JPH01307546A - Bevel-gear differential gear particularly for automobile - Google Patents

Abstract

PURPOSE: To provide uniform load distribution to all bevel gears by storing three differential bevel gears disposed at peripheral spaces on journals so that a center support can be oscillated from a position of cutting the shaft of a differential basket at a right angle within the limit of an intersection or its vicinity. CONSTITUTION: Journals 15 supported by differential bevel gears 14 at peripheral spaces in a rotatable manner are disposed in one plane of a center support 16. The support 16 is stored on the journal 15 in a differential basket 11 so as to be oscillated from a position of cutting the shaft 17 of the differential basket at a right angle within the limit of an intersection or its vicinity. As a result, a circle running error in the differential bevel gear 14 can be adjusted, by the support 16 itself, in association with the differential bevel gear 14 so as to be offset similarly to nonuniform load distribution generated therefrom. Slight wear is thus developed at the side of teeth and load distribution is improved through three existing journals 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention includes a differential basket driven and rotatably supported within a housing, in which a differential basket is driven and rotatably supported within a housing. two driven bevel gears are supported on the shaft, the driven bevel gears are mated with a differential bevel gear, and the differential bevel gears are mounted on a journal disposed perpendicular to the axis of rotation. The present invention relates in particular to a bevel gear differential gear for motor vehicles, in which the journal is rotatably housed and the journal is supported without idling in the differential basket.

[Prior art]

In this type of bevel gear operating gear, the differential gear support has one or two shafts, but these two shafts are usually mounted in fixed positions; Two or four differential bevel gears are rotatably arranged on the top.

Transmission of rotational torque via two bevel gear differentials is often not possible due to the high rotational torques or results in severe wear on the sides of the teeth. When four differential bevel gears are used, the loads applied to the sides of the teeth are unbalanced. Differential bevel gears are subject to uneven loads.

This especially occurs when circular running errors of the differential bevel gear cannot be avoided. Even when the three differential bevel gears are clamped to the differential basket or fixed to a slidable support, the aforementioned problems may still remain unresolved. .

A differential star box with six journals is already known;
It consists of an arm-type differential star box. Both differential star boxes, each containing three journals, however, are integrally connected to each other, and in addition two differential bevel gears are rotatably supported on each journal. Because of this configuration, a three-arm differential starbox mounted on a differential bevel gear support with six journals behaves like a single differential bevel gear support.

Such three-arm differential starboxes, such as those provided in differential bevel gear supports with four journals, have drawbacks. Others, DE-OS 30
In differential gears such as those known from 00128 and considered for use in lorries, the task of enabling a dual support function is fundamental.

[Purpose of the invention]

Starting from this point, the basic object of the invention is to provide a bevel gear differential drive in which an automatically applied and uniform load distribution is obtained for all bevel gears involved in the rotational moment transmission. It is in.

[Structure of the invention]

The object is that, according to the invention, three differential bevel gears are provided which are arranged at a circumferential distance from each other; a journal in which the differential bevel gears are rotatably supported on the journal; are arranged in one plane in the central support, and the support is configured to swing the differential basket only around the point of intersection, starting from a position perpendicular to the axis of rotation of the differential basket. This problem is solved by being stored on a journal within the system.

According to such an embodiment, the support itself, the differential bevel gear, This means that they can be adjusted in conjunction with each other. The advantage here is that only little wear occurs on the sides of the teeth.

Furthermore, an improved load distribution could in principle be achieved through the three journals present. In other words, a statically constant system is created. As a particular preference, the journal has a constant circumferential spacing or gauge of 120° on the support. However, it is also possible to keep the gauge constant.

In a further embodiment of the invention, the end of the support journal is housed in a differential basket groove extending parallel to the axis of rotation to prevent it from idling.

In order to reduce the plane pressure, the journal has at its radially outer end a flat section running parallel to the plane containing the axis of the journal and the axis of rotation, respectively;
The journal is supported against the sides of the groove.

In order to facilitate the adjustment of the support by the journal, it is proposed that the end face of the journal has a margin with respect to the basic face of the groove. The center point can be the intersection of the axis of rotation of the differential basket and the plane containing the axes of all the journals.

Further, the support part has a central hole, and the driven shaft that passes through this hole and is connected to the driven bevel gear so as not to idle is guided with a margin, and this driven shaft is further guided to pass through the support part. The end of the bevel gear is connected to the corresponding boss of the braking moment generating coupling; and the equipment with which the other driven bevel gear is connected to the housing of the coupling is the main part that forms the bevel gear differential gear. In an embodiment of the invention, a drive is proposed which is configured to limit and lock automatically.

Preference is then given to configuring the coupling as a viscosity-imparting coupling.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, which illustrate one embodiment of the invention.

FIG. 1 shows a drive diagram for a motor vehicle in which both front wheels l and 2 are driven, the two rear wheels 3 and 4 being driven.

The vehicle is driven by an engine 5, a switching drive unit 6,
The front wheels 2.1 are connected to the front wheels 2.1 via a bevel gear differential 7 and drive shafts 8 and 9. The bevel gear differential gear 7 can be configured as a bevel gear drive in an open state and automatically limiting and locking. In the case of a configuration in which the locking operation is automatically limited, a coupling that generates a braking moment corresponds to the bevel gear differential gear.

Next, the structure of the open bevel gear differential gear will be explained based on FIGS. 2 and 3. The bevel gear differential gear 7 has a housing 10 in which a differential basket 11 is supported so as to be rotatable around a rotation axis 17. The differential drive mechanism 11 is driven by a switching drive mechanism via gears (not shown). In the differential plunket 11, two driven bevel gears 12, 13 are arranged axially equally with respect to the rotating shaft 17 of the differential blanket 11.
It is arranged so that it can rotate. Both driven bevel gears 12, 13 are connected to each of the front wheels 1.2 in terms of rotational moment via a drive shaft 8.9.
A differential bevel gear support portion 16 is disposed between 2° and 13. This differential bevel gear support section has journals 15 distributed around the periphery, and this journal shaft 19 is arranged within one plane. A differential bevel gear 14 is rotatably supported on the journal 15 and is fitted with two driven bevel gears 12 and 13, respectively. The journal 15 of the support part 16 is housed within the inner surface 34 of the differential basket 11 in a groove 18 with its journal ends hanging. The groove 19 extends parallel to the axis of rotation 17 of the differential basket 11 . In both directions of rotation, the end of the journal 15 is provided with a flat surface 20, which lies flat on the side 21 of Va18. The distal surface 22 of the journal 15 has a margin relative to the basic surface 23 of the groove 18 . Furthermore, the axial extension of the groove 18 is dimensioned so that the support 16 can be axially positioned at least within limits with respect to the differential basket 11.

The support portion 16 is housed so as to be able to swing within a limited range around the intersection S by the rotation shaft 17 of the differential basket 11 between surfaces including the journal shaft 19 . Due to such limited swingability, on the one hand, the support part 16
The possibility is obtained that, on the one hand, and on the other hand, the differential bevel gear 14 can be adjusted and adjusted in such a way that a uniform load distribution is provided. A bearing plate 35 is disposed between the outer surface of the differential bevel gear 14 and the inner surface 34 of the differential basket 11. Differential bevel gear 1 relative to differential basket 11
A flat contact and support of 4 is thereby achieved.

In FIG. 4, a self-limiting and locking bevel gear drive 7 is shown. In principle, differential bevel gear 1
4. The configuration and layout of the driven bevel gear 12, 13 and the support 16 with journal 15 correspond to the embodiment according to FIGS. 2 and 3. However, a coupling for generating a braking moment is additionally arranged in the differential basket 11 of the bevel gear differential gear 7. Couplings are labeled with 25. This coupling is configured as a viscosity-retaining coupling. The driven bevel gear 12 is a component of the flange 28, which is a part of the housing 27 of the coupling 25. The coupling housing 27 further includes a covering portion 30 and a flange 29 attached to the other end. Furthermore, the coupling 25 has a force-pull boss 26 . A disk is arranged in the ring-shaped gap between the coupling boss 26 and the covering part 30. Two attachment points are provided for the coupling discs 31, 32, the outer one of these discs 32 is fitted with a spacer ring 3 to prevent it from slipping.
3 and are secured between the teeth of the covering portion 30 at a distance from each other. The force and pull boss 26 are provided through teeth to prevent the inner disk 31 from idling. The outer disks 32 and inner disks 31 are arranged alternately. A drive shaft 8 that serves to drive the front wheels 2 is connected to a driven bevel gear 13 via a journal to prevent it from idling. Furthermore, the drive shaft 8 is guided through the bore 24 in the support 16 and is likewise connected to the coupling boss 26 in a non-slip manner by means of tooth engagement in the bore of the coupling boss 26. The driven bevel gear 12 is connected to the drive shaft 9 via the flange 18, the covering portion 30, and the flange 29 so as not to idle. In addition, the drive shaft 9 is housed within the cylindrical protuberance of the flange 29 to prevent it from idling. The inner space of the coupling 25 which is not occupied by the disks 31, 32 is at least partially filled with a viscous liquid, for example silicone oil. The radial space between the outer surface of the drive shaft 8 and the wall of the hole 24 in the support 16 is defined by the support 15 with the journal 15.
is dimensioned such that limited rocking motion relative to the differential basket 11 is not obstructed.

When different viscosity coefficients occur on both front shafts 1 and 2,
A viscous coupling function is already known, which generates a braking moment until a balancing adjustment takes place in both driven bevel gears 17,13.

For simplicity, the housing in which the differential basket 11 is supported is not shown in FIG.

・[Effect of the invention] In the differential basket, three differential bevel gears are prepared in addition to both driven bevel gears 12 and 13, and these differential bevel gears are rotatably mounted on the journal of the support part. It is deployed. The support part itself is arranged inside the groove of the differential basket so that the support part can swing in a limited manner around the intersection S between the plane containing the axis of the journal and the axis of rotation of the differential basket. Storage is secured by a journal.

This provides a constant load distribution, especially when the differential bevel gear exhibits circular running errors, and the provision of three journal shafts ensures a statically constant system.

4. Brief description of the drawings Figure 1 is a drive diagram for a front-wheel drive vehicle, Figure 2 is a longitudinal section of an open bevel gear differential gear, and Figure 3 is a bevel gear support section. FIG. 4 is a cross-section of a differential basket having a differential bevel gear and a differential bevel gear; FIG. It is a moving gear.

Each reference number indicates each part of the device.

1.2...Front wheel 3.4...Rear wheel 5...Engine 6...Switching drive section 7...Bevel gear differential gear 8.9...Drive shaft lO...Housing
11... Differential basket 12, 13... Driven bevel gear 14... Differential bevel gear 15... Journal
16...Support part 17...Rotary shaft 18...Groove of differential basket 19...Journal shaft 2
0... Flat part 21... Side part of the groove 22...
・Journal end surface 23...Basic surface of the groove 24...Support inner hole 2
5... Coupling 26... Coupling post 27... Coupling housing 28, 29... Flange 30... Covering portion 31.
...Inner disk 32...Outer disk 33...
・Spacer ring 34...Differential basket inner surface 35...Bearing plate Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] 1. A differential basket is driven and rotatably supported within a housing, and in this differential basket, two driven bevel gears are connected coaxially to the rotating shaft. are supported, these driven bevel gears are mated with differential bevel gears, and these differential bevel gears are housed so that they can rotate on journals disposed at right angles to the axis of rotation. In particular, in automotive bevel gear differential gears, in which these journals are supported without idling in a differential basket, three differential bevel gears (
14) is prepared; the journal (15) on which the differential bevel gear (14) is rotatably supported is arranged in one plane of the central support part (16); The differential basket (11) is configured so that the support part (16) can swing only around the intersection (S) starting from a position that cuts the rotation axis (17) of the differential basket (11) at right angles. 11) within the journal (1
7) A bevel gear differential gear characterized by being housed above. 2. A differential basket (11) in which the end of the journal (15) of the support part (16) extends parallel to the rotation axis (17).
2. The bevel gear differential gear according to claim 1, wherein the bevel gear differential gear is housed in the groove (18) of the groove (18) to prevent it from idling. 3. The journal (15) is provided at its radially outer end with a flat surface (20) running parallel to the plane with the axis (19) and the axis of rotation (17), with which the journal (15) ) is the flange (
21) The bevel gear differential gear according to claim 2, wherein the bevel gear differential gear is supported so as to be in contact with the bevel gear. 4. The bevel gear differential gear according to claim 2 or 3, characterized in that the end surface (22) of the journal has a margin with respect to the basic surface (23) of the groove (18). 5. The end surface (22) of the journal (15) is configured as a partial surface of a cylinder, the center point of which is located between the axis of rotation (17) of the differential basket (11) and all journals (15). 3. The bevel gear differential gear according to claim 2, wherein the bevel gear differential gear is an intersection point (S) with a plane including. 6. Bevel gear differential gear according to claim 1, characterized in that the journals (15) incorporate non-constant cage angles between themselves. 7. The support part (16) has a central hole (24), and the driven shaft (8), which passes through this hole and is connected to the driven bevel gear (13) so as not to idle, is guided to pass therethrough with a margin; This driven shaft is furthermore connected at its end guided through the support (16) with the corresponding boss (26) of the braking moment-generating coupling (25); and with the other driven bevel gear (12). ) is the housing (27) of the coupling (25).
), the bevel gear differential is configured to automatically limit and lock. 8. Bevel gear operating gear according to claim 7, characterized in that the coupling (25) is constructed as a viscous coupling.