Gear grinding clamp for differential shell assembly of new energy reduction gearbox

Abstract

A gear grinding clamp for a differential shell assembly of a new energy reduction gearbox comprises a lower clamping piece and an upper clamping piece located over the lower clamping piece, and the differential shell assembly is clamped between the upper clamping piece and the lower clamping piece. The device is characterized in that the lower clamping piece comprises a clamping base capable of being clamped on a gear grinding machine tool base, a supporting base coaxially fixed to the top of the clamping base, a lower protective cover coaxially fixed to the top of the supporting base, and a lower friction cone assembly elastically supported on the supporting base and located in the lower protective cover; the upper clamping piece comprises an upper friction cone top capable of being connected with a connector of a tailstock of a gear grinding machine and an upper protective cover coaxially fixed with the upper friction cone top, a main reduction gear of the differential shell assembly is clamped between the lower protective cover and the upper protective cover, and the upper end of a differential shell of the differential shell assembly extends into the upper protective cover and abuts against the upper friction cone top. The lower end of a differential shell of the differential shell assembly extends into the lower protective cover and abuts against the lower friction cone assembly. According to the gear grinding machine, tooth surface vibration marks during gear grinding are effectively reduced, it is guaranteed that the tooth direction V value and gear precision meet the error requirement, and machining quality is improved.

Description

Technical Field

[0001] The utility model relates to a gear grinding fixture for a differential case assembly of a new energy speed reducer, belonging to the technical field of machining fixtures for differential cases of new energy speed reducers. Background Technique

[0002] The differential case assembly of the new energy speed reducer is formed by fixedly connecting a main reduction gear and a differential case. Among them, the working accuracy requirements of the main reduction gear are relatively high, and gear grinding is required to ensure the accuracy. Before gear grinding, the differential case assembly is clamped on a gear grinding machine. Currently, the clamping method of holding the outer circle, positioning with a small end face, and using an upper center is mainly defective as follows:

[0003] 1. The differential case assembly weighs 11.2 Kg. During the machining process, the clamping stability is insufficient, and it is easy to generate vibration and displacement, and it is easy to form grinding vibration marks on the tooth surface during machining, affecting the machining effect.

[0004] 2. The requirement for the tooth direction consistency of the outer circles of the bearings at both ends of the differential case assembly is 0.009 mm, and the gear accuracy requirement is level 5. The positioning reliability of the fixture is not high, so that the tooth direction V value and the gear accuracy after clamping and machining cannot meet the error requirements, resulting in out-of-tolerance quality of the machined products. Content of the Utility Model

[0005] The gear grinding fixture for the differential case assembly of the new energy speed reducer provided by the utility model clamps the main reduction gear with an upper shield and a lower shield, forms a rigid clamping on the main reduction gear, improves the rigidity of the fixture, clamps the differential case with an upper friction center and a lower friction cone assembly, and elastically supports the lower friction cone assembly on a support seat to damp the differential case, effectively reducing the vibration of the differential case assembly during gear grinding, effectively reducing the tooth surface vibration marks during gear grinding, ensuring that the tooth direction V value and the gear accuracy meet the error requirements, and improving the machining quality.

[0006] To achieve the above object, the technical solution adopted by the utility model is:

[0007] The gear grinding fixture for the differential case assembly of the new energy speed reducer is characterized in that: it includes a lower clamping member and an upper clamping member located directly above the lower clamping member. The differential case assembly is clamped between the upper clamping member and the lower clamping member. It is characterized in that: the lower clamping member includes a clamping base that can be clamped on the base of the gear grinding machine, a support seat coaxially fixed on the top of the clamping base, a lower shield coaxially fixed on the top of the support seat, and a lower friction cone assembly elastically supported on the support seat and located in the lower shield. The upper clamping member includes an upper friction center that can be connected to the tailstock interface of the gear grinding machine and an upper shield coaxially fixed to the upper friction center. The main reduction gear of the differential case assembly is clamped between the lower shield and the upper shield. The upper end of the differential case of the differential case assembly extends into the upper shield and abuts against the upper friction center, and the lower end of the differential case of the differential case assembly extends into the lower shield and abuts against the lower friction cone assembly.

[0008] Preferably, the lower shroud is in a flared shape that flares upward. The top of the lower shroud presses against the lower end face of the main reduction gear through a sealing ring. A spring positioning blind hole is provided on the bottom surface of the lower shroud, and a spring positioning groove corresponding to the spring positioning blind hole is provided on the support seat. A compressed first spring is sandwiched between the spring positioning blind hole and the spring positioning groove.

[0009] Preferably, the lower friction cone assembly includes a lower friction cone body coaxially fixed on the support seat, a first cemented carbide cone press-fitted into the top opening of the lower plate friction cone body with an interference fit, and a lower center point elastically supported on the support seat. The lower friction cone body is provided with a through hole along the central axis. The lower center point is inserted into the through hole with a clearance fit and axially positioned by a screw in the lower friction cone body. The top of the lower center point is conical and abuts against the inner edge of the lower end of the differential case. The first cemented carbide cone is located on the outer periphery of the lower center point, and its inner wall is conical and abuts against the outer edge of the lower end of the differential case.

[0010] Preferably, an elastic strut assembly is fixed on the support seat and cooperates with the bottom of the lower center point. The elastic strut assembly includes a plug cover coaxially fixed at the bottom of the support seat, a strut movably arranged in the plug cover, a pressing head cooperating with the bottom end of the lower center point, and a second spring supporting the pressing head directly above the strut. The outer diameter of the lower half section of the strut is smaller than that of the upper half section, and the lower half section of the strut extends downward into the clamping base.

[0011] Preferably, a top surface groove is provided on the top surface of the strut, and a bottom surface groove is provided on the bottom surface of the pressing head. The second spring is sandwiched between the top surface groove and the bottom surface groove, so that the top surface of the strut is separated from the bottom surface of the pressing head and does not contact. The top of the pressing head is aligned with the bottom of the lower center point along the central axis and is in contact and cooperation.

[0012] Preferably, the upper friction cone top includes an upper friction cone body that can be connected to the tailstock interface of the gear grinding machine, and a second cemented carbide cone press-fitted into the bottom opening of the upper friction cone body with an interference fit. The inner wall of the second cemented carbide cone is conical and abuts against the outer edge of the upper end of the differential case.

[0013] Preferably, the upper shroud includes a shroud base body coaxially fixed with the upper friction cone body, and a pressing cover coaxially fixed at the bottom of the shroud base body. The bottom of the pressing cover presses against the upper end face of the main reduction gear teeth through a sealing ring.

[0014] Preferably, a positioning groove is provided on the bottom surface of the shroud base body. The pressing cover is inserted into the positioning groove with a clearance fit. A bolt is installed on the pressing cover, and a screw hole cooperating with the bolt is provided on the shroud base body. A third spring is sleeved on the bolt, and the bolt is tightened in the screw hole to compress the third spring.

[0015] Preferably, a pressing rod arranged axially is installed on the pressing cover, and a pressing rod hole corresponding to the pressing rod is provided on the shroud base body. The pressing rod extends into the pressing rod hole.

[0016] The beneficial effects of the present utility model are:

[0017] The grinding fixture for the differential case assembly of the new energy reduction gearbox of the present utility model clamps the main reduction gear with the upper shield and the lower shield, forming a rigid clamping on the main reduction gear to improve the rigidity of the fixture. The upper friction cone top and the lower friction cone assembly are used to clamp the differential case, and the lower friction cone assembly is elastically supported on the support seat. Vibration damping of the differential case is achieved through elastic support, effectively reducing the vibration of the differential case assembly during gear grinding, effectively reducing the tooth surface vibration marks during gear grinding, improving the processing effect. The main reduction gear and the differential case are respectively positioned and clamped, improving the reliability and stability of clamping and positioning, improving the processing accuracy, solving the problems of out-of-tolerance of the tooth direction V value and gear accuracy, ensuring that the tooth direction V value and gear accuracy meet the error requirements, and improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the grinding fixture for the differential case assembly of the new energy reduction gearbox in the specific embodiment.

[0019] Figure 2 It is a schematic diagram of the lower shield.

[0020] Figure 3 It is a schematic diagram of the support seat.

[0021] Figure 4 It is a schematic diagram of the lower friction cone assembly.

[0022] Figure 5 It is a schematic diagram of the elastic strut assembly.

[0023] Figure 6 It is a schematic diagram of the upper friction cone top.

[0024] Figure 7 It is a schematic diagram of the upper shield. SPECIFIC EMBODIMENTS

[0025] The following Figures 1 - 7 will describe the embodiments of the present utility model in detail.

[0026] The grinding fixture for the differential case assembly of the new energy reduction gearbox is characterized in that: it includes a lower clamping member and an upper clamping member located directly above the lower clamping member. The differential case assembly is clamped between the upper clamping and the lower clamping. The lower clamping member includes a clamping base 1 that can be clamped on the base of the grinding machine tool, a support seat 2 coaxially fixed on the top of the clamping base 1, a lower shield 3 coaxially fixed on the top of the support seat 2, and a lower friction cone assembly 4 elastically supported on the support seat 2 and located in the lower shield. The upper clamping member includes an upper friction cone top 5 that can be connected to the tailstock interface of the grinding machine tool, and an upper shield 6 coaxially fixed to the upper friction cone top 5. The main reduction gear 100 of the differential case assembly is clamped between the lower shield 3 and the upper shield 6. The upper end of the differential case 101 of the differential case assembly extends into the upper shield 6 and abuts against the upper friction cone top 5, and the lower end of the differential case 101 of the differential case assembly extends into the lower shield 3 and abuts against the lower friction cone assembly 4.

[0027] The above-mentioned gear grinding fixture for the differential housing assembly of the new energy speed reducer clamps the main reduction gear 100 with the upper shield 6 and the lower shield 3, forming a rigid clamping on the main reduction gear to improve the rigidity of the fixture. The upper friction cone top 5 and the lower friction cone assembly 4 are used to clamp the differential housing 101, and the lower friction cone assembly 4 is elastically supported on the support base 2. Vibration damping of the differential housing is achieved through elastic support, effectively reducing the vibration of the differential housing assembly during gear grinding, effectively reducing the tooth surface vibration marks during gear grinding, improving the processing effect. The main reduction gear and the differential housing are respectively positioned and clamped, improving the reliability and stability of clamping and positioning, improving the processing accuracy, solving the problems of out-of-tolerance of the tooth direction V value and gear accuracy, ensuring that the tooth direction V value and gear accuracy meet the error requirements, and improving the processing quality.

[0028] Among them, the lower shield 3 has a flared shape that flares upward. The top of the lower shield 3 presses the lower end face of the main reduction gear through a sealing ring. A spring positioning blind hole 31 is opened on the bottom surface of the lower shield 3, and a spring positioning groove 21 corresponding to the spring positioning blind hole is opened on the support base 2. A compressed first spring 7 is clamped between the spring positioning blind hole 31 and the spring positioning groove 21. The clamping base 1 is clamped on the base of the gear grinding machine. The support base 2 is fixed to the clamping base 1. The lower shield 3 is fixedly connected to the support base 2 through bolts, and the first spring 7 is clamped between the support base 2 and the lower shield 3. The vibration of the main reduction gear 100 during gear grinding is further reduced through the first spring 7, further improving the stability of the differential housing assembly during processing, improving the gear grinding accuracy, and effectively reducing the tooth surface vibration marks during gear grinding.

[0029] Among them, the lower friction cone assembly 4 includes a lower friction cone main body 41 coaxially fixed on the support base 2, a cemented carbide cone 42 press-fitted into the top opening of the lower plate friction cone main body 41 with an interference fit, and a lower center point 43 elastically supported on the support base 2. The lower friction cone main body 41 is provided with a through hole along the central axis. The lower center point 43 is inserted into the through hole with a clearance fit and axially positioned by a screw 411 in the lower friction cone main body 41. The top of the lower center point 43 is conical and abuts against the inner edge of the lower end of the differential housing 101. The cemented carbide cone 42 is located on the outer periphery of the lower center point 43, and the inner wall is conical and abuts against the outer edge of the lower end of the differential housing 101. The lower center point 43 is elastically supported on the support base 2, and the top abuts against the inner edge of the lower end of the differential housing. The cemented carbide cone 42 abuts against the outer edge of the lower end of the differential housing. Since both ends of the differential housing are bearing cylinders for installing bearings, and the inner edge and outer edge of the bearing cylinder are both conical surfaces with chamfers, the top of the lower center point 43 can fit with the inner edge of the lower end of the differential housing 101, and the inner wall of the cemented carbide cone 42 can form a contact support with the outer edge of the lower end of the differential housing 101, ensuring the positioning reliability of the lower end of the differential housing.

[0030] Among them, an elastic support rod assembly 8 that cooperates with the bottom of the lower center 43 is fixed on the support base 2. The elastic support rod assembly 8 includes a plug cover 81 coaxially fixed at the bottom of the support base 2, a support rod 82 movably arranged in the plug cover 81, a pressure head 83 that cooperates with the bottom end of the lower center 43, and a second spring 84 that supports the pressure head 83 directly above the support rod 82. The outer diameter of the lower half of the support rod 82 is smaller than that of the upper half, and the lower half of the support rod 82 extends downward into the clamping base 1. The plug cover 81 is fixed to the support base 2, the support rod 82 is placed in the plug cover 81, the second spring 84 is placed on the support rod 82 to support the pressure head 83 directly above the support rod 82, and the pressure head 83 cooperates with the bottom end of the lower center 43 to form an elastic support for the lower center 43 by the second spring 84. The vibration transmitted by the main reduction gear 100 during gear grinding is reduced by the second spring 84, further improving the stability of the differential case assembly during processing, improving the gear grinding accuracy, and effectively reducing the tooth surface vibration marks during gear grinding.

[0031] Among them, a top surface groove is formed on the top surface of the support rod 82, and a bottom surface groove is formed on the bottom surface of the pressure head 83. The second spring 84 is clamped between the top surface groove and the bottom surface groove, so that the top surface of the support rod 82 is separated from the bottom surface of the pressure head 83 and does not contact. The top of the pressure head 83 is aligned with the bottom of the lower center 43 along the central axis and is in contact and cooperation. The second spring 84 supports the pressure head 83, reduces the vibration transmitted by the main reduction gear 100 during gear grinding, and keeps the pressure head 83 and the support rod 82 not in contact, forming a gap between them. The support rod 82 can limit the downward movement of the pressure head 83, and after gear grinding is completed, the support rod 82 can be jacked up so that the support rod 82 and the pressure head 83 form a hard contact, thereby jacking up the differential case assembly to facilitate the removal of the product.

[0032] Among them, the upper friction cone top 5 includes an upper friction cone main body 51 that can be connected to the tailstock interface of the gear grinding machine and a carbide cone two 52 press-fitted into the bottom opening of the upper friction cone main body 51. The inner wall of the carbide cone two 52 is conical and abuts against the outer edge of the upper end of the differential case 101. The tailstock interface of the gear grinding machine is connected to the upper friction cone main body 51. The upper friction cone main body 51 can be pressed down by the tailstock of the gear grinding machine, and the clamping base 1 can be clamped by the base of the gear grinding machine, so that the housing assembly is clamped between the upper clamping member and the lower clamping member. Since both ends of the differential case are bearing cylinders for installing bearings, and the inner and outer edges of the bearing cylinders are conical surfaces with chamfers, the inner wall of the carbide cone two 52 can fit with the outer edge of the upper end of the differential case 101. The outer edge of the lower end of the differential case abuts against the carbide cone one, and the outer edge of the upper end abuts against the carbide cone two. The carbide cone has high hardness and strength, can effectively clamp the differential case, and will not break due to vibration and impact during gear grinding, with high clamping reliability.

[0033] Among them, the upper shield 6 includes a shield base body 61 fixedly connected coaxially with the upper friction cone main body 51, and a gland 62 fixedly connected coaxially to the bottom of the shield base body 61. The bottom of the gland 62 presses the upper end face of the main reduction gear tooth 101 through a sealing ring. The upper end face of the main reduction gear 101 is pressed by the gland 62 through a sealing ring, and the lower end face is pressed by the lower shield 3 through a sealing ring, clamping the main reduction gear 101 between the upper shield 6 and the lower shield 3, and pressing the end face of the main reduction gear 101 with a sealing ring to avoid collision wear caused by vibration to the end face of the main reduction gear 101 during the gear grinding process. At the same time, the sealing ring can also play a damping role to further reduce the vibration of the main reduction gear 101, improve the stability of the differential housing assembly during gear grinding, improve the gear grinding accuracy, and effectively reduce the tooth surface vibration marks during gear grinding.

[0034] Among them, a positioning groove 611 is opened on the bottom surface of the shield base body 61, the gland 62 fits into the positioning groove 611 with a clearance, bolts are installed on the gland 62, screw holes 612 matching the bolts are opened on the shield base body 61, and a spring three 9 is sleeved on the bolts. The bolts are screwed tightly into the screw holes 612 to compress the spring three 9. The gland 62 extending into the positioning groove 611 forms a radial positioning between the gland 62 and the shield base body 61. The bolts sleeved with the spring three 9 are screwed into the screw holes 612 to coaxially connect the gland 62 and the shield base body 61. The spring three 9 slows down the vibration transmitted from the main reduction gear 100, further reduces the vibration of the main reduction gear 101, improves the stability of the differential housing assembly during gear grinding, improves the gear grinding accuracy, and effectively reduces the tooth surface vibration marks during gear grinding.

[0035] Among them, a pressure rod 621 arranged axially is installed on the gland 62, a pressure rod hole 613 corresponding to the pressure rod 621 is opened on the shield base body 61, and the pressure rod 621 extends into the pressure rod hole 613. The cooperation between the pressure rod 621 and the pressure rod hole 613 enables the bolts sleeved with the spring three 9 to quickly align with the screw holes 612 when the gland 62 and the shield base body 61 are assembled, improving the assembly convenience of the upper shield 6.

[0036] When the gear grinding fixture of the new energy reduction gearbox differential housing assembly holds the differential housing assembly, the base of the gear grinding machine clamps the clamping base 1, the tailstock interface of the gear grinding machine base is connected to the upper friction cone main body 51 and moves downward, so that the upper clamping part and the lower clamping part clamp the differential housing assembly, and then the main reduction gear is subjected to gear grinding. After the processing is completed, the tailstock of the gear grinding machine base moves upward to synchronously move the upper friction cone top 5 and the upper shield 6 upward to separate from the differential housing assembly. Then, the ejector rod of the gear grinding machine base is started to jack up the support rod 82 upward, so that the pressure head 83 forms a hard contact with the support rod 83, and continues to jack up to jack up the differential housing assembly upward to separate from the cemented carbide cone one 42, and then the differential housing assembly is removed to complete the gear grinding of the differential housing assembly.

[0037] The technical solutions of the embodiments of the present utility model have been completely described in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the scope of protection of the present utility model.

Claims

1. Gear grinding fixture for the differential case assembly of a new energy speed reducer, characterized in that: It includes a lower clamping member and an upper clamping member located directly above the lower clamping member. The differential housing assembly is clamped between the upper clamping member and the lower clamping member. The characteristics are as follows: The lower clamping member includes a clamping base that can be clamped on the base of the gear grinding machine, a support seat coaxially fixed on the top of the clamping base, a lower shield coaxially fixed on the top of the support seat, and a lower friction cone assembly elastically supported on the support seat and located in the lower shield. The upper clamping member includes an upper friction cone top that can be connected to the tailstock interface of the gear grinding machine and an upper shield coaxially fixed to the upper friction cone top. The main reduction gear of the differential housing assembly is clamped between the lower shield and the upper shield. The upper end of the differential housing of the differential housing assembly extends into the upper shield and abuts against the upper friction cone top, and the lower end of the differential housing of the differential housing assembly extends into the lower shield and abuts against the lower friction cone assembly.

2. The gear grinding fixture for the differential case assembly of the new energy speed reducer according to claim 1, wherein: The lower shield has a flared shape that flares upward. The top of the lower shield presses the lower end face of the main reduction gear through a sealing ring. A spring positioning blind hole is provided on the bottom surface of the lower shield, and a spring positioning groove corresponding to the spring positioning blind hole is provided on the support seat. A compressed spring one is clamped between the spring positioning blind hole and the spring positioning groove.

3. The gear grinding fixture for the differential case assembly of the new energy speed reducer according to claim 1, characterized in that: The lower friction cone assembly includes a lower friction cone main body coaxially fixed on the support seat, a cemented carbide cone one press-fitted into the top opening of the lower friction cone main body with an interference fit, and a lower center point elastically supported on the support seat. The lower friction cone main body is provided with a through hole along the central axis. The lower center point is inserted into the through hole with a clearance fit and axially positioned by a screw in the lower friction cone main body. The top of the lower center point is conical and abuts against the inner edge of the lower end of the differential housing. The cemented carbide cone one is located on the outer periphery of the lower center point, and its inner wall is conical and abuts against the outer edge of the lower end of the differential housing.

4. The gear grinding fixture for the differential housing assembly of the new energy speed reducer according to claim 3, characterized in that: An elastic strut assembly is fixed on the support seat and cooperates with the bottom of the lower center point. The elastic strut assembly includes a plug coaxially fixed at the bottom of the support seat, a strut movably arranged in the plug, a pressure head cooperating with the bottom end of the lower center point, and a spring two that supports the pressure head directly above the strut. The outer diameter of the lower half section of the strut is smaller than that of the upper half section, and the lower half section of the strut extends downward into the clamping base.

5. The gear grinding fixture for the differential case assembly of the new energy speed reducer according to claim 4, characterized in that: A top surface groove is provided on the top surface of the strut, and a bottom surface groove is provided on the bottom surface of the pressure head. The spring two is clamped between the top surface groove and the bottom surface groove, so that the top surface of the strut is separated from the bottom surface of the pressure head and does not contact. The top of the pressure head is aligned with the bottom of the lower center point along the central axis and is in contact and cooperation.

6. The gear grinding fixture for the differential case assembly of the new energy speed reducer according to claim 1, characterized in that: The upper friction cone top includes an upper friction cone main body that can be connected to the tailstock interface of the gear grinding machine and a cemented carbide cone two press-fitted into the bottom opening of the upper friction cone main body with an interference fit. The inner wall of the cemented carbide cone two is conical and abuts against the outer edge of the upper end of the differential housing.

7. The gear grinding fixture for the differential housing assembly of the new energy speed reducer according to claim 6, characterized in that: The upper shield includes a shield base body coaxially fixed to the upper friction cone main body and a pressing cover coaxially fixed at the bottom of the shield base body. The bottom of the pressing cover presses the upper end face of the main reduction gear teeth through a sealing ring.

8. The gear grinding fixture for the differential housing assembly of the new energy reduction gearbox according to claim 7, characterized in that: A positioning groove is provided on the bottom surface of the shield base body. The pressing cover is inserted into the positioning groove with a clearance fit. A bolt is installed on the pressing cover, and a screw hole cooperating with the bolt is provided on the shield base body. A spring three is sleeved on the bolt, and the bolt is tightened in the screw hole to compress the spring three.

9. The gear grinding fixture for the differential case assembly of the new energy speed reducer according to claim 8, wherein: An axially arranged pressing rod is installed on the pressing cover, and a pressing rod hole corresponding to the pressing rod is provided on the shield base body. The pressing rod extends into the pressing rod hole.

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