High-efficiency low-friction inter-axle differential structure assembly

Abstract

The utility model discloses a high-efficiency low-friction inter-axle differential structure assembly, which is characterized by consisting of a cross axle, a needle bearing, a planet wheel, a spacer ring, a driving cylindrical gear, a driving cylindrical gear bushing, an input shaft, a rear half axle wheel, a rear half axle wheel bushing, a rear half axle wheel bearing, a middle axle reduction shell and an axle difference shell with an oil retainer assembly, compared with a traditional structure, a needle bearing is additionally arranged between a planet wheel and a cross shaft, sliding friction is changed into rolling friction, the problems of heavy abrasion and large internal friction of original sliding friction are effectively solved, and the transmission efficiency of a main speed reducer assembly is obviously improved while the fault that an inter-shaft differential assembly is prone to abrasion is reduced; in addition, axial limiting parts are arranged on the end faces of the two sides of the needle bearing, the working position of the needle bearing is effectively guaranteed, and the needle bearing can better play a role in reducing abrasion and improving efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy truck axles, in particular to a high-efficiency and low-friction inter-axle differential structure assembly. Background Art

[0002] The inter-axle differential assembly is an important component of the main reducer assembly on the middle axle of the 6×4 vehicle drive axle. It is used to receive the torque from the input shaft and transmit the torque to the cylindrical gear and the through shaft, and perform the differential function between the cylindrical gear and the through shaft to ensure the normal driving of the vehicle.

[0003] In the traditional inter-axle differential assembly structure, the planetary gear and the cross shaft are usually matched through the shaft hole, and the planetary gear is directly assembled on the cross shaft, and there is sliding friction between the two. During normal driving of the vehicle, the inter-axle differential always plays a differential role, that is, while the planetary gear revolves with the cross shaft and the input shaft, it also always maintains its own rotation, so the planetary gear is always in sliding friction with the cross shaft. The existence of this sliding friction significantly increases the internal friction of the inter-axle differential, increases the power loss of the inter-axle differential and even the entire main reducer assembly, and reduces the efficiency of the axle assembly. At the same time, this sliding friction is prone to cause internal wear failures in the inter-axle differential, increases the failure points of the entire axle and the entire vehicle, and also reduces the cleanliness of the gear oil, affecting the life of the bearings and gears. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art and provide a high-efficiency and low-friction inter-axle differential structure assembly.

[0005] The technical solution provided by the utility model is: a high-efficiency and low-friction inter-axle differential structure assembly, which is special in that it is composed of a cross shaft, a needle bearing, a planetary gear, a spacer ring, a driving cylindrical gear, a driving cylindrical gear bushing, an input shaft, a rear half-axle wheel, a rear half-axle wheel bushing, a rear half-axle wheel bearing, a middle bridge reduction housing and an axle differential housing with an oil retaining ring assembly; the inner diameter of the cross shaft is the same as the outer diameter of the cross shaft matching position of the input shaft, and after the two are assembled, the input shaft drives the cross shaft to rotate freely; the outer diameter of the rear half-axle wheel bushing is the same as the inner diameter of the bushing installation position of the rear half-axle wheel, and the two are assembled and fixed together; the inner diameter of the rear half-axle wheel bushing is the same as the outer diameter of the rear half-axle wheel matching position of the input shaft, and the two are connected through the shaft The holes are fitted together to realize the free rotation of the rear half-shaft wheel and the rear half-shaft wheel bushing on the input shaft; the outer diameter of the bearing installation position of the rear half-shaft wheel is the same as the inner diameter of the bearing inner ring of the rear half-shaft wheel bearing, and the two are fixed together by the shaft hole fitting and the parallel end faces of the rear half-shaft wheel and the bearing inner ring; the outer diameter of the bearing outer ring of the rear half-shaft wheel bearing is the same as the inner diameter of the middle bridge reduction housing bearing installation position, and the two are fixed together by the shaft hole fitting and the parallel end faces of the bearing outer ring and the middle bridge reduction housing, and the rear half-shaft wheel rotates freely on the middle bridge reduction housing through the rear half-shaft wheel bearing; the bevel gear modules of the rear half-shaft wheel and the planetary wheel are equal, the pitch cone angles are complementary, the axis center lines are perpendicular to each other and the pitch cone points coincide, and the meshing together realizes a straight The bevel teeth of the gears mesh with each other and rotate relative to each other; the outer diameter of the driving cylindrical gear bushing is the same as the inner diameter of the bushing installation position of the driving cylindrical gear, and the two are assembled and fixed together through the interference fit of the shaft hole; the inner diameter of the driving cylindrical gear bushing is the same as the outer diameter of the driving cylindrical gear matching position of the input shaft, and the two are assembled together through the shaft hole matching to realize the free rotation of the driving cylindrical gear and the driving cylindrical gear bushing on the input shaft; the bevel modules of the driving cylindrical gear and the planetary gear are equal, the pitch cone angles are complementary, the axis center lines are perpendicular to each other and the pitch cone points coincide, and the meshing together realizes the mutual meshing and relative rotation relationship of the straight bevel teeth; the upper end face of the rear half shaft wheel is parallel to the corresponding shoulder face of the input shaft, and the two The two are pressed against each other to realize the axial limit of the input shaft, and the two rotate relative to each other; the spherical inner diameter of the shaft difference housing with the oil retaining ring assembly is the same as the spherical outer diameter of the planetary gear, and the two are assembled together through the spherical inner and outer diameters; the inner diameter of the planetary gear is the same as the outer diameter of the needle bearing, the outer diameter of the cross shaft is the same as the inner diameter of the needle bearing, the cross shaft, the needle bearing and the planetary gear are assembled and connected together, and the planetary gear rotates freely on the cross shaft through the needle bearing; the inner diameter of the spacer ring is the same as the shaft diameter of the cross shaft, the two are assembled together, and the end faces of both sides of the spacer ring are respectively pressed against the cross shaft and the needle bearing, realizing the unilateral axial limit of the needle bearing; an inner hole retaining edge is arranged in the planetary gear.

[0006] Furthermore, the cross shaft and the input shaft are radially limited by spline cooperation.

[0007] Furthermore, the number of the planetary gears and the number of the needle roller bearings are both 4.

[0008] Furthermore, the number of the spacer rings is 4.

[0009] Furthermore, the inner hole rib limits the axial position of the other side of the needle roller bearing.

[0010] Furthermore, the rear half-axle wheel bushing and the rear half-axle wheel are assembled and fixed together through interference fit of the shaft hole.

[0011] Furthermore, the driving cylindrical gear adjusts the meshing clearance between the differential half shaft and the planetary gear through the thrust washer abutting against the driving cylindrical gear in the axial direction.

[0012] The beneficial effects of the utility model are: 1. A needle roller bearing is added between the planetary gear and the cross shaft, and the sliding friction is changed into rolling friction, which effectively solves the problems of heavy wear and large internal friction of the original sliding friction, and at the same time reduces the easy wear failure of the shaft difference assembly, and significantly improves the transmission efficiency of the main reducer assembly; 2. Axial limiters are set on the end faces on both sides of the needle roller bearing, which effectively ensures the working position of the needle roller bearing, so that it can better play the role of reducing wear and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] In the figure, 1, cross shaft, 2, needle bearing, 3, planetary gear, 4, spacer ring, 5, driving cylindrical gear, 6, driving cylindrical gear bushing, 7, input shaft, 8, rear half shaft wheel, 9, rear half shaft wheel bushing, 10, rear half shaft wheel bearing, 11, middle bridge reduction housing, 12, shaft difference housing with oil retaining ring assembly, 31, inner hole retaining edge. DETAILED DESCRIPTION

[0015] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0016] like Figure 1As shown, a high-efficiency and low-friction inter-axle differential structure assembly is composed of a cross shaft 1, a needle bearing 2, a planetary gear 3, a spacer ring 4, a driving cylindrical gear 5, a driving cylindrical gear bushing 6, an input shaft 7, a rear half shaft wheel 8, a rear half shaft wheel bushing 9, a rear half shaft wheel bearing 10, a middle bridge reduction housing 11 and an axle differential housing with an oil retaining ring assembly 12; the inner diameter of the cross shaft 1 is processed to be the same as the outer diameter of the cross shaft matching position of the input shaft 7, and the two are assembled together through spline matching, and the input shaft 7 can drive the cross shaft 1 to rotate freely; the inner diameter of the planetary gear 3 is processed to be the same as the outer diameter of the needle bearing 2, and the outer diameter of the cross shaft 1 is processed to be the same as the inner diameter of the needle bearing 2, and the three are assembled and connected together, and the planetary gear 3 can be connected to the cross shaft through the needle bearing 2 1, and the number of planetary gears 3 and needle bearings 2 are both 4; the inner diameter of the spacer ring 4 is processed to be the same as the shaft diameter of the cross shaft 1, and the two are assembled together, and the end faces of the spacer ring 4 are respectively against the cross shaft 1 and the needle bearing 2, so as to realize the unilateral axial limit of the needle bearing 2, and the number of the spacer ring 4 is 4; the planetary gear 3 is processed to set the inner hole rib 31, which is used for the axial limit of the other side of the needle bearing 2; the outer diameter of the rear half shaft wheel bushing 9 is processed to be the same as the inner diameter of the bushing installation position of the rear half shaft wheel 8, and the two are assembled and fixed together through the interference fit of the shaft hole; the inner diameter of the rear half shaft wheel bushing 9 is processed to be the same as the outer diameter of the rear half shaft wheel matching position of the input shaft 7, and the two are assembled together through the shaft hole matching, so as to realize the rear half The axle wheel 8 together with the rear half-axle wheel bushing 9 rotates freely on the input shaft 7; the outer diameter of the bearing installation position of the rear half-axle wheel 8 is processed to be the same as the inner diameter of the bearing inner ring of the rear half-axle wheel bearing 10, and the two are fixed together through the shaft hole matching and the parallel end faces of the rear half-axle wheel 8 and the bearing inner ring; the outer diameter of the bearing outer ring of the rear half-axle wheel bearing 10 is processed to be the same as the inner diameter of the bearing installation position of the middle bridge reduction housing 11, and the two are fixed together through the shaft hole matching and the parallel end faces of the bearing outer ring and the middle bridge reduction housing 11. At this point, the rear half-axle wheel 8 can rotate freely on the middle bridge reduction housing 11 through the rear half-axle wheel bearing 10; the rear half-axle wheel 8 is processed to have the same bevel gear module as the planetary wheel 3, the pitch cone angles are complementary, the axis lines are perpendicular to each other and the pitch cone points coincide, so that the meshing The outer diameter of the driving cylindrical gear bushing 6 is processed to be the same as the inner diameter of the bushing installation position of the driving cylindrical gear 5, and the two are assembled and fixed together through the interference fit of the shaft hole; the inner diameter of the driving cylindrical gear bushing 6 is processed to be the same as the outer diameter of the driving cylindrical gear matching position of the input shaft 7, and the two are assembled together through the shaft hole matching, so that the free rotation of the driving cylindrical gear 5 and the driving cylindrical gear bushing 6 on the input shaft 7 is realized; like the rear half-axle wheel 8, the driving cylindrical gear 5 is processed to have the same bevel module as the planetary gear 3, the pitch cone angles are complementary, the axis lines are perpendicular to each other and the pitch cone points coincide, so that the meshing together realizes the mutual meshing and relative rotation relationship of the straight bevel teeth;The upper end surface of the rear half-axle wheel 8 is processed to be parallel to the corresponding shoulder surface of the input shaft 7, and the two are assembled and pressed together to realize the axial limit of the input shaft 7, and the two can rotate with each other; the spherical inner diameter of the shaft differential housing with oil retaining ring assembly 12 is processed to be the same as the spherical outer diameter of the planetary wheel 3, and the two are assembled together through the spherical inner and outer diameters; the driving cylindrical gear 5 realizes the meshing clearance adjustment of the differential half-axle and the planetary gear through the thrust washer pressed against it axially, so that this inter-axle differential structure assembly is formed. ;

[0017] The utility model discloses a high-efficiency and low-friction inter-axle differential structure assembly. When working, the input shaft 7 receives the torque transmitted by the gearbox and the transmission shaft, and rotates freely under the support of the input shaft front bearing and the rear half-axle wheel bearing 10, and drives the cross shaft 1 to rotate accordingly; the cross shaft 1 is equipped with a planetary gear 3, a needle bearing 2 and a spacer ring 4, and the axial limit of the planetary gear 3 is achieved due to the existence of the shaft difference housing with the oil retaining ring assembly 12. In this way, the planetary gear 3 not only rotates on the cross shaft 1, but also revolves with the cross shaft 1 and the input shaft 7; the driving cylindrical gear 5 and the rear half-axle wheel 8 are respectively matched with the planetary gear 3 by bevel gears to form a differential structure; so far, when the planetary gear 3 does not rotate on itself, the driving cylindrical gear 5 and the rear half-axle wheel 8 have the same rotation speed as the input shaft 7 When the planetary gear 3 rotates, the rotation speeds of the driving cylindrical gear 5 and the rear half-axle wheel 8 are different from those of the input shaft 7, thus realizing the differential function of the differential; and the anti-rotation limit boss of the shaft differential housing on the driving cylindrical gear 5 limits the rotation swing of the shaft differential housing with the oil retaining ring assembly 12 suspended on the planetary gear 3, thus avoiding the interference between the operation of the oil retaining ring and the adjacent parts, and enabling the oil retaining ring to better play the role of collecting oil; since a needle roller bearing is added between the planetary gear and the cross shaft, the original sliding friction is converted into rolling friction, which significantly improves the high wear and high internal friction problems of the original sliding friction and improves the transmission efficiency of the main reducer assembly; axial limits are set on the end faces on both sides of the needle roller bearing to ensure the stability of the working position of the needle roller bearing, so that it can better play the role of reducing wear and improving efficiency.

[0018] It should be understood that the technical features not elaborated in this specification belong to the prior art. Although the implementation methods of the utility model patent are described above in conjunction with the drawings, the utility model is not limited to the above specific implementation methods, which are only illustrative and not restrictive. Ordinary technicians in this field can make more forms under the enlightenment of the utility model without departing from the scope of protection of the purpose of the utility model and the claims, which are all within the protection scope of the utility model.

Claims

1. A high-efficiency, low-friction inter-axle differential structure assembly, characterized in that: The invention comprises a cross shaft (1), a needle bearing (2), a planetary gear (3), a spacer ring (4), a driving cylindrical gear (5), a driving cylindrical gear bushing (6), an input shaft (7), a rear half shaft wheel (8), a rear half shaft wheel bushing (9), a rear half shaft wheel bearing (10), a middle bridge reducer housing (11) and an axle difference housing with an oil retaining ring assembly (12); the inner diameter of the cross shaft (1) is the same as the outer diameter of the cross shaft matching position of the input shaft (7); after the two are assembled, the input shaft (7) drives the cross shaft (1) to rotate freely; the outer diameter of the rear half shaft wheel bushing (9) is the same as the inner diameter of the bushing installation position of the rear half shaft wheel (8); the two are assembled and fixed together; the inner diameter of the rear half shaft wheel bushing (9) is the same as the outer diameter of the rear half shaft wheel matching position of the input shaft (7); The two are assembled together through the shaft hole, so that the rear half shaft wheel (8) and the rear half shaft wheel bushing (9) can rotate freely on the input shaft (7); the outer diameter of the bearing installation position of the rear half shaft wheel (8) is the same as the inner diameter of the bearing inner ring of the rear half shaft wheel bearing (10), and the two are fixed together through the shaft hole matching and the parallel end faces of the rear half shaft wheel (8) and the bearing inner ring; the outer diameter of the bearing outer ring of the rear half shaft wheel bearing (10) is the same as the inner diameter of the bearing installation position of the middle bridge reduction housing (11), and the two are fixed together through the shaft hole matching and the parallel end faces of the bearing outer ring and the middle bridge reduction housing (11), and the rear half shaft wheel (8) can rotate freely on the middle bridge reduction housing (11) through the rear half shaft wheel bearing (10); the rear half shaft wheel (8) and the planetary wheel (3) are fixed together. The bevel gear modules are equal, the pitch cone angles are complementary, the axis centers are perpendicular to each other and the pitch cone points coincide with each other, and the meshing together realizes the mutual meshing and relative rotation relationship of the straight bevel gears; the outer diameter of the driving cylindrical gear bushing (6) is the same as the inner diameter of the bushing installation position of the driving cylindrical gear (5), and the two are assembled and fixed together through the interference fit of the shaft hole; the inner diameter of the driving cylindrical gear bushing (6) is the same as the outer diameter of the driving cylindrical gear matching position of the input shaft (7), and the two are assembled together through the shaft hole matching, so that the driving cylindrical gear (5) and the driving cylindrical gear bushing (6) can rotate freely on the input shaft (7); the bevel gear modules of the driving cylindrical gear (5) and the planetary gear (3) are equal, the pitch cone angles are complementary to each other, the axis centers are perpendicular to each other and the pitch cone points coincide with each other, and the meshing at Together, the straight bevel gears are meshed with each other and rotate relative to each other; the upper end surface of the rear half-axle wheel (8) is parallel to the corresponding shoulder surface of the input shaft (7), and the two are pressed against each other to achieve axial limitation of the input shaft (7), and the two rotate relative to each other; the spherical inner diameter of the shaft difference housing with the oil retaining ring assembly (12) is the same as the spherical outer diameter of the planetary gear (3), and the two are assembled together through the matching of the spherical inner and outer diameters; the inner diameter of the planetary gear (3) is the same as the outer diameter of the needle bearing (2), and the outer diameter of the cross shaft (1) is the same as the inner diameter of the needle bearing (2); the cross shaft (1), the needle bearing (2), and the planetary gear (3) are assembled and connected together, and the planetary gear (3) rotates freely on the cross shaft (1) through the needle bearing (2);The inner diameter of the spacer ring (4) is the same as the shaft diameter of the cross shaft (1). The two are assembled together, and the end faces of both sides of the spacer ring (4) respectively abut against the cross shaft (1) and the needle roller bearing (2), thereby realizing a single-sided axial limit for the needle roller bearing (2); the planetary gear (3) is provided with an inner hole rib (31). ; 2. The high-efficiency, low-friction inter-axle differential structure assembly according to claim 1, characterized in that: The cross shaft (1) and the input shaft (7) are radially limited by spline cooperation.

3. The high-efficiency, low-friction inter-axle differential structure assembly according to claim 1, characterized in that: The number of the planetary wheels (3) and the number of the needle roller bearings (2) are both four.

4. The high-efficiency, low-friction inter-axle differential structure assembly according to claim 1, characterized in that: The number of the spacer rings (4) is 4.

5. The high-efficiency, low-friction inter-axle differential structure assembly according to claim 1, characterized in that: The inner hole rib (31) limits the axial position of the other side of the needle roller bearing (2).

6. The high-efficiency, low-friction inter-axle differential structure assembly according to claim 1, characterized in that: The rear half-axle wheel bushing (9) and the rear half-axle wheel (8) are assembled and fixed together through interference fit of the shaft hole.

7. The high-efficiency, low-friction inter-axle differential structure assembly according to claim 1, characterized in that: The driving cylindrical gear (5) adjusts the meshing clearance between the differential half shaft and the planetary gear by means of a thrust washer abutting against the driving cylindrical gear (5) in the axial direction.

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