# US 2018/0320786 A1 · Arrangement for actuating a shifting element

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- Number: US 2018/0320786 A1
- Document ID: US20180320786A1
- Status: Published application
- Kind: A1
- Application number: 15/773,227
- Filed: 2016-10-05
- Published: 2018-11-08
- Earliest claimed: 2015-11-09
- Assignees: ZF Friedrichshafen AG
- Applicants: ZF Friedrichshafen AG
- Inventors: Thomas PAULI; Stefan IGL; Thomas OBERBUCHNER; Anton EDER; Christoph BAUER; Stefan MICHL; Thomas BAUER; Ulf JARCZAK
- Web page: https://patentgrep.com/patent/US20180320786A1

## CPC

- F16H 63/3023: {the final output mechanisms comprising elements moved by fluid pressure (band brake actuating mechanisms F16H63/3003)}
- F16H 2063/3079: {Shift rod assembly, e.g. supporting, assembly or manufacturing of shift rails or rods; Special details thereof}
- F16H 2200/0026: comprising at least one creep low gear, e.g. additional gear for extra low speed or creeping
- F16H: GEARING

## Abstract

An arrangement for actuating at least one shifting element of a transmission. The arrangement has at least one hydraulically actuated actuating piston (1) for axially moving a shifting fork (2) of the shifting element.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

An arrangement for actuating at least one shifting element of a transmission, the arrangement comprising:
at least one hydraulically actuated actuating piston (1) which is provided for axial movement of a shifting fork (2) of the shifting element.

### Claim 12 (depends on 11)

The arrangement according to claim 11, wherein the actuating piston (1) that moves the shifting fork (2) is provided for electro-hydraulic engagement of a crawling gear.

### Claim 13 (depends on 11)

The arrangement according to claim 11, wherein the actuating piston (1) is functionally connected to a spring-loaded shifting rail (7) that carries the shifting fork (2).

### Claim 14 (depends on 11)

The arrangement according to claim 11, wherein the actuating piston (1) is guided within a piston space (6) provided in a housing (3) of the transmission.

### Claim 15 (depends on 14)

The arrangement according to claim 14, wherein the actuating piston (1) has a diameter step (11) and the diameter step (11) abuts against a stop (12) in the piston space (6) for setting a predetermined displacement path.

### Claim 16 (depends on 15)

The arrangement according to claim 15, wherein an adjustment washer (13) is associated with the diameter step (11).

### Claim 17 (depends on 11)

The arrangement according to claim 11, wherein a hydraulic medium acts upon a first end of the actuating piston (1) and an end of the shifting rail (7) is directly in contact with a second end of the actuating piston (1), and an end of the shifting rail (7), remote from the actuating piston (1), is in contact with a restoring spring (10) guided within a receiving bore (8) of the housing (3).

### Claim 18 (depends on 11)

The arrangement according to claim 11, wherein the actuating piston (1) is connected to an electro-hydraulic supply device.

### Claim 19 (depends on 18)

The arrangement according to claim 18, wherein the electro-hydraulic supply device comprises a control valve (4) which is connected, by way of at least one housing bore (14), to the piston space (6) for acting upon the actuating piston (1).

### Claim 20 (depends on 18)

The arrangement according to claim 18, wherein the electro-hydraulic supply device comprises a control valve (4) which is connected, by way of an external connecting line (5) and a connecting bore (9), to the piston space (6) for acting upon the actuating piston (1).

### Claim 21

An arrangement for actuating at least one shifting element of a transmission, the arrangement comprising:
at least one piston being slidably arranged within an axially extending piston space,
the at least one piston being coaxially aligned with a shifting rail and directly contacting an axial end of the shifting rail,
a shifting fork being fixed to the shifting rail,
the piston space being pressurizable by an electro-hydraulic supply device such that the piston being biased within the piston space, and
the piston axially biasing the shifting rail and the shifting fork which shift the shifting element of the transmission.

### Claim 22 (depends on 21)

The arrangement according to claim 21, wherein another axial end of the shifting rail, opposite the at least one piston, engages with a spring which biases the shifting rail in an axial direction toward the at least one piston.

### Claim 23 (depends on 21)

The arrangement according to claim 21, wherein the actuating piston (1) that moves the shifting fork (2) provides electro-hydraulic engagement of a crawling gear.