WO2012013145A1

WO2012013145A1 - High slip planetary gear-type differential for automobile

Info

Publication number: WO2012013145A1
Application number: PCT/CN2011/077662
Authority: WO
Inventors: 高兴龙; 陈东时; 葛均师
Original assignee: 高屹
Priority date: 2010-07-27
Filing date: 2011-07-27
Publication date: 2012-02-02
Also published as: CN102338201A

Abstract

Disclosed is a high slip planetary gear-type differential for automobile. A passage for lubricating oil is arranged between a half axle gear shaft (4a) and a differential housing (1); the half axle gear shaft and a planetary gear axle (7) are processed with tungsten carbide or covered with a wear-resistant cladding layer; highly wear-resistant thrust washers (3, and 8) are arranged between the half axle gear shaft and the differential housing, and between a planetary gear (5) and the differential housing. The planetary gear-type differential solves problems of an automobile freewheeling device arranged at one end of the differential and at the head of a drive axle, whereby, when in freewheel conditions, the slip between the planetary gear and the planetary gear shaft, and the slip between the half axle gear shaft and the differential housing respectively increase by orders of magnitude, causing an increased amount of wear, loud noise, and a need for the planetary gear-type differential to be replaced after every 30 thousand to 50 thousand kilometers of driving, thus incurring increased costs of automobile use, reduced automobile reliability, and inhibiting placement of the automobile freewheeling apparatus on the drive axle which provides the optimal freewheeling effect. The present invention allows for optimization of automobile inertial effects, and is applicable to all power-driven automobiles fitted with a freewheeling device.

Description

Automotive high slip planetary gear differential

Technical field

The invention belongs to the technical field of automobile drive axle differential, and improves the service life and performance of the planetary gear differential under high slip condition by adopting lubricating oil passage, wear-resistant plating layer and high wear-resistant material, and provides The vehicle inertia gliding device is placed on the premise of one end of the differential to the drive wheel shaft head, and the inertia utilization effect is optimized.

Background technique

The existing automobile planetary gear differential has a small difference in running speed, and the wear is not serious, and the problem is not prominent. Generally, a window for lubricating oil to enter and exit is opened on the casing, and a journal between the half shaft gear and the differential housing A thrust washer is added, a spherical washer is added between the planetary gear and the differential housing, a plane is milled on the planetary gear shaft to ensure lubrication between the journals, or an oil hole is drilled between the half shaft gear and the planetary gear teeth. . In some technical solutions, the bushing is added between the half shaft gear and the differential case, or the planetary gear shaft is simply heat treated, although the improvement is made, but the car inertial sliding device is not disposed at one end of the differential to The problem of high slip wear caused by the drive axle head has been aggravated, and no high-slip planetary gear differential has been found yet. When the coasting device is arranged on one end of the differential to the drive axle head, the speed difference between the planetary gear and the planetary gear shaft, the half shaft gear shaft and the differential housing is increased by several times under the coasting condition. The wear and tear is intensified. The planetary gear differential has to be replaced after driving for 30,000 to 50,000 kilometers, resulting in an increase in the cost of using the vehicle and a decrease in the reliability of the vehicle. Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a planetary gear differential that is fully adaptable to high differential operating conditions by adopting a comprehensive high wear resistant technical solution. It is suitable for vehicles with various powers equipped with inertial gliding devices to optimize the inertia utilization effect of the vehicle. The car in this case refers to all motor vehicles, including electric vehicles, new energy vehicles, and vehicles without differentials.

The technical solution of the present invention is:

Lubricating oil passages are respectively arranged on the shaft shafts of the half shaft gear shaft and the planetary gear shaft to improve the lubrication condition at the two journals; between the half shaft gear and the differential housing and between the planetary gear and the differential housing High wear-resistant thrust washer, high wear-resistant thrust washer material can be stainless steel surfacing hard alloy or tungsten-cobalt hard alloy or steel-bonded hard alloy or Teflon or silicon nitride or tin phosphor bronze or yellow Copper or copper. The lubricating oil passage may also be provided on the differential case and the planetary gear that cooperate with the shaft shaft of the side gear and the journal of the planetary gear shaft.

Semi-axle gears and planetary gears are made of high-alloy tool steel or high-speed steel or imported wear-resistant steel or low-carbon alloy carburized steel or carbonitrided steel or high wear-resistant cold work tool gear steel or special automobile gear alloy steel, which can be 20CrNi3 or 18Cr2Ni4WA or 30CrMnTi or 38CrMoAlA or 22CrMoH or 35CrMo or 42CrMoA or 30CrMoSiA or 17CrNiMo6, 20CrNi2Mo or 25CrMoS4H or 34CrMoS4H or DC11 or SCM822H and high carbon high vanadium high speed steel.

The heat treatment used for the half shaft gear shaft and the planetary gear shaft may be high energy ion tungsten carbide treatment or composite silicon carbide coating treatment or TD treatment or boronizing.

Or a two-axis surface with a coating, which may be titanium carbide or titanium nitride.

A wear-resistant bushing or oil-impregnated bearing of the lubricating oil passage may be added to the journal between the half-shaft gear shaft and the differential case, and a wear fit is adopted between the wear-resistant bushing or the oil-impregnated bearing and the differential housing. This static fit can be a transition fit.

It is also possible to add a wear sleeve or an oil-impregnated bearing between the planetary gear and the planet pin journal.

Lubrication can also be added to the back of the side gear or planetary gear.

The back and flank surfaces of the semi-axle or planetary gears can also be improved by carbonitriding or manganese phosphating or shot peening, and the wear resistance can be improved by applying a coating on the back and flank.

When the differential housing is required to be arranged with a reinforcing rib, a containment counterbore extending to the other side housing may be provided on one side of the housing to cover the other side housing and cooperate with the outer casing. The body is positioned by the contact surface, and the center is fixed by the containment hole. Ribs are arranged outside the two sides of the housing to improve the overall strength of the differential housing.

The method for improving the wear resistance of the differential in the solution of the present invention is also applicable to a conventional differential for a general vehicle.

The detailed description of the present invention and the embodiments of the present invention are described in detail below with reference to the accompanying drawings. Various modifications and/or recombinations of the components in the present invention are included in the present invention without departing from the spirit and scope of the invention. The same reference numerals in the drawings denote the same or similar parts.

DRAWINGS

Figure 1 is a longitudinal sectional view of a high slip differential in an embodiment of the present invention;

2 is a longitudinal cross-sectional view showing a high slip differential of a planetary gear shaft journal with a wear sleeve disposed in an embodiment of the present invention; Figure 3 is a longitudinal sectional view of the high slip differential after the reinforcing ribs are arranged in the embodiment of the present invention; Figure 4 is a side view of the high slip differential after the reinforcing ribs are arranged in the embodiment of the present invention.

detailed description

Spiral lubricating oil passages 12, 13 are respectively provided at the journal shaft 4b and the journal of the planetary gear shaft 7 to improve lubrication conditions at the two journals, between the half shaft gear 4a and the differential housing 1 and the planetary gears The high wear-resistant thrust washers 3 and 8 between the 5 and the differential case 1 are made of tin phosphor bronze.

The spiral lubricating oil passages 12, 13 may be provided on the differential case 1 and the planetary gear 5 which are engaged with the side shaft shaft 4b and the shaft of the planetary gear shaft 7.

The gaskets 3 and 8 may also be stainless steel hardfacing or tungsten-tungsten carbide or steel-bonded carbide or Teflon or silicon nitride or brass or copper.

The semi-axle gear 4 or the planetary gear 5 is made of a high wear-resistant cold work tool gear steel DC11.

The semi-axle gear 4 or the planetary gear 5 can also be made of high alloy tool steel, high speed steel, imported wear resistant steel, low carbon alloy carburized steel or carbonitrided steel or special automobile gear alloy steel, which can be 20CrNi3 or 18Cr2Ni4WA or 30CrMnTi. Or 38CrMoAlA or 22CrMoH or 35CrMo or 42CrMoA or 30CrMoSiA or 17CrNiMo6, 20CrNi2Mo or 25CrMoS4H or 34 CrMoS4H or SCM822H and high carbon high vanadium high speed steel.

The outer surface of the half shaft gear shaft 4b and the surface of the planetary gear 5 shaft hole are treated with high-energy ion-tungsten carbide to improve the surface wear resistance, and can also be treated with a composite silicon carbide coating.

A wear-resistant bushing 2 is added to the journal between the half-shaft gear shaft 4b and the differential case 1 thereof, and the wear-resistant bushing 2 is statically fitted with the differential case 1, and the static fit can be a transition fit.

A wear sleeve 6 can also be added between the planet gear 5 and the journal of the planetary gear shaft 7.

The rear side of the side gear 4a or the planetary gear 5 may also be provided with a lubricating oil passage, and the oil passage may be a spiral lubricating oil passage or a radial oil passage.

The back side and the tooth surface of the side gear 4a or the planetary gear 5 can also be improved in wear resistance by carbonitriding or manganese phosphating or shot peening, and can also be improved by adding a silicon carbide coating on the back and tooth faces. Grinding.

When the differential housing 1 needs to be arranged with a reinforcing rib, a containment counterbore 9 extending to the other side housing may be provided on the one side housing 1a, covering the other side housing lb and engaging with the interference fit The housing la and the housing lb are positioned by the contact surface, and are centered by the containment counterbore 9. The housing la and the outer casing lb are provided with reinforcing ribs 10 and 11, respectively, to increase the overall strength of the differential housing 1. The method for improving the wear resistance of the differential in the solution of the present invention is also applicable to a differential for a general vehicle.

Claims

Rights request

1. A high-slip planetary planetary differential of a vehicle, in order to improve the wear resistance of the planetary gear differential, characterized in that the journal of the half shaft shaft (4b) and the planetary gear shaft (7) All have lubricating oil passages (12), (13), high wear resistance between the half shaft gear (4a) and the differential housing (1) and between the planetary gear (5) and the differential housing (1) Thrust washers.

2 . The high-slip planetary gear differential of the automobile according to claim 1 , wherein the lubricating oil passages ( 12 ) and ( 13 ) are also disposed on the axle shaft ( 4b ) and the planet. The journal shaft (7) of the gear shaft (7) is fitted with a differential housing (1) and a planetary gear (5).

3 . The high-slip planetary gear differential of the automobile according to claim 1 , wherein the high wear-resistant thrust washer material is stainless steel surfacing hard alloy or tungsten cobalt hard alloy or steel. 3 . Cemented carbide or Teflon or silicon nitride or tin phosphor bronze or brass or copper.

4. The automotive high slip planetary gear differential of claim 1 wherein the journal between the side gear shaft (4b) and the differential housing (1) is addable Wear-resistant bushings with oil lube or oil-impregnated bearings (2), static fit between wear-resistant bushings or oil-impregnated bearings (2) and differential housing (1).

The automobile high-slip planetary gear type differential according to claim 1, characterized in that the rear side of the side gear (4a) and the planetary gear (5) can also be filled with a lubricating oil passage.

The automobile high-slip planetary planetary differential according to claim 1, characterized in that the back side and the tooth surface of the side gear (4a), the planetary gear (5) can also pass carbonitriding Or manganese phosphating or shot peening to improve its wear resistance, and it can also be improved by adding a coating on the back and tooth surface.

The automobile high-slip planetary gear type differential according to claim 1, characterized in that, when the differential housing (1) needs to be arranged with a reinforcing rib, the one side housing (la) can be A containment counterbore sleeve (9) extending toward the other side casing is disposed to cover and cooperate with the other side casing (lb), and the casing (la) and the casing (lb) are positioned by the contact surface The core (9) is centered by the containment hole sleeve, and the reinforcing ribs (10) and (11) are separately arranged outside the casing (la) and the casing (lb) to improve the overall strength of the differential casing (1).

8. The automotive high-slip planetary planetary differential according to claim 4, characterized in that the static fit between the wear-resistant bushing or the oil-impregnated bearing (2) and the differential housing (1) For the transition.

9. A high-slip planetary gear differential of a vehicle according to any one of claims 1-8, The utility model is characterized in that the semi-axle gear and the planetary gear are made of high-alloy tool steel or high-speed steel or imported wear-resistant steel or low-carbon alloy carburized steel or carbonitrided steel or high wear-resistant cold work tool gear steel or special automobile gear alloy. steel.