hole through threads.
The gap adjusting plate mechanism comprises a gap adjusting plate 30 horizontally arranged above a gap adjuster base 33, two gap adjusting plate pins 24 and two gap adjusting tension springs 28, wherein the two gap adjusting plate pins 24 and the two gap adjusting tension springs 28 are arranged on the gap adjusting plate 30 in a centrosymmetric mode, the two centrosymmetric sides of the gap adjusting plate 30 are respectively provided with a strip-shaped groove, each strip-shaped groove is provided with a gap adjusting plate pin 24, the gap adjusting plate pins 24 penetrate through the strip-shaped grooves to be vertically and fixedly inserted into holes in the top end face of the gap adjuster base 33, and the outer sides of the two strip-shaped grooves are connected with the gap adjuster base 33 through the respective gap adjusting tension springs 28, so that the gap adjusting plate 30 rotates around the midpoint between the two gap adjusting plate pins 24 under the elastic tension force of the gap adjusting tension springs 28.
The edges of two ends of the gap adjusting plate 30 are respectively provided with a shifting tooth plate 34 protruding towards the ratchet rotation gap adjusting assembly, the shifting tooth plate 34 is connected with the ratchet rotation gap adjusting assembly, and the edge of the gap adjusting plate 30 near the shifting tooth plate 34 is provided with a convex point 35 used for being connected with the ratchet rotation gap adjusting assembly. When the shifting tooth end of the gap adjusting shifting plate shifts up the shifting teeth on the ratchet assembly to rotate, the gap adjusting screw rod and the long shaft of the gap adjusting ratchet wheel generate axial separation movement through threads.
The gap adjusting plate pin 24 is inserted into the part of the opening of the gap adjuster base 33 and then is axially fixed through the hollow locking pin 22 horizontally and radially arranged on the gap adjuster base 33.
Open grooves are formed in the connecting end surfaces of the two end gap adjusting screw rods 29, and the shoe ribs 19 of the front shoe assembly 1 and the shoe ribs 19 of the rear shoe assembly 2 are respectively embedded into the open grooves of the gap adjusting screw rods 29 to form impact connection.
A supporting pin 17 is installed at the upper part of the brake bottom plate assembly 11, the upper ends of the front shoe assembly 1 and the rear shoe assembly 2 are respectively and elastically connected to the supporting pin 17 at the upper part of the brake bottom plate assembly 11 through an upper end return spring 4, the upper end return spring 4 is respectively hooked with the upper ends of the front shoe assembly 1, the rear shoe assembly 2 and the supporting pin 17, and a lower end return spring 12 is respectively hooked with the lower ends of the front shoe assembly 1 and the rear shoe assembly 2.
As shown in fig. 3, the front shoe assembly 1 and the rear shoe assembly 2 include a tendon 19, a brake shoe friction plate 18, and a shoe plate 20; the shoe plates 20 are vertically and fixedly connected with the inner side peripheral surface of the shoe ribs 19, and the brake shoe friction plates 18 are fixedly attached to the outer side peripheral surface of the shoe ribs 19; the middle parts of the tendons 19 of the front shoe assembly 1 and the tendons 19 of the rear shoe assembly 2 are connected to the brake base plate assembly 11 through a pressure spring mechanism, the upper ends of the tendons 19 of the front shoe assembly 1 and the tendons 19 of the rear shoe assembly 2 are connected to a stepped shaft of a shoe support pin 17 in a leaning mode, and the lower ends of the tendons 19 of the front shoe assembly 1 and the tendons 19 of the rear shoe assembly 2 are connected through a gap adjusting screw 29 in a lever self-adjusting mechanism device.
As shown in fig. 4, the rear wheel cylinder assembly 3 includes a brake wheel cylinder 36 and pistons 38 sleeved at two ends of a cylinder bore in the brake wheel cylinder 36, the brake wheel cylinder 36 is fixed on an end surface of the brake base plate assembly 11 through a hexagon bolt 9 and a spring washer 10, and the pistons 38 at two ends are respectively abutted against the edge of the shoe rib 19 of the front shoe assembly 1 and the edge of the shoe rib 19 of the rear shoe assembly 2.
As shown in fig. 5, the pressure spring mechanism includes a pressure spring pull rod 7, a pressure spring seat 5 and a pressure spring 6, one end of the pressure spring pull rod 7 is connected to the brake base plate assembly 11, the other end of the pressure spring pull rod 7 passes through a shoe tendon 19 of the front shoe assembly 1 or a shoe tendon 19 of the rear shoe assembly 2 to be connected with the pressure spring seat 5, and the pressure spring 6 is sleeved on the pressure spring pull rod 7 between the pressure spring seat 5 and the shoe tendon 19 of the front shoe assembly 1 or the shoe tendon 19 of the rear shoe assembly 2.
The implementation working principle and process of the invention are as follows:
in the brake of the lever self-gap-adjusting mechanism, a drum drives a shoe to impact the self-gap-adjusting mechanism, and the gap adjustment of the shoe is completed through the lever tooth shifting mechanism.
When the vehicle is braked during running and oil pressure is input into a wheel cylinder of the brake wheel cylinder assembly, the piston end surface of the brake wheel cylinder assembly, which is in contact with a brake shoe rib of the front shoe assembly, pushes the front shoe assembly to move along the brake drum and the rear shoe assembly, so that a friction plate is in contact with the brake drum to brake, the drum drives the shoe to impact the self-gap-adjusting mechanism, when impact force is larger than that of the nut sleeve, the central sleeve is pushed to overcome pressure of a pressure spring, the shoe is expanded, the rotating drum drives a leading shoe to impact the groove bottom of a leading shoe gap-adjusting screw, the gap-adjusting screw 29 pushes the nut sleeve 26, the nut sleeve pushes the central sleeve 27 to overcome pressure of the pressure spring and move leftwards, the inner side surface of ratchet teeth on the inner sleeve of the leading shoe nut pushes a convex point of the gap-adjusting plate 30, and the gap-adjusting plate 30 overcomes the tension of the gap-adjusting tension spring 28 after being pressed, and rotates clockwise around a left fulcrum. The rotation amplitude is determined by the pressed moving distance of the female sleeve, if the moving distance is larger after the female sleeve is pressed, and the rotation amplitude of the tooth shifting plate at the head part of the gap adjusting plate is larger than one ratchet tooth pitch, the tooth is shifted by one tooth from the ratchet wheel of the shoe, so that one-time tooth shifting expansion is completed, the tooth is expanded by 0.027mm outwards from the shoe, and if the rotation amplitude of the tooth shifting plate is smaller than one ratchet tooth pitch, the tooth can not be shifted, namely no gap is adjusted.
And by the same principle, when the backing brake is carried out, the collar shoe is expanded outwards through the ratchet wheel at the collar shoe side by the shifting teeth. When the brake wheel cylinder assembly is decompressed, the front shoe assembly, the gap adjusting screw rod and the rear shoe assembly respectively return under the action of respective return springs, the gap adjusting shifting plate returns under the action of the gap adjusting shifting plate return springs, the gap adjusting shifting plate shifts the gap adjusting ratchet gear to rotate, and the gap adjusting ratchet and the gap adjusting bolt are separated along the axial direction to compensate the abrasion loss between the brake drum and the friction plate. When braking is finished, the central sleeve immediately restores to the original normal state under the thrust of the pressure spring.
If the friction plates of the front and rear shoe assemblies are worn, the gap X between the brake drum and the friction plates is increased. When the clearance X is increased slightly, the clearance adjusting shifting plate and the shifting teeth on the clearance adjusting ratchet assembly are separated by a small distance, so that the shifting tooth end of the clearance adjusting shifting plate and the shifting teeth at the original position are not separated by the tooth pitch of one shifting tooth, then the clearance adjusting shifting plate is shifted to the shifting teeth at the original position when returning, and the gear position on the clearance adjusting ratchet assembly is kept unchanged.
When the clearance X is increased greatly, the clearance adjusting shifting plate and the shifting teeth on the clearance adjusting ratchet assembly are separated by a large distance, so that the tooth shifting distance between the shifting tooth end of the clearance adjusting shifting plate and the shifting tooth at the original position is not less than the tooth pitch of one shifting tooth, then the tooth pitch of more than one tooth is shifted when the clearance adjusting shifting plate returns, so that the gear on the clearance adjusting ratchet assembly rotates, the axial distance between the clearance adjusting screw rod and the clearance adjusting ratchet is increased, the distance between the lower ends of the front shoe assembly and the rear shoe assembly is increased, the abrasion loss between the brake drum and the friction plate is compensated, and the clearance is automatically adjusted.
Therefore, the utility model discloses can carry out the adjustment in two-way direction of advancing or direction of backing up hoof drum clearance voluntarily, can be real-time accurate adjustment hoof drum clearance, need not manual adjustment, saved manual regulation's inconvenience and inaccuracy.
The above examples are for the description of the present invention, not for the limitation of the present invention, and any simple modification of the present invention all belongs to the protection scope of the present invention.
Claims (9)
1. The utility model provides a take two-way self-energizing formula drum brake of two-way lever self-modulation mechanism of striking, includes brake shoe assembly (11), brake drum (16), leading hoof assembly (1), rearmounted hoof assembly (2) and back wheel cylinder assembly (3), and install on the frame brake shoe assembly (11), its characterized in that:
the automatic gap adjusting device comprises a brake base plate assembly (11), a front shoe assembly (1) and a rear shoe assembly (2), and is characterized by further comprising a bidirectional lever self-adjusting mechanism device (8), wherein the rear wheel cylinder assembly (3) is fixedly arranged in the middle of the end face of the brake base plate assembly (11), the front shoe assembly (1) and the rear shoe assembly (2) are respectively arranged on two sides of the brake base plate assembly (11) through respective pressure spring mechanisms, the upper ends of the front shoe assembly (1) and the rear shoe assembly (2) are respectively and elastically connected onto a shoe supporting pin on the upper portion of the brake base plate assembly (11) through respective upper end return springs (4) on two sides, a lower end return spring (12) and a bidirectional lever self-adjusting mechanism device (8) are connected between the lower ends of the front shoe assembly (1) and the rear shoe assembly (2), and the front shoe assembly (1) and the rear shoe assembly (2) are elastically connected onto the bidirectional lever self-adjusting mechanism device (8) through the lower end return spring (12) to perform gap self-adjustment;
the bidirectional lever self-adjusting mechanism device (8) comprises a central sleeve (27), a gap adjuster base (33), a gap adjuster mechanism, a pressure spring assembly and a ratchet wheel rotation gap adjuster assembly, wherein the gap adjuster base (33) is U-shaped, coaxial through holes are formed in two ends of the U-shape, the central sleeve (27) is sleeved in the through holes in the two ends of the U-shape in a penetrating manner, the pressure spring assembly for elastic gap adjustment is sleeved on the central sleeve (27), the ratchet wheel rotation gap adjuster assemblies which are identical in structure and are coaxially installed are arranged at two ends of the central sleeve (27), and the ratchet wheel rotation gap adjuster assemblies at the two ends are respectively connected with a leading shoe and a trailing shoe through respective gap adjusting screw rods (29); the top end of the gap adjuster base (33) is provided with a gap adjusting plate mechanism, the gap adjusting plate mechanism is connected with the ratchet wheel rotating gap adjusting assembly, and the gap adjusting plate mechanism lever is used for shifting the rotation and axial movement of the ratchet wheel rotating gap adjusting assembly to drive the change of the axial distance between the gap adjusting screw rods (29) at the two ends to realize the self-adjusting of the gap.
2. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 1, wherein:
the upper portion of the brake bottom plate assembly (11) is provided with a supporting pin (17), the upper ends of the front shoe assembly (1) and the rear shoe assembly (2) are respectively and elastically connected to the supporting pin (17) on the upper portion of the brake bottom plate assembly (11) through upper end return springs (4), the upper end return springs (4) are respectively hooked with the upper ends of the front shoe assembly (1), the rear shoe assembly (2) and the supporting pin (17), and the lower end return springs (12) are respectively hooked with the lower ends of the front shoe assembly (1) and the rear shoe assembly (2).
3. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 2, wherein:
the front shoe assembly (1) and the rear shoe assembly (2) comprise shoe ribs (19), brake shoe friction plates (18) and shoe plates (20); the shoe plates (20) are vertically and fixedly connected with the circumferential surface of the inner side of the tendon (19), and the brake shoe friction plates (18) are fixedly attached to the circumferential surface of the outer side of the tendon (19); the middle parts of the tendons (19) of the front shoe assembly (1) and the tendons (19) of the rear shoe assembly (2) are connected to a brake bottom plate assembly (11) through a pressure spring mechanism, the upper ends of the tendons (19) of the front shoe assembly (1) and the tendons (19) of the rear shoe assembly (2) are connected to a stepped shaft of a shoe supporting pin (17) in a leaning mode, and the tendons (19) of the front shoe assembly (1) and the lower ends of the tendons (19) of the rear shoe assembly (2) are connected through a gap adjusting screw rod (29) in a lever self-adjusting mechanism device.
4. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 3, wherein:
the rear wheel cylinder assembly (3) comprises a brake wheel cylinder (36) and pistons (38) sleeved at two ends of a cylinder hole in the brake wheel cylinder (36), the brake wheel cylinder (36) is fixed on the end face of the brake bottom plate assembly (11) through a hexagon bolt (9) and a spring washer (10), and the pistons (38) at two ends are respectively abutted to the edge of a tendon (19) of the front shoe assembly (1) and the edge of a tendon (19) of the rear shoe assembly (2).
5. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 3, wherein:
the pressure spring mechanism comprises a pressure spring pull rod (7), a pressure spring seat (5) and a pressure spring (6), one end of the pressure spring pull rod (7) is connected to the brake bottom plate assembly (11), the other end of the pressure spring pull rod (7) penetrates through a shoe tendon (19) of the front shoe assembly (1) or a shoe tendon (19) of the rear shoe assembly (2) to be connected with the pressure spring seat (5), and the pressure spring (6) is sleeved on the pressure spring pull rod (7) between the pressure spring seat (5) and the shoe tendon (19) of the front shoe assembly (1) or the pressure spring (6) between the shoe tendons (19) of the rear shoe assembly (2).
6. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 3, wherein:
an open slot is arranged on the connecting end surface of the two-end gap adjusting screw rod (29), and a tendon (19) of the front hoof assembly (1) and a tendon (19) of the rear hoof assembly (2) are respectively embedded into the open slot of the gap adjusting screw rod (29).
7. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 1, wherein:
the pressure spring assembly comprises a gap adjusting pressure spring (23) and clamping pads (32) located at two ends of the gap adjusting pressure spring (23), an annular groove is formed in the peripheral surface of the central sleeve (27), the gap adjusting pressure spring (23) and the clamping pads (32) are sleeved in the annular groove of the central sleeve (27), the inner ring of each clamping pad (32) abuts against the side wall of the annular groove of the central sleeve (27), and the outer ring of each clamping pad (32) abuts against the end face of a through hole of the gap adjuster base (33);
the ratchet rotation gap adjusting assembly comprises a nut sleeve (26), a ratchet fluted disc (31) and a gap adjusting gasket (25), wherein the nut sleeve (26) is of a stepped shaft structure with a large diameter at the middle end and small diameters at the inner end and the outer end; the inner end of the nut sleeve (26) is movably sleeved in the central through hole of the central sleeve (27), and a gap adjusting gasket (25) is arranged between a middle end shaft shoulder close to the inner end of the nut sleeve (26) and the hole end face of the central through hole of the central sleeve (27); a ratchet fluted disc (31) is fixedly sleeved outside the outer end of the nut sleeve (26), a threaded central hole is formed in the end face of the outer end of the nut sleeve (26), and a clearance adjusting screw rod (29) is sleeved in the threaded central hole through threads;
transfer crack board mechanism including transfer crack board (30) and two transfer crack board round pin (24) and two transfer crack extension springs (28) that the centrosymmetric ground arranged on transferring crack board (30) of horizontal installation above transferring crack ware base (33), transfer crack board (30) are the centrosymmetric structure, transfer crack board (30) centrosymmetric both sides all are equipped with the bar groove, transfer crack board round pin (24) is all installed to every bar groove, transfer crack board round pin (24) and pass the vertical fixed cartridge of bar groove in the trompil of transferring crack ware base (33) top face, thereby the outside of two bar grooves is connected with transferring crack ware base (33) through respective transfer crack extension spring (28) and is connected so that transfer crack board (30) receive the elastic tension of transfer crack extension spring (28) and rotate around the mid point between two transfer crack board round pin (24).
8. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 7, wherein:
transfer clearance board (30) both ends edge all be equipped with towards the protruding dialling pinion rack (34) of ratchet rotation clearance subassembly, dial pinion rack (34) and connect the ratchet rotation clearance subassembly of transferring, dial near the clearance board (30) edge of transferring of pinion rack (34) and be used for adjusting the bump (35) that the clearance subassembly is connected with the ratchet rotation.
9. The bidirectional self-energizing drum brake with the impact type bidirectional lever self-adjusting mechanism as claimed in claim 7, wherein:
the gap adjusting plate pin (24) is inserted into the part in the opening of the gap adjuster base (33) and then is axially fixed through a hollow locking pin (22) horizontally and radially arranged on the gap adjuster base (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021971118.6U CN213981739U (en) | 2020-09-10 | 2020-09-10 | Bidirectional self-boosting drum brake with impact type bidirectional lever self-adjusting mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021971118.6U CN213981739U (en) | 2020-09-10 | 2020-09-10 | Bidirectional self-boosting drum brake with impact type bidirectional lever self-adjusting mechanism |
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| Publication Number | Publication Date |
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| CN213981739U true CN213981739U (en) | 2021-08-17 |
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| CN202021971118.6U Active CN213981739U (en) | 2020-09-10 | 2020-09-10 | Bidirectional self-boosting drum brake with impact type bidirectional lever self-adjusting mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117028455A (en) * | 2023-09-28 | 2023-11-10 | 河北双虎车业配件有限公司 | Bidirectional self-boosting hydraulic drum brake |
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2020
- 2020-09-10 CN CN202021971118.6U patent/CN213981739U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117028455A (en) * | 2023-09-28 | 2023-11-10 | 河北双虎车业配件有限公司 | Bidirectional self-boosting hydraulic drum brake |
| CN117028455B (en) * | 2023-09-28 | 2024-01-02 | 河北双虎车业配件有限公司 | Bidirectional self-boosting hydraulic drum brake |
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