JP2007502942A - Continuously variable transmission - Google Patents

Abstract

The present invention relates to a continuously variable transmission comprising at least two rotating transmission components (1, 2) that interact with each other via a rotating transmission adjustment component (3). According to the invention, the position of the bearing (4) for the transmission component (1,2) is located in the radial region (13) of the bearing in the radial direction, which allows a reduction in the device space To.

Description

The present invention relates to a continuously variable transmission including at least two rotating transmission components that interact with each other via rotating transmission adjustment components.

As this type of continuously variable transmission, for example, a conical friction ring transmission is known from European Patent Publication No. 0877861. British Patent No. 1,296,827, US Pat. No. 5,601,509, US Pat. No. 4,393,964, German Patent Publication No. 19740406 or German Patent Publication No. 19958073 disclose alternative arrangements.

All these continuously variable transmissions share in common that at least one of the transmission components, preferably one of the rotating transmission components, is supported on the housing via a rotating bearing. Here, a rolling bearing is used in particular, but a sliding bearing can also be used for this without any problem.

This type of bearing typically includes a stationary region located in contact with the housing and a rotating region that rotates with the corresponding transmission component. In a typical rolling transmission, both areas are formed by a corresponding plurality of rings on which the rolling bearings rotate, one of which is fixed to the housing and the other ring to the transmission component. Yes. Even plain bearings are provided with a plurality of surfaces or regions that are fixed to the housing or that rotate with the transmission components that are each supported.

In general, since a sufficient bearing load can be formed, it is understood that the structure space required for this type of bearing is relatively large in the continuously variable transmission. It is an object of the present invention to structurally improve a continuously variable transmission so that large or high performance bearings can be stored without causing significant structural space expansion.

As a solution to this problem, the present invention comprises at least two rotating transmission components that interact with each other via rotating transmission adjustment components, and at least one of the rotating transmission components. A continuously variable transmission is proposed in which one of the continuously variable transmissions is capable of being continuously variable, in which at least one of the rotating transmission components has a stationary region in contact with the housing on the one hand and a corresponding rotational region on the other. It is characterized in that it is supported on the housing via a rotating bearing that is in contact with the part and that the stationary area has a smaller diameter than the rotating area.

This arrangement has the advantage that the bearing diameter can be reduced to a minimum without adversely affecting the inherent strength of the transmission component, especially in bearing parts where the shaft is not guided through the housing. have. Of course, in bearing parts where the shaft passes through the housing, this minimum is limited in the downward direction by the minimum diameter of the respective shaft, but this arrangement nevertheless provides the aforementioned advantages.

It is particularly advantageous that the structural space for the bearing can be reduced to a minimum value if the stationary region is arranged in the rotational region in the radial direction. If the bearings are arranged in the radial direction in the region of the transmission component being supported, the required construction space can be reduced, in particular, to a minimum value. This method eliminates the need for additional axial structural space for the bearing. This arrangement is such that when the bearing bears one of the rotating transmission components of the continuously variable transmission, the transmission component is normally spaced radially from its rotational axis in the continuously variable transmission component. Since it has a region in which the corresponding bearing can be accommodated without any problem, it can be realized without any problem.

In this regard, the concepts of “radial direction” and “axial direction” are each directed to transmission components relating to the bearings of the present invention.

The present invention is therefore particularly feasible if the transmission component is conical in a bearing mounted radially in the transmission. Therefore, the present invention is particularly feasible in conical transmissions or conical ring transmissions that usually require a relatively large pressure force, i.e. a relatively large bearing, in order to allow a sufficiently high torque transmission under all driving conditions. It is.

The bearing is preferably mounted on the journal bearing of the housing which forms a flange in the corresponding transmission component in order to receive the bearing load directly and economically in the housing.

Due to the corresponding arrangement of the invention, the bearing load is transmitted between the bearing and the housing, and particularly high bearing loads can be received, so that the invention is suitable for cooperation with rolling bearings.

If the stationary area is made up of the housing itself and / or the rotating area is made up of the corresponding transmission components, structural space can be saved in the radial direction. The former is considered to be unsuitable as a direct rotating surface because of its material, whereas the latter is usually made of a material of a transmission component, for example, a friction ring rolling on it, so that its rotation and friction characteristics Since it has already been designed as a rolling element, it can be used as an ideal rotating surface, particularly as a rotating surface for the corresponding rolling element.

Typically, this type of continuously variable transmission is provided with at least one thrust bearing for receiving the axial pressure of at least one transmission component. This thrust bearing is also preferably used for radial support of the drive pinion or the output pinion. Usually, the drive pinion or output pinion generates very little force in the radial direction, but this can be received by a thrust bearing. As long as this is the case, the radial bearing required for the continuously variable (adjusting) transmission can be designed by the method of the present invention, and there is no need to consider the pinion. It is now possible to place the radial bearing of the continuously variable (adjusting) transmission close to this transmission or in the individual transmission components, but nevertheless drive the pinion reliably. Can be supported economically. This dual use of thrust bearings, axial pressing of the continuously variable transmission and receiving radial force of the drive pinion, is independent of other features of the present invention of continuously variable transmissions, It will be appreciated that it can be advantageously used for structural space reduction.

The transmission can include a parking lock disposed in the power transmission system that encompasses the transmission, behind the transmission, or in front of the output pinion. A parking lock can be placed on the input shaft of the transmission, either incrementally or alternatively. This kind of parking lock is particularly effective from the impact acting on the transmission when the vehicle is parked because the output shaft or the output pinion is already cut off and the impact does not reach the continuously variable transmission. Can be protected. It will be appreciated that a parking lock arranged in this manner is preferred in a transmission, particularly in a vehicle transmission, regardless of other features of the invention.

The transmission component supported by the inner bearing preferably comprises a seal groove in which a seal is arranged, in which the seal protrusion of the housing can project, in particular. This also makes it noticeable in continuously variable (regulatory) transmissions with respect to the seals, i.e. irrespective of the formation of the bearings, since at least a part of the seal is thus arranged in the respective transmission component. In addition, the continuously variable (adjusting) transmission is equipped with a transmission component having a large radial distance from the shaft of the normal transmission component, so that a suitable groove can be formed in this. Can be attached.

Further advantages, objects and features of the present invention are illustrated in the accompanying drawings illustrating the transmission of the present invention.

The transmission shown in the drawing comprises an input cone 1 and an output cone 2 which interact via a friction ring 3. The output cone 2 is supported by a bearing according to the invention, shown as an inner bearing 4, a radial bearing 9 and a thrust bearing 10. On the other hand, the input cone 1 is supported by only two radial bearings 9 and one thrust bearing 10, in which the bearings 4, 9 and 10 apply the pressure contact force required for pressing the friction ring 3. .

It will be appreciated that the inner bearing of the present invention is also applicable to the input cone 1, particularly at the bottom of the cone.

The inner bearing 4 of the present invention includes two inner rolling bearings 5 and 6 arranged in the notch 14 of the output cone 2. Both inner rolling bearings 5 and 6 are provided with inner rings 7 and 8 which are also in contact with the housing 11 or are fixed to the journal bearing 12 of the housing 11 which forms a flange in the notch 14. The rolling bodies of both inner rolling bearings 5 and 6 roll on a rotation region 13 formed by a part of the surface of the notch 14 of the output cone 2 on the cone side. This arrangement makes it possible to use the largest possible rolling element with the smallest diameter inner rolling bearing.

In addition, the transmission presented here includes an input shaft 15 that transmits input torque to the input cone 1 via a planetary gear set 16. Here, the planetary gear set 16 is formed so that the sun gear of the planetary gear set 16 can be selectively fixed to the planetary gear via the synchro mechanism 17, and the planetary gear rotates through the direction change limited thereby. When continuing, a reverse gear is realized, and when the planetary gear is fixed, the transmission rotates in the forward direction. As a result, the arrangement of the entire structure is extremely miniaturized, and in normal driving, that is, in forward traveling, the planetary gear Does not contribute to the overall transmission loss, so it drives with minimal loss.

The taken-in torque is transmitted from the drive cone 1 to the output cone 2 via the friction ring 3, and various gear ratios are realized depending on the position of the friction ring 3 (two possible positions are shown in the drawing). It is possible. Torque is transmitted from the output cone 2 to the pressing device 18, which is also pivotally mounted on the output shaft 19 in a non-rotatable manner. On the output shaft 19, a differential pinion 20 that is directly meshed with a differential 21 of a vehicle drive system is located.

The pressing device 18 includes a pressing body 18 and a rolling body 22 that runs in a track in contact with the output cone 2, and this track is supported by the biasing force of the spring 23 of the spring 23 as a pressing force. The pressing device is lifted from the cone 2 in the axial direction, so that the cone 2 is pressed more strongly against the friction ring 3 and, as already explained, at this time the bearings 4, 9 and 10 are subject to this variation. Deal with the pressure contact force. In this way, the pressure contact force acting on the friction ring 3 can be selected in relation to the transmitted torque, so that loss at low torque can be avoided and sufficient pressure contact force is ensured at high torque.

The thrust bearing 10 itself of the output cone 2 can also be formed as the inner bearing 4 in the present invention. However, in the embodiment presented, the embodiment presented is not an example since the output cone thrust bearing 10 is also used to receive the radial force of the differential pinion.

This dual use of thrust bearings, pressing the continuously variable transmission in the axial direction and receiving the force in the radial direction of the drive pinion, is related to other features of the present invention of the continuously variable transmission. It will be appreciated that it can be advantageously used to reduce structural space. In the embodiment presented, the thrust bearing 10 is realized as a four-point bearing, which makes it possible to carry out the above-mentioned problem particularly effectively.

A parking lock 24 is attached to the conical side directly adjacent to the differential pinion 20. This includes a pinion that secures the parking lock 24 to the housing 11 when the vehicle is completely stopped. Due to the parking lock position directly adjacent to the pinion 20 or in front of the differential pinion 20 with respect to the power transmission system, the transmission is particularly effectively protected from impacts that may act on it when the vehicle is parked. The In this regard, it is preferable that the parking lock 24 is disposed on the rear side of the transmission of the power transmission system.

A groove 25 in which a corresponding protrusion 26 of the housing 11 protrudes is attached in the cone provided with the inner bearing 4 and further in the bottom of the cone. Between the projection 26 and the surface of the groove, a seal (not shown) can be arranged that seals and separates the chamber receiving the friction ring 3 from the chamber receiving the notches 14 or the bearings 4, 9-10. This prevents fluid from one chamber, such as traction fluid for a friction ring, from mixing with fluid from another chamber, such as lubricating oil.

1 shows a continuously variable transmission according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input cone 2 Output cone 3 Friction ring 4 Inner bearing 5 Inner roller bearing 6 Inner roller bearing 7 Inner ring 8 Inner ring 9 Radial bearing 10 Thrust bearing 11 Housing 12 Journal bearing 13 Rotating area 14 Notch 15 Input shaft 16 Planetary gear 17 Sync mechanism 18 Pressing device 19 Output shaft 20 Differential pinion 21 Differential 22 Rolling body 23 Spring 24 Parking lock 25 Seal groove 26 Seal protrusion

Claims (16)

At least two of the rotating transmission component parts (1, 2) are provided with at least two rotating transmission component parts (1, 2) interacting via a rotating transmission adjustment component (3). One of the transmission components (1, 2, 3) can contact one side of the stationary region (7, 8) with the housing (11) and the other side with a corresponding rotational region (13). It is a continuously variable transmission that is supported by a housing (11) via a rotating bearing (4) provided in contact with a transmission component (2). A continuously variable transmission characterized by having a smaller diameter.
Transmission according to claim 1, characterized in that the stationary area (7, 8) is arranged in the rotating area (13).
Transmission according to claim 1 or 2, characterized in that the bearing (4) is arranged in the region of the transmission component (2) that is supported in the radial direction.
4. A transmission according to claim 1, wherein the rotating bearing (4) supports both rotating transmission components.
5. Transmission according to claim 1, wherein at least one of the rotating transmission components (1, 2) is a cone.
Transmission according to claim 5, characterized in that both rotating transmission components (1, 2) are conical and the transmission adjusting component is a friction ring.
Transmission according to any of the preceding claims, characterized in that the housing (11) comprises a journal bearing (12) forming a flange in the corresponding transmission component (1, 2).
Transmission according to any one of the preceding claims, characterized in that the bearing (4) is a rolling bearing.
Transmission according to any one of the preceding claims, characterized in that the stationary region (7, 8) is formed by a housing (11).
Transmission according to any one of the preceding claims, characterized in that the rotation region (13) is formed by a corresponding transmission component (2).
2. A thrust bearing for receiving a radial contact force of at least one transmission component is used for radial support of at least a drive pinion or an output pinion. The transmission in any one of -10.
The transmission according to any one of claims 1 to 11, further comprising a parking lock (24) disposed on the rear side of the transmission in a power transmission system including the transmission.
13. Transmission according to claim 12, characterized in that a parking lock is arranged in front of the output pinion (20).
14. A transmission according to claim 1, comprising a parking lock (24) arranged on the output shaft (19) of the transmission.
15. A transmission component (2) supported by an inner bearing (4) comprises a sealing groove (25) in which a seal is arranged, according to any one of the preceding claims. transmission.
16. Transmission according to claim 15, characterized in that a sealing projection (26) of the housing projects into the sealing groove (25).

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