Wiper arm limiting and self-locking structure of windscreen wiper

Abstract

The utility model discloses a wiper arm limit self-locking structure, including arm seat, C-shaped pull hook, tension spring, arm plate and adjusting lever, one end of arm plate is rotatingly connected with arm seat through rotating shaft, the adjusting lever is slideably arranged on arm plate, one end of C-shaped pull hook is hitched on arm seat, the other end of C-shaped pull hook is hitched on the arm seat, and the other end of C-shaped pull hook is hitched on the arm seat. The other end of the C-shaped pull hook is connected with one end of the tension spring, and the end, away from the C-shaped pull hook, of the tension spring is connected with the adjusting rod. At least one side of the left inner side and the right inner side of the arm plate is provided with a boss, the arm base is provided with a limiting check block used for forming circumferential stroke limiting on the boss, and when the arm plate is rotated, the boss abuts against the limiting check block tightly under the action of a tension spring. The wiper component can be prevented from being damaged during maintenance and installation, and the safety of maintenance and installation personnel is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a position limiting self-locking structure of a wiper arm. Background Art

[0002] The wiper is a direct device responsible for cleaning the windshield of the car, removing rain, snow, dust and other debris from the windshield, providing the driver with a better driving view and ensuring safe driving. As a sample of safety performance, the car wiper is widely valued by vehicle manufacturers. The wiper consists of four major component systems: wiper motor, wiper transmission connecting rod, wiper arm and wiper blade. The stability of the wiper arm system pressure can ensure the fit and compression of the wiper blade to the windshield when the wiper is wiping, improving the wiping quality and durability.

[0003] The traditional wiper arm uses a hook to contact the arm seat to achieve the limit of the wiper arm lifting, and uses the torque generated by the spring over the rotation axis and the limit to form a self-locking. However, in this structure, after the wiper arm assembly is self-locked, when the user continues to pull the wiper arm, the hook tension spring will fall off, resulting in the wiper arm without pressure, the wiper wiper fails, and the wiper arm hits the surface of the arm seat. Therefore, it is necessary to improve the above structure. Utility Model Content

[0004] The utility model aims to provide a wiper arm limit self-locking structure, which can prevent the wiper components from being damaged during maintenance and installation, and protect the safety of maintenance and installation personnel.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wiper arm limit self-locking structure, comprising an arm seat, a C-shaped hook, a tension spring, an arm plate and an adjusting rod, one end of the arm plate is rotatably connected to the arm seat through a rotating shaft, and the adjusting rod is slidably arranged on the arm plate, one end of the C-shaped hook is hung on the arm seat, the other end of the C-shaped hook is connected to one end of the tension spring, and the end of the tension spring away from the C-shaped hook is connected to the adjusting rod; at least one of the left and right inner sides of the arm plate is provided with a boss, and the arm seat is provided with a limit block for limiting the circumferential stroke of the boss, and when the arm plate is rotated, the arm plate is acted upon by the tension spring so that the boss is tightly pressed against the limit block.

[0006] By adopting the above technical solution, a rigid structure is set between the relative rotation position of the arm base and the arm plate, that is, by setting a boss on the arm plate and cooperating with the limit block set on the arm base to limit the position, the arm plate is pushed by force F, and when the boss on the arm plate contacts the limit block on the arm base, a limit is formed, and a self-locking is formed with the tension provided by the tension spring. If a larger force F1 is continued to be used to push the arm plate, the arm plate can still maintain the limit position, thereby effectively preventing damage to the wiper components during maintenance and installation, and protecting the safety of maintenance and installation personnel.

[0007] The utility model is further configured that the limit blocks are symmetrically arranged on the left and right sides of the arm seat, and the bosses are symmetrically arranged on the left and right sides of the arm plate, and the bosses are matched with the corresponding limit blocks.

[0008] By adopting the above technical solution, the limiting self-locking structures are symmetrically arranged on both sides, the force is evenly distributed, and the matching structure is more reliable.

[0009] The utility model is further configured that the limit stopper is in a long strip structure, and the limit stopper extends radially along the rotating shaft.

[0010] By adopting the above technical solution, the limit stop block is set as a long strip structure, which can reduce the position accuracy requirements for the boss and reduce the processing difficulty.

[0011] The utility model is further configured such that a supporting protrusion is symmetrically arranged on the left and right sides of the arm seat, and the end faces of the supporting protrusions are fitted with the inner sides of the arm plates, so that a clearance gap for the boss to move is formed between the left and right sides of the arm seat and the arm plates.

[0012] By adopting the above technical solution, the boss can be driven to move smoothly in the clearance gap when the arm plate rotates.

[0013] The utility model is further configured that the supporting protrusion is annular in shape, and the supporting protrusion is coaxially arranged with the rotating shaft.

[0014] By adopting the above technical solution, the annular supporting protrusion has high structural strength, a large contact area and a more reliable structure.

[0015] The utility model is further configured that the limit stopper is arranged at the outer edge of the supporting protrusion, and the thickness of the limit stopper is not greater than that of the supporting protrusion.

[0016] By adopting the above technical solution, the limit stop block and the supporting protrusion are connected together, which not only has higher structural strength and is not easy to deform, but also is more convenient to process. In addition, the thickness of the limit stop block is not greater than the supporting protrusion, so that the end face of the supporting protrusion can effectively support the arm plate, and the structural stability is better.

[0017] The utility model is further configured that a shaft hole for inserting the rotating shaft is opened on the arm seat, and a shaft sleeve is sandwiched between the inner wall of the shaft hole and the outer wall of the rotating shaft.

[0018] By adopting the above technical solution, the friction encountered by the arm plate during rotation can be reduced, which not only makes the rotation easier but also prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the arm plate of the utility model;

[0021] Figure 3 It is a structural schematic diagram of the arm seat of the utility model;

[0022] Figure 4 It is a partial cross-sectional view of the utility model;

[0023] Figure 5 for Figure 4 The enlarged structural diagram of the middle A part;

[0024] Figure 6 It is a schematic diagram of the limiting matching structure of the arm seat and the arm plate of the utility model.

[0025] In the figure: 1. arm seat; 2. C-shaped hook; 3. tension spring; 4. arm plate; 5. adjustment rod; 6. rotating shaft; 7. boss; 8. limit stop; 9. supporting protrusion; 10. clearance; 11. shaft hole; 12. shaft sleeve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example: As attached Figures 1 to 6The wiper arm limit self-locking structure shown in the figure includes an arm seat 1, a C-shaped hook 2, a tension spring 3, an arm plate 4 and an adjusting rod 5, one end of the arm plate 4 is rotatably connected to the arm seat 1 through a rotating shaft 6, and the adjusting rod 5 is slidably arranged on the arm plate 4, one end of the C-shaped hook 2 is hung on the arm seat 1, the other end of the C-shaped hook 2 is connected to one end of the tension spring 3, and the end of the tension spring 3 away from the C-shaped hook 2 is connected to the adjusting rod 5; at least one of the left and right inner sides of the arm plate 4 is provided with a boss 7, and the boss 7 can be formed by stamping, and the arm seat 1 is provided with a limit block 8 for limiting the circumferential stroke of the boss 7, and when the arm plate 4 is rotated, the arm plate 4 is acted upon by the tension spring 3 so that the boss 7 is tightly pressed against the limit block 8. A rigid structure is provided between the relative rotation positions of the arm base 1 and the arm plate 4, that is, by providing a boss 7 on the arm plate 4 and cooperating with the limit stopper 8 provided on the arm base 1 to limit the position, the arm plate 4 is pushed by force F, and when the boss 7 on the arm plate 4 contacts the limit stopper 8 on the arm base 1, a limit is formed, and a self-locking is formed with the tension provided by the tension spring 3. When a larger force F1 is continued to be used to push the arm plate 4, the arm plate 4 can still maintain the limit position, thereby effectively preventing damage to the wiper components during maintenance and installation, and protecting the safety of maintenance and installation personnel.

[0028] The boss 7 structure on the arm plate 4 and the limit stop block 8 structure on the arm seat 1 can be interchanged.

[0029] More specifically, as attached Figure 6 As shown, in this embodiment, the limit blocks 8 are symmetrically arranged on the left and right sides of the arm seat 1, and the bosses 7 are symmetrically arranged on the left and right sides of the arm plate 4, and the bosses 7 are matched with the corresponding limit blocks 8. The limit self-locking structures are symmetrically arranged on both sides, the force is evenly applied, and the matching structure is more reliable.

[0030] As attached Figure 3 As shown, the limit stopper 8 is in a long strip structure, and the limit stopper 8 extends radially along the rotating shaft 6, such as a straight line shape, and the boss 7 can be designed as a cylindrical convex structure. The limit stopper 8 is set as a long strip structure, which can reduce the position accuracy requirements of the boss 7 and reduce the difficulty of processing.

[0031] As attached Figure 6 As shown, a supporting protrusion 9 is symmetrically provided on the left and right sides of the arm seat 1, and the end surface of the supporting protrusion 9 is in contact with the inner side of the arm plate 4, so that a clearance gap 10 for the movement of the boss 7 is formed between the left and right sides of the arm seat 1 and the arm plate 4, so that the boss 7 can move smoothly in the clearance gap 10 when the arm plate 4 rotates.

[0032] As attached Figure 5As shown, the support protrusion 9 is annular in shape, and the support protrusion 9 is coaxially arranged with the rotating shaft 6. The annular support protrusion 9 has high structural strength, large contact area, and more reliable structure.

[0033] In addition, the supporting protrusion 9 may also be in other shapes, such as a plurality of protrusions distributed in a circular array.

[0034] The stopper 8 is arranged at the outer edge of the support protrusion 9, and the thickness of the stopper 8 is not greater than that of the support protrusion 9. In this embodiment, the thickness of the stopper 8 is equivalent to that of the support protrusion 9. The stopper 8 and the support protrusion 9 are connected together, which not only has higher structural strength and is not easy to deform, but also is more convenient to process. In addition, the thickness of the stopper 8 is not greater than that of the support protrusion 9, so that the end surface of the support protrusion 9 can effectively support the arm plate 4, and the structural stability is better.

[0035] As attached Figure 5 As shown, the arm base 1 is provided with an axial hole 11 for inserting the rotating shaft 6, and a shaft sleeve 12 is sandwiched between the inner wall of the axial hole 11 and the outer wall of the rotating shaft 6. This design can reduce the friction of the arm plate 4 when rotating, not only making the rotation easier, but also prolonging the service life.

Claims

1. A wiper arm limit self-locking structure, comprising an arm base (1), a C-shaped hook (2), a tension spring (3), an arm plate (4) and an adjusting rod (5), wherein one end of the arm plate (4) is rotatably connected to the arm base (1) via a rotating shaft (6), the adjusting rod (5) is slidably arranged on the arm plate (4), one end of the C-shaped hook (2) is hung on the arm base (1), the other end of the C-shaped hook (2) is connected to one end of the tension spring (3), and the end of the tension spring (3) away from the C-shaped hook (2) is connected to the adjusting rod (5); characterized in that: At least one of the left and right inner sides of the arm plate (4) is provided with a boss (7), and the arm seat (1) is provided with a limit stopper (8) for limiting the circumferential travel of the boss (7). When the arm plate (4) is rotated, the arm plate (4) is acted upon by a tension spring (3) so that the boss (7) and the limit stopper (8) are tightly pressed against each other.

2. A wiper arm position limiting self-locking structure according to claim 1, characterized in that: The position-limiting blocks (8) are symmetrically arranged on the left and right sides of the arm seat (1), and the bosses (7) are symmetrically arranged on the left and right sides of the arm plate (4), and the bosses (7) cooperate with the corresponding position-limiting blocks (8).

3. A wiper arm limit self-locking structure according to claim 1 or 2, characterized in that: The limit stopper (8) is in the form of an elongated strip, and the limit stopper (8) extends radially along the rotating shaft (6).

4. A wiper arm position limiting self-locking structure according to claim 2, characterized in that: A supporting protrusion (9) is symmetrically arranged on the left and right sides of the arm seat (1), and the end surface of the supporting protrusion (9) is in contact with the inner side of the arm plate (4), so that a clearance gap (10) for the boss (7) to move is formed between the left and right sides of the arm seat (1) and the arm plate (4).

5. A wiper arm limit self-locking structure according to claim 4, characterized in that: The supporting protrusion (9) is annular in shape, and the supporting protrusion (9) is coaxially arranged with the rotating shaft (6).

6. A wiper arm limit self-locking structure according to claim 5, characterized in that: The position-limiting stopper (8) is arranged at the outer edge of the supporting protrusion (9), and the thickness of the position-limiting stopper (8) is not greater than that of the supporting protrusion (9).

7. The wiper arm position limiting self-locking structure according to claim 1, characterized in that: The arm seat (1) is provided with an axial hole (11) for inserting the rotating shaft (6), and a shaft sleeve (12) is sandwiched between the inner wall of the axial hole (11) and the outer wall of the rotating shaft (6).

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