Shaft gear one-way self-adjusting mechanism

Abstract

The invention relates to a shaft tooth one-way self-adjusting mechanism, comprising an upper tooth seat, a lower tooth seat and a rotating shaft penetrating from top to bottom, a driving wheel and a dial sleeve are sequentially mounted on the rotating shaft above the upper tooth seat, an adjusting sleeve is mounted on the inner wall surface of the dial sleeve via a one-way bearing, the upper part of the adjusting sleeve passes through the dial sleeve upward, and a cover cap is clamped on the rotating shaft above the adjusting sleeve; a tooth plate group is mounted between the cover cap and the adjusting sleeve; a driven wheel is mounted inside the upper tooth seat and the lower tooth seat, and the driven wheel is meshed with the bevel teeth of the driving wheel; the dial sleeve is subjected to a circumferential rotational force, and drives the rotating shaft and the driving wheel to rotate after passing through the one-way bearing, the adjusting sleeve, the tooth plate group and the cover cap, and the driven wheel rotates accordingly and then drives the external axial compensation mechanism to work, and the compression force of the spring between the dial sleeve and the tooth plate group ensures the friction transmission in the tooth plate group; the invention has a compact and ingenious structure, realizes one-way compensation transmission, is suitable for the clearance self-adjustment of drum brakes, and has good stability.

Description

Technical Field

[0001] The invention relates to the technical field of drum brakes, in particular to a shaft gear one-way self-adjusting mechanism. Background Art

[0002] Commercial vehicle brakes widely use a structure that achieves the braking function through the interaction of friction pairs. The friction pairs corresponding to friction brakes will gradually wear out as the brakes are applied. National regulations require that "brakes should have wear compensation devices" that can automatically compensate for the wear of the friction pairs to ensure the stability of the brake clearance.

[0003] In the prior art, the clearance self-adjusting mechanism can mainly realize the compensation of coaxial rotation. The most commonly used ones are the disc brake self-adjusting mechanism and the drum brake adjusting arm self-adjusting mechanism. Their structures cannot adapt to the requirements of the internal layout of the drum brake. Although the wedge brake compensation self-adjusting mechanism can meet the requirements of the internal layout of the drum brake, the mechanism callback operation is cumbersome and inconvenient for subsequent market maintenance operations. Summary of the invention

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured one-way self-adjusting mechanism for shaft teeth, thereby converting the circumferential rotation around the shaft into a circumferential rotation at an angle to the shaft, and realizing one-way compensatory transmission with a compact structure and good stability.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A shaft tooth one-way self-adjusting mechanism comprises an upper tooth seat and a lower tooth seat which are fixedly mounted in cooperation with each other, a rotating shaft is installed through the upper tooth seat and the lower tooth seat from top to bottom, a transmission wheel is mounted on the rotating shaft above the upper tooth seat; a dial sleeve is gap mounted on the rotating shaft above the transmission wheel, an adjusting sleeve is mounted on the inner wall surface of the dial sleeve through a one-way bearing, the adjusting sleeve is mounted on the rotating shaft, the upper part of the adjusting sleeve passes through the dial sleeve upward, a cover cap is clamped on the rotating shaft above the adjusting sleeve; a tooth plate group is installed between the cover cap and the adjusting sleeve; a supporting shaft is commonly installed on the circumferential wall surfaces of the upper tooth seat and the lower tooth seat, a driven wheel is mounted on the end of the supporting shaft located inside the upper tooth seat and the lower tooth seat, and the driven wheel is meshed and assembled with the transmission wheel.

[0007] As a further improvement of the above technical solution:

[0008] A spring is installed between the adjusting sleeve and the gear plate group.

[0009] The tooth plate group comprises outer tooth plates and inner tooth plates which are stacked at intervals, and friction transmission is performed between adjacent inner tooth plates and outer tooth plates; the inner tooth plates are clamped with the adjustment sleeves, and the outer tooth plates are clamped with the cover caps.

[0010] The inner tooth plate and the outer tooth plate both include a plate body of an annular structure; the inner wall surface of the plate body has a plurality of inner teeth extending inward at intervals along the circumferential direction, and the plate body and the plurality of inner teeth constitute an inner tooth plate; the outer wall surface of the plate body has one or more outer teeth extending outward at intervals along the circumferential direction, and the plate body and the plurality of outer teeth constitute an outer tooth plate.

[0011] The inner tooth piece is clamped with the adjustment sleeve via the inner teeth, and the end of the adjustment sleeve is uniformly provided with inner tooth grooves corresponding to the inner teeth along the circumferential direction; the outer tooth piece is clamped with the cover cap via the outer teeth, and the circumferential wall surface of the cover cap is uniformly provided with outer tooth grooves corresponding to the outer teeth.

[0012] The circumferential wall surface of the transfer sleeve is provided with a transfer hole.

[0013] A gasket is installed between the bottom surface of the dial sleeve and the top surface of the upper gear seat; the gasket includes a superimposed flat gasket and a butterfly gasket.

[0014] The structure of the cap is as follows: it includes a cap body, a flange extending toward the same side at the edge of the cap body, and external tooth grooves are opened inside and outside the flange; a limiting hole is opened in the middle of the cap body, and the cap is mounted on the rotating shaft through the limiting hole, and the limiting hole enables the cap to rotate synchronously with the rotating shaft.

[0015] The axial direction of the support shaft is perpendicular to the axial direction of the rotating shaft. The transmission wheel and the driven wheel are meshed with bevel teeth. The bevel teeth of the driven wheel pass downwardly out of the bottom surface of the lower gear seat.

[0016] The upper gear seat and the lower gear seat are fixed together by fasteners; retaining rings are respectively mounted on both ends of the rotating shaft located above the cover cap and below the lower gear seat.

[0017] The beneficial effects of the present invention are as follows:

[0018] The invention has a compact and reasonable structure and is easy to operate. The circumferential external force drives the adjusting sleeve to rotate, and then drives the rotating shaft and the driving wheel to rotate through the one-way bearing, the adjusting sleeve, the gear plate group and the cap. The driven wheel rotates accordingly and then drives the external axial compensation mechanism to work, thereby realizing the conversion of the external circumferential force parallel to the axial direction of the adjusting sleeve into a circumferential transmission at an angle to the axial direction of the adjusting sleeve. The existence of the one-way bearing ensures the realization of the one-way compensation, thereby facilitating the one-way self-adjusting compensation of the brake clearance in the drum brake. The invention has good stability and is greatly convenient for subsequent market maintenance and replacement.

[0019] The present invention also includes the following advantages:

[0020] The compression force of the spring between the shift sleeve and the gear set ensures the friction transmission between the inner and outer gears in the gear set, which helps to realize the overload protection function inside the mechanism.

[0021] The presence of the butterfly gasket under the dial sleeve effectively buffers the shaking of the dial sleeve under external vibration, thereby ensuring the transmission of circumferential force between the dial sleeve and external parts;

[0022] The one-way self-adjusting mechanism of the present invention is compact, ingenious and small in size, which is convenient for layout and installation in a drum brake, and the clearance can be adjusted through the top of the transmission shaft, which is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is an exploded view of the present invention (the one-way bearing is omitted).

[0025] Figure 3 for Figure 2 A partial enlarged view of part A in the middle.

[0026] Figure 4 It is a schematic diagram of the installation between the adjusting sleeve, the gear set and the cover cap of the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the inner tooth piece of the present invention.

[0028] Figure 6 It is a schematic structural diagram of the outer tooth piece of the present invention.

[0029] Figure 7 It is a structural schematic diagram of the cap of the present invention.

[0030] Among them: 1. Lower gear seat; 2. Upper gear seat; 3. Transmission wheel; 4. Gasket; 5. Adjustment sleeve; 6. Spring; 7. Adjustment sleeve; 8. Gear plate group; 9. Cover cap; 10. Driven wheel; 11. Rotating shaft; 12. Support shaft; 13. Retaining ring; 14. One-way bearing; 51. Adjustment hole; 71. Internal tooth groove; 81. External tooth plate; 811. External teeth; 82. Internal tooth plate; 821. Internal teeth; 91. Cap body; 92. Flanging; 93. External tooth groove; 94. Limit hole. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0032] like Figure 1 and Figure 2As shown, the shaft gear one-way self-adjusting mechanism of this embodiment includes an upper gear seat 2 and a lower gear seat 1 which are fixedly mounted in cooperation with each other. A rotating shaft 11 is installed through the upper gear seat 2 and the lower gear seat 1 from top to bottom. A transmission wheel 3 is sleeved on the rotating shaft 11 above the upper gear seat 2; an adjustment sleeve 5 is sleeved on the rotating shaft 11 above the transmission wheel 3; an adjustment sleeve 7 is installed on the inner wall surface of the adjustment sleeve 5 through a one-way bearing 14, and the adjustment sleeve 7 is sleeved on the rotating shaft 11, and the upper part of the adjustment sleeve 7 passes through the adjustment sleeve 7 upward. The shift sleeve 5 is provided with a cover cap 9 mounted on the rotating shaft 11 located above the adjusting sleeve 7; a tooth plate group 8 is installed between the cover cap 9 and the adjusting sleeve 7; a support shaft 12 is installed on the circumferential wall surface of the upper gear seat 2 and the lower gear seat 1, and a driven wheel 10 is installed at the end of the support shaft 12 located inside the upper gear seat 2 and the lower gear seat 1, and the driven wheel 10 is meshed and assembled with the transmission wheel 3; the existence of the one-way bearing 14 ensures the realization of one-way compensation, thereby facilitating the one-way self-adjusting compensation of the brake clearance in the drum brake.

[0033] A spring 6 is installed between the adjustment sleeve 5 and the tooth plate group 8. The compression force of the spring 6 ensures the friction transmission between the inner tooth plate 82 and the outer tooth plate 81 in the tooth plate group 8, which helps to realize the overload protection function inside the mechanism.

[0034] like Figure 4 As shown, the tooth plate group 8 includes an outer tooth plate 81 and an inner tooth plate 82 which are stacked at intervals, and friction transmission is performed between adjacent inner tooth plates 82 and outer tooth plates 81 ; the inner tooth plate 82 is clamped with the adjustment sleeve 7 , and the outer tooth plate 81 is clamped with the cover cap 9 .

[0035] The inner tooth plate 82 and the outer tooth plate 81 both include a plate body of an annular structure; the inner wall surface of the plate body has a plurality of inner teeth 821 extending inwardly at intervals along the circumferential direction, and the plate body and the plurality of inner teeth 821 constitute the inner tooth plate 82, such as Figure 5 The outer wall of the sheet body extends outwardly along the circumferential direction at intervals with one or more external teeth 811, the sheet body and the plurality of external teeth 811 constitute an external tooth sheet 81, such as Figure 6 shown.

[0036] The inner tooth piece 82 is clamped with the adjustment sleeve 7 via the inner teeth 821, and the end of the adjustment sleeve 7 is uniformly provided with inner tooth grooves 71 corresponding to the inner teeth 821 along the circumferential direction; the outer tooth piece 81 is clamped with the cover cap 9 via the outer teeth 811, and the circumferential wall surface of the cover cap 9 is uniformly provided with outer tooth grooves 93 corresponding to the outer teeth 811.

[0037] like Figure 3 As shown, a dial hole 51 is opened on the circumferential wall surface of the dial sleeve 5; the external circumferential force is applied to the dial sleeve 5 through the dial hole 51, so that the dial sleeve 5 rotates.

[0038] A gasket 4 is installed between the bottom surface of the dial sleeve 5 and the top surface of the upper gear seat 2; the gasket 4 includes a stacked flat gasket and a butterfly gasket. The presence of the butterfly gasket effectively buffers the shaking of the dial sleeve 5 under external vibration, thereby ensuring the transmission of circumferential force between the dial sleeve 5 and external parts.

[0039] like Figure 7 As shown, the structure of the cap 9 is as follows: it includes a cap body 91, a flange 92 extending toward the same side at the edge of the cap body 91, and external tooth grooves 93 are formed inside and outside the flange 92; a limiting hole 94 is formed in the middle of the cap body 91, and the cap 9 is mounted on the rotating shaft 11 through the limiting hole 94, and the limiting hole 94 enables the cap 9 to rotate synchronously with the rotating shaft 11.

[0040] The axial direction of the support shaft 12 is perpendicular to the axial direction of the rotating shaft 11 . The transmission wheel 3 and the driven wheel 10 are meshed with bevel teeth. The bevel teeth of the driven wheel 10 pass through the bottom surface of the lower gear seat 1 downward.

[0041] The upper gear seat 2 and the lower gear seat 1 are fixedly mounted by fasteners; retaining rings 13 are respectively mounted on both ends of the rotating shaft 11 located above the cover cap 9 and below the lower gear seat 1.

[0042] The working principle of the present invention is:

[0043] The circumferential external force acts on the dial sleeve 5 through the dial hole 51, so that the dial sleeve 5 rotates, and the dial sleeve 5 drives the adjustment sleeve 7 to rotate through the one-way bearing 14, and cooperates with the compression pressure of the spring 6 acting on the gear group 8, so that the adjustment sleeve 7 drives the gear group 8 to rotate synchronously, and the gear group 8 drives the cover cap 9 to rotate, and the cover cap 9 drives the rotating shaft 11 to rotate through the limiting hole 94, so that the transmission wheel 3 rotates with the rotating shaft 11, and the driven wheel 10 meshing with the bevel teeth of the transmission wheel 3 rotates, and then the bevel teeth of the driven wheel 10 extending downward from the bottom surface of the lower gear seat 1 drive the external axial compensation mechanism to work, thereby realizing the conversion of the external circumferential force parallel to the axial direction of the dial sleeve 5 into the circumferential transmission of the driven wheel 10 at an angle to the axial direction of the dial sleeve 5;

[0044] When the circumferential external force driving the dial sleeve 5 to rotate exceeds a certain value and is transmitted to the tooth plate group 8 via the one-way bearing 14 and the adjustment sleeve 7, sliding friction will be generated between the inner tooth plate 82 and the outer tooth plate 81 in the tooth plate group 8, so that the tooth plate group 8 as a whole will not rotate synchronously with the adjustment sleeve 7, that is, the adjustment sleeve 7 cannot drive the cover cap 9 to rotate via the tooth plate group 8, thereby playing a role of overload protection.

[0045] When the circumferential external force acts on the adjusting sleeve 5 in the reverse direction through the adjusting hole 51, the adjusting sleeve 5 rotates in the reverse direction. Since the adjusting sleeve 5 and the adjusting sleeve 7 are driven by the one-way bearing 14, the adjusting sleeve 7 does not rotate with the adjusting sleeve 5 due to the presence of the one-way bearing 14.

[0046] Applying force to the top of the rotating shaft 11 causes the rotating shaft 11 to rotate, and transmits the force to the external axial compensation mechanism through the driving wheel 3 and the driven wheel 10, thereby realizing the adjustment of the positive or negative compensation gap of the external axial compensation mechanism, which greatly facilitates the maintenance or replacement operations in the aftermarket.

[0047] The one-way self-adjusting mechanism of the invention is compact, ingenious and small in size, and is convenient for layout and installation in a drum brake.

[0048] The invention has the advantages of simple operation, compact and ingenious structure, effective assistance to the one-way self-adjusting compensation of the brake clearance in the drum brake, good stability and convenient maintenance and replacement.

[0049] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A shaft gear one-way self-adjusting mechanism, characterized in that: The invention comprises an upper gear seat (2) and a lower gear seat (1) which are fixedly mounted in cooperation with each other from top to bottom. A rotating shaft (11) is installed through the upper gear seat (2) and the lower gear seat (1) in sequence from top to bottom. A transmission wheel (3) is sleeved on the rotating shaft (11) located above the upper gear seat (2). An adjustment sleeve (5) is sleeved on the rotating shaft (11) located above the transmission wheel (3). An adjustment sleeve (7) is installed on the inner wall surface of the adjustment sleeve (5) via a one-way bearing (14). The adjustment sleeve (7) is sleeved on the rotating shaft (11). The upper part of the adjustment sleeve (7) passes through the adjustment sleeve (5) upward. A cover cap (9) is clamped on the rotating shaft (11) located above the adjustment sleeve (7). The cover cap (9) and the adjustment sleeve (14) are connected to each other. A tooth plate group (8) is installed between the upper tooth seat (2) and the lower tooth seat (1); a support shaft (12) is installed on the circumferential wall surface of the upper tooth seat (2) and the lower tooth seat (1); a driven wheel (10) is installed at the end of the support shaft (12) located inside the upper tooth seat (2) and the lower tooth seat (1), and the driven wheel (10) is meshed and matched with the transmission wheel (3); a spring (6) is installed between the adjustment sleeve (5) and the tooth plate group (8); the tooth plate group (8) includes an outer tooth plate (81) and an inner tooth plate (82) which are stacked at intervals, and friction transmission is performed between adjacent inner tooth plates (82) and outer tooth plates (81); the inner tooth plate (82) is clamped with the adjustment sleeve (7), and the outer tooth plate (81) is clamped with the cover cap (9).

2. The shaft-tooth one-way self-adjusting mechanism according to claim 1, characterized in that: The inner tooth plate (82) and the outer tooth plate (81) both comprise a plate body of an annular structure; the inner wall surface of the plate body is provided with a plurality of inner teeth (821) extending inwardly at intervals along the circumferential direction, and the plate body and the plurality of inner teeth (821) constitute the inner tooth plate (82); the outer wall surface of the plate body is provided with one or more outer teeth (811) extending outwardly at intervals along the circumferential direction, and the plate body and the plurality of outer teeth (811) constitute the outer tooth plate (81).

3. The shaft-tooth one-way self-adjusting mechanism according to claim 2, characterized in that: The inner tooth piece (82) is clamped with the adjustment sleeve (7) via the inner teeth (821), and the end of the adjustment sleeve (7) is uniformly provided with inner tooth grooves (71) corresponding to the inner teeth (821) along the circumferential direction; the outer tooth piece (81) is clamped with the cover cap (9) via the outer teeth (811), and the circumferential wall surface of the cover cap (9) is uniformly provided with outer tooth grooves (93) corresponding to the outer teeth (811).

4. The shaft-tooth one-way self-adjusting mechanism according to claim 1, characterized in that: The adjusting sleeve (5) has an adjusting hole (51) formed on its circumferential wall surface.

5. The shaft-tooth one-way self-adjusting mechanism according to claim 1, characterized in that: A gasket (4) is installed between the bottom surface of the adjustment sleeve (5) and the top surface of the upper gear seat (2); the gasket (4) comprises a stacked flat gasket and a butterfly gasket.

6. The shaft-tooth one-way self-adjusting mechanism according to claim 1, characterized in that: The structure of the cap (9) is as follows: it comprises a cap body (91), a flange (92) extending toward the same side at the edge of the cap body (91), and external tooth grooves (93) penetrating the flange (92) inside and outside; a limiting hole (94) is provided in the middle of the cap body (91), the cap (9) is sleeved on the rotating shaft (11) through the limiting hole (94), and the limiting hole (94) enables the cap (9) and the rotating shaft (11) to rotate synchronously.

7. The shaft-tooth one-way self-adjusting mechanism according to claim 1, characterized in that: The axial direction of the support shaft (12) is perpendicular to the axial direction of the rotating shaft (11), and the transmission wheel (3) and the driven wheel (10) are meshed with bevel teeth; the bevel teeth of the driven wheel (10) extend downwardly out of the bottom surface of the lower gear seat (1).

8. The shaft-tooth one-way self-adjusting mechanism according to claim 1, characterized in that: The upper gear seat (2) and the lower gear seat (1) are fixedly mounted via fasteners; retaining rings (13) are respectively mounted on both ends of the rotating shaft (11) located above the cover cap (9) and below the lower gear seat (1).

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