High-sealing adjusting arm

Abstract

The utility model provides a high-sealing adjusting arm, which relates to the field of mechanical brake equipment, and comprises an adjusting arm main body, cover plates, a spring, a spring and a spring, the adjusting mechanism is arranged in the adjusting arm main body; the transmission shaft sleeve penetrates through the adjusting mechanism, and a spiral boss extending in the axial direction is arranged on the surface of the transmission shaft sleeve; the connecting part is fixedly connected with the adjusting arm main body; the annular groove and the spiral boss are meshed with each other to form a spiral labyrinth channel. And a positioning groove comprising an elastic sealing ring is formed in the outer wall of the connecting part. By means of the spiral labyrinth channel formed by the spiral boss and the annular groove, the non-closed stepped geometric structure and the groove depth gradient change of the spiral labyrinth channel, invaded dust particles do centrifugal motion, large particles settle at an inlet, small particles are intercepted by the elastic sealing ring at an outlet, dust is effectively blocked, and compared with a traditional sealing structure, the sealing structure has the advantages that the sealing effect is good; and the problems of lubricating grease leakage, foreign matter clamping stagnation and the like caused by dust invasion can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical brake equipment field especially relates to a high sealing adjustment arm. BACKGROUND

[0002] In the mechanical brake system, the adjustment arm is as the core part of the automatic adjustment of the brake gap, and its sealing performance directly influences the reliability of the equipment under the severe working condition such as dust, dampness.

[0003] The traditional adjustment arm adopts static rubber sealing ring (such as O ring) to realize sealing, however, in the high-frequency dynamic adjustment process, the wear gap is easy to produce between the sealing ring and the moving part due to the continuous friction, leading to sealing failure. Especially when the transmission shaft sleeve carries out spiral movement, dust particles are easy to invade the sealing surface along the axial direction, accelerate the aging of the sealing ring, cause the lubricating grease leakage and the foreign matter jamming etc. problems. Although there is the design of the labyrinth sealing structure in the prior art, but it is mostly single static groove structure, cannot effectively adapt to the axial displacement compensation demand in the dynamic adjustment process, and the sealing passage sectional area is fixed, lacks the grading blocking ability to the particulate matter, therefore, a high sealing adjustment arm is proposed. SUMMARY

[0004] The utility model discloses to the deficiency in the prior art, through the spiral type labyrinth passage formed by the spiral boss and annular groove, its non-closed ladder shape geometry and groove depth gradient change, make the invading dust particle do centrifugal motion, large particle settles in the entrance, and small particle is intercepted at the outlet by the elastic sealing ring, effectively block the dust, compared with the traditional sealing structure, can better cope with the dust severe working condition, reduce the lubricating grease leakage, foreign matter jamming etc. problems caused by dust invasion.

[0005] In order to solve the above technical problem, the utility model discloses to solve the problem of poor sealing of traditional adjustment arm through the following technical scheme.

[0006] In order to realize the above purpose, the utility model discloses the following technical scheme:

[0007] A high sealing adjustment arm, comprising:

[0008] The adjustment arm main body is symmetrically connected with the cover plate on the upper and lower ends;

[0009] The adjustment mechanism is arranged in the adjustment arm main body;

[0010] The transmission shaft sleeve is penetrated through the adjustment mechanism, and the transmission shaft sleeve surface is provided with the axial extension spiral boss;

[0011] The connecting part is fixedly connected with the adjustment arm main body, and the inner wall of the connecting part is provided with at least two annular grooves which are equidistantly distributed;

[0012] The annular groove and the spiral boss are engaged to form a spiral type labyrinth passage.

[0013] The outer wall of the connecting part is provided with a positioning groove containing an elastic sealing ring, and forms a double dynamic sealing structure with the labyrinth channel.

[0014] Preferably, the cross section of the labyrinth channel is in a non-closed ladder-shaped geometric structure, and the channel depth changes in a gradient along the axial direction of the transmission shaft sleeve.

[0015] Preferably, the top surface width of the spiral boss and the groove width of the annular groove form a gap fit.

[0016] Preferably, the elastic sealing ring is made of polyurethane material with interference assembly, and the cross section diameter is greater than the depth of the positioning groove.

[0017] Preferably, the end of the connecting part is provided with a radially extending dust baffle ring, and the inner edge thereof forms a dynamic fit gap with the surface of the transmission shaft sleeve.

[0018] Preferably, the joint surface of the cover plate and the main body of the adjusting arm is provided with a composite sealing layer containing alternately arranged metal plating layer and rubber coating layer.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The spiral labyrinth channel formed by the spiral boss and the annular groove has a non-closed ladder-shaped geometric structure and a groove depth gradient change, so that the invading dust particles make centrifugal motion, large particles settle at the inlet, and small particles are intercepted by the elastic sealing ring at the outlet, effectively blocking dust, compared with the traditional sealing structure, better coping with dust harsh working conditions, reducing the problems of grease leakage, foreign matter jamming and the like caused by dust invasion.

[0021] The airflow vortex generated by the non-closed cross section of the labyrinth channel can use centrifugal force to throw out the moisture attached to the surface of the shaft sleeve, prevent moisture from entering the inside of the adjusting arm, avoid internal components from rusting and damaging due to water erosion, and improve reliability in a humid environment.

[0022] The elastic sealing ring is axially compressed and radially expanded, and compensates the radial runout of the transmission shaft sleeve in real time; the dynamic gap between the dust baffle ring and the shaft sleeve inhibits the axial migration of dust, and the two form a double dynamic sealing structure, adapt to the displacement change in the dynamic adjustment process of the transmission shaft sleeve, and maintain a good sealing state. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creating labor.

[0024] Figure 1 It is the whole structure schematic view of the utility model;

[0025] Figure 2 It is the split structure schematic view of the utility model;

[0026] Figure 3 It is the left side view cross section structure schematic view of the utility model;

[0027] Figure 4 It is the left side view cross section structure schematic view of the utility model adjustment arm main body split;

[0028] Figure 5 It is the local structure schematic view of the utility model Figure 4 ;

[0029] Figure 6 It is the transmission shaft sleeve local structure schematic view of the utility model;

[0030] Figure 7 It is the enlarged structure schematic view of the utility model Figure 3 A place;

[0031] Figure number explanation: 1, adjustment arm main body;2, cover plate;3, adjustment mechanism;4, transmission shaft sleeve;5, connecting portion;6, annular groove;7, helical boss;8, labyrinth passage;9, elastic sealing ring;10, positioning groove;11, dust baffle ring;12, composite sealing layer. DETAILED DESCRIPTION

[0032] The utility model will be further described in detail below in combination with the drawings.

[0033] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art. The basic principles defined in the following description can be used in other embodiments, modification schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the utility model.

[0034] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or position indicated by the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the simplified description of the utility model for convenience, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above-mentioned terms cannot be understood as a limitation of the utility model.

[0035] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number. Embodiments

[0036] Please refer to Figures 1-7 A high-sealing adjusting arm comprises:

[0037] An adjusting arm body 1, the upper and lower ends of which are symmetrically connected with cover plates 2;

[0038] An adjusting mechanism 3 arranged inside the adjusting arm body 1;

[0039] A transmission shaft sleeve 4 penetrating through the adjusting mechanism 3, the surface of which is provided with axially extending spiral bosses 7;

[0040] A connecting part 5 fixedly connected with the adjusting arm body 1, the inner wall of which is provided with at least two annular grooves 6 distributed at equal distances;

[0041] The annular grooves 6 and the spiral bosses 7 are mutually engaged to form a spiral labyrinth passage 8;

[0042] The outer wall of the connecting part 5 is provided with a positioning groove 10 containing an elastic sealing ring 9, and forms a double dynamic sealing structure with the labyrinth passage 8.

[0043] The YYY of the present application is mainly composed of the adjusting arm body 1, the cover plates 2, the adjusting mechanism 3, the transmission shaft sleeve 4, the connecting part 5, the annular grooves 6, the spiral bosses 7, the labyrinth passage 8 and the elastic sealing ring 9, and the following is the detailed structure and working principle.

[0044] I. Detailed structure and connection mode of each component

[0045] The adjusting mechanism 3 is installed inside the adjusting arm body 1.

[0046] The cover plates 2 are symmetrically connected to the upper and lower ends of the adjusting arm body 1, and a composite sealing layer 12 is arranged on the joint surface between the cover plates 2 and the adjusting arm body 1, which is composed of alternating metal plating layer and rubber coating layer, to prevent hard particles from being embedded and high-frequency vibration from being absorbed.

[0047] The transmission shaft sleeve 4 penetrates through the adjusting mechanism 3, and the surface of the transmission shaft sleeve 4 is provided with axially extending spiral bosses 7.

[0048] The connecting part 5 is fixedly connected with the adjusting arm body 1, the inner wall of the connecting part 5 is provided with at least two annular grooves 6 distributed at equal distances, the annular grooves 6 and the spiral bosses 7 are mutually engaged to form a spiral labyrinth passage 8, the cross section of the labyrinth passage 8 is in a non-closed stepped geometric structure, and the passage depth changes along the axial direction of the transmission shaft sleeve 4.

[0049] The elastic sealing ring 9 is installed in the positioning groove 10 of the outer wall of the connecting part 5, and is made of polyurethane material with interference assembly, and the cross-sectional diameter is greater than the depth of the positioning groove 10. Meanwhile, the dust-proof ring 11 extending radially is arranged at the end of the connecting part 5, and the inner edge of the dust-proof ring 11 forms a dynamic cooperation gap with the surface of the transmission shaft sleeve 4.

[0050] After assembly, it is checked whether the connection of each part is firm to ensure that the sealing structures such as the labyrinth passage 8, the elastic sealing ring 9, the dust-proof ring 11 and the composite sealing layer 12 are intact and have no installation defects.

[0051] II. Working principle

[0052] When the brake system needs to be adjusted, an external power source such as air pressure, hydraulic pressure or an electric device drives the transmission shaft sleeve 4 to rotate. The transmission shaft sleeve 4 is connected with the adjusting mechanism 3, and its rotary motion is converted into the swing or movement of the adjusting arm through the transmission components such as gears and worm gears inside the adjusting mechanism 3, thereby realizing the adjustment of the brake gap.

[0053] During the rotation of the transmission shaft sleeve 4, the helical boss 7 on the surface thereof interacts with the annular groove 6 on the inner wall of the connecting part 5. Due to the meshing relationship between the two, a spiral labyrinth passage 8 is formed. When dust particles try to invade the inside of the adjusting arm, with the rotation of the transmission shaft sleeve 4, the dust particles are forced to move along the ladder structure of the labyrinth passage 8 under the effect of spiral propulsion. Because the groove depth of the labyrinth passage 8 changes along the axial direction, larger dust particles will settle at the entrance end of the labyrinth passage 8 under the action of centrifugal force and cannot continue to penetrate into the inside; while smaller dust particles can continue to move to the outlet end, but will eventually be intercepted by the elastic sealing ring 9, thereby effectively preventing dust from entering the inside of the adjusting arm and protecting the internal components from dust abrasion and pollution.

[0054] When the transmission shaft sleeve 4 rotates, the non-closed cross section of the labyrinth passage 8 will cause the internal air to swirl. When the water adhering to the surface of the transmission shaft sleeve 4 enters the labyrinth passage 8, under the double action of centrifugal force and swirling airflow, the water will be thrown out of the labyrinth passage 8, avoiding the water from entering the inside of the adjusting arm, preventing the internal components from rusting and damaging due to water erosion, and ensuring the normal work of the adjusting arm in a humid environment.

[0055] The elastic sealing ring 9 is in an axial compression state during installation, which causes radial expansion force. When the transmission shaft sleeve 4 has radial runout during rotation, the elastic sealing ring 9 can compensate for the radial displacement of the transmission shaft sleeve 4 in real time by elastic deformation, always maintain close contact with the surface of the transmission shaft sleeve 4, and maintain good sealing effect. At the same time, the dynamic cooperation gap formed between the dustproof ring 11 and the surface of the transmission shaft sleeve 4 can inhibit the axial migration of dust, further enhance the sealing performance, and effectively prevent dust from entering the inside of the adjustment arm from the axial direction.

[0056] During the working process of the adjustment arm, the composite sealing layer 12 plays an important protective role. When hard particles impact the joint surface of the cover plate 2 and the adjustment arm body 1, the metal plating layer in the composite sealing layer 12 can resist the embedding of hard particles due to its high hardness, and protect the joint surface from damage; and the rubber coating has good elasticity and damping characteristics, can absorb high-frequency vibration, reduce the loosening of the sealing structure and the fatigue damage of the internal components caused by vibration, and thus improve the overall stability and reliability of the adjustment arm.

[0057] It should be understood by those skilled in the art that the embodiments of the utility model shown in the above description and the drawings are only taken as examples and do not limit the utility model. The purpose of the utility model has been completely and effectively realized. The function and structural principle of the utility model have been demonstrated and explained in the embodiments, and the embodiments of the utility model can have any deformation or modification without departing from the principle.

Claims

1. A high-sealing adjusting arm, characterized in that, include: The main body of the adjusting arm (1) has cover plates (2) symmetrically connected to its upper and lower ends. Adjustment mechanism (3) located inside the main body (1) of the adjustment arm. A drive shaft sleeve (4) that passes through the adjustment mechanism (3) has an axially extending helical boss (7) on its surface. The connecting part (5) is fixedly connected to the main body (1) of the adjusting arm, and its inner wall is provided with at least two equally spaced annular grooves (6). The annular groove (6) and the spiral boss (7) mesh with each other to form a spiral labyrinth passage (8). The outer wall of the connecting part (5) is provided with a positioning groove (10) containing an elastic sealing ring (9), which together with the maze channel (8) forms a double dynamic sealing structure.

2. The high-sealing adjusting arm according to claim 1, characterized in that: The cross-section of the maze passage (8) is a non-closed stepped geometric structure, and the depth of the passage varies in gradient along the axial direction of the transmission shaft sleeve (4).

3. The high-sealing adjusting arm according to claim 1, characterized in that: The top surface width of the spiral boss (7) and the groove width of the annular groove (6) form a clearance fit.

4. The high-sealing adjusting arm according to claim 1, characterized in that: The elastic sealing ring (9) is made of polyurethane material with interference fit, and its cross-sectional diameter is greater than the depth of the positioning groove (10).

5. The high-sealing adjusting arm according to claim 1, characterized in that: The end of the connecting part (5) is provided with a radially extending dustproof ring (11), the inner edge of which forms a dynamic fit gap with the surface of the transmission shaft sleeve (4).

6. The high-sealing adjusting arm according to claim 1, characterized in that: The mating surface between the cover plate (2) and the adjusting arm body (1) is provided with a composite sealing layer (12), which includes alternating metal plating and rubber coating.

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