JPH1082455A - Driving shiftable reduction gears for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide reduction gears with only minimum frictional loss, wear, noise and heating generated in an on-road running speed change stage. SOLUTION: Shiftable reduction gears consists of a case 1, an input shaft 4, an output member 6, planetary gears 7 and a shift sleeve 8 movable on the output member 6 and always connected to the output member 6. The planetary gears 7 consist of an internal tooth ring gear 10 fixedly connected to the case 1, a sun gear 11 on the input shaft 4, and an epicyclic carrier 13 with a first connecting tooth 17. In order to receive only minimum loss in a road traveling speed change stage, then sun gear 11 is rotatably supported on the input shaft 4 and has a third connecting tooth 19, and a shift boss 5 with a fourth connecting tooth 21 is connected out of relative rotation to the input shaft 4. In addition, a shift ring 22 has a fifth connecting tooth 23 and is rotatably guided in the shift sleeve 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a planetary gear system in which a reduction gear unit includes a case, an input shaft, an output member, a planetary gear unit, and a shift sleeve movable on the output member and always connected thereto. Comprises a ring gear internally fixedly connected to the case, a sun gear on the input shaft, and a planet carrier with first connecting teeth, the first connecting teeth on the shift sleeve. The present invention relates to a shiftable reduction gear device for driving an automobile, which is connectable to a second connection tooth.

[0002]

2. Description of the Related Art Such reduction gears are used in power transmission systems of all-wheel drive vehicles in various arrangements, i.e., vertically or horizontally, and in various arrangements of the elements of the power transmission system that follow. . At that time, the ring gear fixed to the case,
It contributes to small space requirements, low cost structure and simple assembly. Since the large and heavy ring gear does not rotate, the inertial mass rotating at high speed is also reduced.

A reduction gear train of the type mentioned at the beginning is known from EP-A-202 951. There, a sun gear is fixedly connected to the input shaft and is connected directly to the output member by means of a shift sleeve, whereby a high road speed is obtained. However, the planet gears then roll on the sun gear, causing the planet carrier to also rotate. This is undesirable. Because, at the gears that use the most time (and pure outdoor vehicles travel at the highest speeds in roadway gears at the highest speeds), large friction losses, wear, noise and heating are caused. Because it will happen. Another known reduction gearing of the type mentioned at the outset, type NVG of the New Venture Gears
At 249, the situation is the same.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve a reduction gearing of the type mentioned at the outset so that only minimal friction damage, wear, noise and heating occur at road speeds. It is to be.

[0005]

According to the present invention, there is provided: a) a sun gear is rotatably supported on an input shaft;
And b) the shift boss has fourth connection teeth and is coupled so as not to rotate relative to the incoming shaft; c) the shift ring has fifth connection teeth, and has a shift sleeve. It is rotatably guided inside.

[0006] Feature a) provides a prerequisite for stopping the planetary gear set at high gear and without torque, with all the advantages that result therefrom. The shift boss, which is always connected to the input shaft according to feature b), is directly connected to the output member by the shift ring according to feature c), which is only possible due to the free rotation of the shift ring. However, at the speed on road, the shift sleeve rotates at the same speed and therefore does not rotate relative to each other, so that no wear occurs. Even at the outdoor travel speed, the relative rotational speed is small according to the reduction ratio of the outdoor travel speed. The shift ring is guided in the shift sleeve, so only one
Makes time with one operating mechanism.

In a preferred embodiment, the movable shift sleeve and the output member are connected by a sixth connecting tooth and a seventh connecting tooth which is an external tooth, and the fourth connecting tooth is the same as the seventh connecting tooth. It has a cross section (claim 2). In this way, the connecting teeth have the same dimensions, which makes the manufacture significantly less expensive and the shift sleeve is guided on the one hand on the output member and on the other hand via the shift ring, so that the shift sleeve can be used without additional bearings. Guided correctly.

In addition, a suitable axial positioning of the connecting teeth ensures that all the connecting teeth do not engage at the same time during the shifting, so that the shifting process takes place comfortably in two phases of movement. This is also facilitated by the fact that the entire planetary gear set is still rotatable and torque-free at the road speed when switching from the road speed to the outdoor speed.

If the third connecting tooth is an external tooth on the collar of the sun gear and has the same cross section as the seventh connecting tooth (claim 3), the sun gear can be further simplified on the input shaft. And the guide length is increased.

The reduction gear can be used in a variety of configurations. Independently, a structural simplification results if the output member is drive-coupled to the drive member of the differential gearing (claim 4). This simplification is particularly significant when using a bevel gear differential gearing, provided that the output member is part of a differential gear case (claim 5).

In the vertical arrangement of the power transmission system, the input shaft and the output member are hollow shafts, and the shaft driven by the differential gear device is housed in the internal space of these hollow shafts. (Claim 6) provides a particularly advantageous arrangement.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS The invention is described below with reference to an embodiment shown in only one figure.

The case 1 of the shiftable reduction gear device comprises:
It may be a unique case or part of a larger case. The case lid 2, which closes the case 1 on the left side of the figure, houses the bearing 3 of the input shaft 4, which is a special case hollow shaft. Since the case 1 is cut off on the right side of the figure, the other bearing is not visible. A shift boss 5 is keyed on the input shaft 4. The output member 6 is provided concentrically with respect to the input shaft 4. The input shaft 4 is surrounded by a planetary gear set 7. This planetary gear set 7 has a shift fork 9
(Dashed line) and the shift sleeve 8, the low speed (outdoor running speed) and the high speed (road running speed).
Can be shifted back and forth.

The planetary gear device 7 includes an annular gear 10 fixedly provided in the case 1, a sun gear 11 supported on the input shaft 4 by a needle bearing 12, and a planet carrier 13.
And consists of The planet carrier 13 includes a planetary gear 15.
Has a number of planetary shafts 14 rotatably supporting and terminates in a collar plate 16 having first connecting teeth 17 configured as internal teeth.

The first connecting teeth 17 cooperate with second connecting teeth 18 which are configured as external teeth of the shift sleeve 8. The sun gear 11 is a collar 2 having third connecting teeth 19
0, and the shift boss 5 following the third connecting tooth 1
It has fourth connecting teeth 21 configured as external teeth having the same cross section as 9.

A shift ring 22 is provided in the shift sleeve 8.
Are guided so as to be freely rotatable. Shift ring 22
Have fifth connecting teeth 23, which are formed as internal teeth, which are guided on both sides into the shift sleeve 8 by guide wheels 24 which are stopped in the axial direction by retaining rings 25 and which , But can be rotated independently of the shift sleeve 8.

Further, the shift sleeve 8 has a sixth connecting tooth 26.
And the sixth connecting teeth 26 always cooperate with the shift sleeve 8 of the output member 6 even if the shift sleeve 8 is movable. The shift sleeve 8 is connected to the sixth connecting teeth 2.
It is guided exactly to the center by the joint action of the sixth and seventh connecting teeth 27.

In the illustrated embodiment, the output member 6 is the same as the differential gear case 31 as a driving member of the differential gear device, which is indicated as a whole. As is well known, the differential gear case 31 houses a differential bevel gear 32 and a driven bevel gear 33 that can be seen only once. The driven bevel gear 33 is connected to a shaft 34 which may be an axle drive shaft or a wheel drive shaft depending on the installation of the reduction gear device.

The operation of the reduction gear device according to the present invention is as follows. At the road speed (lower half in the figure), the input shaft 4 drives the output member 6 via the shift boss 5 and the shift ring 22. At this time, the fifth connecting teeth 23 of the shift ring 22 engage with the fourth connecting teeth 21 of the shift boss 5 and also engage with the seventh connecting teeth 27 of the output member 6. The shift sleeve 8 also has the sixth connecting teeth 26 and the seventh connecting teeth 2.
Since the gear is rotated at the same rotational speed via the shaft 7, there is no relative rotation between the shift sleeve 8 and the shift ring 22, and therefore there is no wear or loss. The shift sleeve 8 is centered with respect to the input shaft 4 via the shift ring 22 even when the end of the shift sleeve 8 on the side opposite to the seventh connecting teeth 27 is disturbed. In this position, the first connecting teeth 17 of the planet carrier 13
Are not engaged with the second connecting teeth 18 of the shift sleeve 8, the planetary carrier 13 is stationary, and the planetary gear 15 and the sun gear 11 are stationary because of the internal gear 10 fixed to the case 1. I have. Accordingly, the planetary gear set 7 does not cause any loss.

When the shift speed is shifted from the road speed to the outdoor speed (the upper half in the figure) through the neutral position, and the shift sleeve 8 is moved to the left in the figure, the fifth shift ring 22 Are disengaged from the shift sleeve 8 of the output member 6. Since the reduction gear is in the neutral position and the shift ring 22 can rotate freely within the shift sleeve 8, the reduction gear does not transmit torque. Then, when the shift sleeve 8 is further moved to the left, first, the second connecting teeth 18 of the shift sleeve 8 engage with the first connecting teeth 17 of the planet carrier 13. Since the planet carrier 13 is still freely rotatable, the two connecting teeth engage without problems. Only after a subsequent movement of the shift sleeve 8 does the fifth connecting tooth 2 of the shift ring 22
3 also meshes with the third connecting teeth 19 of the sun gear 11. Therefore, the switching is performed in two stages.

At the outdoor speed stage, the flow of power is as follows. First, the input shaft 4 drives the sun gear 11 via the shift boss 5 and the shift ring 22. Ring gear 1
Since 0 is stationary, the rotation speed of the planet carrier 13 is smaller than the rotation speed of the input shaft 4. The planet carrier 13 drives the shift sleeve 8 via the first connecting teeth 17 and the second connecting teeth 18, and the shift sleeve 8 is connected via the sixth connecting teeth 26 and the seventh connecting teeth 27 to the output member 6. Drive. At that time, there is a relative rotation between the shift ring 22 and the shift sleeve 8, but the value is merely a difference between the rotation speed of the input shaft 4 and the rotation speed of the output member 6.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a reduction gear device according to the present invention, in which a lower gear corresponding to an outdoor traveling gear is shown above a center axis, and a high gear corresponding to a road traveling gear below the center axis. It is shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 4 Input shaft 5 Shift boss 6 Output member 7 Planetary gear device 8 Shift sleeve 10 Internal gear ring gear 11 Sun gear 13 Planet carrier 17, 18, 19, 21, 23 Connecting tooth 22 Shift ring

Continuation of the front page (72) Inventor Klaus Lipitsuille Graz-Kosiat-Gatse, Austria 17/4/30

Claims (6)

[Claims] 1. A reduction gear unit is movable on a case (1), an input shaft (4), an output member (6), a planetary gear unit (7), and an output member (6) and is always connected thereto. A planetary gear set (7) fixedly connected to the case (1) and a sun gear (10) on the input shaft (4). 11) and a planet carrier (13) having first connecting teeth (17), and the first connecting teeth (1
7) is the second connecting tooth (18) on the shift sleeve (8).
A) a sun gear (11) is rotatably supported on an input shaft (4) and has third connecting teeth (19); b) a shift boss (5) Having a fourth connecting tooth (21),
And the rotation ring (22) has fifth connecting teeth (23) and is rotatably guided in the shift sleeve (8). A shiftable reduction gear for driving a motor vehicle. 2. The movable shift sleeve (8) and the output member (6) are connected by a sixth connecting tooth (26) and a seventh connecting tooth (27), which is an external tooth, and a fourth connection. Teeth (2
2. The shiftable reduction gear according to claim 1, wherein 1) has the same cross section as the seventh connecting tooth. 3. A sun gear (1) wherein a third connecting tooth (19) is provided.
3. The shiftable reduction gear device according to claim 2, wherein the external teeth on the collar (20) of 1) have the same cross section as the seventh connecting teeth (27). The output member (6) is a differential gear device (30).
2. The shiftable reduction gear set according to claim 1, wherein the transmission is geared to the drive member. 5. The output member (6) is a differential gear case (3).
5. The shiftable reduction gear according to claim 4, wherein the reduction gear is part of 1). 6. An input shaft (4) and an output member (6) are hollow shafts, and a shaft (34) driven by a differential gear device (30) is housed in an inner space of these hollow shafts. The shiftable reduction gear device according to claim 5, wherein: