Large-load damping gear assembly structure

Abstract

The invention relates to a large-load damping gear assembly structure. The large-load damping gear assembly structure comprises a hub; the gear ring is annular; the annular piece is sleeved between the outer side of the hub and the inner side of the gear ring, the inner surface of the annular piece is connected with the outer surface of the hub through a first spline pair, and the outer surface of the annular piece is connected with the inner surface of the gear ring through a second spline pair; the hub, the annular piece and the gear ring are concentrically arranged, and the distance between the outer side of the first spline pair and the circle center is smaller than that between the inner side of the second spline pair and the circle center. According to the large-load damping gear assembly structure, the inner surface of the annular piece is in spline connection with the outer surface of the hub, and the outer surface of the annular piece is in spline connection with the inner surface of the gear ring, so that the contact area of the annular piece and a steel part is at least increased by 50%, and the adhesive force of rubber is greatly improved; due to the design of two-side bonding connection, abnormal loads can be well dispersed out, the circumferential bearing torque of the large-load damping gear assembly structure is greatly increased, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of gears, and in particular to a heavy-load shock-absorbing gear assembly structure. Background Art

[0002] Cars with engines, especially hybrid cars, have high requirements for running stability and low vibration, and need to rely on balance shafts to reduce vibration caused by free inertia force and inertia moment. The balance shaft is usually driven by a crankshaft, and the crankshaft is connected to the balance shaft through gears. In order to reduce the noise of the meshing of the teeth between the balance shaft and the crankshaft and absorb vibration, a large-load shock-absorbing gear assembly structure is usually used. A large-load shock-absorbing gear assembly structure includes an internal wheel hub, an external gear ring, and a rubber ring formed between the outer surface of the wheel hub and the inner surface of the gear ring. Since the rubber ring in the middle is annular, its ability to withstand torque and axial downward pressure is poor.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In view of the deficiencies in the prior art, an embodiment of the present invention discloses a large-load shock-absorbing gear assembly structure to solve the problem that the large-load shock-absorbing gear assembly structure is poor in withstanding torque and axial downward pressure.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A large-load shock-absorbing gear assembly structure comprises: a circular wheel hub; an annular gear ring; an annular member sleeved between the outer side of the wheel hub and the inner side of the gear ring, wherein the inner surface is connected to the outer surface of the wheel hub via a first spline pair, and the outer surface is connected to the inner surface of the gear ring via a second spline pair; wherein the wheel hub, the annular member and the gear ring are cocentrically arranged, and the distance between the outer side of the first spline pair and the center of the circle is smaller than the distance between the inner side of the second spline pair and the center of the circle.

[0007] A further technical solution is that the outer surface of the hub has a first external spline, the inner surface of the ring gear has a first internal spline, the inner surface of the annular member has a second internal spline keyed to the first external spline, and the outer surface of the annular member has a second external spline keyed to the first internal spline.

[0008] A further technical solution is that the first external spline, the first internal spline, the second internal spline and the second external spline are any one of an involute tooth shape, a rectangular tooth shape, a triangular tooth shape and a circular arc tooth shape.

[0009] A further technical solution is that a second groove is axially provided on the surface of the first external spline, the first internal spline, the second internal spline and the second external spline.

[0010] A further technical solution is that the wheel hub is made of 40Cr steel, and the hardness after quenching and tempering is 34-38HRC.

[0011] A further technical solution is that the annular member is made of vulcanized rubber.

[0012] A further technical solution is that the gear ring is made of 16MnCr5 steel, and after carburizing and quenching treatment, the hardness is 58-62HRC, the layer depth is 0.3-0.6 (512HV), and the core hardness is 28-48HRC.

[0013] A further technical solution is that a through hole is provided in the middle of the wheel hub, a key groove is provided on the inner surface of the through hole, and both ends of the through hole are chamfered.

[0014] A further technical solution is that first annular grooves are provided on the surfaces of the front and rear ends of the hub.

[0015] A further technical solution is that drum-shaped teeth are arranged in an annular shape on the outer surface of the gear ring.

[0016] The present invention also discloses a method for manufacturing a large-load damping gear assembly structure, comprising the following steps:

[0017] Preparation of gear ring: forging, isothermal normalizing, pre-heat finishing, gear hobbing, chamfering, carburizing and quenching, stripping and turning, and drawing the first internal spline on the inner surface;

[0018] Hub preparation: forging, rough turning, quenching and tempering, finish turning, and rolling the first external spline on the outer surface;

[0019] Preparation of the ring parts: After the inner surface of the gear ring and the outer surface of the hub are coated with glue, the rubber is injected and vulcanized after molding;

[0020] Finished products: turning inner holes, drawing keyways, and grinding teeth.

[0021] The beneficial effects of the embodiments of the present invention are as follows:

[0022] (I) The heavy-load shock-absorbing gear assembly structure of the present invention includes a wheel hub, a gear ring and an annular member. The inner surface of the annular member is spline-connected to the outer surface of the wheel hub, and the outer surface of the annular member is spline-connected to the inner surface of the gear ring, so that the contact area between the annular member and the steel part is increased by at least 50%. Under the same vulcanization process, the adhesion of the rubber is greatly improved. When a heavy-load shock-absorbing gear assembly structure is subjected to abnormal alternating loads, the design of the two-sided keyed connection can well disperse the abnormal load to the tooth surfaces of all spline pairs. Under the conditions of the same size and bonding strength, the circumferential load-bearing torque of a heavy-load shock-absorbing gear assembly structure is greatly increased, and the service life is improved. It can be widely used in various transmission systems with large impact loads.

[0023] (ii) Furthermore, an annular first groove is provided on the surfaces of the front and rear ends of the wheel hub, which reduces the weight of the heavy-load shock-absorbing gear assembly structure while ensuring that the heavy-load shock-absorbing gear assembly structure has a certain strength, thereby reducing the cost.

[0024] (III) Furthermore, a second groove is provided on the surface of the first external spline, the first internal spline, the second internal spline and the second external spline along the axial direction. When a large-load shock-absorbing gear assembly structure is subjected to an axial force when the tooth portion is a helical gear, and an abnormal axial impact, the trapezoidal second groove structure has a good buffering effect on the annular part, and greatly improves the axial load-bearing destructive torque index of the large-load shock-absorbing gear assembly structure, and improves the service life of the large-load shock-absorbing gear assembly structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view structural schematic diagram of the heavy load damping gear assembly structure of the present invention.

[0026] Figure 2 for Figure 1 Section view at AA.

[0027] In the figure:

[0028] 1. Hub; 11. First through hole; 12. Keyway; 13. First groove; 14. First external spline; 2. Ring; 21. Second external spline; 22. Second internal spline; 3. Ring gear; 31. First internal spline; 32. Tooth; 4. Second groove. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0031] First embodiment:

[0032] This embodiment discloses a high-load shock-absorbing gear assembly structure.

[0033] A heavy-load shock-absorbing gear assembly structure comprises a wheel hub 1, a gear ring 3 and an annular member 2.

[0034] The wheel hub 1 is circular. For example, the wheel hub 1 is made of 40Cr steel, and the hardness after quenching and tempering is 34-38HRC. The weight percentage of each chemical element in the wheel hub 1 is: C: 0.37-0.44%; Si: 0.17-0.37%; Mn: 0.5-0.8%; Cr: 0.8-1.1%; the balance is Fe.

[0035] The gear ring 3 is annular. For example, the gear ring 3 is made of 16MnCr5 steel. After carburizing and quenching, the hardness is 58-62HRC, the layer depth is 0.3-0.6 (512HV), and the core hardness is 28-48HRC. The weight percentage of each chemical element in the gear ring 3 is: C: 0.14-0.19%; Si≤0.4%; Mn: 1-1.3%; P≤0.025%; S≤0.035%; Cr: 0.8-1.1%; the balance is Fe.

[0036] The annular member 2 is sleeved between the outer side of the hub 1 and the inner side of the gear ring 3. The inner surface is connected to the outer surface of the hub 1 via a first spline pair, and the outer surface is connected to the inner surface of the gear ring 3 via a second spline pair.

[0037] The hub 1, the annular member 2 and the gear ring 3 are arranged cocentrically, and the distance between the outer side of the first spline pair and the center of the circle is smaller than the distance between the inner side of the second spline pair and the center of the circle. Exemplarily, the outer surface of the hub 1 has a first external spline 14, the inner surface of the gear ring 3 has a first internal spline 31, the inner surface of the annular member 2 has a second internal spline 22 bonded to the first external spline 14, and the outer surface of the annular member 2 has a second external spline 21 bonded to the first internal spline 31. The radius R1 of the top circle of the first external spline 14 is smaller than the radius R2 of the root circle of the first internal spline 31, so as to avoid the first spline pair and the second spline pair from overlapping each other, which would affect the force dispersion effect of the bonded part.

[0038] Specifically, the first external spline 14, the first internal spline 31, the second internal spline 22 and the second external spline 21 can be involute tooth shape, rectangular tooth shape, triangular tooth shape, etc., or can be arc tooth shape, knurling and other special-shaped tooth shapes, and knurling includes reticulated knurling, straight knurling and other shapes, as long as the inner surface and outer surface of the ring member 2 can be spline-connected with the outer surface of the hub 1 and the inner surface of the gear ring 3, respectively, the present invention does not make further restrictions on this. The ring member 2 is made of vulcanized rubber. The rubber can be, for example, hydrogenated nitrile rubber or fluororubber.

[0039] Furthermore, a second groove 4 is axially provided on the surface of the first external spline 14, the first internal spline 31, the second internal spline 22, and the second external spline 21. Exemplarily, the cross section of the second groove 4 is an inverted isosceles trapezoid, and is provided in the middle position of the surface of the first external spline 14, the first internal spline 31, the second internal spline 22, and the second external spline 21. When a large-load shock-absorbing gear assembly structure is subjected to an axial force when the tooth portion 32 is a helical gear, and an abnormal axial impact, the trapezoidal second groove 4 structure has a good buffering effect on the ring part 2, and greatly improves the axial load-bearing destructive torque index of a large-load shock-absorbing gear assembly structure, and improves the service life of a large-load shock-absorbing gear assembly structure.

[0040] Furthermore, a through hole 11 is provided in the middle of the hub 1, a keyway 12 is provided on the inner surface of the through hole 11, and both ends of the through hole 11 are chamfered to facilitate the insertion and fixation of the key shaft.

[0041] Furthermore, an annular first groove 13 is formed on the front and rear end surfaces of the hub 1 to reduce the weight of the heavy-load shock-absorbing gear assembly structure while ensuring that the heavy-load shock-absorbing gear assembly structure has a certain strength.

[0042] Furthermore, the outer surface of the gear ring 3 is provided with a tooth portion 32 in an annular shape. The tooth portion 32 can be arranged parallel or inclined relative to the axial direction. Preferably, the tooth portion 32 is a drum-shaped tooth, which improves the friction and wear of the tooth surface and reduces noise.

[0043] A method for manufacturing a large-load damping gear assembly structure comprises the following steps:

[0044] Step S1, preparing the gear ring 3: forging, isothermal normalizing, pre-heat finishing, gear hobbing, chamfering, carburizing and quenching, stripping and turning, and drawing the first internal spline 31 on the inner surface.

[0045] Specifically, the isothermal normalizing step includes: heating the gear ring 3 forging to 920-930° C., isothermally maintaining at 550-600° C. to obtain a finer pearlite+ferrite structure, and then air cooling.

[0046] Step S2, preparing the wheel hub 1: forging, rough turning, quenching and tempering, finish turning, and rolling the first external spline 14 on the outer surface.

[0047] Step S3, preparing the annular member 2: injecting rubber between the inner surface of the gear ring 3 and the outer surface of the wheel hub 1, and vulcanizing after molding.

[0048] Step S4 , obtaining a finished product: the wheel hub 1 has a through hole 11 , a key groove 12 is drawn inside the through hole 11 , and the through hole 11 is positioned to form a grinding tooth portion 32 .

[0049] Experimental example:

[0050] The performance of a manufactured large-load shock-absorbing gear assembly structure was tested.

[0051] (1) The wheel hub 1 is fixed, and the gear ring 3 is torsionally rotated with a torque of 85 Nm using a fully automatic torsion testing machine. The alternating test is performed 5 million times at a test frequency of 20 Hz. The structure of a large-load shock-absorbing gear assembly is not damaged.

[0052] (2) A universal tensile testing machine is used, and an annular fixture is used to support the outer side of the ring gear 3, and axial pressure is applied to the inside of the hub 1. The axial pressure destructive force is greater than 25 KN.

[0053] It can be seen that the heavy-load shock-absorbing gear assembly structure of the present invention has a simple structure, light weight and low cost. The inner surface of the annular member 2 is spline-connected to the outer surface of the hub 1, and the outer surface of the annular member 2 is spline-connected to the inner surface of the gear ring 3, so that the contact area between the annular member 2 and the steel part is increased by at least 50%. Under the same vulcanization process, the adhesion of the rubber is greatly improved. When the heavy-load shock-absorbing gear assembly structure is subjected to abnormal alternating loads, the design of the two-sided keyed connection can well disperse the abnormal load to the tooth surfaces of all spline pairs. Under the conditions of the same size and bonding strength, the circumferential load-bearing torque of the heavy-load shock-absorbing gear assembly structure is greatly increased, and the service life is improved. The structure can be widely used in various transmission systems with large impact loads.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A large load damping gear assembly structure, characterized in that: include: The wheel hub is circular; The gear ring is annular; An annular member, sleeved between the outer side of the wheel hub and the inner side of the gear ring, with the inner surface connected to the outer surface of the wheel hub via a first spline pair, and the outer surface connected to the inner surface of the gear ring via a second spline pair; Wherein, the wheel hub, the annular member and the gear ring are arranged concentrically, and the distance between the outer side of the first spline pair and the center of the circle is smaller than the distance between the inner side of the second spline pair and the center of the circle.

2. The heavy load damping gear assembly structure according to claim 1 is characterized in that: The hub outer surface has a first external spline, the gear ring inner surface has a first internal spline, the annular member inner surface has a second internal spline keyed to the first external spline, and the annular member outer surface has a second external spline keyed to the first internal spline.

3. The heavy load damping gear assembly structure according to claim 2 is characterized in that: The first external spline, the first internal spline, the second internal spline and the second external spline are any one of an involute tooth shape, a rectangular tooth shape, a triangular tooth shape and a circular arc tooth shape.

4. The heavy load damping gear assembly structure according to claim 2 is characterized in that: A second groove is axially formed on the surfaces of the first external spline, the first internal spline, the second internal spline and the second external spline.

5. The heavy load damping gear assembly structure according to claim 1, characterized in that: The wheel hub is made of 40Cr steel, and the hardness is 34-38HRC after quenching and tempering.

6. The heavy load damping gear assembly structure according to claim 1, characterized in that: The annular member is made of vulcanized rubber.

7. The heavy load damping gear assembly structure according to claim 1, characterized in that: The gear ring is made of 16MnCr5 steel. After carburizing and quenching, the hardness is 58-62HRC, the layer depth is 0.3-0.6, and the core hardness is 28-48HRC.

8. The heavy load damping gear assembly structure according to claim 1, characterized in that: A through hole is provided in the middle of the wheel hub, a key groove is provided on the inner surface of the through hole, and both ends of the through hole are chamfered.

9. The heavy load damping gear assembly structure according to claim 1, characterized in that: The surfaces of the front and rear ends of the hub are provided with annular first grooves.

10. The heavy load damping gear assembly structure according to claim 1, characterized in that: The outer surface of the gear ring is provided with drum-shaped teeth in an annular shape.

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