Adjusting arm

Abstract

The present invention provides an adjusting arm, belonging to the technical field of adjusting arms. It solves the problem of high frequency of oil injection maintenance. It includes a housing, a control arm, a cover plate fixed to one side of the housing, a one-way clutch assembly and an external gear ring. The control arm includes a connecting portion and an installation portion fixedly connected to the connecting portion and located outside the housing. The one-way clutch assembly includes a clutch gear meshing with the external gear ring. The connecting portion is annular, the outer peripheral side of the connecting portion has a groove and the cross-section of the connecting portion is generally U-shaped. The external gear ring and the cover plate are sleeved on the connecting portion and located in the groove. The external gear ring is fixedly connected to the connecting portion and a second sealing ring is provided between the two. A third sealing ring abutted against the cover plate is embedded in the side portion of the housing. The third sealing ring includes a first ring body and a second ring body fixedly connected. The clutch gear is located inside the first ring body, the external gear ring is located inside the second ring body, and the meshing portion of the clutch gear and the external gear ring is located at the communication portion of the first ring body and the second ring body. It has the advantages of low frequency of oil injection maintenance, long service life, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of adjusting arms and relates to an adjusting arm. Background Art

[0002] The braking clearance of an automobile refers to the clearance that must be maintained between the brake drum and the friction lining of the brake shoe. During long-term friction, the friction lining will wear, resulting in an increasing braking clearance. Therefore, an adjusting arm that can automatically adjust the braking clearance between the brake shoe and the brake drum must be provided in the braking mechanism. For example, the automatic adjusting arm for automobile braking clearance disclosed in Patent Application No. 03151471.5 includes a housing. A large worm gear and a large worm shaft engaged with the large worm gear are installed in the housing. One end of the large worm shaft is successively provided with a worm spring seat, a worm spring, and a spring screw cap. The spring screw cap is fixedly connected to the housing. A small worm gear is sleeved on the other side of the large worm shaft. Teeth are provided at the end of the small worm gear. Teeth meshing with the teeth at the end of the small worm gear are provided on the large worm shaft. A one-way clutch device is provided on the side of the small worm gear. The one-way clutch device includes a small worm shaft and a clutch gear, which are connected by a pair of meshing one-way gears. The small worm shaft meshes with the small worm gear. A control arm assembly is provided at the end of the large worm gear. The clutch gear meshes with the control arm assembly. Among them, the control arm assembly is composed of a control arm gear, a control arm sleeve, a control arm, and a cover plate. The cover plate is fixed to the housing by screws. The two ends of the control arm sleeve are respectively riveted and fixed to the control arm and the control arm gear so that the control arm can drive the control arm gear to rotate. The control arm gear meshes with the clutch gear, so that when the control arm gear rotates, the clutch gear is driven to rotate to realize the operation of the one-way clutch device. At the same time, a paper gasket is provided between the cover plate and the housing to achieve sealing.

[0003] However, the above-mentioned automatic adjusting arm for automobile braking clearance has some deficiencies in the specific use process: 1. Since the control arm and the control arm gear are fixed by the control arm sleeve, whether it is the riveting position between the control arm and the control arm sleeve or the riveting position between the control arm gear and the control arm sleeve, there are likely to be leakage gaps due to the riveting precision problem, resulting in the lubricating oil in the housing may leak out from here; 2. The paper gasket is provided with hole positions facing the respective mounting holes. When the screw passes through the mounting hole on the cover plate and at the same time passes through the hole position on the paper gasket, since the mounting hole on the cover plate and the hole position on the paper gasket are both larger than the screw, when the first or second screw is tightened, the cover plate or the paper gasket will move, resulting in the mounting hole, the hole position on the paper gasket and the hole position on the adjusting arm housing are no longer aligned. In this way, when the remaining screws are tightened, it is easy to pierce the paper gasket, resulting in a potential hazard of the lubricating oil in the housing leaking out from here. The existence of the above two leakage hazards makes the above-mentioned adjusting arm often have the problem of lubricating oil leaking out of the housing during use, resulting in the user needing to frequently inject oil into the housing for maintenance. Summary of the Invention

[0004] The object of the present invention is to address the above problems existing in the prior art and propose an adjusting arm, which solves the problem of high frequency of oil injection maintenance.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] The adjusting arm includes a housing, a control arm, a cover plate fixed to one side of the housing, and a one-way clutch assembly and an external gear ring that are both located inside the housing and on the same side of the cover plate. The control arm includes a connecting portion and an installation portion fixed to the connecting portion and located outside the housing. The one-way clutch assembly includes a clutch gear meshing with the external gear ring. It is characterized in that the connecting portion is annular, the outer peripheral side of the connecting portion has a groove and the cross-section of the connecting portion is generally U-shaped. The external gear ring and the cover plate are sleeved on the connecting portion and located in the groove. The external gear ring is fixedly connected to the connecting portion and a second sealing ring is provided between the two. A third sealing ring abutted against the cover plate is embedded in the side portion of the housing. The third sealing ring includes a first ring body and a second ring body that are fixedly connected and communicated. The clutch gear is located inside the first ring body, the external gear ring is located inside the second ring body, and the meshing portion of the clutch gear and the external gear ring is located at the communication portion of the first ring body and the second ring body.

[0007] In this adjusting arm, the connecting portion is set to be annular and the cross-section is generally U-shaped. The cover plate and the external gear ring are both sleeved on the connecting portion and located in the groove of the connecting portion. In this way, there will be no riveting points at the external position of the housing. The fixed connection between the external gear ring and the connecting portion means synchronous rotation, and the second sealing ring provided between the external gear ring and the connecting portion will not be worn due to relative rotation, thus eliminating the hidden danger of the lubricating oil in the housing leaking out from the position where the control arm is located. In addition, an irregularly shaped third sealing ring (i.e., the third sealing ring is not a conventional circle) composed of a first ring body and a second ring body that are fixedly connected and communicated is embedded in the side portion of the housing. The clutch gear is located inside the first ring body and the external gear ring is located inside the second ring body. This irregular shape enables this adjusting arm to use the third sealing ring to eliminate the hidden danger of the lubricating oil in the housing leaking out from between the housing and the cover plate within the limited design space on the side portion of the housing. Thus, the lubricating oil in the housing hardly leaks out anymore, thereby greatly reducing the frequency of oil injection maintenance.

[0008] In the above adjusting arm, the connecting portion includes a first annular plate and a second annular plate arranged oppositely and a connecting body connecting the two. The external gear ring is in interference fit with the connecting body, and the first annular plate is fixedly connected to the installation portion.

[0009] When assembling the control arm, the cover plate and the external gear ring, first process a substrate, which needs to include a circular part and a protruding part protruding radially from the circular part (this protruding part is used to form the mounting part). Then, stretch from the center position of the circular part to one side of the circular part, so that the original circular part will naturally form into the first annular plate. Next, put the cover plate and the external gear ring on this stretched part (the external gear ring is fixedly connected to this stretched part in an interference fit manner, and a second sealing ring is arranged between the external gear ring and this stretched part). Finally, rivet the end of this stretched part far from the circular part outward. Thus, this stretched part will naturally form into the second annular plate and a connecting body connecting the first annular plate and the second annular plate. In this way, a connecting part in a ring shape and with a cross-section approximately in a U shape will be obtained, and the cover plate and the external gear ring are located in the groove of the connecting part. Through the above settings, when adjusting the external riveting point of the arm outside the housing, the second sealing ring is located between the synchronously rotating connecting part and the external gear ring, thereby eliminating the hidden danger of lubricating oil leaking outward between the connecting part and the external gear ring. Combined with using the third sealing ring to eliminate the hidden danger of lubricating oil leaking outward between the cover plate and the housing, the oil injection maintenance frequency of the adjusting arm is reduced.

[0010] In the above-mentioned adjusting arm, the inner peripheral wall of the external gear ring has a number of engaging teeth.

[0011] By arranging the engaging teeth on the inner peripheral wall of the external gear ring, when the external gear ring is put on the connecting body, the engaging teeth will be embedded into the outer peripheral wall of the connecting body, making the external gear ring and the connecting body in interference fit, so as to ensure that the external gear ring can form a fixed connection with the connecting part with a U-shaped cross-section to ensure that the second sealing ring will not be worn due to relative rotation, eliminating the hidden danger of lubricating oil leakage and reducing the oil injection maintenance frequency of the adjusting arm.

[0012] Moreover, the method of arranging the engaging teeth on the inner peripheral wall of the external gear ring has almost no influence on the structural strength of the external gear ring.

[0013] In the above-mentioned adjusting arm, the inner peripheral wall of the external gear ring is also provided with a notch, and the tooth gaps between adjacent engaging teeth are all communicated with the notch, and the notch penetrates through one side of the external gear ring close to the first annular plate.

[0014] By arranging the notch on the inner peripheral wall of the external gear ring, the tooth gaps between adjacent engaging teeth are all communicated with the notch, and the notch penetrates through one side of the external gear ring close to the first annular plate. In this way, when the external gear ring and the connecting part are fixedly connected by the engaging teeth being embedded into the outer peripheral wall of the connecting body, the chips squeezed off the outer periphery of the connecting body by the engaging teeth will be located in the notch, which can prevent the chips from being squeezed into the space between the first annular plate and the external gear ring and causing too large a gap between the two, that is, making it difficult for external sewage to enter between the external gear ring and the connecting part to corrode the second sealing ring, thus ensuring the anti-oil leakage effect at the connection between the external gear ring and the connecting body.

[0015] In the above-mentioned adjusting arm, an annular positioning groove is further provided inside the external gear ring. The engaging teeth are located between the annular positioning groove and the notch, and a part of the second sealing ring is located inside the annular positioning groove.

[0016] When the external gear ring is fixedly connected to the connecting part, the engaging teeth squeeze the material at the connecting body into the notch. Therefore, setting the engaging teeth between the annular mounting groove and the notch can ensure that the material squeezed off by the engaging teeth during assembly will not scratch the second sealing ring, guaranteeing the anti-leakage effect of the lubricating oil and reducing the oil injection and maintenance frequency of the adjusting arm.

[0017] In the above-mentioned adjusting arm, the external gear ring includes a main body and a convex ring connected to the side of the main body facing the cover plate. One side of the first annular plate facing the second annular plate has a abutting surface. The convex ring passes through the cover plate and abuts against the abutting surface. The main body is located inside the second ring body, and a first sealing ring is provided between the main body and the cover plate.

[0018] By providing an abutting surface on the side of the first annular plate facing the second annular plate and the convex ring of the external gear ring abutting against the abutting surface, a hard seal can be formed here, which can minimize the entry of sewage and the like from the first annular plate into the space between the external gear ring and the connecting body to corrode the second sealing ring, thereby ensuring the anti-oil leakage effect at the connection between the external gear ring and the connecting body. And the main body of the external gear ring is located inside the second ring body and a first sealing ring is provided between the main body and the cover plate, eliminating the potential lubricating oil leakage between the main body and the cover plate, thus well reducing the oil injection and maintenance frequency of the adjusting arm.

[0019] In the above-mentioned adjusting arm, a convex shoulder is provided between the first annular plate and the connecting body, and the abutting surface is the side wall of the convex shoulder facing the second annular plate.

[0020] By providing a convex shoulder between the first annular plate and the connecting body and setting the abutting surface as the side wall of the first annular plate facing the second annular plate, the flatness of the abutting surface can be better guaranteed during processing, so that the convex ring and the abutting surface can fit better to ensure the hard seal effect.

[0021] In the above-mentioned adjusting arm, both the first ring body and the second ring body have openings. One end of the first ring body is fixedly connected to one end of the second ring body, and the other end of the first ring body is fixedly connected to the other end of the second ring body. Annular mounting grooves one and two are provided on the side of the housing. Annular mounting groove one and annular mounting groove two intersect. The first ring body is located inside annular mounting groove one, and the second ring body is located inside annular mounting groove two.

[0022] By providing intersecting annular mounting grooves one and two on the side of the housing, the side of the housing can embed the third sealing ring in a limited space, forming an effective anti-leakage between the cover plate and the housing without affecting the cooperation between the one-way clutch assembly and the external gear ring, so as to reduce the oil injection and maintenance frequency.

[0023] In the above-mentioned adjusting arm, the first ring body and the second ring body are both in the shape of an open ring, and the first annular mounting groove and the second annular mounting groove are both circular ring-shaped grooves.

[0024] If the first ring body and the second ring body are both in the shape of an open ring, then the first annular mounting groove and the second annular mounting groove can be directly set as circular ring-shaped grooves. This structure is simpler for the processing technology and easier to control in terms of processing accuracy.

[0025] In the above-mentioned adjusting arm, the housing is provided with a first mounting hole and a second mounting hole whose center lines are parallel. The first mounting hole and the second mounting hole intersect. The clutch gear is located at the orifice of the first mounting hole, and the external gear ring is located at the orifice of the second mounting hole. The first mounting hole is located inside the first annular mounting groove and they are concentrically arranged. The second mounting hole is located inside the second annular mounting groove and they are concentrically arranged.

[0026] In order to ensure the cooperation between the external gear ring and the clutch gear, the first mounting hole and the second mounting hole on the existing adjusting arm housing intersect, and the external gear ring and the clutch gear form meshing at the intersection of the first mounting hole and the second mounting hole. By setting the first annular mounting groove to be concentric with the first mounting hole and the second annular mounting groove to be concentric with the second mounting hole, after machining the first annular mounting groove and the second annular mounting groove, they will naturally intersect, so that the adjusting arm can use the third seal ring to form an effective oil leakage prevention between the cover plate and the housing.

[0027] Compared with the prior art, the adjusting arm has the following advantages:

[0028] 1. By setting the connecting part to be annular and having a cross-section approximately in the shape of a U, the cover plate and the external gear ring are both sleeved on the connecting part and located in the groove of the connecting part. In this way, there will be no riveting points at the external position of the housing. The fixed connection between the external gear ring and the connecting part means synchronous rotation, and the second seal ring is arranged between the external gear ring and the connecting part, so there will be no wear due to relative rotation, thus eliminating the hidden danger of the lubricating oil in the housing leaking out from the position where the control arm is located.

[0029] 2. An irregular-shaped third seal ring (i.e., the third seal ring is not a conventional circle) composed of the first ring body and the second ring body which are fixedly connected and communicate with each other is embedded on the side of the housing. The clutch gear is located inside the first ring body and the external gear ring is located inside the second ring body. This irregular shape enables the adjusting arm to use the third seal ring to eliminate the hidden danger of the lubricating oil in the housing leaking out from between the housing and the cover plate within the limited design space on the side of the housing.

[0030] 3. Since the hidden danger of the lubricating oil leaking out from between the housing and the cover plate and the hidden danger of the lubricating oil leaking out from the position where the control arm is located are eliminated, the lubricating oil in the housing hardly leaks out anymore, thus greatly reducing the frequency of oil injection maintenance. Description of the Drawings

[0031] Figure 1 is a schematic diagram of this adjusting arm.

[0032] Figure 2 is a side view of this adjusting arm.

[0033] Figure 3 is Figure 2 a sectional view taken along the A-A direction in

[0034] Figure 4 is a front view of this adjusting arm.

[0035] Figure 5 is Figure 4 a sectional view taken along the B-B direction in

[0036] Figure 6 is Figure 5 an enlarged sectional view of the structure formed by connecting the control arm, outer gear ring and cover plate in

[0037] Figure 7 is Figure 6 an enlarged view of part A in

[0038] Figure 8 is a schematic diagram of the structure formed by connecting the control arm, outer gear ring and cover plate in this adjusting arm.

[0039] Figure 9 is a schematic diagram of the structure formed by connecting the control arm, outer gear ring and cover plate in this adjusting arm from another angle.

[0040] Figure 10A is a schematic diagram of the outer gear ring.

[0041] Figure 10B is a schematic diagram of the outer gear ring from another angle.

[0042] Figure 11 is a schematic diagram of the control arm.

[0043] Figure 12 is a schematic diagram of this adjusting arm when the cover plate and control arm are removed.

[0044] Figure 13 is a schematic diagram of the sealing ring in this adjusting arm.

[0045] Figure 14 is a schematic diagram of the housing in this adjusting arm.

[0046] In the figure, 1 is the housing; 1a is the first mounting hole; 1b is the second mounting hole; 1c is the first annular mounting groove; 1d is the second annular mounting groove; 1e is the fixing hole; 2 is the control arm; 2a is the connecting part; 2a1 is the groove; 2a2 is the first annular plate; 2a21 is the abutting surface; 2a22 is the shoulder; 2a3 is the second annular plate; 2a4 is the connecting body; 2b is the mounting part; 3 is the large worm gear; 4 is the large worm; 5 is the small worm gear; 6 is the spring cover; 7 is the worm spring; 8 is the worm spring seat; 9 is the small worm; 10 is the clutch gear; 11 is the external gear ring; 11a is the engaging tooth; 11b is the notch; 11c is the main body; 11c1 is the annular relief groove; 11c2 is the annular positioning groove; 11c3 is the annular groove; 11d is the convex ring; 12 is the clutch middle gear; 13 is the small worm gear; 14 is the cover plate; 15 is the first sealing ring; 16 is the second sealing ring; 17 is the third sealing ring; 17a is the first ring body; 17b is the second ring body; 18 is the fastener. Detailed implementation mode

[0047] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0048] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 12 shown, the adjusting arm includes a housing 1, a control arm 2, and a large worm gear 3, a large worm 4, and a small worm gear 5 that are all arranged inside the housing 1. The large worm 4 meshes with the large worm gear 3, and the small worm gear 5 is sleeved on the large worm 4 and is close to one end of the large worm 4. Both the side of the large worm 4 and the small worm gear 5 have conical teeth. A spring cover 6 is fixed on the housing 1, and a worm spring 7 and a worm spring seat 8 are arranged inside the housing 1. The worm spring 7 acts on the other end of the large worm 4 through the worm spring seat 8 to make the conical teeth on the large worm 2 mesh with the conical teeth on the small worm gear 5. A one-way clutch device is also arranged inside the housing 1 on the side of the small worm gear 5. The one-way clutch device includes a small worm 9 and a clutch gear 10. The small worm 9 meshes with the small worm gear 5, and the small worm 9 and the clutch gear 10 are connected by a pair of meshing one-way gears. The adjusting arm also includes an external gear ring 11 inside the housing 1. The external gear ring 11 is located on one side of the large worm gear 3. The one-way clutch device also includes a clutch middle gear 12 and a small worm gear 13. The clutch gear 10 is sleeved outside the clutch middle gear 12 and is circumferentially fixed to it. The small worm gear 13 is fixedly connected to the end of the small worm 9. The clutch middle gear 12 and the small worm gear 13 are meshed with each other through one-way teeth. The external gear ring 11 meshes with the clutch gear 10. The adjusting arm also includes a cover plate 14 fixedly connected to the side of the housing 1. The external gear ring 11 and the clutch gear 10 are both located on the same side of the cover plate 14.

[0049] As shown in Figure 5 , Figure 6 , Figure 11 , Figure 12 and Figure 13 shown, the control arm 2 includes a connecting portion 2a and a mounting portion 2b fixedly connected to the connecting portion 2a. The mounting portion 2b is located outside the housing 1. The connecting portion 2a is annular. The outer peripheral side of the connecting portion 2a has a groove 2a1 and the cross-section of the connecting portion 2a is generally U-shaped. The external gear ring 11 and the cover plate 14 are sleeved on the connecting portion 2a and located within the groove 2a1. The external gear ring 11 is fixedly connected to the connecting portion 2a and a second sealing ring 16 is provided therebetween. The connecting portion 2a can rotate relative to the cover plate 14. A third sealing ring 17 abutted against the cover plate 14 is embedded in the side portion of the housing 1. The third sealing ring 17 includes a first ring body 17a and a second ring body 17b which are fixedly connected and communicate with each other. The clutch gear 10 is located inside the first ring body 17a, the external gear ring 11 is located inside the second ring body 17b, and the meshing portion of the clutch gear 10 and the external gear ring 11 is located at the communicating portion of the first ring body 17a and the second ring body 17b. The cover plate 14 and the housing 1 are fixed by a plurality of fasteners 18. Fixing holes 1e for connecting the fasteners 18 are provided on the side portion of the housing 1, and each fixing hole 1e is located outside the third sealing ring 17.

[0050] By setting the connecting portion 2a to be annular and having a generally U-shaped cross-section, the cover plate 14 and the external gear ring 11 are both sleeved on the connecting portion 2a and located within the groove 2a1 of the connecting portion 2a, so that there are no riveting points at the external position of the housing 1. The fixed connection between the external gear ring 11 and the connecting portion 2a means synchronous rotation, and the second sealing ring 16 provided between the external gear ring 11 and the connecting portion 2a will not be worn due to relative rotation, thus eliminating the hidden danger of the lubricating oil in the housing 1 leaking out from the position where the control arm 2 is located. Additionally, an irregularly shaped third sealing ring 17 (i.e., the third sealing ring 17 is not a conventional circle) formed by the fixedly connected and communicating first ring body 17a and second ring body 17b is embedded in the side portion of the housing 1. The clutch gear 10 is located inside the first ring body 17a and the external gear ring 11 is located inside the second ring body 17b. This irregular shape enables the adjustment arm to utilize the third sealing ring 17 to eliminate the hidden danger of the lubricating oil in the housing 1 leaking out from between the housing 1 and the cover plate 14 within the limited design space on the side portion of the housing 1. Thereby, the lubricating oil in the housing 1 hardly leaks out anymore, greatly reducing the frequency of refueling maintenance.

[0051] In this embodiment, as shown in Figure 12 , Figure 13 and Figure 14As shown, both the first ring body 17a and the second ring body 17b have openings. One end of the first ring body 17a is fixedly connected to one end of the second ring body 17b, and the other end of the second ring body 17b is fixedly connected to the other end of the second ring body 17b. On the side of the housing 1, there are a first annular mounting groove 1c and a second annular mounting groove 1d. The first annular mounting groove 1c and the second annular mounting groove 1d intersect. The first ring body 17a is arranged in the first annular mounting groove 1c, and the second ring body 17b is arranged in the second annular mounting groove 1d. Both the first ring body 17a and the second ring body 17b are in the shape of an open circular ring, and both the first annular mounting groove 1c and the second annular mounting groove 1d are circular ring-shaped grooves.

[0052] As Figure 12 and Figure 14 shown, on the housing 1, there are a first mounting hole 1a and a second mounting hole 1b with parallel centerlines. The first mounting hole 1a and the second mounting hole 1b intersect. The one-way clutch assembly is arranged in the first mounting hole 1a, and the clutch gear 10 is located at the orifice of the first mounting hole 1a. The large worm wheel 3 and the external gear ring 11 are both located in the second mounting hole 1b, and the external gear ring 11 is located at the orifice of the second mounting hole 1b. The external gear ring 11 meshes with the clutch gear 10 in the one-way clutch assembly at the intersection of the first mounting hole 1a and the second mounting hole 1b. The first mounting hole 1a is located inside the first annular mounting groove 1c and they are concentrically arranged. The second mounting hole 1b is located inside the second annular mounting groove 1d and they are concentrically arranged.

[0053] Specifically, as Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 11As shown, the connecting part 2a includes an annular plate one 2a2 and an annular plate two 2a3 which are oppositely arranged, and a connecting body 2a4 connecting the annular plate one 2a2 and the annular plate two 2a3. The external gear ring 11 is in interference fit with the connecting body 2a4. The annular plate one 2a2 is fixedly connected to the mounting part 2b, and the mounting part 2b is Z-shaped. The specific assembly method among the external gear ring 11, the cover plate 14 and the control arm 2 is as follows: First, a substrate is processed, and the substrate needs to include a circular part and a protruding part protruding radially from the circular part. Then, it is stretched from the central position of the circular part to one side of the circular part, so that the original circular part will naturally form the annular plate one 2a2. Then, the cover plate 14 and the external gear ring 11 are sleeved on the stretched part (the external gear ring 11 is fixedly connected to the stretched part in an interference fit manner, and a second sealing ring 16 is arranged between the external gear ring 11 and the stretched part). Finally, the end of the stretched part far from the circular part is spin-riveted outwards. Thus, this stretched part will naturally form the annular plate two 2a3 and the connecting body 2a4 connecting the annular plate one 2a2 and the annular plate two 2a3. In this way, a connecting part 2a in a ring shape and with a cross-section approximately U-shaped will be obtained, and the cover plate 14 and the external gear ring 11 are located in the groove 2a1 of the connecting part 2a. The mounting part 2b is formed by bending the protruding part protruding radially from the circular part above.

[0054] As Figure 6 , Figure 7 , Figure 10A and Figure 10B shown, the inner peripheral wall of the external gear ring 11 has a number of engaging teeth 11a. The inner peripheral wall of the external gear ring 11 is also provided with a notch 11b. The tooth gaps between adjacent two engaging teeth 11a are all communicated with the notch 11b. The notch 11b penetrates through the side of the external gear ring 11 close to the annular plate one 2a2. Each engaging tooth 11a is divided into three groups, and the number of notches 11b corresponds to three. When the external gear ring 11 is sleeved on the connecting body 2a4, the engaging teeth 11a will be embedded into the outer peripheral wall of the connecting body 2a4, so that the external gear ring 11 and the connecting body 2a4 are fixedly connected together in an interference fit manner. By providing the notch 11b on the inner peripheral wall of the external gear ring 11, the tooth gaps between adjacent two engaging teeth 11a are all communicated with the notch 11b, and the notch 11b penetrates through the side of the external gear ring 11 close to the annular plate one 2a2. In this way, when the external gear ring 11 and the connecting part 2a are fixedly connected by the engaging teeth 11a being embedded into the outer peripheral wall of the connecting body 2a4, the chips squeezed off from the outer periphery of the connecting body 2a4 by the engaging teeth 11a will be located in the notch 11b, which can prevent the chips from being squeezed into the gap between the annular plate one 2a2 and the external gear ring 11 and causing the gap between the two to be too large.

[0055] Furthermore, as Figure 5 , Figure 6 , Figure 10A and Figure 10BAs shown in the figure, the external gear ring 11 includes a main body 11c and a convex ring 11d connected to one side of the main body 11c facing the cover plate 14. One side of the annular plate one 2a2 facing the annular plate two 2a3 has an abutting surface 2a21. The convex ring 11d passes through the cover plate 14 and abuts against the abutting surface 2a21. The main body 11c is located inside the ring body two 17b. An annular groove 11c3 is provided on one side of the main body 11c facing the cover plate 14, and a first sealing ring 15 that abuts against the cover plate 14 is provided in the annular groove 11c3. By providing the abutting surface 2a21 on one side of the annular plate one 2a2 facing the annular plate two 2a3 and making the convex ring 11d of the external gear ring 11 abut against the abutting surface 2a21, a hard seal can be formed. Specifically, a shoulder 2a22 is provided between the annular plate one 2a2 and the connecting body 2a4, and the abutting surface 2a21 is the side wall of the shoulder 2a22 facing the annular plate two 2a3. An annular relief groove 11c1 is provided between the side of the main body 11c facing away from the cover plate 14 and the inner peripheral wall of the main body 11c. The annular plate two 2a3 is located in the annular relief groove 11c1. An annular positioning groove 11c2 is provided between the bottom wall of the annular relief groove 11c1 and the inner peripheral wall of the main body 11c, and a part of the second sealing ring 16 is located in the annular positioning groove 11c2.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. Adjusting arm, comprising a housing (1), a control arm (2), a cover plate (14) fixed to one side of the housing (1), and a one-way clutch assembly and an external gear ring (11) both located inside the housing (1) and on the same side of the cover plate (14), the control arm (2) comprising a connecting portion (2a) and a mounting portion (2b) fixedly connected to the connecting portion (2a) and located outside the housing (1), the one-way clutch assembly comprising a clutch gear (10) meshing with the external gear ring (11), characterized in that, The described connecting portion (2a) is annular. The outer peripheral side of the connecting portion (2a) has a groove (2a1), and the cross-section of the connecting portion (2a) is generally U-shaped. The external gear ring (11) and the cover plate (14) are sleeved on the connecting portion (2a) and are located within the groove (2a1). The external gear ring (11) is fixedly connected to the connecting portion (2a), and a second sealing ring (16) is provided therebetween. A third sealing ring (17) that abuts against the cover plate (14) is embedded in the side portion of the housing (1). The third sealing ring (17) includes a first ring body (17a) and a second ring body (17b) that are fixedly connected and communicate with each other. The clutch gear (10) is located inside the first ring body (17a), the external gear ring (11) is located inside the second ring body (17b), and the meshing portion of the clutch gear (10) and the external gear ring (11) is located at the communication portion of the first ring body (17a) and the second ring body (17b). The described connecting portion (2a) includes a first annular plate (2a2) and a second annular plate (2a3) that are oppositely arranged, and a connecting body (2a4) that connects the two. The external gear ring (11) is in interference fit with the connecting body (2a4). The inner peripheral wall of the external gear ring (11) has a number of engaging teeth (11a). The inner peripheral wall of the external gear ring (11) also has a notch (11b). The tooth gaps between adjacent engaging teeth (11a) are all communicated with the notch (11b). The notch (11b) penetrates through the side of the external gear ring (11) close to the first annular plate (2a2).

2. The adjusting arm according to claim 1, wherein The first annular plate (2a2) is fixedly connected to the mounting portion (2b).

3. The adjusting arm according to claim 1, characterized in that, An annular positioning groove (11c2) is also provided inside the external gear ring (11). The engaging teeth (11a) are located between the annular positioning groove (11c2) and the notch (11b). A part of the second sealing ring (16) is located within the annular positioning groove (11c2).

4. The adjustment arm according to claim 1 or 2 or 3, characterized in that, The external gear ring (11) includes a main body (11c) and a convex ring (11d) connected to the side of the main body (11c) facing the cover plate (14). The side of the first annular plate (2a2) facing the second annular plate (2a3) has a abutting surface (2a21). The convex ring (11d) passes through the cover plate (14) and abuts against the abutting surface (2a21). The main body (11c) is located inside the second ring body (17b), and a first sealing ring (15) is provided between the main body (11c) and the cover plate (14).

5. The adjusting arm according to claim 4, wherein A shoulder (2a22) is provided between the first annular plate (2a2) and the connecting body (2a4). The abutting surface (2a21) is the side wall of the shoulder (2a22) facing the second annular plate (2a3).

6. The adjusting arm according to claim 1 or 2 or 3, characterized in that Both the first ring body (17a) and the second ring body (17b) have openings. One end of the first ring body (17a) is fixedly connected to one end of the second ring body (17b), and the other end of the first ring body (17a) is fixedly connected to the other end of the second ring body (17b). An annular mounting groove one (1c) and an annular mounting groove two (1d) are provided on the side portion of the housing (1). The annular mounting groove one (1c) and the annular mounting groove two (1d) intersect. The first ring body (17a) is located within the annular mounting groove one (1c), and the second ring body (17b) is located within the annular mounting groove two (1d).

7. The adjusting arm according to claim 6, characterized in that, The described ring body one (17a) and ring body two (17b) are both in the shape of an open circular ring, and the first annular mounting groove (1c) and the second annular mounting groove (1d) are both circular ring-shaped grooves.

8. The adjusting arm according to claim 7, characterized in that, The described housing (1) is provided with a first mounting hole (1a) and a second mounting hole (1b) whose center lines are parallel. The first mounting hole (1a) and the second mounting hole (1b) intersect. The clutch gear (10) is located at the orifice of the first mounting hole (1a), and the external gear ring (11) is located at the orifice of the second mounting hole (1b). The first mounting hole (1a) is located inside the first annular mounting groove (1c) and they are concentrically arranged. The second mounting hole (1b) is located inside the second annular mounting groove (1d) and they are concentrically arranged.

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