CN103925351A

CN103925351A - Planet worm and gear limited slip differential

Info

Publication number: CN103925351A
Application number: CN201410129357.XA
Authority: CN
Inventors: 魏家斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-03-24
Filing date: 2014-03-24
Publication date: 2014-07-16

Abstract

A planet worm and gear limited slip differential is characterized in that at least two groups of planet worms and gears on a shell of a differential body, and one group comprises two worm gears engaged with one worm; the worm gears are rotationally mounted on the shell of the differential body, and the worms are rotationally mounted on planet worm gear shafts fixed on the shell of the differential body; left and right half-shaft worms are arranged in the shell of the differential body and are engaged with the worm gears in the groups of the planet worms and gears; the left and right half-shaft worms and the worms in the groups of the planet worms and gears are all multithread worms.

Description

A kind of planetary worm gear worm screw limited slip differential

Technical field

The invention belongs to a kind of mechanical transmission box of tricks, be specifically related to a kind of differential mechanism that utilizes mechanical single-direction transmission to realize self-locking.

Background technique

Differential mechanism is mainly used in the transmission system of automobile, and in the time that left and right sidesing driving wheel exists speed discrepancy, the torque that differential mechanism is distributed to slow-speed driving wheel is greater than the torque that turns soon driving wheel.Common differential mechanism is divided into compensating gear and limited-slip differential (Limi ted Slip Differential is called for short LSD).

Compensating gear can meet the torque distribution characteristic that automobile normally travels in good road surface.But in the time travelling on automobile Huai road, but have a strong impact on passing capacity, for example, in the time that a driving wheel of automobile is absorbed in muddy road surface, although another driving wheel is in good road surface, but because of the feature of compensating gear mean allocation torque, this driving wheel also can only be assigned to and the torque of the driving wheel equivalent of trackslipping, so that driving force is not enough to overcome running resistance, automobile can not advance.

In order to address the above problem, on some offroad vehicle and limousine, install limited slip differential, limited slip differential can make in the time trackslipping on a side drive wheel Huai road, can make the even whole torques of major part pass to the driving wheel in good road surface, produce enough driving forces to make full use of the adhesion of this driving wheel, make automobile start to walk smoothly or continue to travel.

The structure of existing anti-limited-slip differential is as described to some extent in US Patent No. 2859641, this differential mechanism comprises a casing that can be driven by driving source, a pair of power output gear is rotatable to be installed in housing, and arrange by transmission of power to different points, the transmission gear that a pair of diameter is less than or equal to power output gear is installed in housing, and design and power output gear effect, balance gear engages with each transmission gear and mutual diameter, power output gear is worm screw, and it is worm gear that power transmits tooth.This differential mechanism middle gear can produce slight shift in position in the time manufacturing and assemble, and this can cause the slightly misaligned of Gear combination in the time of engagement, this slightly misaligned may jeopardize this load side gear optimum balance, and may cause being enough to the bad wearing and tearing of load unbalanced generation and or noise problem.

Summary of the invention

The novel object of the present invention is for deficiency of the prior art, a kind of low cost of manufacture is provided, interlocks effective pure worm-and-wheel gear differential mechanism.

The novel technological scheme of the present invention is as follows:

A kind of planetary worm gear worm screw limited slip differential is characterized in that: on differential carrier, worm screw of two worm gears engagements of even setting at least two group is the planetary worm gear worm screw group of a group, worm gear is rotatable to be contained on differential carrier, planet worm screw is rotatable to be contained on planet worm shaft, planet worm shaft is fixed on differential carrier, left and right half worm screw is set in differential carrier again and engages with the worm gear in planetary worm gear worm screw group, the planet worm screw in left and right half worm screw and planetary worm gear worm screw group is all multi-start worm.

Brief description of the drawings:

The present invention will illustrate by example and with reference to accompanying drawing mode, wherein:

Fig. 1 is embodiments of the invention schematic diagram;

Fig. 2 is the cut-away view of Fig. 1;

In figure: 1, differential carrier 2, semiaxis worm screw 3, planet worm screw 4, planet snail worm shaft

Embodiment:

As shown in Figure 1, 2, it is the planetary worm gear worm screw group of a group that a kind of planetary worm gear worm screw limited slip differential evenly arranges worm screw of four groups of two worm gears engagement on differential carrier, 1. the rotatable differential carrier that is contained in of worm gear is gone up, 4. the planet worm screw 3. rotatable planet worm shaft that is contained in goes up, 4. planet worm shaft is fixed on differential carrier and 1. goes up, left and right half worm screw be set 2. and engage with the worm gear in planetary worm gear worm screw group in 1. at differential carrier again, left and right half worm screw 2. with planetary worm gear worm screw group in planet worm screw be all 3. multi-start worm.

In the time that vehicle is kept straight on, power by driving mechanism to differential carrier 1., then to planet worm shaft 4. and worm-wheel shaft, then by worm-gear tooth be delivered to semiaxis worm screw 2. tooth again to wheel.

In the time of Vehicular turn, because both sides wheel exists speed discrepancy, 2. planetary worm gear worm screw group can revolve round the sun around inner side semiaxis worm screw in rotation, and drives outside semiaxis worm screw 2. to rotate simultaneously and realize and turning to.

Though the present invention is locking completely, compared with prior art have its locking power of two, and output torque is larger.

Claims

1. a planetary worm gear worm screw limited slip differential is characterized in that: on differential carrier, worm screw of two worm gears engagements of even setting at least two group is the planetary worm gear worm screw group of a group, worm gear is rotatable to be contained on differential carrier, planet worm screw is rotatable to be contained on planet worm shaft, planet worm shaft is fixed on differential carrier, left and right half worm screw is set in differential carrier again and engages with the worm gear in planetary worm gear worm screw group, the planet worm screw in left and right half worm screw and planetary worm gear worm screw group is all multi-start worm.