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A technology of pistons and equipment, applied in the field of shift transmissions, can solve problems such as structural space limitations of transmission regulators
Active Publication Date: 2020-07-31
WABCO GMBH
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Problems solved by technology
On the other hand, the installation space available for the transmission adjuster is usually narrowly limited due to the construction and design specifications of the vehicle manufacturer
Method used
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[0036] exist Figure 4 The piston-cylinder arrangement 1 .1 already explained above is illustrated in FIG. 1 , which is known from the prior art. In contrast, in figure 1 and figure 2 The piston-cylinder arrangement 1 according to the invention illustrated in , has a main piston 2 and two traction pistons 11 , 12 in a space-saving arrangement. For this purpose, a circular piston land 10 is formed on the main piston 2 , which has two circular axial depressions 30 , 31 facing away from each other. The first recess 30 is open towards the first traction piston 11 and the second recess 31 is open towards the second traction piston 12 . On the two traction pistons 11 , 12 are respectively formed two circular pushing sections 13 , 14 , which are adapted in terms of their geometry and dimensions to the two recesses 30 , 31 in the main piston 2 . The first traction piston 11 therefore has a first push section 13 which is aligned with the first depression 30 of the piston land 10 ....
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Abstract
The invention relates to a piston-cylinder assembly (1) comprising a cylinder housing (3), in which a main piston (2) and at least one dragg piston (11, 12) are axially slidably accommodated. The mainpiston (2) divides a piston chamber (7) of the cylinder housing (3) into two pressure chambers (8, 9) having variable volume, by means of which pressure chambers a pressure fluid can be applied to the main piston (2) on both sides and to the at least one drag piston (11, 12) on one side. The drag piston (11, 12) is axially slidably guided on a cylindrical outer lateral surface (38) of the main piston (2), which outer lateral surface extends laterally to a circular piston flange (10), which acts as an axial abutment and which points radially outward. The drag piston (11, 12) has, on the end thereof near the piston flange, a pushing portion (13, 14), which extends axially inward with respect to the piston flange (10). A displacement limiter (28) for limiting the displacement of the drag piston (11, 12) is arranged or formed on the cylinder housing (3). When the pressure is applied, the drag piston (11, 12) drags the main piston (2) along by means of the pushing section (13, 14) until the drag piston (11, 12) hits the displacement limiter (28). In order to achieve a small total axial length, according to the invention, the piston flange (10) has an axial recess (30, 31) and the pushing portion (13, 14) of the drag piston (11, 12) is geometrically designed in the a way that the pushing portion (13, 14) can interlockingly plunge into such associated recess (30, 31).
Description
technical field [0001] The invention relates to a piston-cylinder arrangement which can be operated by applying pressure with a fluid and which can be used, for example, as a transmission actuator with three shift positions for shifting operation of an automatic shift transmission. Background technique [0002] Piston-cylinder arrangements of this type generally have a double-acting main piston housed axially displaceable in a cylinder housing, which can be filled and emptied by means of two traction pistons through two axially facing away pressure chambers. to move between the two end positions and the intermediate position. To this end, the traction pistons can each drive the main piston in the axial direction as far as an axially central, fixed adjustment stroke limiter. If, for example, the first pressure chamber is filled with pressure fluid and the second pressure chamber is emptied, the main piston reaches one of the two end positions, wherein the traction piston, wh...
Claims
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