CN201354840Y

CN201354840Y - Right differential housing

Info

Publication number: CN201354840Y
Application number: CNU2009201263390U
Authority: CN
Inventors: 钱彻; 刘晓锋; 唐润模
Original assignee: CHONGQING MECHWEST Inc
Current assignee: CHONGQING MECHWEST Inc
Priority date: 2009-02-16
Filing date: 2009-02-16
Publication date: 2009-12-02
Anticipated expiration: 2019-02-16

Abstract

Aiming to overcome the defects of the shaft neck root of a right differential housing, such as low strength and susceptibility to fracture, the utility model discloses a right differential housing, wherein, a shaft neck, a shaft neck root and a step end surface of the right housing are subjected to the mid frequency induction hardening heat treatment which produces a hardening layer with depth ranging from 2.0 to 6.0 mm, and rigidity ranging from 45 to 52 HRC. With the damage-prone shaft neck, shaft neck root and step end surface subjected to the mid frequency induction hardening heat treatment as well as the increase in the transitional circle radius of the shaft neck root of the right differential housing which aims to reduce the stress concentration at the shaft neck root of the right differential housing, the utility model improves the mechanical property and mechanical strength at the transitional circular arc part of the shaft neck root between the right housing shaft neck and the step end surface, thereby increasing the transmitting torque and the service life of the compensating gear, and solving the problem of about one percent of compensating gears falling short of the utilization requirements of heavy duty cars.

Description

The differential right casing body

Technical field

The utility model relates to a kind of differential mechanism, especially a kind of heavy-duty car differential right casing body.

Background technique

Automobile differential is the main part that drives sedan-chair, and its effect is in the semiaxis transferring power of both sides, allows the both sides semiaxis with different rotating speed rotations, satisfies two sidecar wheels and does equidistantly not travel with the form of pure rolling as far as possible, reduces the friction on tire and ground.Differential mechanism is made up of mechanical parts such as differential left right shell body, planetary pinion, planet pin and differential gears, the power of motor enters the ransaxle differential mechanism through transmission shaft, drive planetary wheel carrier, drive left and right sides semiaxis, make left and right sidesing driving wheel with different speed rotations, to obtain good steering behaviour.But in use find have the axle journal root of the heavy-duty car driving axle differential right shell body about one of percentage easily to rupture approximately, cause bigger economic loss and serious traffic accident.Yet, because shape, structure and the size of differential mechanism are subjected to the restriction of installing environmental conditions, should not improve, be reasonable scheme so improve the mechanical strength of differential right casing axon neck; In addition, the transition arc radius less (less than 1.6mm) of existing differential right casing axon neck root causes the stress of differential right casing axon neck root to concentrate easy-rupturing.

The model utility content

Technical problem to be solved in the utility model is to improve differential right casing axon neck root mechanical property and mechanical strength.

In order to address the above problem, the technical solution of the utility model is: a kind of differential right casing body, central authorities at this right shell body are provided with the through hole that differential gear is installed, the hole wall of this through hole axially stretches out and forms the right shell body axle journal, the outer surface of this right shell body axle journal becomes 90 ° of angles with the step end face of right shell body, and the axle journal root that both intersect is an arc surface, described right shell body axle journal, axle journal root and step end face are through mid frequency induction hardening heat treatment, depth of hardening zone is 2.0～6.0mm, and hardness is 45～52HRC.

The preferred embodiment of such scheme, the radius of described axle journal root arc surface is 1.7～2.0mm.

The utility model by to the right shell body axle journal, axle journal root and the step end face that are damaged easily through mid frequency induction hardening heat treatment, and the transition arc radius of increase differential right casing axon neck root, concentrate with the stress that reduces differential right casing axon neck root, the mechanical property and the mechanical strength at the axle journal root transition arc position between right shell body axle journal and the step end face have been improved, thereby improved the transmitting torque and the working life of differential mechanism, solved the defective that differential mechanism about one of about percentage can not satisfy the heavy-duty car usage requirement.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is user mode figure of the present utility model.

Embodiment

Further the utility model is illustrated below in conjunction with embodiment.

As shown in Figure 1, 2,2 butt joints are connected through bolt the left shell 1 of differential mechanism with right shell body, the central authorities of this right shell body 2 are provided with the through hole 5 that differential gear is installed, the hole wall of this through hole 5 axially stretches out and forms right shell body axle journal 4, the outer surface 4a of this right shell body axle journal 4 becomes 90 ° of angles with the step end face 2a of right shell body 2, and the axle journal root 3 that both intersect is arc surfaces, and the radius of this arc surface is 1.7～2.0mm, can be 1.7,1.8 or 2.0mm.Right shell body axle journal 4, axle journal root 3 and step end face 2a are carried out mid frequency induction hardening heat treatment, improve its surface hardness.Depth of hardening zone after the mid frequency induction hardening heat treatment is 2.0～6.0mm, can be 2.0,3.0,4.0,5.0 or 6.0mm, and hardness is 45～52HRC.

Claims

1. differential right casing body, central authorities at this right shell body (2) are provided with the through hole (5) that differential gear is installed, the hole wall of this through hole (5) axially stretches out and forms right shell body axle journal (4), the outer surface (4a) of this right shell body axle journal (4) becomes 90 ° of angles with the step end face (2a) of right shell body (2), and the axle journal root (3) that both intersect is an arc surface, it is characterized in that: described right shell body axle journal (4), axle journal root (3) and step end face (2a) are through mid frequency induction hardening heat treatment, depth of hardening zone is 2.0～6.0mm, and hardness is 45～52HRC.

2. differential right casing body according to claim 1 is characterized in that: the radius of described axle journal root (3) arc surface is 1.7～2.0mm.