Speed ​​reduction belt differential assembly

Abstract

The name of the present invention is a speed reduction belt differential assembly. It belongs to the field of automobile axle technology. It mainly solves the problems of existing hyperbolic bevel gear reducers and involute bevel gear differentials, such as large size, large weight, not conducive to lightweight, and large processing and assembly difficulties. Its main features are: a differential assembly including a differential left housing, a differential right housing, planetary gears, half-axle gears, a straight shaft, a first end face bearing, a second end face bearing, a needle bearing, and a first connecting bolt; a speed reducer assembly including a speed reducer right housing, a sun gear, a planetary gear, a first ball bearing, a hollow straight shaft, a second ball bearing, and a third ball bearing; the speed reducer assembly and the differential assembly are connected by a second connecting bolt to form a speed reduction belt differential assembly. The present invention has the characteristics of small size, simple and compact structure, improved transmission efficiency, easy to achieve reasonable use of space, easy to achieve lightweight and convenient assembly, and is mainly used in electric vehicles.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile axles, and in particular relates to a speed reduction belt differential assembly which integrates a speed reducer and a differential into one. Background Art

[0002] Traditional automobile axles and main reducers generally use a combination of a hyperbolic bevel gear reducer and an involute bevel gear differential. The size of the hyperbolic bevel gear and the involute bevel gear is large, which is not conducive to vehicle layout; their own weight is large, which is not conducive to lightweight; the processing and assembly are difficult and the cost is high. Summary of the invention

[0003] The purpose of the present invention is to provide a speed reduction belt differential assembly with small size, compact structure, convenient assembly, reduced cost and reasonable space utilization in view of the above-mentioned deficiencies.

[0004] The technical solution of the present invention is: a speed reduction belt differential assembly, characterized in that: it includes a differential left case, a differential right case, planetary gears, half-axle gears, a straight shaft, a first end face bearing, a second end face bearing, a needle bearing, and a first connecting bolt; it includes a speed reducer assembly including a speed reducer right case, a sun gear, a planetary gear, a first ball bearing, a hollow straight shaft, a second ball bearing, and a third ball bearing; the planetary gears, half-axle gears, a straight shaft, a first end face bearing, a second end face bearing, and a needle bearing are installed inside the differential left case and the differential right case to form a differential assembly; the sun gear, planetary gears, a first ball bearing, a hollow straight shaft, a second ball bearing, and a third ball bearing are assembled inside the speed reducer right case to form a speed reducer assembly; the speed reducer assembly and the differential assembly are connected by a second connecting bolt to form a speed reduction belt differential assembly.

[0005] The needle bearing described in the technical solution of the present invention is installed in the planetary gear, the first end face bearing is installed at both ends of the planetary gear, and the straight shaft installs the needle bearing, the planetary gear and the first end face bearing in the middle of the left differential case and the right differential case; the half-shaft gears and the second end face bearing are alternately installed inside the left differential case and the right differential case; the left differential case and the right differential case are fixedly connected by the first connecting bolt.

[0006] The second ball bearing and the third ball bearing described in the technical solution of the present invention are pressed onto the right housing of the reducer; the sun gear is pressed into the second ball bearing; the first ball bearing is pressed into the planetary gear, and the hollow straight shaft connects the first ball bearing to the right housing of the reducer.

[0007] The right housing of the differential described in the technical solution of the present invention is provided with a hollow straight shaft positioning hole, and the front end of the hollow straight shaft extends into the hollow straight shaft positioning hole; the right housing of the differential and the right housing of the reducer are provided with matching positioning pin holes, and positioning pins are installed in the positioning pin holes; the right housing of the differential and the right housing of the reducer are fixedly connected by a second connecting bolt.

[0008] The present invention integrates the differential assembly and the reducer assembly into one, realizing the function of the reducer and the differential function at the same time. Compared with the prior art, the present invention adopts cylindrical gears to replace the hyperbolic bevel gears and the involute bevel gears, and the right housing of the differential and the left housing of the reducer are integrated into one, which reduces the number of parts, reduces the difficulty of processing and assembly, and reduces the cost. It has the characteristics of small size, simple and compact structure, high transmission efficiency, easy to realize reasonable use of space, easy to realize lightweight and convenient assembly. The present invention is mainly used in electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the reducer assembly of the present invention.

[0010] Figure 2 It is a schematic diagram of the differential assembly of the present invention.

[0011] Figure 3 The figure is a schematic diagram of the speed reduction belt differential assembly of the present invention.

[0012] In the figure: 1-right housing of reducer, 2-sun gear, 3-planet gear, 4-first ball bearing, 5-hollow straight shaft, 6-second ball bearing, 7-third ball bearing; 8-left housing of differential, 9-right housing of differential, 10-semi-axle gear, 11-planet gear, 12-straight shaft, 13-first end bearing, 14-needle bearing; 15-second end bearing; 16-first connecting bolt; A-differential assembly; B-reducer assembly; 17-second connecting bolt; 18-locating pin. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown. A speed reducer assembly B of a speed reducer differential assembly of the present invention comprises a speed reducer right housing 1, a sun gear 2, a planetary gear 3, a first ball bearing 4, a hollow straight shaft 5, a second ball bearing 6 and a third ball bearing 7. The sun gear 2, the planetary gear 3, the first ball bearing 4, the hollow straight shaft 5, the second ball bearing 6 and the third ball bearing 7 are assembled inside the speed reducer right housing 1 to form the speed reducer assembly B. The second ball bearing 6 and the third ball bearing 7 are press-fitted on the speed reducer right housing 1, and the sun gear 2 is press-fitted in the second ball bearing 6; the first ball bearing 4 is press-fitted in the planetary gear 3, and the hollow straight shaft 5 connects the first ball bearing 4 to the speed reducer right housing 1.

[0015] like Figure 2 The differential assembly A of the speed reduction belt differential assembly of the present invention comprises a differential left case 8, a differential right case 9, a half-axle gear 10, a planetary gear 11, a straight shaft 12, a first end face bearing 13, a needle bearing 14, a second end face bearing 15 and a first connecting bolt 16. The planetary gear 11, the half-axle gear 10, the straight shaft 12, the first end face bearing 13, the second end face bearing 15 and the needle bearing 14 are installed inside the differential left case 8 and the differential right case 9 to form the differential assembly A. The needle bearing 14 is installed in the planetary gear 11, the first end bearing 13 is installed at both ends of the planetary gear 11, and the straight shaft 12 installs the planetary gear assembly consisting of the needle bearing 14, the planetary gear 11 and the first end bearing 13 between the left differential case 8 and the right differential case 9. The half-shaft gears 10 and the second end bearing 15 are alternately installed inside the left differential case 8 and the right differential case 9. The left differential case 8 and the right differential case 9 are fixedly connected by the first connecting bolts 16 to form a complete differential assembly A.

[0016] like Figure 3 As shown. The half-axle gear 10 of the differential assembly A corresponds to the sun gear 2 of the reducer assembly B. The right differential housing 9 is provided with a hollow straight shaft positioning hole, and the front end of the hollow straight shaft 5 extends into the hollow straight shaft positioning hole. The right differential housing 9 and the right reducer housing 1 are provided with matching positioning pin holes, and the positioning pin holes are equipped with positioning pins 18. The right differential housing 9 and the right reducer housing 1 are fixedly connected by the second connecting bolt 17. The differential assembly A and the reducer assembly B form a speed reduction belt differential assembly through the second connecting bolt 17 and the positioning pin 18.

Claims

1. A speed reduction belt differential assembly for an electric vehicle, characterized in that: A differential assembly (A) comprising a differential left case (8), a differential right case (9), planetary gears (11), half-axle gears (10), a straight shaft (12), a first end face bearing (13), a second end face bearing (15), a needle bearing (14), and a first connecting bolt (16); a reducer assembly (B) comprising a reducer right case (1), a sun gear (2), planetary gears (3), a first ball bearing (4), a hollow straight shaft (5), a second ball bearing (6), and a third ball bearing (7); the planetary gears (11), half-axle gears (10), a straight shaft (12), a first end face bearing (13), a second end face bearing (15), and a needle bearing (14) are installed inside the differential left case (8) and the differential right case (9) to form the differential assembly (A); the sun gear (2), The planetary gear (3), the first ball bearing (4), the hollow straight shaft (5), the second ball bearing (6), and the third ball bearing (7) are assembled inside the right housing (1) of the reducer to form a reducer assembly (B); the needle bearing (14) is installed in the planetary gear (11), the first end bearing (13) is installed at both ends of the planetary gear (11), and the straight shaft (12) installs the needle bearing (14), the planetary gear (11) and the first end bearing (13) between the left housing (8) and the right housing (9) of the differential; the half-shaft gear (10) and the second end bearing (15) are alternately installed inside the left housing (8) and the right housing (9) of the differential; the left housing (8) and the right housing (9) of the differential are fixedly connected by a first connecting bolt (16); the right housing (9) of the differential A hollow straight shaft positioning hole is provided on the right housing (9) of the reducer, and the front end of the hollow straight shaft (5) extends into the hollow straight shaft positioning hole; the right housing (9) of the differential and the right housing (1) of the reducer are provided with matching positioning pin holes, and the positioning pin holes are equipped with positioning pins (18); the right housing (9) of the differential and the right housing (1) of the reducer are fixedly connected by a second connecting bolt (17); the second ball bearing (6) and the third ball bearing (7) are press-fitted on the right housing (1) of the reducer; the sun gear (2) is press-fitted in the second ball bearing (6); the first ball bearing (4) is press-fitted in the planetary gear (3), and the hollow straight shaft (5) connects the first ball bearing (4) to the right housing (1) of the reducer; the reducer assembly (B) and the differential assembly (A) form a speed reduction belt differential assembly by means of a second connecting bolt (17) and a positioning pin (18); the half-shaft gear (10) is a cylindrical gear.

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