Input shaft adjusting structure of drive axle

Abstract

The utility model discloses a drive axle input shaft adjusting structure which comprises a drive axle housing, a vertical through hole is formed in the middle of a bottom plate of the drive axle housing, and the left end and the right end of an inner cavity of the drive axle housing extend out of the left end face and the right end face of the drive axle housing. The left end face and the right end face of the drive axle housing are fixedly connected with bearing seat flanges through bolts, and the differential assembly is located in an inner cavity of the drive axle housing. During adjustment, only the adjusting bolt needs to be detached, the bearing sleeve body seat and the input shaft can move downwards to extend out of the bottom plate of the axle housing of the drive axle, then the top face of the radial extending edge of the bearing sleeve body seat is sleeved with the gasket, the screw part of the adjusting bolt is inserted into the edge connecting through hole of the corresponding gasket in a sleeved mode, then installation is conducted, and adjustment can be achieved. Components such as an input shaft can be detached for height adjustment and installation without detaching components such as a differential assembly, and installation, detachment and adjustment are convenient.

Description

Technical Field:

[0001] The utility model relates to the technical field of drive axles, and more specifically to an input shaft adjustment structure of a drive axle. Background Art:

[0002] As one of the main drive systems of forklifts, drive axles are applied to various types of forklifts.

[0003] In the existing drive axle, a differential assembly is installed in the drive axle housing. As Figure 1 shown, a lower part thereof is provided with an input shaft 1a. A bevel gear at the top of the input shaft 1a meshes with a spiral bevel gear 2a of the differential assembly. The power is input to the spiral bevel gear 2a through the input shaft 1a, and then is output by rotating two side gear of the differential assembly. For the bevel gear to mesh and cooperate with the spiral bevel gear 2a, it is necessary to adjust the relationship between the two, and it is necessary to ensure that the root cone line and the pitch cone line of the bevel gear and the spiral bevel gear 2a both extend and have a coincidence point, and this coincidence point is basically on the central axis of the cross shaft of the differential assembly. When adjusted to this position, the noise of the gear transmission is basically the smallest. Therefore, it is necessary to adjust the height position of the input shaft 1a to achieve the most ideal adjustment;

[0004] The existing adjustment method is to add a washer 3a between the bottom surface of the bearing on the outer side wall of the upper part of the input shaft 1a and the top surface of the radial annular part formed on the inner side wall of the through hole in the middle of the bottom plate of the drive axle housing to change the height of the input shaft 1a. As Figure 1 shown, during adjustment, it is necessary to disassemble the side bearing connection flange on one side of the drive axle housing, disassemble the differential assembly, then lift the input shaft 1a and the bearing thereon upward and take them out from the through hole in the middle of the bottom plate of the drive axle housing, then put on the washer 3a, and then install it. The installation and disassembly are troublesome, the adjustment efficiency is low, and the adjustment is cumbersome. Summary of the Utility Model:

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an input shaft adjustment structure of a drive axle. During adjustment, only the adjustment bolt needs to be disassembled, then the bearing sleeve seat together with the input shaft can be moved downward and extended out of the bottom plate of the drive axle housing, then a washer is put on the top surface of the radial extension edge of the bearing sleeve seat, the screw part of the adjustment bolt is inserted into the edge connection through hole of the corresponding washer, and then installation is carried out, and adjustment can be achieved. It is not necessary to disassemble components such as the differential assembly to disassemble components such as the input shaft for height adjustment and installation, and the installation, disassembly and adjustment are convenient.

[0006] The solution of the utility model to solve the above technical problems is:

[0007] An input shaft adjustment structure of a drive axle, including a drive axle housing. A vertical through hole is formed in the middle of the bottom plate of the drive axle housing. The left end and the right end of the inner cavity of the drive axle housing extend out of the left end face and the right end face of the drive axle housing respectively. The left end face and the right end face of the drive axle housing are fixedly connected with bearing seat flanges through bolts. A differential assembly is located in the inner cavity of the drive axle housing. The outer ends of the two half axle gears of the differential assembly are movably connected to the inner side wall of the middle through hole of the corresponding bearing seat flange through bearings;

[0008] A bearing sleeve body seat is inserted in the vertical through hole. The outer side wall of the bearing sleeve body seat is closely attached to the inner side wall of the vertical through hole. A radially extending edge is formed on the outer side wall at the bottom end of the bearing sleeve body seat. The radially extending edge is located directly below the bottom plate of the drive axle housing. The radially extending edge is fixedly connected to the bottom plate of the drive axle housing through a plurality of adjusting bolts;

[0009] An input shaft is inserted in the middle through hole of the bearing sleeve body seat. The outer side wall of the input shaft is movably connected to the inner side wall of the middle through hole of the bearing sleeve body seat through a bearing. The top of the input shaft extends into the inner cavity of the drive axle housing and is formed with a transmission bevel gear portion. The tooth portion at the lower part of the spiral bevel gear on the differential assembly meshes with the transmission bevel gear portion.

[0010] An input shaft end cover is pressed against the bottom surface of the radially extending edge. A plurality of through holes are formed in the edge of the input shaft end cover, which correspond to the through holes formed on the radially extending edge. The screw portion of the adjusting bolt is inserted in the corresponding through holes in the edge of the input shaft end cover and the through holes of the radially extending edge. The top end of the screw portion of the adjusting bolt is screwed in the screw hole formed on the bottom surface of the bottom plate of the drive axle housing.

[0011] An adjusting washer is inserted on the screw portion of the adjusting bolt. The adjusting washer is clamped between the bottom surface of the bottom plate of the drive axle housing and the top surface of the radially extending edge.

[0012] A middle jack hole extending upward is formed in the middle of the bottom surface of the input shaft. An internal spline groove is formed on the inner side wall of the middle jack hole. A connecting shaft is inserted in the middle jack hole. A spline protrusion is formed on the outer side wall of the connecting shaft, which is inserted in the internal spline groove and matched with it. The bottom end of the connecting shaft extends out of the bottom end of the input shaft and is formed with a flange connecting portion.

[0013] The outstanding effect of the utility model is:

[0014] When adjusting, only need to remove the adjusting bolts, then the bearing sleeve body seat together with the input shaft can be moved downward to extend out of the bottom plate of the drive axle housing. Then put a washer on the top surface of the radially extending edge of the bearing sleeve body seat. The screw portion of the adjusting bolt is inserted in the connecting through holes at the edge of the corresponding washer, and then install it, then the adjustment can be realized. It can disassemble components such as the input shaft for height adjustment and installation without disassembling components such as the differential assembly. Its installation, disassembly and adjustment are convenient. Description of the Drawings:

[0015] Figure 1 It is a schematic diagram of a partial structure between an existing drive axle housing and an input shaft;

[0016] Figure 2 It is a schematic diagram of a partial structure of the present utility model;

[0017] Figure 3 It is Figure 2 a partial enlarged view of Detailed Description of the Preferred Embodiment:

[0018] In an embodiment, as shown in Figure 2 and Figure 3 An input shaft adjusting structure of a drive axle includes a drive axle housing 10. A vertical through hole 11 is formed in the middle of the bottom plate of the drive axle housing 10. The left end and the right end of the inner cavity of the drive axle housing 10 extend out of the left end face and the right end face of the drive axle housing 10. The left end face and the right end face of the drive axle housing 10 are fixedly connected to bearing seat flanges 20 through a plurality of bolts. An annular groove is formed on the inner end face at the outer side of the middle through hole of the bearing seat flange 20. A third sealing ring is nested in the annular groove, and the inner end face of the third sealing ring presses against the left end face or the right end face of the drive axle housing 10.

[0019] A positioning through hole is formed at the edge of the bearing seat flange 20, which is aligned and communicated with a side positioning hole formed on the left end face or the right end face of the drive axle housing 10. A positioning pin is clamped in the corresponding positioning through hole and side positioning hole.

[0020] A differential assembly 30 is located in the inner cavity of the drive axle housing 10. The outer side walls of the outer ends of the two half axle gears 31 of the differential assembly 30 are movably connected to the inner side walls of the middle through holes of the corresponding bearing seat flanges 20 through bearings. The structure of the differential assembly 30 is basically the same as that of a limited slip differential with Chinese Patent Publication No. CN206268402U, which is a well-known structure and will not be described in detail herein.

[0021] A bearing sleeve seat 40 is inserted into the vertical through hole 11. The outer side wall of the bearing sleeve seat 40 is in close contact with the inner side wall of the vertical through hole 11. A radially extending edge 41 is formed on the outer side wall of the bottom end of the bearing sleeve seat 40. The radially extending edge 41 is located directly below the bottom plate of the drive axle housing 10. The radially extending edge 41 is fixedly connected to the bottom plate of the drive axle housing 10 through a plurality of adjusting bolts 42.

[0022] An input shaft 50 is inserted into the central through hole of the bearing sleeve seat 40. The upper and middle parts of the outer side wall of the input shaft 50 are movably connected to the inner side wall of the central through hole of the bearing sleeve seat 40 through bearings. The top of the input shaft 50 extends into the inner cavity of the driving axle housing 10 and is formed with a transmission bevel gear portion. The tooth portion at the lower part of the spiral bevel gear 32 on the differential assembly 30 meshes with the transmission bevel gear portion.

[0023] Furthermore, an input shaft end cover 60 is pressed against the bottom surface of the radially extending edge 41. Multiple through holes are formed on the edge of the input shaft end cover 60, which correspond to the through holes formed on the radially extending edge 41. The screw portion of the adjusting bolt 42 is inserted into the corresponding through holes on the edge of the input shaft end cover 60 and the through holes of the radially extending edge 41. The top end of the screw portion of the adjusting bolt 42 is screwed into the screw hole formed on the bottom surface of the bottom plate of the driving axle housing 10. A spring washer is inserted into the lower part of the screw portion of the adjusting bolt 42, and the spring washer is clamped between the bottom surface of the edge of the input shaft end cover 60 and the top surface of the rotating portion of the adjusting bolt 42.

[0024] Furthermore, an adjusting washer 43 is placed on the top surface of the radially extending edge 41. Multiple connecting through holes are formed on the adjusting washer 43. The screw portion of the adjusting bolt 42 is inserted into the corresponding connecting through holes of the adjusting washer 43. The adjusting washer 43 is clamped between the bottom surface of the bottom plate of the driving axle housing 10 and the top surface of the radially extending edge 41.

[0025] Furthermore, a central jack hole extending upward is formed in the middle of the bottom surface of the input shaft 50. An internal spline groove is formed on the inner side wall of the central jack hole. A connecting shaft 51 is inserted into the central jack hole. A spline protrusion is formed on the outer side wall of the connecting shaft 51, which is inserted into and cooperates with the internal spline groove. The bottom end of the connecting shaft 51 extends out of the bottom end of the input shaft 50 and is formed with a flange connecting portion 52.

[0026] Furthermore, an annular groove is formed in the lower part of the outer side wall of the bearing sleeve seat 40. The first sealing ring is nested in the annular groove, and the outer side wall of the first sealing ring is pressed against the inner side wall of the vertical through hole 11. An annular groove is formed on the top surface of the edge of the input shaft end cover 60. The second sealing ring is nested in the annular groove, and the top surface of the second sealing ring is pressed against the bottom surface of the radially extending edge 41. The first sealing ring improves the sealing performance between the bearing sleeve seat 40 and the vertical through hole 11, and the second sealing ring improves the sealing performance between the radially extending edge 41 and the input shaft end cover 60.

[0027] Furthermore, a stepped through-hole extending downward is formed in the middle of the top surface of the input shaft end cover 60. The stepped through-hole includes an upper large-diameter hole section, a middle hole section, and a bottom small-diameter hole section with diameters gradually decreasing from top to bottom. The input shaft 50 is inserted into the stepped through-hole. An oil seal 1 is clamped on the inner side wall of the middle hole section. The inner side wall of the middle through-hole of the oil seal 1 is closely attached to the outer side wall of the input shaft 50. A bottom sealing ring 2 is nested in the annular groove formed on the inner side wall of the bottom small-diameter hole section. The inner side wall of the bottom sealing ring 2 is closely attached to the outer side wall of the input shaft 50.

[0028] The sealing effect between the input shaft end cover 60 and the input shaft 50 is improved by the bottom sealing ring 2 and the oil seal 1.

[0029] When in use in this embodiment, when it is necessary to adjust the height position of the input shaft 50, only the corresponding adjusting bolt 42 needs to be disassembled, and then the input shaft end cover 60, the bearing sleeve body seat 40, and the input shaft 50 thereon can be disassembled downward. Then, the adjusting washer 43 is placed on the top surface of the radially extending edge 41, and its thickness corresponds to the thickness to be increased (when the adjustment is too thick, the originally installed adjusting washer 43 can be disassembled and replaced with a thinner adjusting washer 43 for installation). Then, the screw part of the adjusting bolt 42 is inserted into the corresponding through-holes on the side of the input shaft end cover 60 and the through-holes of the radially extending edge 41. Its end extends out of the corresponding connection through-hole of the adjusting washer 43 and is screwed into the screw hole formed on the bottom surface of the bottom plate of the drive axle housing 10 to complete the installation. It can make the extension lines of the root cone line and the pitch cone line of the transmission bevel gear part and the spiral bevel gear 32 have a coincidence point G (this data is theoretical data. During the formal adjustment process, after the adjustment is completed, listen to its running noise. When the noise reaches the set requirement, it means that the adjustment is basically in place). And this coincidence point G is basically on the central axis of the cross shaft of the differential assembly 30 (there will be a certain small gap during adjustment, that is, it cannot be adjusted to a completely accurate position, but as long as the noise reaches the set requirement, it means that the adjustment is basically in place). At this time, it indicates that its position adjustment is accurate, thus ensuring the normal transmission operation between the transmission bevel gear part and the spiral bevel gear 32. Its adjustment, installation, disassembly are very convenient, greatly improving the adjustment efficiency and the adjustment effect.

Claims

1. An input shaft adjustment structure of a drive axle, comprising a drive axle housing (10), characterized in that: A vertical through hole (11) is formed in the middle of the bottom plate of the drive axle housing (10), the left end and the right end of the inner cavity of the drive axle housing (10) both extend out of the left end face and the right end face of the drive axle housing (10), the left end face and the right end face of the drive axle housing (10) are both fixedly connected with the bearing seat flange (20) by bolts, the differential assembly (30) is located in the inner cavity of the drive axle housing (10), and the outer ends of the two half-shaft gears (31) of the differential assembly (30) are movably connected to the inner side wall of the middle through hole of the corresponding bearing seat flange (20) through bearings; A bearing sleeve seat (40) is inserted into the vertical through hole (11), the outer wall of the bearing sleeve seat (40) is in close contact with the inner wall of the vertical through hole (11), and a radial extension edge (41) is formed on the outer wall of the bottom end of the bearing sleeve seat (40), the radial extension edge (41) is located directly below the bottom plate of the drive axle housing (10), and the radial extension edge (41) is fixedly connected to the bottom plate of the drive axle housing (10) by a plurality of adjustment bolts (42); An input shaft (50) is inserted into the middle through hole of the bearing sleeve seat (40); the outer wall of the input shaft (50) is movably connected to the inner wall of the middle through hole of the bearing sleeve seat (40) through a bearing; the top of the input shaft (50) extends into the inner cavity of the drive axle housing (10) and is formed with a transmission bevel gear portion; the lower tooth portion of the spiral bevel gear (32) on the differential assembly (30) meshes with the transmission bevel gear portion.

2. The input shaft adjustment structure of a drive axle according to claim 1, characterized in that: The bottom surface of the radially extending edge (41) is pressed against an input shaft end cover (60), and a plurality of through holes are formed on the edge of the input shaft end cover (60), which correspond to the through holes formed on the radially extending edge (41). The screw portion of the adjusting bolt (42) is inserted into the corresponding through holes on the edge of the input shaft end cover (60) and the through holes on the radially extending edge (41). The top end of the screw portion of the adjusting bolt (42) is screwed into a screw hole formed on the bottom surface of the bottom plate of the drive axle housing (10). The lower part of the screw portion of the adjusting bolt (42) is inserted with a spring washer, which is clamped between the bottom surface of the edge of the input shaft end cover (60) and the top surface of the rotating portion of the adjusting bolt (42).

3. The input shaft adjustment structure of a drive axle according to claim 2, characterized in that: An adjusting washer (43) is inserted and sleeved on the screw rod portion of the adjusting bolt (42), and the adjusting washer (43) is clamped between the bottom surface of the bottom plate of the drive axle housing (10) and the top surface of the radially extending edge (41).

4. The input shaft adjustment structure of a drive axle according to claim 1, characterized in that: The input shaft (50) is provided with a central plug hole extending upward in the middle of the bottom surface, and an inner spline groove is formed on the inner side wall of the central plug hole. The connecting shaft (51) is inserted into the central plug hole, and a spline protrusion is formed on the outer side wall of the connecting shaft (51), which is inserted into and matched with the inner spline groove. The bottom end of the connecting shaft (51) extends out of the bottom end of the input shaft (50) and is formed with a flange connection portion (52).

5. The input shaft adjustment structure of a drive axle according to claim 1, characterized in that: An annular groove is formed at the lower part of the outer side wall of the bearing sleeve seat (40), the first sealing ring is nested in the annular groove, and the outer side wall of the first sealing ring is pressed against the inner side wall of the vertical through hole (11).

6. The input shaft adjustment structure of a drive axle according to claim 2, characterized in that: An annular groove is formed on the top surface of the edge of the input shaft end cover (60), and the second sealing ring is nested in the annular groove. The top surface of the second sealing ring is pressed against the bottom surface of the radially extending edge (41).

7. The input shaft adjustment structure of a drive axle according to claim 2, characterized in that: A stepped through hole extending downward is formed in the middle of the top surface of the input shaft end cover (60), the stepped through hole comprising an upper large-diameter hole section, a middle hole section and a bottom small-diameter hole section, the diameters of which gradually decrease from top to bottom. The input shaft (50) is inserted into the stepped through hole, an oil seal (1) is clamped on the inner side wall of the middle hole section, the inner side wall of the middle through hole of the oil seal (1) is in close contact with the outer side wall of the input shaft (50), a bottom sealing ring (2) is embedded in an annular groove formed on the inner side wall of the bottom small-diameter hole section, and the inner side wall of the bottom sealing ring (2) is in close contact with the outer side wall of the input shaft (50).

8. The input shaft adjustment structure of a drive axle according to claim 1, characterized in that: The edge of the bearing seat flange (20) is formed with a positioning through hole, which is aligned with and communicated with a side positioning hole formed on the left end face or the right end face of the drive axle housing (10), and the positioning pin is clamped in the corresponding positioning through hole and the side positioning hole.

9. The input shaft adjustment structure of a drive axle according to claim 1, characterized in that: An annular groove is formed on the inner end surface at the outer side of the central through hole of the bearing seat flange (20), and the third sealing ring is nested in the annular groove. The inner end surface of the third sealing ring is pressed against the left end surface or the right end surface of the moving bridge housing (10).

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