Eccentric bolt

Abstract

The utility model discloses an eccentric bolt which comprises a screw rod and a head part which are connected with each other, and further comprises an eccentric gasket, a D-shaped through hole is formed in the eccentric gasket, an adaptive part matched with the through hole in shape is integrally formed on the root part, close to the head part, of the screw rod, and the section of the adaptive part is also D-shaped. According to the utility model, the root part of the screw rod adopts the D-shaped hobbing structure, the adaptive D-shaped through hole is also formed in the eccentric gasket, and after the eccentric gasket is riveted on the screw rod, the anti-rotation torsion of a product mainly depends on the occlusion of D and D, so that even if the riveting tolerance of the eccentric gasket and the screw rod exceeds the requirement, the eccentric gasket can not rotate, and the product can not be damaged. And after the product is installed and used for a long time, the eccentric gasket and the screw cannot rotate relatively, the product performance is stable, and the anti-rotation torsion of the product is increased.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to an eccentric bolt. Background Technology

[0002] The bolts connecting the control arm or connecting rod to the axle are generally eccentric bolts. Rotating these bolts allows for fine-tuning of the actual connection length between the control arm and the axle, and simultaneously changes their tilt angle.

[0003] Eccentric bolts generally consist of a screw and an eccentric washer. In commercially available eccentric bolts, the root of the screw typically uses a circular hobbing structure, while the eccentric washer usually has a circular hole structure. After the eccentric washer is riveted onto the screw to form an eccentric bolt, the product's resistance to rotational torque is mainly ensured by the tolerance fit between the screw and the eccentric washer. This structure has three potential failure modes:

[0004] 1. It is impossible to guarantee the consistency of torque for each product during processing: The equipment and tools will wear out during long-term processing. When the outer diameter of the circular hob in the screw and the inner diameter of the circular hole in the eccentric washer exceed the riveting tolerance, the torque after riveting is lower than the standard value.

[0005] 2. The product may fail during long-term use after being installed on the vehicle: As long as the car is moving, the eccentric screw will be subjected to external forces. When the screw and eccentric washer exceed the riveting tolerance, the eccentric washer is prone to rotation, which will cause the product to fail.

[0006] 3. The product's resistance to rotational torque is generally only 150 N / m.

[0007] To address the aforementioned drawbacks, further improvements to the eccentric bolt are needed. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides an eccentric bolt to solve the problems mentioned in the background section.

[0009] This utility model provides the following technical solution: an eccentric bolt, including a screw and a head connected to each other, and an eccentric washer. The eccentric washer has a D-shaped through hole. The root of the screw near the head has an integrally formed fitting part that matches the shape of the through hole. The cross-section of the fitting part is also D-shaped. The eccentric washer is engaged with the fitting part through the through hole, so that the axis of the eccentric washer is not collinear with the axis of the screw.

[0010] Preferably, the screw has an arc-shaped groove machined in its threaded surface, and the arc-shaped groove extends downward through the screw.

[0011] Preferably, the upper end of the arc-shaped groove is provided with a gradual groove, and the depth of the gradual groove gradually decreases in the upward direction.

[0012] Preferably, the arc-shaped groove and the tapered groove are aligned with the planar area in the adapter.

[0013] Preferably, the curved surface in the adapter is machined into a tooth profile by gear hobbing.

[0014] Preferably, the outer edge of the upper side of the eccentric gasket is provided with a plurality of pointing grooves pointing to the axis of the eccentric gasket.

[0015] Preferably, the pointing grooves are arranged at equal angles, and there is an odd number of pointing grooves. The length of the middle pointing groove is greater than the length of the other pointing grooves, and the middle pointing groove points to the axis of the screw and the eccentric washer.

[0016] This utility model provides an eccentric bolt, which has the following beneficial effects:

[0017] The screw root of this invention adopts a D-shaped hobbing structure, and the eccentric washer is also provided with a matching D-shaped through hole. After the eccentric washer is riveted to the screw, the product's anti-rotational torque mainly relies on the meshing of "D" and "D". Even if the riveting tolerance of the eccentric washer and the screw exceeds the requirements, the eccentric washer and the screw will not rotate relative to each other after installation and long-term use. The product performance is stable, which increases the product's anti-rotational torque. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of this utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram showing the appearance after removing the eccentric shim;

[0020] Figure 3 yes Figure 1 A schematic diagram of the appearance of the eccentric gasket.

[0021] In the picture:

[0022] 11. Screw; 12. Head; 13. Eccentric washer; 14. Adaptor; 15. Arc groove; 16. Gradient groove; 17. Pointing groove. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Reference Figures 1-3 According to an embodiment of the present invention, an eccentric bolt includes a screw 11 and a head 12 connected to each other, and also includes an eccentric washer 13. The eccentric washer 13 has a D-shaped through hole. The screw 11 has an integrally formed fitting part 14 near the root of the head 12 that matches the shape of the through hole. The cross-section of the fitting part 14 is also D-shaped. During assembly, the eccentric washer 13 can be snapped into the fitting part 14 by a riveting process. At this time, the eccentric washer 13 is attached to the head 12 and fixed to the screw 11, and the axis of the eccentric washer 13 is not collinear with the axis of the screw 11 to form an eccentric shape.

[0028] When the eccentric washer 13 is inserted into the adapter 14, the anti-rotation torque between the eccentric washer 13 and the screw 11 mainly relies on the engagement of "D" and "D", so that the anti-rotation torque of the product reaches 200N / m. In order to further increase friction and prevent the eccentric washer 13 from rotating relative to the screw 11, the curved surface in the adapter 14 is machined into a tooth profile by gear hobbing.

[0029] In addition, an arc-shaped groove 15 is machined in the threaded surface of the screw 11. The arc-shaped groove 15 extends downward through the screw 11. A gradually extending groove 16 is provided at the upper end of the arc-shaped groove 15. The groove depth of the gradually extending groove 16 gradually decreases in the upward direction.

[0030] Furthermore, the arc-shaped groove 15 and the tapered groove 16 are aligned with the planar area in the adapter 14, so that the threads on the screw 11 are not damaged when the adapter 14 is riveted and positioned.

[0031] The outer edge of the upper side of the eccentric washer 13 is provided with a plurality of guide grooves 17 pointing to the axis of the eccentric washer 13. The guide grooves 17 are arranged at equal angles and there is an odd number of guide grooves 17. The length of the guide groove 17 located in the middle is greater than the length of the other guide grooves 17. The guide groove 17 located in the middle points to the axis of the screw 11 and the eccentric washer 13, so that the operator can observe the position of the screw 11 covered by the eccentric washer 13 through the guide grooves 17.

[0032] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. An eccentric bolt, comprising a threaded rod (11) and a head (12) connected to each other, characterized in that: It also includes an eccentric washer (13), which has a "D"-shaped through hole. The screw (11) has an integrally formed adapter (14) at the root near the head (12) that matches the shape of the through hole. The cross section of the adapter (14) is also "D". The eccentric washer (13) is locked at the adapter (14) through the through hole so that the axis of the eccentric washer (13) is not collinear with the axis of the screw (11).

2. An eccentric bolt according to claim 1, characterized in that: The screw (11) has an arc-shaped groove (15) machined in the threaded surface, and the arc-shaped groove (15) extends downward through the screw (11).

3. An eccentric bolt according to claim 2, characterized in that: The upper end of the arc-shaped groove (15) is provided with a gradual groove (16), and the depth of the gradual groove (16) gradually decreases in the upward direction.

4. An eccentric bolt according to claim 3, characterized in that: The arc-shaped groove (15) and the gradual groove (16) are directly opposite the planar area in the adapter (14).

5. An eccentric bolt according to claim 1, characterized in that: The curved surface in the adapter (14) is machined into a tooth profile by gear hobbing.

6. An eccentric bolt according to claim 1, characterized in that: The outer edge of the upper side of the eccentric gasket (13) is provided with a plurality of pointing grooves (17) pointing to the axis of the eccentric gasket (13).

7. An eccentric bolt according to claim 6, characterized in that: The pointing grooves (17) are arranged at equal angles, and there is an odd number of pointing grooves (17). The length of the middle pointing groove (17) is greater than the length of the other pointing grooves (17), and the middle pointing groove (17) points to the axis of the screw (11) and the eccentric washer (13).

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