Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission... – Nonplanetary transmission is belt or chain gearing
Reexamination Certificate
2001-09-02
2004-09-07
Ho, Ha (Department: 3681)
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
Nonplanetary transmission is belt or chain gearing
C475S213000, C477S046000, C474S015000, C474S019000, C474S021000
Reexamination Certificate
active
06786844
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a contact pressure system that can be used especially in continuously variable transmissions, in a continuously variable transmission with a contact pressure system, as well as a method for operating such contact pressure systems and/or continuously variable transmissions.
2. Description of the Related Art
Continuously variable transmissions, as well as contact pressure systems for such continuously variable transmissions and methods for the operation of such continuously variable transmissions and contact pressure systems, are known. In a known continuously variable transmission that can be used especially as a motor vehicle transmission, there are provided two pairs of conical disks whose conical disks are arranged so that they can be moved relative to each other. An endless torque-transmitting means is placed around the pairs of conical disks. The transmission ratio between those pairs of conical disks is achieved by means of coordinated adjustment of the particular pairs of conical disks, specifically, in such a way that the spacing between the conical disks of the first pair of conical disks is enlarged when the spacing between the conical disks of the second pair of conical disks is reduced, and conversely. To retain a transmission ratio that has been set, a contact pressure system with a torque sensor is utilized, which essentially is loaded by a moment that, in terms of magnitude, also exists at the input side set of conical disks. The torque acting on the torque sensor is converted, via a ramp arrangement, into a linear force, which acts upon the set of conical disks. The transmission ratio is essentially retained in cooperation with a force that acts on the set of conical disks from the endless torque-transmitting means.
The object of the invention is to produce a differently designed contact pressure system, a differently designed continuously variable transmission, as well as a differently designed method for the operation of a contact pressure system or a continuously variable transmission.
In accordance with a particular aspect, the object of the invention is to produce a contact pressure system for continuously variable transmissions wherein the contact pressure force can be adjusted in accordance with or in approximation to the current requirement with a high degree of operational reliability.
In accordance with a particular aspect, the object of the invention is to produce a differently designed contact pressure system, a differently designed continuously variable transmission, as well as a differently designed method for the operation of a contact pressure system or a continuously variable transmission, by which under different load directions, as well as load direction changes, a high degree of operational reliability is achieved.
The problem is solved by a contact pressure system which has at least one feature of the features that are described in the following description or that are shown in the drawings.
The problem is further solved by a continuously variable transmission which has at least one feature of the features that are described in the following description or that are shown in the drawings.
The problem is further solved by a method for operating a continuously variable transmission and/or a contact pressure system, that has at least one feature of the features described in the following description or that are shown in the drawings.
SUMMARY OF THE INVENTION
The invention is particularly solved by a contact pressure system that has a torque sensor system, that, on the input side, can be loaded with a torque, and that, on the output side, produces a contact pressure force which depends on the torque that is applied on the input side. This contact pressure system further has a transfer unit that transfers that torque or that power. By a transfer unit in the sense of the present invention, what is especially to be understood is a unit that is arranged within a power or moment transfer section and that causes the output moment or the output power of that unit to be changed relative to the input moment or the input power.
In particular, in the sense of the present invention, the transfer unit is to be understood to be a transmission. The transfer unit is preferably formed mechanically. Thereby it is not intended to restrict the invention in any way. The transfer unit can also be hydraulic, or hydraulic and mechanical, or formed in other ways.
It is especially preferred in accordance with the present invention that the contact pressure system operates so that in a motor vehicle with an internal combustion engine and a continuously variable transmission, power or a moment introduced from the internal combustion engine into the contact pressure system is increased within the contact pressure system, and the output side of the contact pressure system loads the continuously variable transmission.
In accordance with the invention, there is provided, especially, a contact pressure system for a continuously variable transmission, which system is associated with at least one set of disks of the continuously variable transmission. Thereby it is provided that the contact pressure system has a torque sensor system or a torque sensor, and that the torque that is introduced on the input side into the torque sensor is different from the torque that is transmitted between the sets of disks, in particular by an endless torque-transmitting means.
It should be noted that, in the sense of the present invention, by input side is to be understood preferably the side of the contact pressure system or of the torque sensor that, in the flow of power or the flow of torque, faces an internal combustion engine when a contact pressure system in accordance with the invention is utilized in a motor vehicle with an internal combustion engine in order to generate a contact pressure force on a continuously variable transmission of that motor vehicle.
It should further be noted that by a contact pressure system in the sense of the present invention is to be understood a system that is loaded with a torque on the input side and that on the output side produces a force that is especially preferred to be linearly directed. The invention should not be restricted to such contact pressure systems. The contact pressure system in accordance with the invention can especially be designed as a dry operating or a wet operating contact pressure system.
In accordance with the invention, there is particularly provided a contact pressure system with at least one torque sensor system, whereby the contact pressure system or the torque sensor system has ramps that extend at an angle with respect to the circumferential direction of the contact pressure system or the torque sensor system, and that at least cooperate in bringing about a situation where the contact pressure force produced by the contact pressure system is dependent upon the torque. The torque dependence applies especially to a torque with which the contact pressure system or the torque sensor is loaded. For different torque directions or rotation directions different ramps are preferably provided. Further, preferably different freewheels are provided for the different rotation directions. The different freewheels are in that case coupled together in such a way to ensure that both freewheels will not simultaneously block a rotational movement, and thereby through the cooperative action of the freewheels movability in both directions of rotation is simultaneously blocked.
It should be noted that by the term “at an angle to the circumferential direction” in the sense of the present invention, it is especially to be understood that the angle is given within a circumferentially defined curved surface and/or by an angle to such a fictitious curved surface.
In accordance with the invention, there is particularly provided a contact pressure system with at least one torque sensor system, whereby the contact pressure system or the torque sensor system has at least
Deimel Andreas
Fritzer Anton
Mair Ulrich
Reik Wolfgang
Ho Ha
LuK Lamellen und Kupplungsbau Beteiligungs KG
Mangels Alfred J.
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