WO2012016376A1

WO2012016376A1 - Differential, transmission device and vehicle using the same

Info

Publication number: WO2012016376A1
Application number: PCT/CN2010/075680
Authority: WO
Inventors: 魏家斌
Original assignee: Wei Jiabin
Priority date: 2010-08-03
Filing date: 2010-08-03
Publication date: 2012-02-09

Abstract

A differential includes a differential housing (1) driven by a power shaft. Left and right axle shafts (8) are rotatably mounted in the differential housing (1). One worm wheel (2) is mounted in the differential housing, and N worms (3) are meshed with the worm wheel (2), wherein N is an integer greater than or equal to 2. The left and right axle shafts are linked with at least one worm (3) via transmission components (6,7), respectively, and worms linked with the same axle shaft drives the worm wheel to rotate in a same direction, worms linked with different axle shaft drives the worm wheel to rotate in opposite directions. The differential provides a purely mechanical differential device which is not only differential but also nonskid, and solves the understeer problem of a front drive vehicle when cornering at high speed.

Description

Differential and transmission and car using the same

Technical field

The invention belongs to a mechanical transmission differential mechanism, and particularly relates to a differential device which realizes self-locking by using a mechanical one-way transmission.

Background technique

The differential is mainly used in the transmission system of the automobile. When there is a difference in rotational speed between the left and right driving wheels, the torque allocated by the differential to the slow driving wheel is greater than the torque of the fast driving wheel. The usual differential is divided into a gear differential and a limited slip differential (LSD). When a car is driving on a bad road, it seriously affects the passing ability. For example, when one driving wheel of a car is stuck in a muddy road, although the other driving wheel is on a good road surface, the gear differential is evenly distributed due to the characteristics of the gear differential. A driving wheel can only be divided into the same amount of torque as the sliding driving wheel, so that the driving force is insufficient to overcome the running resistance, and the car cannot advance.

In order to solve the above problems, some off-road vehicles and limousines are equipped with anti-skid differentials. The anti-slip differential allows most or all of the torque to be transmitted to a good road surface when one side of the drive wheel slips on a bad road. The upper drive wheel is used to make full use of the adhesion of the drive wheel to generate sufficient driving force to make the car start or continue driving smoothly.

The structure of the existing anti-slip differential is as described in U.S. Patent No. 2,558,641. As shown in Fig. 1, the differential includes a casing that can be driven by source power, and a pair of power output gears are rotatably mounted to the casing. In the body, and arranged to transmit power to different points, a pair of transmission gears having a diameter smaller than or equal to the power output gear are installed in the casing, and are designed to interact with the power output gear, the balance gear meshes with each transmission gear and the mutual diameter, and the power The output tooth is a worm, and the power transmitting tooth is a worm wheel. In this differential The gears produce slight positional changes during manufacture and assembly, which in turn causes a slight misalignment of the gear combination during engagement. This slight misalignment can jeopardize the optimum balance of the load side gear and may result in insufficient load imbalance. Wear and / or noise problems. An improved differential of the above-described technique is described in US Pat. No. 5,112,284, a differential assembly including a differential gearbox, and a differential gearbox having a device for mounting a pair of axles, each A side gear is respectively mounted on the half shaft and rotates coaxially therewith. The gear box also has a device for supporting at least one pair of gear sets, so that a gear set is separately engaged to a corresponding side gear, and the pair of gears The sets of intermeshing for coupling the side gears to their respective half shafts form an interaction relationship, characterized in that said support means for supporting one gear combination on each side of said gear set further comprises a cylinder A mounting device that allows the gear set to be positionally adjusted about the mounting device with respect to the side gears that mesh with it in an axial direction parallel to the side gear shaft. The worm of the above differential is directly connected to the half shaft, and a plurality of worm wheels are arranged around the worm, which causes the manufacturing process of the worm wheel and the worm to be very high and difficult to assemble; and because the lead angle of the worm is large, in the single When the side tires slip, the effect of locking the two half shafts by 100% cannot be achieved. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a differential having a low manufacturing cost and an excellent interlocking effect in view of the deficiencies in the prior art.

The technical solution of the present invention is as follows:

A differential includes a differential case driven by a power shaft, the left and right half shafts being rotatably mounted in the differential case, wherein: a worm gear is also mounted in the differential case. There are N worms meshing with the worm wheel, wherein N is an integer greater than or equal to 2, the left and right half shafts are respectively linked with at least one worm through the transmission component, and the transmission of the worm wheel, the worm and the transmission component is as follows: When the worm gear is oriented in a certain direction When rotating, the left and right half shafts are driven to rotate in opposite directions by the worm and the transmission member engaged therewith. An additional technical solution of the present invention is as follows:

Preferably, a semi-axle gear is fixed to the left and right axles, and the axle gear drives the worm shaft of the worm by meshing with the transmission gear.

Preferably, all of the worms have the same modulus.

Preferably, the worm gear shaft is perpendicular to the worm shaft.

Preferably, the worm and the transmission member are symmetrically arranged about the center of the worm wheel shaft.

Preferably, N is an even number.

Preferably, N=2, both ends of the worm shaft are mounted on the differential case.

Preferably, N=4, the left and right half shafts are respectively linked with the two worms through the transmission member, and each of the half shafts is fixed and the transmission ratio between each of the half shafts and the two worms associated therewith is the same.

A transmission using the above differential includes a frame, a power input shaft and a differential, a bevel gear is fixed on the power input shaft, and the bevel gear meshes with a fixed bevel gear on the differential case, the differential The two half shafts are rotatably mounted to the frame by bearings.

A car using the above transmission.

The beneficial effects of the present invention are as follows: The double worm gear is unlocked by utilizing the interlocking characteristics of the double worm worm wheel and the overrun characteristic of the outer wheel speed when the vehicle turns when the vehicle is turning more than the inner wheel speed. Since the half shaft is linked with the worm through the transmission part, the worm wheel and the worm can use the common worm gear, the worm gear is less difficult to manufacture, the assembly is easy, and the manufacturing cost is reduced; and the worm wheel and the worm are not directly mounted on the half shaft, The positional relationship does not depend on the position of the half shaft. The worm gear and the worm are easy to disassemble for easy maintenance. DRAWINGS

The invention will be illustrated by way of example and with reference to the accompanying drawings in which:

1 is a schematic view of a prior art limited slip differential.

Fig. 2 is a cross-sectional view showing the first embodiment of the differential of the present invention.

Figure 3 is a schematic illustration of a transmission incorporating the differential of Figure 2. Figure 4 is a cross-sectional view of the transmission of Figure 3.

Figure 5 is a schematic illustration of another embodiment of a differential of the present invention.

Figures 6 and 7 are schematic views of a transmission incorporating the differential shown in Figure 5.

Figure 8 is a cross-sectional view of the transmission of Figure 7. detailed description

A specific embodiment of the present invention, as shown in FIG. 2, a differential having a differential case 1 on which a worm gear 2 is mounted on the differential case 1 and a worm gear 1 is engaged on the worm wheel 1 The two ends of the worm 3 are rotatably mounted on the differential case 1. The output gear 6 is fixed on the shaft of the worm 3, and meshes with the side gear 7 to form a pair of gear pairs. The half shaft 8 is rotatably mounted on the differential speed. In the case 1. The movement of the worm 3 and the worm wheel 2 is as follows: The worm driving the worm gear in the same direction as the same half shaft rotates in the same direction. When the worm wheel rotates in a certain direction, the worm and the transmission member are driven to drive the left and right half shafts toward Turn in the opposite direction. Specifically, in this example, when the left and right half shafts 8 have a tendency to rotate in the same direction, they have a tendency to push the two worms 3 to rotate in opposite directions, and the worms 3 on both sides push the worm wheel 2 to rotate in the opposite direction, thus reaching each other. The effect of the lock causes the left and right axles 8 to be unable to rotate relative to the differential case 1. And in order to optimize transmission efficiency, all of the worms 2 have the same modulus.

In the above embodiment, the recommended number of worm heads is 1, 2, 4, and 6. When the number of worm heads is 1, the gear ratio is large, and the self-locking effect of 100% can be achieved.

3 and 4, a transmission using the above differential includes a case 4, i.e., a frame, the differential case 1 is located in the case 4, and the half shaft 8 is mounted in the case through the bearing 9. 4, the differential case 1 is rotatable about the half shaft 8, the reduction case 10 is fixed on the differential case 1, and meshes with the input gear 11 on the drive shaft 12, and the drive shaft 12 is mounted in the bearing on the case 4 .

The working principle of the above transmission device is as follows: When the vehicle advances, the power is input from the drive shaft 12 to the gear 11 to reduce the gear 10 to the differential case 1 so that the worm gear 3 and the reduction gear 10 in the differential case 1 are deteriorated. The speed shell 1 rotates, the worm wheel 2 and the worm 3 interlock, and the side gear 7 and the half shaft 8 are pushed to rotate with the differential case 1 to drive the vehicle forward.

When the vehicle turns: Since the outer wheel rotates more than the inner wheel, the worm 3 and the output gear 6 and the differential case 1 in the differential case 1 rotate around the side gear 7, and at the same time, the worm 3 is rotated, so that the worm 3 is rotated. The left and right axles can be rotated at different speeds, so that the differential unlocks the vehicle and the wheels on both sides have driving force.

When the friction between the wheel and the ground on the vehicle side is reduced or suspended: Since there is no overtaking characteristic when turning, the double worm and worm gear interlocking mechanism cannot be unlocked, and the power is transmitted to the other wheel, thereby propelling the vehicle forward.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 2, as shown in FIG. 2, a differential having a worm gear shaft 25 in a differential housing 21, a worm gear 22 mounted on a worm gear shaft 25, and four worm shafts 23 on a worm gear shaft 25 The center is symmetrically mounted in the differential case 21 and meshes with the worm wheel 22, and the four worms 23 are divided into two groups which are respectively coupled to the left and right half shafts 28 via transmission members, and two halves are fixed on each of the half shafts 28. The shaft gear, the gear 27 and the bevel gear 36, the gear 27 meshes with the gear 26, the gear 26 is fixed to the shaft of a worm 23, the bevel gear 36 meshes with the bevel gear 35, and the bevel gear 35 is fixed to the shaft of a worm 23, The formed four worms 23 are arranged in a square around the worm wheel 11, and the gear ratio between each of the half shafts 28 and the two worms 23 associated therewith is the same. The transmission interlocking relationship between the worm wheel 23 and the worm 22 is similar to that of the first embodiment.

A transmission using the above differential, as shown in Fig. 6, a reduction gear 30 is fixed to the differential case 21, and the reduction gear meshes with an input gear 31 on the drive shaft 32, and these devices are mounted in the case 24, as shown in Fig. 7, the half shaft 28 and the drive shaft 32 are all mounted on the casing through respective corresponding bearings 29.

Embodiment 3 of the present invention, a steam in which a differential and a transmission are installed in a transmission system The car, similar to the prior art, only needs to replace the differential in the car with the differential in the invention, and other supporting devices can be changed without modification. The power output value of the automobile engine is connected to the power input shaft of the transmission through a transmission mechanism, and the half shaft is connected to the axle of the automobile or the power input shaft of the differential on the front and rear axles of the automobile.

All of the features disclosed in this specification, or steps in all methods or processes disclosed, in addition to mutually exclusive features and/or steps, may be combined in any manner.

Any feature disclosed in this specification (including any additional claims, abstracts and drawings) may be replaced by other equivalents or alternative features, unless otherwise stated. That is, unless specifically stated, each feature is only one example of a series of equivalent or similar features.

The invention is not limited to the specific embodiments described above. The invention extends to any new feature or any new combination disclosed in this specification, as well as any novel method or process steps or any new combination disclosed.

Claims

WO 2012/016376 claims PCT/CN2010/075680, a differential comprising a differential case driven by a power shaft, the left and right half shafts being rotatably mounted in the differential case, characterized in that : A worm gear is also installed in the differential case, and N worms are meshed with the worm wheel, wherein N is an integer greater than or equal to 2, and the left and right half shafts are respectively linked with at least one worm through the transmission component, and the worm wheel, the worm and the transmission The transmission of the components is as follows: When the worm gear rotates in a certain direction, the worm and the transmission member that cooperate with it drive the left and right half shafts to rotate in opposite directions.

A differential according to claim 1, wherein: the semi-axle gear is fixed to the right and left half shafts, and the half shaft gear drives the worm shaft of the worm by meshing with the transmission gear.

The differential of claim 1 wherein: the worm gear shaft is perpendicular to the worm shaft. The differential according to claim 1, wherein: said worm and said transmission member are symmetrically arranged about a center of the worm wheel shaft.

The differential according to claim 1 or 4, wherein: N is an even number.

The differential according to claim 5, characterized in that preferably N = 2 and both ends of the worm shaft are mounted on the differential case.

The differential according to claim 5, wherein: N=4, the left and right half shafts are respectively coupled with the two worms through the transmission member, and each of the half shafts is fixed with two half shaft gears, each of the half shafts The gears respectively drive the corresponding worms through different transmission gear sets, and the transmission ratio between each half shaft and the two worms associated therewith is the same.

A differential according to claim 1 or 4, wherein: said worms have the same modulus.

A transmission using the differential according to claim 1, wherein: the device comprises a frame, a power input shaft and a differential, the bevel gear is fixed on the power input shaft, the bevel gear and the differential case The upper fixed bevel gear meshes, and the two half shafts of the differential are rotatably mounted on the frame by bearings.

A vehicle using the transmission of claim 9, wherein: the power input shaft of the transmission is connected to the power output shaft of the engine through a transmission member, and the axle is connected to the axle of the automobile or the front of the vehicle. The power input shaft of the differential on the rear axle.