A backlash-eliminating combined gear

Abstract

The present invention discloses a backlash-eliminating combined gear, which includes a main gear and a sub-gear. A first sleeve is provided at the left end of the main gear. An annular groove surrounding the first sleeve is provided at the left end of the main gear. A first clamping groove communicating with the annular groove is provided on the end face of the first sleeve. A second sleeve is provided at the right end of the sub-gear. A counterbore is provided inside the second sleeve. A second clamping groove is vertically provided on the side wall of the second sleeve. A torsion spring with both ends respectively engaged with the first clamping groove and the second clamping groove is sleeved on the first sleeve. The backlash-eliminating combined gear of the present invention belongs to the technical field of gear transmission, and can eliminate the adverse factors brought by the change of tooth thickness dimension during the operation of the gear; it has the advantages of simple structure, good part processing manufacturability, good assembly manufacturability, and good maintainability.

Description

Technical Field

[0001] The present invention relates to gear transmission technology, and more specifically, it relates to a backlash-eliminating combined gear. Background Art

[0002] At present, the tooth surface of the air compressor drive gear configured for the engine is a hard tooth surface, and the gear pair is installed with a fixed-distance side clearance. During use, meshing knocking sounds will occur due to tooth surface wear. To reduce the knocking sounds, generally, a rigid shaft plus a backlash-eliminating gear, or a rigid shaft plus a soft tooth surface, or a rigid shaft plus a micro-cone gear is adopted in engineering, and the above three gear pairs are all installed with a fixed-distance side clearance. Under the condition that the gear pairs are all installed with a fixed-distance side clearance, when adopting the method of a rigid shaft plus a backlash-eliminating gear, because a rod-type elastic pressing part is used, it brings a decrease in reliability while reducing the knocking sounds; when adopting the method of a rigid shaft plus a soft tooth surface, it also has the disadvantage of a short service life; while when adopting the method of a rigid shaft plus a micro-cone gear, it is only applicable to low-speed gear pairs. To improve these disadvantages, it is required to change the side clearance state after the gear pair is installed and ensure that the adverse factors brought about by the change in tooth thickness size during gear operation can be compensated. Summary of the Invention

[0003] The technical problem to be solved by the present invention is in view of the above-mentioned deficiencies of the prior art. The purpose of the present invention is to provide a backlash-eliminating combined gear that can eliminate the adverse factors brought about by the change in tooth thickness size during gear operation.

[0004] To achieve the above purpose, the present invention provides a backlash-eliminating combined gear, including a main gear and a sub-gear. The left end of the main gear protrudes with a first sleeve. An annular groove is provided on the left end of the main gear and is arranged around the outer wall of the first sleeve. A first card slot is provided on the first sleeve. A first shaft hole is provided in the first sleeve and penetrates through the main gear. The right end of the sub-gear protrudes with a second sleeve adapted to the outer groove wall of the annular groove. A second shaft hole adapted to the outer wall of the first sleeve is provided on the sub-gear. A second card slot is vertically provided on the side wall of the second sleeve. A torsion spring with both ends respectively engaged with the first card slot and the second card slot is provided between the outer wall of the first sleeve and the inner wall of the second sleeve.

[0005] Further, a threaded through hole is provided on the main gear, and a bolt is detachably provided in the threaded through hole. A positioning hole adapted to the bolt is provided on the sub-gear.

[0006] Furthermore, a first avoidance notch coaxial with the threaded through hole is provided on the groove wall of the annular groove of the main gear. A second avoidance notch coaxial with the positioning hole is provided on the second sleeve of the sub-gear.

[0007] As a further improvement, a keyway is provided in the first shaft hole.

[0008] Further, a first boss is provided on the right end of the main gear.

[0009] Further, two first disassembly and assembly holes are symmetrically provided on the first boss.

[0010] Further, a second boss is provided on the left end of the sub-gear.

[0011] Further, two second disassembly and assembly holes are symmetrically provided on the second boss.

[0012] Further, a counterbore is provided inside the second sleeve.

[0013] Further, the first card slot is an L-shaped slot communicating with the annular groove, and the second card slot is a "-" shaped slot vertically provided on the side wall of the second sleeve.

[0014] Advantageous Effects

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] After loosening the positioning of the sub-gear relative to the main gear, the clearance-eliminating combined gear of the present invention will generate a reverse torque due to the pre-tightening torque of the torsion spring. This torque will cause the sub-gear to have a tendency to rotate relative to the main gear, thereby increasing the working tooth thickness. In this way, the backlash of the gear pair is eliminated, the meshing knocking sound is reduced, and at the same time, it has the advantages of simple structure, good machining processability of parts, good assembly processability, and good maintainability. Description of the Drawings

[0017] Figure 1 is a schematic structural view of the clearance-eliminating combined gear of the present invention;

[0018] Figure 2 is a left view of the clearance-eliminating combined gear of the present invention;

[0019] Figure 3 is Figure 1 a structural cross-sectional view in the A-A direction of

[0020] Figure 4 is Figure 1 a structural cross-sectional view in the B-B direction of

[0021] Figure 5 is Figure 1 a structural cross-sectional view in the C-C direction of

[0022] Figure 6 is Figure 2 a structural cross-sectional view in the D-D direction of

[0023] Figure 7It is a schematic structural view of the secondary gear of the backlash-eliminating combined gear of the present invention;

[0024] Figure 8 is Figure 7 a structural sectional view in the E-E direction in;

[0025] Figure 9 It is a schematic structural view of the secondary gear of the backlash-eliminating combined gear of the present invention;

[0026] Figure 10 It is a schematic structural view of the secondary gear of the backlash-eliminating combined gear of the present invention;

[0027] Figure 11 is Figure 7 a structural sectional view in the F-F direction in;

[0028] Figure 12 is Figure 9 a structural sectional view in the G-G direction in;

[0029] Figure 13 It is a schematic structural view of the primary gear of the backlash-eliminating combined gear of the present invention;

[0030] Figure 14 It is a schematic structural view of the primary gear of the backlash-eliminating combined gear of the present invention;

[0031] Figure 15 is Figure 13 a structural sectional view in the H-H direction in;

[0032] Figure 16 is Figure 13 a structural sectional view in the I-I direction in;

[0033] Figure 17 is Figure 14 a structural sectional view in the L-L direction in;

[0034] Figure 18 is Figure 14 a structural sectional view in the K-K direction in;

[0035] Figure 19 It is a schematic structural view of the primary gear of the backlash-eliminating combined gear of the present invention;

[0036] Figure 20 It is a schematic structural view of the torsion spring of the backlash-eliminating combined gear of the present invention;

[0037] In the figure: 1, main gear; 2, sub-gear; 3, first sleeve; 4, annular groove; 5, first clamping groove; 6, first shaft hole; 7, second sleeve; 8, counterbore; 9, second clamping groove; 10, second shaft hole; 11, torsion spring; 12, threaded through-hole; 13, bolt; 14, positioning hole; 15, first avoidance notch; 16, second avoidance notch; 17, keyway; 18, first boss; 19, first disassembly and assembly hole; 20, second boss; 21, second disassembly and assembly hole. Specific Embodiment

[0038] The following will describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. However, it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0039] As Figure 1 - 20 shown, a backlash-eliminating combined gear includes a main gear 1 and a sub-gear 2. A first sleeve 3 protrudes from the left end of the main gear 1. An annular groove 4 is provided on the left end of the main gear 1 and is arranged around the outer wall of the first sleeve 3. A first clamping groove 5 is provided on the first sleeve 3. A first shaft hole 6 is provided in the first sleeve 3 and penetrates through the main gear 1. A second sleeve 7 protrudes from the right end of the sub-gear 2 and is adapted to the outer side wall of the annular groove 4. A second shaft hole 10 adapted to the outer wall of the first sleeve 3 is provided on the sub-gear 2. A second clamping groove 9 is vertically provided on the side wall of the second sleeve 7. A torsion spring 11 with both ends respectively engaged with the first clamping groove 5 and the second clamping groove 9 is provided between the outer wall of the first sleeve 3 and the inner wall of the second sleeve 7.

[0040] In this embodiment, the main gear 1 is a basic assembly. In addition to having a working tooth circle of a general gear, it also has an annular groove 4 opened at one end for installing the torsion spring 11. The first clamping groove 5 opened on the first sleeve 3 is used to fix one end of the torsion spring 11. The first sleeve 3 and the first shaft hole 6 therein are used for assembling with a drive shaft and a flat key; in addition to having a working tooth circle of a general gear, the sub-gear 2 is provided with a second shaft hole 10 for cooperating with the first sleeve 3 and the outer cylindrical surface of the main gear 1. The fit property is a small clearance fit of 0.01 mm. A second clamping groove 9 is vertically provided on the side wall of the second sleeve 7 for fixing one end of the torsion spring 11.

[0041] In this embodiment, a threaded through-hole 12 is provided on the main gear 1, and a bolt 13 is detachably provided in the threaded through-hole 12. A positioning hole 14 adapted to the bolt 13 is provided on the sub-gear 2; the bolt 13 passes through the threaded through-hole 12 and the positioning hole 14 for positioning and locking the sub-gear 2 and the main gear 1. Whether the bolt 13 exists is determined according to different states of this backlash-eliminating combined gear and is removed in the use state.

[0042] In this embodiment, a first avoidance notch 15 coaxial with the threaded through hole 12 is provided on the groove wall of the annular groove 4 of the main gear 1, and a second avoidance notch 16 coaxial with the positioning hole 14 is provided on the second sleeve 7 of the auxiliary gear 2; the first avoidance notch 15 and the second avoidance notch 16 have requirements for the circumferential phase angle to avoid the bolt 13.

[0043] In this embodiment, a keyway 17 is provided in the first shaft hole 6; the keyway 17 is used for assembling with a drive shaft and a flat key.

[0044] In this embodiment, a first boss 18 is provided at the right end of the main gear 1; it is used for cooperating with a locking member for locking the drive shaft.

[0045] In this embodiment, two first disassembly and assembly holes 19 are symmetrically provided on the first boss 18; they are used for positioning disassembly and assembly tools.

[0046] In this embodiment, a second boss 20 is provided on the left end face of the auxiliary gear 2; the distance between the end face of the second boss 20 and the end face of the first sleeve 3 of the main gear 1 has strict requirements to ensure that there is a recessed amount of 0.2 mm after assembly.

[0047] In this embodiment, two second disassembly and assembly holes 21 are symmetrically provided on the second boss 20; they are used for positioning disassembly and assembly tools.

[0048] In this embodiment, a counterbore 8 is provided inside the second sleeve 7; the counterbore 8 cooperates with the annular groove 4 for installing the torsion spring 11.

[0049] In this embodiment, the first card slot 5 is an L-shaped slot communicating with the annular groove 4, and the second card slot 9 is a "one"-shaped slot vertically provided on the side wall of the second sleeve 7; the end of the L-shaped slot communicates with the annular groove 4.

[0050] Working principle:

[0051] The main gear 1 is a basic assembly. Besides having a working tooth ring of a general gear, it has an annular groove 4 opened at one end for installing a torsion spring 11. The first clamping groove 5 opened on the first sleeve 3 is used to fix one end of the torsion spring 11. The first sleeve 3 and the first shaft hole 6 therein are used for assembling with a drive shaft and a flat key. Besides having a working tooth ring of a general gear, the secondary gear 2 has a second sleeve 7 and a counterbore 8 opened at one end for installing the torsion spring 11. A second shaft hole 10 is opened in the middle of the counterbore 8 for fitting with the first sleeve 3 and the outer cylindrical surface of the main gear 1. The fitting property is a small clearance fit, and the clearance is about 0.01 mm. A second clamping groove 9 is vertically provided on the side wall of the second sleeve 7 for fixing one end of the torsion spring 11. After releasing the positioning of the secondary gear relative to the main gear, a reverse torque will be generated due to the pre-tightening torque of the torsion spring. This torque will cause the secondary gear to have a tendency to rotate relative to the main gear, thereby making the working tooth thickness tend to increase. In this way, the backlash of the gear pair is eliminated, the meshing knocking sound is reduced, and it has the advantages of simple structure, good machining processability of parts, good assembly processability, and good maintainability.

[0052] The above is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, and these will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A backlash elimination combined gear, comprising a main gear (1) and a sub-gear (2), characterized in that, The left end of the main gear (1) protrudes with a first sleeve (3). An annular groove (4) is provided on the left end of the main gear (1) and is arranged around the outer wall of the first sleeve (3). A first clamping groove (5) is provided on the first sleeve (3). A first shaft hole (6) is provided in the first sleeve (3) and penetrates through the main gear (1). The right end of the secondary gear (2) protrudes with a second sleeve (7) adapted to the outer groove wall of the annular groove (4). A second shaft hole (10) adapted to the outer wall of the first sleeve (3) is provided on the left end of the secondary gear (2). A second clamping groove (9) is provided on the side wall of the second sleeve (7). A torsion spring (11) with both ends respectively clamped with the first clamping groove (5) and the second clamping groove (9) is provided between the outer wall of the first sleeve (3) and the inner wall of the second sleeve (7). A threaded through hole (12) is provided on the main gear (1). A bolt (13) is detachably provided in the threaded through hole (12). A positioning hole (14) adapted to the bolt (13) is provided on the secondary gear (2). A first avoidance notch (15) coaxial with the threaded through hole (12) is provided on the groove wall of the annular groove (4) of the main gear (1). A second avoidance notch (16) coaxial with the positioning hole (14) is provided on the second sleeve (7) of the secondary gear (2). A keyway (17) is provided in the first shaft hole (6).

2. The anti-play combined gear according to claim 1, wherein A first boss (18) is provided on the right end of the main gear (1).

3. A backlash elimination combined gear according to claim 2, characterized in that, Two first disassembly and assembly holes (19) are symmetrically provided on the first boss (18).

4. A backlash elimination combined gear according to claim 1, characterized in that, A second boss (20) is provided on the left end of the secondary gear (2).

5. A backlash elimination combined gear according to claim 4, characterized in that, Two second disassembly and assembly holes (21) are symmetrically provided on the second boss (20).

6. A backlash elimination combined gear according to claim 1, characterized in that, A counterbore (8) is provided inside the second sleeve (7).

7. A backlash elimination combined gear according to claim 1, characterized in that, The first clamping groove (5) is an L-shaped groove communicating with the annular groove (4), and the second clamping groove (9) is a straight groove vertically provided on the side wall of the second sleeve (7).

Images