Anti-rollback manual adjusting arm
Through the combined structure of small steel balls, large steel balls, springs and screws, the problem of worm gear and worm gear in overload and harsh environments is solved, and the anti-retraction and sealing effect is achieved, which improves the service life and braking performance of the adjustment arm.
Patent Information
- Application Number
- CN202422544850.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-10-22
AI Technical Summary
The worm gear and worm of the adjustment arm are prone to retract when the vehicle is overloaded, resulting in a decrease in braking efficiency and is susceptible to sand and dust in harsh environments.
The combined structure of small steel balls, large steel balls, springs and screws is adopted. The large steel balls are pushed into and pushed into the large steel balls, and the torque is increased by using the plum sleeve locking function, and the screw position is locked through the locking piece to enhance the anti-retraction capability, while the threaded connection is set to adjust the torque.
Effectively prevent worm gears and worms from falling back, improve braking efficiency, enhance sealing, reduce sand and dust intrusion, and extend service life.
Smart Images
Figure CN223062998U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of adjusting arms, in particular to a manual adjusting arm with anti-back-off function. Background Art
[0002] When the brake pedal is depressed, hydraulic pressure acts on the wheel cylinder, causing the brake shoes to expand and contact the brake drum, generating braking force to slow down or stop the vehicle. Over time, the brake shoes will wear and become thinner, resulting in an increase in the gap between the brake shoes and the brake drum, which may reduce the braking efficiency. The manual adjusting arm adjusts the position of the brake shoes manually to address this situation, ensuring consistent braking performance and allowing the operator to adjust the brake gap as needed to maintain appropriate braking effectiveness.
[0003] However, when the vehicle load is too large, the worm and worm gear of the adjusting arm will have a back-off problem. At this time, it is necessary to increase the torque. The greater the torque, the greater the resistance to back-off, and the less likely it is to occur back-off phenomenon. Summary of the Utility Model
[0004] To solve the above defects, the utility model provides a manual adjusting arm with anti-back-off function, which solves the problem of back-off of the worm and worm gear of the adjusting arm.
[0005] To achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A manual adjusting arm with anti-back-off function, comprising a housing, a worm gear installed inside the housing and cooperating with a worm driving the worm gear. The worm includes a spiral tooth sleeve and a nut rod inserted inside the spiral tooth sleeve. One end of the nut rod is provided with a nut, and a cavity is opened inside. Two symmetrical through holes are opened at the end of the cavity and penetrate to the outer wall of the nut rod. Small steel balls are placed inside the through holes. Inside the cavity, a large steel ball, a spring and a screw are arranged in sequence from inside to outside. The screw is threadedly connected with the nut. When the screw is screwed in, it presses the spring to push the large steel ball, and the two small steel balls in contact with the large steel ball are extruded to move outwards along the through holes. The small steel balls cooperate with a plum blossom sleeve arranged inside the housing to achieve a locking function; a step is opened on the end face of the nut, and an annular sheet-shaped lock piece for preventing the screw from backing off is press-fitted inside the step by interference fit.
[0007] Further, the spiral tooth sleeve meshes with the worm gear, and the worm gear cooperates with a brake camshaft.
[0008] Further, a clamping groove and a chamfer are arranged at one end of the nut rod away from the nut.
[0009] Further, the aperture of the through hole is larger than the diameter of the small steel ball.
[0010] Further, the screw is an internal hexagonal screw.
[0011] Further, the inner ring diameter of the lock washer is larger than the inner hexagonal aperture diameter of the screw.
[0012] The beneficial effects of adopting the above technical solutions are as follows:
[0013] 1. By setting small steel balls, large steel balls, springs and screws, when the screw is screwed in, it compresses the spring to push the large steel ball, and squeezes the two small steel balls in contact with the large steel ball to move outwards along the through hole. The cooperation between the small steel balls and the plum blossom sleeve arranged inside the housing realizes the locking function. When the vehicle is overloaded or even severely overloaded, the worm and worm gear will not retreat even with a large torque, and it has good sealing performance, reducing the entry of dust into the housing in harsh environments.
[0014] 2. By setting the screw and nut connected by threads, the tightness between the small steel ball and the plum blossom sleeve can be adjusted by adjusting the screwing position of the screw, thereby affecting the torque adjusted by the nut rod and increasing the resistance to the retreat of the adjusting arm.
[0015] 3. By setting the lock washer, the position of the screw is locked by press-fitting it into the step with interference, further increasing the resistance to the retreat of the adjusting arm. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural view with partial section of an embodiment of the present invention;
[0017] Figure 2 is a schematic structural view with partial section of the nut rod of an embodiment of the present invention.
[0018] REFERENCE SIGNS
[0019] 1. Housing; 2. Worm gear; 3. Worm; 31. Spiral tooth sleeve; 32. Nut rod; 321. Nut; 3211. Step; 322. Cavity; 323. Through hole; 324. Card slot; 325. Chamfer; 4. Small steel ball; 5. Large steel ball; 6. Spring; 7. Screw; 8. Plum blossom sleeve; 9. Lock washer. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0021] Refer to Figure 1 and Figure 2, A manual adjustment arm that prevents backward movement, comprising a housing, a worm gear installed inside the housing and used in cooperation therewith, and a worm shaft driving the worm gear. The worm shaft includes a spiral tooth sleeve and a nut rod inserted inside the spiral tooth sleeve. One end of the nut rod is provided with a nut, and a cavity is formed inside. Two symmetrical through holes are formed at the tail end of the cavity and penetrate to the outer wall of the nut rod. Small steel balls are placed inside the through holes. A large steel ball, a spring and a screw are sequentially arranged inside the cavity from the inside to the outside. The screw is threadedly connected to the nut. When the screw is screwed in, it presses the spring to push the large steel ball, squeezing the two small steel balls in contact with the large steel ball to move outwards along the through holes. The small steel balls cooperate with a plum blossom sleeve arranged inside the housing to achieve a locking function; a step is formed on the end face of the nut, and an annular flake lock washer for preventing the screw from backing off is press-fitted inside the step with an interference fit.
[0022] With the above technical solution, by setting small steel balls, large steel balls, springs and screws, when the screw is screwed in, it presses the spring to push the large steel ball, squeezing the two small steel balls in contact with the large steel ball to move outwards along the through holes. The small steel balls cooperate with a plum blossom sleeve arranged inside the housing to achieve a locking function. When the vehicle is overloaded or even severely overloaded, the worm gear and worm shaft will not move backward even with a large torque, and it has good sealing performance, reducing the entry of dust into the housing under harsh environments; by setting a screw and a nut connected by threads, the tightness between the small steel ball and the plum blossom sleeve can be adjusted by adjusting the screwing position of the screw, thereby affecting the torque of the nut rod adjustment and increasing the resistance to backward movement. When the small steel balls are completely stuck inside the plum blossom sleeve, the torque is the largest, which can extend the service life of the adjustment arm. By setting a lock washer, the position of the nut is locked by press-fitting it into the step with an interference fit, further increasing the resistance to backward movement.
[0023] Reference Figure 1 And Figure 2 , The spiral tooth sleeve meshes with the worm gear, and the worm gear is used in cooperation with a brake camshaft.
[0024] With the above technical solution, by setting the spiral tooth sleeve to mesh with the worm gear and the worm gear to be used in cooperation with the brake camshaft, the nut rod can be fixed to the spiral tooth sleeve. By rotating the nut rod, the spiral tooth sleeve is driven to rotate, thereby driving the meshing worm gear to rotate, and then driving the brake camshaft to work to adjust the brake clearance.
[0025] Reference Figure 1 And Figure 2 , A clamping groove and a chamfer are provided at one end of the nut rod away from the nut.
[0026] With the above technical solution, by setting a clamping groove and a chamfer at one end of the nut rod away from the nut, the main purpose of the clamping groove is to install and fix the nut rod inside the housing, and the purpose of setting the chamfer is to facilitate insertion into the opening of the housing during assembly.
[0027] Reference Figure 1 and Figure 2 wherein the aperture of the through hole is larger than the diameter of the small steel ball.
[0028] Adopting the above technical solution, by setting the aperture of the through hole to be larger than the diameter of the small steel ball, it is convenient for the small steel ball to move inside the through hole, and butter is used for lubrication and fixation during installation.
[0029] Reference Figure 1 and Figure 2 wherein the screw is an internal hexagonal screw.
[0030] Adopting the above technical solution, by setting the screw to be an internal hexagonal screw, it is convenient for installation and torque adjustment.
[0031] Reference Figure 1 and Figure 2 wherein the inner ring diameter of the lock washer is larger than the inner hexagonal aperture of the screw.
[0032] Adopting the above technical solution, by setting the inner ring diameter of the lock washer to be larger than the inner hexagonal aperture of the screw, it is convenient for the hexagonal wrench to enter the inner hexagon of the screw through the hole in the middle of the lock washer. After the screw is screwed in a certain distance, the lock washer can be further pressed into the step to lock the screw.
[0033] In the present utility model, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0034] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0035] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, making equivalent substitutions or changes should be covered within the protection scope of the present utility model.
Claims
1. A manual adjustment arm that prevents backtracking, comprising a housing (1), a worm gear (2) installed inside the housing (1) and used in cooperation therewith, and a worm (3) for driving the worm gear (2), characterized in that: The worm (3) includes a spiral tooth sleeve (31) and a nut rod (32) inserted inside the spiral tooth sleeve (31). One end of the nut rod (32) is provided with a nut (321), and a cavity (322) is formed inside. Two symmetric through holes (323) penetrating through the outer wall of the nut rod (32) are formed at the tail end of the cavity (322). Small steel balls (4) are placed inside the through holes (323). A large steel ball (5), a spring (6) and a screw (7) are sequentially arranged inside the cavity (322) from inside to outside. The screw (7) is threadedly connected with the nut (321). When the screw (7) is screwed in, it compresses the spring (6) to push the large steel ball (5), and the two small steel balls (4) in contact with the large steel ball (5) are extruded to move outwards along the through holes (323). The small steel balls (4) cooperate with a plum blossom sleeve (8) arranged inside the housing (1) to achieve a locking function. A step (3211) is formed on the end face of the nut (321), and an annular flake lock washer (9) for preventing the screw (7) from backing off is press-fitted into the step (3211) with an interference fit.
2. The manual adjustment arm for preventing back-off according to claim 1, characterized in that: The spiral tooth sleeve (31) meshes with the worm gear (2), and the worm gear (2) is used in cooperation with a brake camshaft.
3. The manual adjustment arm with anti-back-off according to claim 1, characterized in that: A clamping groove (324) and a chamfer (325) are formed at one end of the nut rod (32) away from the nut (321).
4. The manual adjustment arm with anti-backoff according to claim 1, characterized in that: The aperture of the through hole (323) is larger than the diameter of the small steel ball (4).
5. A manual adjustment arm for preventing back-off, characterized in that: The screw (7) is an internal hexagonal screw.
6. The manual adjustment arm with anti-back-off according to claim 1, wherein: The inner ring diameter of the lock washer (9) is larger than the inner hexagonal aperture of the screw (7).