A transmission wheel assembly with a tolerance compensation function

Abstract

The application provides a transmission wheel assembly with a tolerance compensation function, which comprises a tolerance compensation wheel and a power wheel coaxially assembled, a plurality of groups of force transmission teeth are arranged on the outer periphery of the tolerance compensation wheel, the end surface of the power wheel is provided with force transmission grooves matched with the force transmission teeth, the end surface of the tolerance compensation wheel is provided with a plurality of groups of matching surfaces, the height of each group of matching surfaces is different, the end surface of the power wheel is provided with a boss matched with any one group of matching surfaces, each group of force transmission teeth corresponds to a group of different matching surfaces, and the boss is assembled with different matching surfaces according to the installation axial dimension tolerance of the driving machine or the driven machine transmission wheel, so that the axial installation precision of the power wheel is improved. The transmission wheel assembly can be selected according to the installation axial dimension tolerance of the driving machine or the driven machine power wheel, the axial installation precision of the power wheel is effectively improved, the transmission plane height difference of the driving wheel and the driven wheel is reduced, the wear and the running noise of the moving part are reduced, and the service life of the transmission element is prolonged.

Description

Technical Field

[0001] This invention relates to the field of engine gear train transmission technology, and specifically to a transmission wheel assembly with tolerance compensation function. Background Technology

[0002] Currently, engine transmission systems such as belt drives and chain drives are reaching increasingly higher speeds, and the number of driven components on the same transmission chain is also increasing, resulting in heavier loads. To reduce wear and noise of transmission components and improve their service life, the requirements for the alignment of the transmission planes of the driving and driven wheels are becoming increasingly stringent.

[0003] Because the assembly errors of the driving and driven motors are relatively large, they have the greatest impact on the alignment of the transmission plane. However, to improve the axial positioning accuracy of the driving or driven motors, it is generally necessary to improve the processing technology and the machining accuracy of the machine tools, which will result in a significant increase in costs. Summary of the Invention

[0004] The purpose of this invention is to provide a transmission wheel assembly that is cost-effective, easy to assemble, and has tolerance compensation function to solve the above-mentioned technical problems.

[0005] This invention provides a transmission wheel assembly with tolerance compensation function, including a tolerance compensation wheel and a drive wheel coaxially assembled. The tolerance compensation wheel has multiple sets of force transmission teeth on its outer periphery. The end face of the drive wheel has a force transmission groove that mates with the force transmission teeth. The end face of the tolerance compensation wheel has multiple sets of optional surfaces, each set having a different height. The end face of the drive wheel has a boss that can mate with any set of optional surfaces. Each set of force transmission teeth corresponds to a different set of optional surfaces. The boss is assembled with different optional surfaces according to the axial dimensional tolerance of the drive wheel of the driving or driven motor, thereby improving the axial installation accuracy of the drive wheel.

[0006] By setting a tolerance compensation wheel with optional surfaces and transmission teeth, and a transmission groove and boss on the drive wheel, the corresponding set of transmission teeth can be precisely engaged in the transmission groove when the boss is assembled with one set of optional surfaces. Therefore, by changing the optional surface of the boss mating according to the axial dimensional tolerance of the drive wheel of the driving or driven mechanism, the axial installation accuracy of the drive wheel can be improved, and the height difference between the transmission planes of the driving and driven wheels can be reduced, thereby reducing the wear of moving parts and operating noise. Since both the tolerance compensation wheel and the drive wheel are of a single specification, there is no need to consider the procurement and inventory management of parts of different groups, effectively reducing management costs. The simple matching method simplifies the matching process and improves assembly efficiency, effectively reducing manufacturing costs. Furthermore, it avoids modifications to the driving or driven components themselves, significantly saving on technical improvement costs.

[0007] Furthermore, the end face of the drive wheel with the force transmission groove is provided with an external recess for avoiding the optional surface.

[0008] By setting an external recess, when the boss is assembled with any set of optional surfaces, there is a gap between the external recess and other optional surfaces, which will not affect the fit between the optional surfaces and the boss.

[0009] Furthermore, there is a gap between the bottom of the force transmission groove and the force transmission tooth.

[0010] The force transmission groove is machined to a certain depth so that when the boss is assembled with any set of optional surfaces, there is a gap between the bottom of the force transmission groove and the force transmission teeth, which will not affect the fit between the optional surfaces and the boss.

[0011] Furthermore, both the optional surfaces and the bosses are fan-shaped, and the angle bisector of the central angle of each optional surface passes through the axis of the tolerance compensation wheel, while the angle bisector of the central angle of the bosses passes through the axis of the power wheel.

[0012] The angle bisectors of the central angles of the optional surface and the boss pass through the axes of the tolerance compensation wheel and the power wheel, respectively, so that the overall structure is subjected to uniform force.

[0013] Furthermore, the central angle of the boss is smaller than the central angle of the mating surface.

[0014] The central angle of the boss is smaller than that of the optional surface, which ensures that each boss will not interfere with the boundary edge between adjacent optional surfaces under any optional grouping, and can also fit perfectly with the corresponding optional surface.

[0015] Furthermore, multiple sets of optional surfaces are evenly distributed on the end face where the tolerance compensation wheel and the power wheel mate.

[0016] Multiple sets of optional surfaces are evenly distributed on the end face of the tolerance compensation wheel and the power wheel, which maximizes the surface area of ​​the boss and the tolerance compensation wheel, thereby preventing the boss or optional surface from being crushed after the installation nut of the transmission wheel assembly is tightened.

[0017] Furthermore, there are two symmetrically arranged bosses and force transmission grooves, and each set of optional surfaces includes two symmetrically arranged optional surfaces, which can make the force conditions of the tolerance compensation wheel and the power wheel better.

[0018] Furthermore, the end face of the drive wheel is provided with multiple fixed teeth, and a force transmission groove is formed between two adjacent fixed teeth. Reinforcing ribs are provided on the fixed teeth. The reinforcing ribs can improve the load-bearing capacity of the fixed teeth.

[0019] Furthermore, the power wheel is provided with a non-through concave stop in the axial direction, and the tolerance compensation wheel is provided with a convex stop in the axial direction for insertion into the concave stop, wherein the depth of the concave stop is greater than the height of the convex stop.

[0020] The depth of the concave stop is greater than the height of the convex stop, so that the fit between the mating surface and the boss will not be affected.

[0021] Furthermore, the root of the force transmission tooth transitions to the outer periphery of the tolerance compensation wheel via a fillet. This reduces stress concentration at the root of the force transmission tooth.

[0022] Furthermore, a transition blank is provided between the raised stop and the optional surface. This ensures that the raised stop and the optional surface are processed independently.

[0023] Furthermore, each set of transmission teeth has different grouping marks on the end face away from the selection surface. Different grouping marks correspond to different selection surfaces, and the selection is completed by installing the transmission teeth corresponding to the grouping marks into the transmission grooves of the drive wheel.

[0024] The beneficial effects of this invention are as follows: By setting a tolerance compensation wheel, with optional surfaces and force transmission teeth on the tolerance compensation wheel, and a force transmission groove and a boss on the drive wheel, when the boss is assembled with one set of optional surfaces, a set of force transmission teeth can be precisely engaged in the force transmission groove. Therefore, by changing the optional surface of the boss mating according to the axial dimensional tolerance of the drive wheel of the driving or driven machine, the axial installation accuracy of the drive wheel can be improved, and the height difference between the transmission planes of the driving and driven wheels can be reduced, thereby reducing the wear of moving parts and operating noise. Both the tolerance compensation wheel and the drive wheel are of a single specification, thus eliminating the need to consider the procurement and inventory management of parts of different groups, effectively reducing management costs. The simple matching method simplifies the matching process and improves assembly efficiency, effectively reducing manufacturing costs. Furthermore, it avoids modifications to the driving or driven components themselves, significantly saving on technical improvement costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the transmission wheel assembly structure according to Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of one end face of the tolerance compensation wheel in Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the other end face of the tolerance compensation wheel in Embodiment 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the power wheel in Embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the second optional surface of the tolerance compensation wheel and the power wheel in Embodiment 1 of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the first mating surface of the tolerance compensation wheel and the power wheel in Embodiment 1 of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the third optional surface of the tolerance compensation wheel and the power wheel in Embodiment 1 of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of one end face of the tolerance compensation wheel in Embodiment 2 of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of the other end face of the tolerance compensation wheel in Embodiment 2 of the present invention;

[0034] Figure 10 This is a schematic diagram of the structure of the fourth optional surface of the tolerance compensation wheel and the power wheel in Embodiment 2 of the present invention;

[0035] Figure 11 This is a schematic diagram of the structure of the fifth optional surface of the tolerance compensation wheel and the power wheel in Embodiment 2 of the present invention;

[0036] Figure label:

[0037] Tolerance compensation wheel 1; power transmission gear 11; optional surface 12; first optional surface 121; second optional surface 122; third optional surface 123; fourth optional surface 124; fifth optional surface 125; raised stop 13; group mark 14; weight reduction round pit 15; axial positioning reference surface 16;

[0038] 2. Drive wheel; 21. Transmission groove; 22. Boss; 23. Outer recess; 24. Fixing tooth; 25. Reinforcing rib; 26. Recessed stop; 27. Inner recess; 28. Through hole. Detailed Implementation

[0039] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0040] Example 1

[0041] Example 1 provides a drive wheel assembly with three sets of selectable surfaces 12. For example... Figure 1 As shown, the transmission wheel assembly includes a tolerance compensation wheel 1 and a power wheel 2 that are coaxially assembled.

[0042] like Figure 2 , 3As shown, the tolerance compensation wheel 1 has a cylindrical structure. The blank of the tolerance compensation wheel 1 is made by casting or powder metallurgy. A convex stop 13 and multiple sets of mating surfaces 12 are provided on one end face of the tolerance compensation wheel 1. The convex stop 13 is located at the center of the tolerance compensation wheel 1. The multiple sets of mating surfaces 12 are arranged around the outer periphery of the convex stop 13. In this embodiment, a total of three sets of mating surfaces 12 are provided. Each set of mating surfaces 12 includes two symmetrical mating surfaces 12. The first set of mating surfaces 12 includes two first mating surfaces 121. The second set of mating surfaces 12 includes two second mating surfaces 122. The third set of mating surfaces 12 includes two third mating surfaces 123. The height of the first mating surfaces 121, the second mating surfaces 122, and the third mating surfaces 123 gradually increases. The first mating surfaces 121, the second mating surfaces 122, and the third mating surfaces 123 are mating surfaces 12 that match the axial positioning dimensions of the driving or driven motor in the upper, middle, and lower tolerance zones, respectively.

[0043] In this embodiment, the optional surface 12 is fan-shaped, and the angle bisector plane of the central angle of all optional surfaces 12 passes through the central axis of the tolerance compensation wheel 1.

[0044] When machining the protruding stop 13, a certain height of transition blank should be reserved between the protruding stop 13 and the optional surface 12. Similarly, when machining the optional surface 12, a certain width of transition blank should also be reserved between adjacent optional surfaces 12. This ensures that the protruding stop 13 and the optional surface 12 are machined independently.

[0045] like Figure 3 As shown, the tolerance compensation wheel 1 has a cylindrical through hole machined in its center, and a weight-reducing circular pit 15 is formed on the end face of the tolerance compensation wheel 1 away from the optional surface 12. An axial positioning reference surface 16 is machined in the weight-reducing circular pit 15. If the center hole of the tolerance compensation wheel 1 is a conical through hole, then axial positioning is performed by the conical through hole, and there is no need to machine the axial positioning reference surface 16.

[0046] like Figure 2 As shown, three sets of force-transmitting teeth 11 are evenly arranged on the outer wall of the tolerance compensation wheel 1. Each set of force-transmitting teeth 11 includes two symmetrical force-transmitting teeth 11. The force-transmitting teeth 11 are rectangular, and the plane of symmetry of the width of all force-transmitting teeth 11 passes through the central axis of the tolerance compensation wheel 1. The top surface of all force-transmitting teeth 11 is a cylindrical surface with the same diameter. The root of the force-transmitting teeth 11 transitions to the outer wall of the tolerance compensation wheel 1 with a fillet to reduce stress concentration. The two sides of the force-transmitting teeth 11 are machined to ensure position and tooth width accuracy, while avoiding machining the fillet at the root of the force-transmitting teeth 11.

[0047] like Figure 3As shown, three consecutive transmission teeth 11 have grouping marks 14 cast sequentially on their end faces away from the selection surface 12, namely A, B, and C. Grouping marks 14 represent the combination of the transmission tooth 11 with this grouping mark 14 and the selection surface 12, whose central angle bisector is perpendicular to the width symmetry plane of the transmission tooth 11. That is, the transmission tooth 11 with grouping mark 14 A corresponds to the second selection surface 122 perpendicular to the width symmetry plane of the transmission tooth 11. Figure 5 , 6 As shown in Figures 7 and 8, in this embodiment, the power transmission tooth 11 with grouping mark 14 A corresponds to two second optional surfaces 122, the power transmission tooth 11 with grouping mark 14 B corresponds to two first optional surfaces 121, and the power transmission tooth 11 with grouping mark 14 C corresponds to two third optional surfaces 123.

[0048] like Figure 4 As shown, the blank of the power wheel 2 is also made by casting or powder metallurgy. The power wheel 2 is designed as a cylindrical structure. Two symmetrical bosses 22 are provided on one end face of the power wheel 2. The bosses 22 are fan-shaped structures. The angle bisector of the central angle of the bosses 22 passes through the central axis of the power wheel 2. The central angle of the bosses 22 is 5° smaller than the central angle of the optional surface 12 to ensure that when the bosses 22 are mated with any optional surface 12, the bosses 22 will not interfere with the dividing edge of the optional surface 12, and can also fit completely with the corresponding optional surface 12.

[0049] On the end face of the boss 22 of the drive wheel 2, there is also an outer recess 23 that avoids the optional surface 12 of the tolerance compensation wheel 1. The depth of the recess 23 must ensure that there is a gap between the boss 22 and the optional surface 12 when the boss 22 mates with any optional surface 12. In addition, the boss 22 of the drive wheel 2 must have sufficient area to prevent itself or the optional surface 12 from being crushed after the installation nut of the transmission wheel assembly is tightened. Therefore, it is necessary to increase the area of ​​the optional surface 12 as much as possible, and multiple sets of optional surfaces 12 can be evenly distributed on the end face of the tolerance compensation wheel 1.

[0050] A pair of force transmission grooves 21 are symmetrically arranged in the direction perpendicular to the bisector of the central angle plane of the boss 22. Each force transmission groove 21 is formed by two fixing teeth 24. The radial position of the force transmission grooves 21 avoids interference with the chain or belt. The depth of the force transmission grooves 21 is such that when the boss 22 mates with any optional surface 12, there is a gap between the bottom of the force transmission groove 21 and the force transmission teeth 11. Reinforcing ribs 25 are provided on the outer side of the fixing teeth 24 on both sides of the force transmission grooves 21 to improve their load-bearing capacity.

[0051] The center of the power wheel 2 has a non-through recessed stop 26, the depth of which is greater than the height of the convex stop 13 of the tolerance compensation wheel 1. A through hole 28 is provided below the recessed stop 26. An inner recess 27 is provided above the recessed stop 26 to avoid the transition blank of the tolerance compensation wheel 1, and an outer recess 23 is located outside the inner recess 27.

[0052] During assembly, first install the tolerance compensation wheel 1 onto the drive shaft of the driving or driven motor. Then, align the force transmission groove 21 on the power wheel 2 with the corresponding force transmission teeth 11 on the tolerance compensation wheel 1 according to the grouping mark 14 on the driving or driven motor. Finally, use nuts to secure the drive wheel assembly to the drive shaft of the driving or driven motor.

[0053] Let the upper deviation of the axial positioning dimension Lc of the driving or driven motor be es, and the lower deviation be ei. δ is the compensation amount of the tolerance compensation wheel 1 and the optional surface 12. In this embodiment, the upper deviation es of the axial positioning dimension of the driven motor is 0.6, and the lower deviation ei is -0.6. Three grouping selection schemes are adopted, as detailed in the table below:

[0054]

[0055] Example 2

[0056] Example 2 provides a transmission wheel assembly with two sets of selectable surfaces 12. The transmission wheel assembly includes a tolerance-compensating wheel 1 and a drive wheel 2 that are coaxially mounted.

[0057] like Figure 8 , 9 As shown, the tolerance compensation wheel 1 is cylindrical with a cylindrical through hole at its center. Two sets of optional surfaces 12 are provided on one end face of the tolerance compensation wheel 1. Each set of optional surfaces 12 includes two optional surfaces 12, which are fan-shaped. The first set of optional surfaces 12 includes two fourth optional surfaces 124, and the second set includes two fifth optional surfaces 125. The height of the fourth optional surfaces 124 is lower than the height of the fifth optional surfaces 125. Two pairs of force transmission teeth 11 are provided on the outer wall of the tolerance compensation wheel 1. The plane of symmetry of the width of the first pair of force transmission teeth 11 is the same plane as the plane bisecting the angle of the central angle of the first optional surface 121. The plane of symmetry of the width of the second pair of force transmission teeth 11 is the same plane as the plane bisecting the angle of the central angle of the second optional surface 122. The structure of the power wheel 2 is the same as that in Embodiment 1.

[0058] Figure 10 , 11 Considering the cases where the fifth optional surface 125 mates with the boss 22 and the fourth optional surface 124 mates with the boss 22, let the upper deviation of the axial positioning dimension Lc of the drive wheel of the driving or driven motor be es and the lower deviation be ei. In this embodiment, the upper deviation es of the axial positioning dimension of the driven wheel 2 is 0.6 and the lower deviation ei is -0.6, then the following optional configurations are available:

[0059]

[0060] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A drive wheel assembly having a tolerance compensation function, characterized by: The device includes a tolerance compensation wheel (1) and a power wheel (2) that are coaxially assembled. The tolerance compensation wheel (1) has multiple sets of force transmission teeth (11) on its outer periphery. The power wheel (2) has a force transmission groove (21) on its end face that mates with the force transmission teeth (11). The tolerance compensation wheel (1) has multiple sets of optional surfaces (12) on its end face. Each set of optional surfaces (12) has a different height. The power wheel (2) has a boss (22) on its end face that can mate with any set of optional surfaces (12). Each set of force transmission teeth (11) corresponds to a different set of optional surfaces (12). The boss (22) is assembled with different optional surfaces (12) according to the axial dimension tolerance of the power wheel of the driving or driven motor, thereby improving the axial installation accuracy of the power wheel (2). The end face of the power wheel (2) with the force transmission groove (21) is provided with an outer recess (23) for avoiding the optional surface (12). There is a gap between the bottom of the force transmission groove (21) and the force transmission tooth (11).

2. The transmission wheel assembly with tolerance compensation function according to claim 1, characterized in that: Both the optional surface (12) and the boss (22) are fan-shaped. The bisector of the central angle of each optional surface (12) passes through the axis of the tolerance compensation wheel (1), and the bisector of the central angle of the boss (22) passes through the axis of the power wheel (2).

3. The transmission wheel assembly with tolerance compensation function according to claim 2, characterized in that: The central angle of the boss (22) is smaller than the central angle of the optional surface (12).

4. The transmission wheel assembly with tolerance compensation function according to claim 1, characterized in that: Multiple sets of optional surfaces (12) are evenly distributed on the end face of the tolerance compensation wheel (1) and the power wheel (2) that are in contact.

5. The transmission wheel assembly with tolerance compensation function according to any one of claims 1 to 4, characterized in that: The boss (22) and the force transmission groove (21) are both arranged in two symmetrical positions, and each set of optional surfaces (12) includes two symmetrically arranged optional surfaces (12).

6. The transmission wheel assembly with tolerance compensation function according to any one of claims 1 to 4, characterized in that: The end face of the power wheel (2) is provided with a plurality of fixed teeth (24), and a force transmission groove (21) is formed between two adjacent fixed teeth (24). The fixed teeth (24) are provided with reinforcing ribs (25).

7. The transmission wheel assembly with tolerance compensation function according to any one of claims 1 to 4, characterized in that: The power wheel (2) is provided with a non-through concave stop (26) in the axial direction, and the tolerance compensation wheel (1) is provided with a convex stop (13) in the axial direction for insertion into the concave stop (26). The depth of the concave stop (26) is greater than the height of the convex stop (13).

8. The transmission wheel assembly with tolerance compensation function according to any one of claims 1 to 4, characterized in that: The root of the power transmission tooth (11) and the outer periphery of the tolerance compensation wheel (1) are transitioned by a rounded corner.

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