CN210003772U

CN210003772U - Differential case and differential

Info

Publication number: CN210003772U
Application number: CN201920809572.2U
Authority: CN
Inventors: 向用均; 胡礼; 陈海; 蒲吕春; 胡少洪; 原磊
Original assignee: JIANAN INDUSTRY Co Ltd SICHUAN PROV
Current assignee: JIANAN INDUSTRY Co Ltd SICHUAN PROV
Priority date: 2019-05-30
Filing date: 2019-05-30
Publication date: 2020-01-31
Anticipated expiration: 2029-05-30

Abstract

The utility model discloses a differential mechanism shells and differential mechanism relates to the automotive filed, solves the easy stress concentration of current differential mechanism shell in the opening face position, problem that the fracture risk is high, the technical scheme that the utility model discloses a differential mechanism shell, including the casing, set up two openings that are used for installing the capable semi-gear on the casing, the opening is planetary gear ball center normal direction opening form, the opening forms annular opening face on the casing, the upside and the left and right sides of opening face and the circumference normal direction mutually perpendicular of corresponding position the opening is planetary gear ball center normal direction opening form, make the turn round intensity maximize of differential mechanism casing, through the structure that improves the differential mechanism casing, avoid the concentration of stress with the stress homogenization, and considered the installation needs of capable semi-gear, promoted its intensity and rigidity, avoided stress concentration effectively and reduced the fracture risk.

Description

Differential case and differential

Technical Field

The utility model relates to an automotive filed, concretely relates to differential mechanism.

Background

The differential mechanism of the automobile is a mechanism which can enable left and right or front and rear driving wheels to rotate at different rotating speeds. The differential mechanism mainly comprises a differential mechanism shell, a left half axle gear, a right half axle gear, two planetary gears and a gear carrier, and has the function of enabling left and right wheels to roll at different rotating speeds when the automobile turns or runs on an uneven road surface, namely ensuring that the wheels are driven by two sides to do pure rolling motion. The differential case is a main structural component for transmitting driving force to the driving wheel in two-wheel drive or four-wheel drive, and the reasonability of the structural design is directly related to the reliability and the service life of an automobile driving axle.

When the differential mechanism transmits output torque, the differential mechanism bears all output loads, so that the differential mechanism shell has extremely high requirements on structural strength and rigidity, and if an unreasonable place is arranged on the whole or part of the structure, the differential mechanism shell is directly cracked, and driving safety is affected. Under the forward-towing and backward-towing working conditions when the engine outputs the maximum torsion, the differential bears the maximum torque load. The differential case, as a planetary carrier, needs to have sufficient bending resistance rigidity and strength to effectively transmit the torque to the drive wheel.

The differential case is provided with openings for mounting the row half gears, and the openings form an annular opening surface on the differential case, as shown in fig. 1-2. The existing opening is processed in a flat cutting mode, the opening is in a parallel opening form, and the strength of the differential shell at the opening face is suddenly changed, so that the problem of overlarge stress easily generated at the position below the opening face is solved, and the cracking failure is caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses at first provide kinds of differential shells, solve current differential shell stress concentration easily in the position of opening face, the problem that the fracture risk is high.

The utility model provides a technical scheme that its technical problem adopted is: the differential shell comprises a shell, wherein two openings for mounting the row half gears are formed in the shell, the openings are in a form of opening in the center of a planet gear sphere in a normal direction, annular opening surfaces are formed in the openings in the shell, and the upper side and the left side and the right side of each opening surface are perpendicular to the direction of a circumferential normal line of a corresponding position.

Further , the upper and left sides of the opening can extend to meet at point further is where the upper and left sides of the two opening planes on the housing can extend to meet at point.

Step is rounding the edges of the open face.

Specifically, the method comprises the following steps: the angle between the left and right sides of the opening face is 94.3 °.

The utility model discloses still provide differential mechanism, including the differential mechanism shell, the differential mechanism shell is selected for use above-mentioned differential mechanism shell wanting.

The utility model has the advantages that: the opening is in a form of a normal opening of a planet gear center, so that the bending strength of the differential shell with the opening is maximized, the stress is homogenized by improving the structure of the differential shell, the stress concentration is avoided, the installation requirement of the row half gear is considered, the strength and the rigidity of the differential shell are improved, the stress concentration is effectively avoided, and the cracking risk is reduced.

The edge of the opening surface is chamfered, so that stress concentration of sharp corners is avoided, stress of the root of the opening and the stress of the part near the seam allowance are greatly reduced, and the overall strength and the safety factor of the differential case are improved.

Drawings

Fig. 1 is a structural view of a conventional differential case.

Fig. 2 is a side view of fig. 1.

Fig. 3 is a schematic perspective view of the differential case of the present invention.

Fig. 4 is a cross-sectional view of fig. 3.

Fig. 5 is a longitudinal sectional view of fig. 3 taken along a center line of the opening.

Fig. 6 is a top view of fig. 3.

Fig. 7 is a sectional view taken along the direction a-a in fig. 6.

Parts, positions and numbers in the drawings: opening 1, opening surface 2, circumference normal 3, lofting cut-out area 4.

Detailed Description

The present invention will be further described in with reference to the following drawings.

As shown in figures 3-7, the utility model discloses differential case, including the casing, set up two openings 1 that are used for installing the row's half-gear on the casing, opening 1 is planetary gear centre of sphere normal direction opening form, and opening 1 forms annular opening face 2 on the casing promptly, and opening face 2 divides into upper and lower side and left and right sides according to the position, and the upper and lower side of opening 1 is the upper and lower side of opening face 2 in figure 3. the upper side and the left and right sides of opening face 2 are mutually perpendicular with the 3 directions of the circumference normal line 3 of corresponding position, as shown in figure 3. opening face 2 forms for cutting off part on the casing, and the part that needs to cut off is marked as lofting excision district 4, as shown in figures 4-7.

The lower side of the opening surface 2 is restricted by the installation of the half gear and the driven gear, and the lower side of the opening surface 2 is not perpendicular to the direction of the circumferential normal 3 of the corresponding position, namely, the position corresponding to the angle at the lowest side of the lofting and cutting area 4 in a triangular shape in fig. 5 is the lower side of the opening surface 2.

The upper and left sides of the opening face 2 may extend to intersect at a point , which is located on the longitudinal axis of the housing, the two openings 1 of the housing are symmetrically arranged so that the upper and left sides of the two opening faces 2 may extend to intersect at the same point , as shown in fig. 4, the angle of the openings 1 is set to ensure the maximum angle of the row half gear assembly width, i.e., the angle between the left and right sides of the opening face 2 is set to ensure the maximum angle of the row half gear assembly width, for example, the angle between the left and right sides of the opening face 2 is 94.3, as shown in fig. 4.

The edge of the opening surface 2 is chamfered, namely the edge of the opening surface 2 is subjected to fillet smoothing treatment, so that stress concentration structures such as sharp corners are avoided, and the stress near the root part and the spigot of the opening is reduced.

The utility model discloses an in addition theme is differential mechanism, including the differential mechanism shell, the differential mechanism shell chooses for use above-mentioned differential mechanism shell, the differential mechanism is in the intensity improvement condition under positive and negative each operating mode of dragging, and the orthogonal structure meets 190 MPa's fatigue limit requirement more than the average decline of easy fracture department stress, and all other positions all satisfy 320MPa limit requirements simultaneously.

Claims

1. Differential case, including the casing, set up two openings (1) that are used for installing row's half-gear on the casing, its characterized in that: the opening (1) is in a form of opening in the center normal direction of the planet gear ball, the opening (1) forms an annular opening surface (2) on the shell, and the upper side and the left and right sides of the opening surface (2) are perpendicular to the directions of the circumferential normal line (3) of the corresponding position.

2. A differential carrier case according to claim 1, wherein the upper side and the left and right sides of the opening surface (2) may extend to intersect at point .

3. A differential carrier housing according to claim 2, wherein the upper and left and right sides of the two open surfaces (2) of the housing are extendable to meet at the same point .

4. A differential carrier housing according to claim 1, 2 or 3, wherein: the edge of the opening surface (2) is rounded.

5. A differential carrier housing according to claim 4, wherein: the angle between the left and right sides of the opening surface (2) is 94.3 degrees.

6. A differential gear comprises a differential case, and is characterized in that the differential case is the differential case as claimed in any of claims 1-5.