A limit compensation mechanism for a transmission worm gear

Abstract

The utility model relates to the technical field of automobile steering system, specifically, a limit compensation mechanism of a transmission worm wheel, comprising a drive unit housing, a transmission worm wheel, and a spring washer, a first clamping slot and a second clamping slot are respectively provided on both sides of the worm wheel installation slot of the drive unit housing, a deformation slot is provided on the side of the second clamping slot away from the worm wheel installation slot, a spring washer is installed in the first clamping slot, the thickness of the first spring washer is the same as the width of the first clamping slot, a spring washer is installed in the second clamping slot, the thickness of the second spring washer is the same as the width of the second clamping slot, the deformation of the second spring washer is less than the maximum width of the deformation slot, and the end of the rotating shaft of the transmission worm wheel is respectively against the first spring washer and the second spring washer. Compared with the prior art, the utility model limits the axial displacement of the transmission worm wheel, compensates for the interference of the assembly of the transmission worm wheel, and realizes the interference assembly of the transmission worm wheel; eliminates the moving clearance in the axial direction of the transmission worm wheel, and improves the transmission efficiency, the reliability of the electric adjustment column drive unit and the NVH level.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile steering systems, in particular to a limit compensation mechanism for a transmission worm wheel. Background Art

[0002] The drive unit of the electric adjustment column has the functions of speed conversion and torque transmission. During the torque transmission process, when the torque transmission direction is changed, the transmission worm gear will be subjected to the axial force component and axial displacement will occur, which will affect the transmission efficiency of the transmission worm gear and produce abnormal impact noise, affecting the NVH performance of the electric adjustment column.

[0003] Therefore, it is necessary to design a limit compensation mechanism for the transmission worm gear to limit the axial displacement of the transmission worm gear and realize interference assembly of the transmission worm gear. Summary of the invention

[0004] The utility model aims to overcome the deficiencies of the prior art and provides a limit compensation mechanism for a transmission worm wheel to limit the axial displacement of the transmission worm wheel and realize interference assembly of the transmission worm wheel.

[0005] In order to achieve the above-mentioned purpose, the utility model is a limit compensation mechanism for a transmission worm gear, comprising a driving unit housing, a transmission worm gear, and a spring gasket. A worm gear mounting groove is provided inside the driving unit housing, and a clamping groove one and a clamping groove two are respectively provided on both sides of the worm gear mounting groove. A deformation groove is provided on the side of the clamping groove two away from the worm gear mounting groove. A U-shaped groove is respectively provided between the worm gear mounting groove and the clamping groove one, and between the worm gear mounting groove and the clamping groove two. Spring gasket one is installed in clamping groove one, and the thickness of spring gasket one is the same as the width of clamping groove one. Spring gasket two is installed in clamping groove two, and the thickness of spring gasket two is the same as the width of clamping groove two. The deformation of spring gasket two is less than the maximum width of the deformation groove. The transmission worm gear is located in the worm gear mounting groove, and both ends of the rotating shaft of the transmission worm gear are located in the corresponding U-shaped grooves. The end of the rotating shaft of the transmission worm gear abuts against spring gasket one, and the other end of the rotating shaft of the transmission worm gear abuts against spring gasket two.

[0006] The transmission worm wheel comprises a plastic tooth shape and a metal rotating shaft.

[0007] The spring washer 1 and the spring washer 2 are metal sheet structures.

[0008] The rotating shaft of the transmission worm wheel and the first spring washer, as well as the rotating shaft of the transmission worm wheel and the second spring washer are interference fit.

[0009] The two U-shaped grooves are respectively connected to the worm gear installation groove and the first clamping groove, and the worm gear installation groove and the second clamping groove.

[0010] Compared with the prior art, the utility model limits the axial displacement of the transmission worm gear and compensates for the interference fit of the transmission worm gear through the arrangement of the card slot and the deformation slot in cooperation with the spring gasket, thereby realizing interference fit of the transmission worm gear; eliminates the movement clearance in the axial direction of the transmission worm gear, improves the transmission efficiency, and avoids the abnormal noise caused by the impact between the transmission worm gear and the limit, thereby improving the reliability and NVH level of the electric adjustment column drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an exploded view of the utility model.

[0012] Figure 2 It is a top view of the utility model. DETAILED DESCRIPTION

[0013] The utility model is now further described with reference to the accompanying drawings.

[0014] See also Figure 1 , Figure 2 The utility model is a limit compensation mechanism for a transmission worm gear, comprising a driving unit housing, a transmission worm gear, and a spring gasket. A worm gear mounting groove 11 is provided inside the driving unit housing 1, and a first clamping groove 12 and a second clamping groove 14 are respectively provided on both sides of the worm gear mounting groove 11. A deformation groove 13 is provided on the side of the second clamping groove 14 away from the worm gear mounting groove 11. A U-shaped groove 15 is respectively provided between the worm gear mounting groove 11 and the first clamping groove 12, and between the worm gear mounting groove 11 and the second clamping groove 14. The two U-shaped grooves 15 respectively connect the worm gear mounting groove 11 and the first clamping groove 12, and the worm gear mounting groove 11 and the second clamping groove 14.

[0015] Spring gasket 12 is installed in slot 12, and the thickness of spring gasket 12 is the same as the width of slot 12. Spring gasket 23 is installed in slot 214, and the thickness of spring gasket 23 is the same as the width of slot 214. The deformation of spring gasket 23 is less than the maximum width of deformation groove 13, and the maximum width of deformation groove 13 provides deformation space for spring gasket 23.

[0016] The transmission worm wheel 4 is located in the worm wheel installation groove 11, and both ends of the rotating shaft of the transmission worm wheel 4 are located in the corresponding U-shaped grooves 15. The rotating shaft end of the transmission worm wheel 4 abuts against the spring washer 1 2, and the other end of the rotating shaft of the transmission worm wheel 4 abuts against the spring washer 2 3.

[0017] In the utility model, the transmission worm wheel 4 comprises a plastic tooth shape and a metal shaft. The spring washer 1 2 and the spring washer 2 3 are metal sheet structures.

[0018] When the utility model is working, the rotating shaft of the transmission worm wheel 4 and the spring washer 1 2, the rotating shaft of the transmission worm wheel 4 and the spring washer 2 3 are in interference fit. The spring washer 1 2 and the rotating shaft of the transmission worm wheel 4 are in rigid contact, the spring washer 2 3 bears the static load from the rotating shaft of the transmission worm wheel 4 in the axial direction, the spring washer 2 3 is deformed after being squeezed, and the deformed spring washer 2 3 extends in the width direction of the deformation groove 13, and the spring washer 2 3 forms a continuous and stable pre-tightening force on the transmission worm wheel 4, and the pre-tightening force is greater than the axial force component of the transmission worm wheel 4 when the torque transmission direction of the driving unit is converted. When the torque transmission direction of the driving unit is converted, the pre-tightening force can offset the axial force component of the transmission worm wheel 4, so that the axial displacement of the transmission worm wheel 4 can be limited. At the same time, the deformation amount of the spring washer 2 3 can compensate for the assembly interference between the central rotating shaft of the transmission worm wheel 4 and the spring washer 1 2 and the spring washer 2 3, thereby realizing the interference assembly of the transmission worm wheel.

[0019] The utility model limits the axial displacement of the transmission worm gear and compensates for the interference fit of the transmission worm gear through the arrangement of the card slot and the deformation slot in cooperation with the spring gasket, thereby achieving interference fit of the transmission worm gear; eliminates the movement clearance in the axial direction of the transmission worm gear, improves the transmission efficiency, and avoids the abnormal noise caused by the impact between the transmission worm gear and the limit, thereby improving the reliability and NVH level of the electric adjustment column drive unit.

Claims

1. A limit compensation mechanism for a transmission worm gear, comprising a drive unit housing, a transmission worm gear, and a spring washer, characterized in that: A worm gear mounting groove (11) is provided inside the driving unit housing (1), a first clamping groove (12) and a second clamping groove (14) are provided on both sides of the worm gear mounting groove (11), a deformation groove (13) is provided on the side of the second clamping groove (14) away from the worm gear mounting groove (11), a U-shaped groove (15) is provided between the worm gear mounting groove (11) and the first clamping groove (12), and between the worm gear mounting groove (11) and the second clamping groove (14), respectively, a spring washer (2) is installed in the first clamping groove (12), and the thickness of the spring washer (2) is the same as that of the first clamping groove (12). The second spring gasket (3) is installed in the second card slot (14), the thickness of the second spring gasket (3) is the same as the width of the second card slot (14), the deformation of the second spring gasket (3) is less than the maximum width of the deformation slot (13), the transmission worm gear (4) is located in the worm gear installation slot (11), the two ends of the rotating shaft of the transmission worm gear (4) are located in the corresponding U-shaped slots (15), the end of the rotating shaft of the transmission worm gear (4) abuts against the first spring gasket (2), and the other end of the rotating shaft of the transmission worm gear (4) abuts against the second spring gasket (3).

2. The limit compensation mechanism of the transmission worm gear according to claim 1, characterized in that: The transmission worm wheel (4) comprises a plastic tooth shape and a metal rotating shaft.

3. The limit compensation mechanism of a transmission worm gear according to claim 1, characterized in that: The spring washer 1 (2) and the spring washer 2 (3) are metal sheet structures.

4. The limit compensation mechanism of the transmission worm gear according to claim 1, characterized in that: The rotating shaft of the transmission worm wheel (4) and the spring washer 1 (2), as well as the rotating shaft of the transmission worm wheel (4) and the spring washer 2 (3) are interference fit.

5. The limit compensation mechanism of the transmission worm gear according to claim 1, characterized in that: The two U-shaped grooves (15) respectively connect the worm gear installation groove (11) and the first clamping groove (12), and the worm gear installation groove (11) and the second clamping groove (14).

Images