A drive shaft fixing structure that facilitates control of installation clearance

Abstract

This invention relates to a drive shaft fixing structure that facilitates control of installation clearance, belonging to the field of mechanical transmission. The invention includes: a drive shaft (1), a spring (2), a pin (3), and a retaining ring (4); the drive shaft (1) is fixed to a housing; one end of the drive shaft (1) has an external thread on its side wall, and a cylindrical eccentric hole is formed inward along the axial direction on the end face of this side. The eccentric hole contains a spring (2) and a pin (3), with the spring (2) positioned inside the eccentric hole; the retaining ring (4) is a cylindrical structure with axial holes formed inward at both ends, one end being a circular hole with a diameter of D2, and the other end being an internally threaded hole. Three arc-shaped grooves are formed on the circumference of the circular hole facing the internally threaded hole. The retaining ring (4) is threadedly connected to the end of the drive shaft (1), achieving control of the fit clearance and preventing loosening of the threaded connection structure. Furthermore, the clearance is not affected by the manufacturing tolerances of the parts, and adjustment is convenient.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission, and specifically relates to a transmission shaft fixing structure that facilitates control of installation clearance. Background Technology

[0002] Existing drive shafts, after assembly, must ensure flexible rotation, accurate positioning, and convenient assembly and disassembly. Therefore, it is necessary to guarantee the axial clearance between the drive shaft and other parts. Traditional drive shaft fixing methods generally use threaded connections, shaft end retaining rings, shaft end baffles, elastic retaining rings, etc. The clearance during installation is affected by the manufacturing tolerances of the parts, making it difficult to control and impossible to adjust. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The technical problem to be solved by the present invention is how to provide a drive shaft fixing structure that facilitates control of the installation gap, so as to solve the problem that traditional drive shaft fixing structures are not convenient for controlling the installation gap.

[0005] (II) Technical Solution

[0006] To solve the above-mentioned technical problems, the present invention proposes a drive shaft fixing structure that facilitates control of installation gap, comprising: drive shaft 1, spring 2, pin 3, and retaining ring 4;

[0007] The drive shaft 1 is fixed to the housing;

[0008] The drive shaft 1 is configured as a stepped column structure. One end of the drive shaft 1 has an external thread on its side wall. A cylindrical eccentric hole is opened inward along the axial direction on the side end face. A spring 2 and a pin 3 are provided in the eccentric hole. The spring 2 is located inside the eccentric hole.

[0009] The retaining ring 4 is a cylindrical structure with holes axially opened inward at the center of both ends. One end is a circular hole with a diameter of D2, and the other end is an internally threaded hole. Three arc-shaped grooves are opened in the circumferential direction of the circular hole facing the end of the internally threaded hole. The retaining ring 4 is threadedly connected to the end of the transmission shaft 1.

[0010] The diameter of the eccentric hole of the drive shaft 1 is set to D1, and the eccentricity between the axis of the eccentric hole and the axis of the drive shaft 1 is set to E.

[0011] The pin 3 has two cylindrical sections with different diameters, referred to as the large cylinder and the small cylinder respectively. The outer diameter of the large cylinder is the same as the diameter of the eccentric hole at the end of the transmission shaft 1, and the outer diameter of the small cylinder is set to D3.

[0012] The relationship between the three values ​​D2, D3, and E satisfies formula (1):

[0013] 2×E+D3<D2 (1)

[0014] Place the spring 2 and pin 3 into the eccentric hole at the end of the drive shaft 1, and press the pin 3 down until the transition surface between its large and small cylinders is flush with the end face of the drive shaft 1. Install the retaining ring 4 onto the drive shaft 1 and screw it until the end face of the retaining ring 4 fits against the housing. Rotate the retaining ring 4 in the opposite direction until its arc groove is aligned with the pin 3. Release the pressed-down pin 3 so that the large cylindrical surface of the pin 3 is stuck in the arc groove of the retaining ring 4.

[0015] The spring 2 is a helical compression spring, and its outer diameter is smaller than the eccentric hole at the end of the transmission shaft 1.

[0016] The eccentricity between the axis of the eccentric hole of the transmission shaft 1 and the axis of the transmission shaft 1 can be adjusted according to the diameter of the transmission shaft.

[0017] By selecting different arc-shaped grooves, the gap between the retaining ring 4 and the housing can be controlled within different ranges, while preventing mutual rotation between the retaining ring 4 and the drive shaft 1.

[0018] The lead of the connecting thread of the drive shaft 1 is set to 1.5mm. When the pin 3 is stuck in the first arc groove of the retaining ring 4, the gap between the retaining ring 4 and the housing is between 0mm and 0.5mm.

[0019] When pin 3 is engaged in the second arc-shaped groove of retaining ring 4, the gap between retaining ring 4 and housing is between 0.5mm and 1mm.

[0020] The outer side of the retaining ring 4 is provided with a knurled cylindrical surface.

[0021] (III) Beneficial Effects

[0022] This invention proposes a drive shaft fixing structure that facilitates control of installation clearance, simultaneously controlling the mating clearance and preventing loosening of the threaded connection structure. Moreover, the clearance is not affected by the manufacturing tolerances of the parts and is easy to adjust. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the installation of the present invention;

[0024] Figure 2 This is a structural diagram of the drive shaft end of the present invention;

[0025] Figure 3 This is a structural diagram of the retaining ring. Detailed Implementation

[0026] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0027] This embodiment provides a drive shaft fixing structure that facilitates control of installation clearance, including: drive shaft 1, spring 2, pin 3, and retaining ring 4;

[0028] The drive shaft 1 is fixed to the housing;

[0029] The drive shaft 1 is configured as a stepped column structure. The drive shaft 1 has an external thread on its end side wall. A cylindrical eccentric hole is opened inward along the axial direction on the end face. A spring 2 and a pin 3 are provided in the eccentric hole. The spring 2 is located inside the eccentric hole.

[0030] The retaining ring 4 is a cylindrical structure with holes axially opened inward at the center of both ends. One end is a circular hole with a diameter of D2, and the other end is an internally threaded hole. Three arc-shaped grooves are opened in the circumferential direction of the circular hole facing the end of the internally threaded hole. The retaining ring 4 is threadedly connected to the end of the transmission shaft 1.

[0031] The diameter of the eccentric hole of the drive shaft 1 is set to D1, and the eccentricity between the axis of the eccentric hole and the axis of the drive shaft 1 is set to E.

[0032] The pin 3 has two cylindrical sections with different diameters, referred to as the large cylinder and the small cylinder respectively. The outer diameter of the large cylinder is the same as the diameter of the eccentric hole at the end of the transmission shaft 1, and the outer diameter of the small cylinder is set to D3.

[0033] The relationship between the three values ​​D2, D3, and E satisfies formula (1):

[0034] 2×E+D3<D2 (1)

[0035] Place the spring 2 and pin 3 into the eccentric hole at the end of the drive shaft 1, and press the pin 3 down until the transition surface between its large and small cylinders is flush with the end face of the drive shaft 1. Install the retaining ring 4 onto the drive shaft 1 and screw it until the end face of the retaining ring 4 fits against the housing. Rotate the retaining ring 4 in the opposite direction until its arc groove is aligned with the pin 3. Release the pressed-down pin 3 so that the large cylindrical surface of the pin 3 is stuck in the arc groove of the retaining ring 4.

[0036] The spring 2 is a helical compression spring, and its outer diameter is smaller than the eccentric hole at the end of the transmission shaft 1.

[0037] The eccentricity between the axis of the eccentric hole of the transmission shaft 1 and the axis of the transmission shaft 1 can be adjusted according to the diameter of the transmission shaft.

[0038] By selecting different arc-shaped grooves, the gap between the retaining ring 4 and the housing can be controlled within different ranges, while preventing mutual rotation between the retaining ring 4 and the drive shaft 1.

[0039] The lead of the connecting thread of the drive shaft 1 is set to 1.5mm. When the pin 3 is stuck in the first arc groove of the retaining ring 4, the gap between the retaining ring 4 and the housing is between 0mm and 0.5mm.

[0040] When pin 3 is engaged in the second arc-shaped groove of retaining ring 4, the gap between retaining ring 4 and housing is between 0.5mm and 1mm.

[0041] The outer side of the retaining ring 4 is provided with a knurled cylindrical surface.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A drive shaft fixing structure that facilitates control of installation clearance, characterized in that, include: Drive shaft (1), spring (2), pin (3), retaining ring (4); The drive shaft (1) is fixed on the housing; The drive shaft (1) is configured as a stepped column structure. One end of the drive shaft (1) has an external thread on its side wall. A cylindrical eccentric hole is opened inward along the axial direction on the side end face. A spring (2) and a pin (3) are provided in the eccentric hole. The spring (2) is located inside the eccentric hole. The retaining ring (4) is a cylindrical structure with holes at both ends of the center opening inward along the axial direction. One end is a circular hole with a diameter of D2, and the other end is an internal thread hole. The circular hole has three arc-shaped grooves on the circumference of the end facing the internal thread hole. The retaining ring (4) is threaded to the end of the transmission shaft (1). The diameter of the eccentric hole of the transmission shaft (1) is set to D1, and the eccentricity between the axis of the eccentric hole and the axis of the transmission shaft (1) is set to E; The pin (3) has two cylinders with different diameters at the front and back, referred to as the large cylinder and the small cylinder respectively. The outer diameter of the large cylinder is the same as the diameter of the eccentric hole at the end of the transmission shaft (1), and the outer diameter of the small cylinder is set to D3. The relationship between the three values ​​D2, D3, and E satisfies formula (1): 2×E+D3<D2 (1) Place the spring (2) and pin (3) in the eccentric hole at the end of the drive shaft (1), and press the pin (3) down until the transition surface between its large cylinder and small cylinder is flush with the end face of the drive shaft (1). Install the retaining ring (4) on the drive shaft (1) and rotate it until the end face of the retaining ring (4) fits against the housing. Rotate the retaining ring (4) in the opposite direction until its arc groove is aligned with the pin (3). Release the pressed-down pin (3) so that the large cylindrical surface of the pin (3) is stuck in the arc groove of the retaining ring (4).

2. The drive shaft fixing structure for easy control of installation clearance as described in claim 1, characterized in that, The spring (2) is a helical compression spring, and its outer diameter is smaller than the eccentric hole at the end of the transmission shaft (1).

3. The drive shaft fixing structure for easy control of installation clearance as described in claim 1, characterized in that, The eccentricity between the axis of the eccentric hole of the drive shaft (1) and the axis of the drive shaft (1) can be adjusted according to the diameter of the drive shaft.

4. The drive shaft fixing structure as described in claim 1, which facilitates control of installation clearance, is characterized in that... By selecting different arc grooves, the gap between the retaining ring (4) and the housing can be controlled within different ranges, while preventing mutual rotation between the retaining ring (4) and the transmission shaft (1).

5. The drive shaft fixing structure as described in claim 4, which facilitates control of the installation gap, is characterized in that... The lead of the connecting thread of the drive shaft (1) is set to 1.5mm. When the pin (3) is stuck in the first arc groove of the retaining ring (4), the gap between the retaining ring (4) and the housing is between 0mm and 0.5mm. When the pin (3) is stuck in the second arc groove of the retaining ring (4), the gap between the retaining ring (4) and the housing is between 0.5 mm and 1 mm.

6. The drive shaft fixing structure as described in claim 1, which facilitates control of installation clearance, is characterized in that, The outer side of the retaining ring (4) is provided with a knurled cylindrical surface.

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