DE112016007118T5 - positioning - Google Patents

positioning

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Publication number
DE112016007118T5
DE112016007118T5 DE112016007118.3T DE112016007118T DE112016007118T5 DE 112016007118 T5 DE112016007118 T5 DE 112016007118T5 DE 112016007118 T DE112016007118 T DE 112016007118T DE 112016007118 T5 DE112016007118 T5 DE 112016007118T5
Authority
DE
Germany
Prior art keywords
cylinder housing
main piston
piston
region
opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE112016007118.3T
Other languages
German (de)
Inventor
Knut Tore Ljøsne
Bård Vestgård
Sven Bjørkgård
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kongsberg Automotive ASA
Original Assignee
Kongsberg Automotive ASA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kongsberg Automotive ASA filed Critical Kongsberg Automotive ASA
Priority to PCT/IB2016/054755 priority Critical patent/WO2018025071A1/en
Publication of DE112016007118T5 publication Critical patent/DE112016007118T5/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/123Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with fluid-operated stops
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26Generation or transmission of movements for final actuating mechanisms
    • F16H61/28Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30Hydraulic or pneumatic motors or related fluid control means therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051Linear output members
    • F15B2211/7053Double-acting output members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051Linear output members
    • F15B2211/7055Linear output members having more than two chambers

Abstract

A position actuator includes a cylinder housing forming a fluid chamber having a first region and a second region, a movable main piston disposed in the second region, a piston rod fixedly connected to the main piston and passing through an end of the cylinder housing, and a pressure ring. which is arranged in the first region and is axially movable relative to the main piston. The position actuator further includes a first opening extending through the cylinder housing for allowing a fluid to communicate with the first area between the main piston and the one end of the cylinder housing and a second opening extending through the cylinder housing to allow fluid to pass therethrough. communicating with the second region between the main piston and the other end of the cylinder housing, wherein at least one of the first region and the second region is pressurized to move the main piston to at least one of a first position and a second position.

Description

  • Background of the invention
  • Field of the invention
  • The present invention relates generally to powertrain positioning drives, and more particularly to a powertrain positioning drive of a vehicle.
  • Description of the Prior Art
  • It is known to provide a pneumatically actuated positioning drive for operating components in a powertrain, such as gears and clutches in a transmission. An example of such a positioning drive is in the US patent application 2003/0136254 by Hirano et al. Described. In this patent application, the positioning drive comprises a housing, a movable inner piston which is in a chamber within the housing, and a piston rod extending axially from the piston through one end of the housing. In such a positioning drive a partition divides a housing into two pressure chambers. In addition, the positioning drive from a final position in a middle position has a lower force, which is not preferred when used as a gearshift drive, it is desirable to have the highest power when switching out of gear and not when switching into gear.
  • In general, it is desirable to provide a positioning drive with a minimum number of components and a minimum size. In addition, it is desirable to provide a positioning drive that shifts out of a gear and then stops the positioning drive in a neutral position. Normally, pressure is built up to stop in the neutral position on both sides of the piston. Some manufacturers use relatively large drives or a fast control system to ensure that sufficient force is available in the neutral position, with both sides fully pressurized. However, the power is not high enough when both sides of the drive are pressurized to the maximum.
  • Summary of the invention
  • The present invention provides a positioning drive with a minimum number of parts and a minimum size.
  • In one embodiment, the present invention provides a positioning drive having a cylinder housing in which a fluid chamber is formed having a first region and a second region, a movable main piston disposed in the second region, a piston rod fixedly connected to the main piston and extending through an end of the cylinder housing and a pressure ring disposed in the first region and movable axially relative to the main piston. The positioning drive also includes a first passageway that extends through the cylinder housing to allow fluid to communicate with the first region between the main piston and the one end of the cylinder housing and a second passageway that extends through the cylinder housing to allow fluid to communicate with the second region the main piston and the other end of the cylinder housing can communicate. At least one of the first area and the second area is pressurized to move the main piston to at least one of a first position and a second position.
  • An advantage of the present invention is that a new positioning drive is provided which does not require two pressure chambers with a partition therebetween, saving space and cost and facilitating assembly. Another advantage of the present invention is that the positioning drive is a more compact positioning drive with unique positions, with comparatively high force being generated against the middle position (from both sides). Yet another advantage of the present invention is that the positioning drive has diameters to produce a greater force from each end position toward the middle position, as compared to the force from the middle position to the end positions, or at least the same force.
  • Other features and advantages of the present invention will become apparent as the same becomes better understood after reading the following description taken in conjunction with the accompanying drawings.
  • list of figures
    • 1 Figure 11 is a perspective view of a positioning drive illustrated, in accordance with one embodiment of the invention, in operative relation with a portion of a drive train.
    • 2 shows an enlarged partial view of the positioning drive 1 which is shown in a first operating position.
    • 3 shows an enlarged partial view of the positioning drive 2 , which is shown in a second operating position.
    • 4 shows an enlarged partial view of the positioning drive 2 , which is shown in a third operating position.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • As in 1-4 In accordance with one embodiment of the present invention, a pneumatic drive for moving components of a vehicle powertrain (not shown), such as gears and clutches in an automatic transmission or an automated manual transmission, is shown. In the in 1 illustrated embodiment of the positioning drive 10 used a shift rail 11 to move at least one gear in the transmission in and out of engagement. It should be recognized that the positioning drive 10 can be used in other embodiments for vehicles as the drive train. It should also be recognized that the positioning drive 10 a positioning drive for two positions or a positioning drive for three positions can be.
  • Regarding 2-4 includes the positioning drive 10 an axially extending cylinder housing 12 , The cylinder housing 12 has a generally cylindrical shape with a generally circular cross-section. The cylinder housing 12 has a wall 14 containing a fluid chamber 16 forms in it. The chamber 16 has a first area 18 , a second area 20 and a third area 21 , The first area 18 has a larger diameter than the second area 20 , and the second area 20 has a larger diameter than the third area 21 , The cylinder housing 12 extends axially between a first end 22 and a second end 24 and has a first shoulder or step 26 that is axially between the first area 18 and the second area 20 lies around an axial stop for a yet to be described pressure ring 52 to form, and a second shoulder or step 27 that is axially between the second area 20 and the third area 21 lies around an axial stop for a yet to be described main piston 30 to build. The cylinder housing 12 includes an opening or passage 28 that passes axially through the first end 22 runs and in fluid communication with the first area 18 the chamber 16 stands. The passage 28 allows a still to be described piston rod 38 through the first end 22 of the cylinder housing 12 runs. It should be recognized that the cylinder housing 12 can have any suitable shape.
  • The positioning drive 10 also includes a movable inner main piston 30 who is in the second area 20 the chamber 16 is arranged. The main piston 30 is generally cylindrical in shape. The main piston 30 has a diameter that is smaller than a diameter of the second area 20 of the cylinder housing 12 to make it possible for the main piston 30 axially in the second area 20 the chamber 16 of the cylinder housing 12 is moved. The main piston 30 has a central passage 32 which passes axially therethrough to the still to be described piston rod 38 take. The central passage 32 can be an area 33 include reduced diameter. The main piston 30 has an area 34 reduced diameter at one end. The area 34 reduced diameter has a diameter of less than a diameter D 2 of the main piston 30 is. The main piston 30 also has one or more grooves 36 which circulate around the circumference and extend radially therein and axially spaced to one or more seals to be described later 76 take. In one embodiment, the main piston 30 an integral, unitary and one-piece component. It should be recognized that the seals 76 on the wall 14 of the cylinder housing 12 abutment and air flow to the main piston 30 prevent over.
  • The positioning drive 10 further comprises a piston rod 38 which is connected to and axially protrudes from the main piston 30 to a component such as the shift fork 11 to press. The piston rod 38 has a first area 40 that passes axially through the passage 28 and in the central passage 32 runs, and a second area 42 that is axially from the first area 40 goes out and into the area 33 reduced diameter of the central passage 32 of the main piston 30 runs. The first area 40 has a first diameter D 1 , and the second area 42 has a second diameter that is less than the first diameter. In one embodiment, the piston rod 38 an integral, unitary and one-piece component. It should be recognized that in the cylinder housing 12 a seal around the piston rod 38 is arranged around and air flow past the piston rod 38 prevented. It should also be recognized that an end to the first area 40 via an opening (not shown) passing therethrough diametrically with the shift rail 11 can be coupled.
  • The positioning drive 10 also includes at least one opening or channel, generally at 44 shown in the wall 14 of the cylinder housing. The at least one opening 44 runs radially in the wall 14 of the cylinder housing 12 , In one embodiment, the at least one opening comprises 44 a first opening 46 , a second opening 48 , a third opening 50 and a fourth opening 51 , The first opening 46 runs on one side of the main piston 30 radially inward into the wall 14 of the cylinder housing 12 to allow a fluid such as air, with the first area 18 the chamber 16 between the main piston 30 and the first end 22 of the cylinder housing 12 to communicate. The second opening 48 extends radially on another side of the main piston 30 inward into the wall 14 of the cylinder housing 12 to add a fluid allow with the second area 20 and the third area 21 the chamber 16 at the second stage 27 of the cylinder housing 12 to communicate. The third opening 50 lies axially between the first opening 46 and the second opening 48 and extends radially inward into the wall 14 of the cylinder housing 12 to make fluid communication with the first area 18 and the second area 20 the chamber 16 at the first stage 26 of the cylinder housing 12 to allow. The fourth opening 51 runs on one side of a secondary piston to be described 60 radially inward into the wall 14 of the cylinder housing 12 to allow a fluid such as air, with the third section 21 the chamber 16 between the secondary piston 30 and the second end 24 of the cylinder housing 12 to communicate. It should be recognized that the opening 44 can have any suitable shape. It should also be recognized that the first and second openings 46 and 48 Work openings are and that the third and fourth openings 50 and 51 There are vents. It should also be appreciated that valves (not shown) for increasing or decreasing the fluid pressure for the chamber 16 can be provided.
  • The positioning drive 10 further shows a pressure ring 52 on the axially in the first area 18 the chamber 16 between the main piston 30 and the first end 22 of the cylinder housing 12 is arranged. The pressure ring 52 has a central hole 54 which passes axially through the area 34 reduced diameter of the main piston 30 take. The pressure ring 52 has an area at one end 56 reduced diameter. The area 56 reduced diameter has a diameter smaller than a diameter D 3 of the pressure ring 52 is. The pressure ring 52 has at least one groove 58 which is circumferentially and radially expanded therein to at least one seal to be described later 76 take. In one embodiment, the pressure ring is 52 an integral, unitary and one-piece component. It should be recognized that the seal 76 on the wall 14 of the cylinder housing 12 abuts and air flow to the pressure ring 52 prevented over. It should also be recognized that the pressure ring 52 forms a floating piston and relative to the main piston 30 is axially movable.
  • The positioning drive 10 further comprises a secondary or compensating piston 60 that is axially in the third area of the chamber 16 between the main piston 30 and the second end 24 of the cylinder housing 12 is arranged. The secondary piston 60 has a central cavity 62 axially expanded therein to a connector to be described later 70 take. The secondary piston 60 has an area at one end 64 reduced diameter. The area 64 reduced diameter has a diameter smaller than a diameter D 4 of the secondary piston 60 is. The area 64 reduced diameter has a flange at one axial end 66 which extends radially inward to engage with the connector 70 intervene. The secondary piston 60 has at least one groove 68 which is circumferentially and radially expanded therein to at least one seal to be described later 76 take. In one embodiment, the connector is 70 an integral, unitary and one-piece component. It should be recognized that the seal 76 on the wall 14 of the cylinder housing 12 abuts and air flow to the secondary piston 60 prevented over.
  • The positioning drive 10 contains a coupling element or connector 70 that is axially between the main piston 30 and the secondary piston 60 is arranged. The connector 70 is of generally cylindrical shape and extends axially. The connector 70 has an axial passage therethrough 72 to the second area 42 the piston rod 38 take. The connector 70 has a flange 74 which extends radially outward at one axial end and in the central cavity 62 of the secondary piston 60 is arranged to with the flange 66 of the area 64 reduced diameter of the secondary piston 60 co. It should be recognized that the secondary piston 60 is free, within the through the connector 70 to move defined lifting limits.
  • The positioning drive 10 also includes a seal 76 that in the groove 36 of the main piston 30 , the groove 58 of the pressure ring 52 and the groove 68 of the secondary piston is arranged. The grooves 36 . 58 and 68 are generally annular and rectangular in cross-section, but may be any suitable shape. The grooves 36 are radially inward into a wall of the main piston 30 and area 34 reduced diameter, the groove 58 is radially inward into a wall of the pressure ring 52 stretched and the groove 68 is radially inward into a wall of the secondary piston 60 extended. The seal 76 is generally annular. In one embodiment, the seal has 76 a generally rectangular cross-sectional shape. The seal 76 is made of a flexible elastomeric material such as rubber. The seal 76 is an integral, unitary and one-piece component. It should be recognized that the seal 76 may be any suitable type of seal, such as a lip seal, an o-ring, etc.
  • During operation of the positioning drive 10 , as in 2 illustrated, has the main piston 30 a first position when the main piston 30 near the first end 22 of the cylinder housing is when a gear of the drive train is engaged. When a flow of air in the first opening 46 flows, becomes the first area 18 put under pressure. When the pressure in the first area 18 greater than the pressure in the second area 20 is, the main piston moves 30 towards the second end 24 of the cylinder housing 12 in a middle, neutral, or third position to cause the gear to be disengaged and air to pass through the third port 50 vented to the atmosphere. As in 3 Illustrated has the main piston 30 a second position when the main piston 30 near the second end 24 of the cylinder housing 12 is when a gear is engaged in the drive train. When a flow of air through the second opening 48 flows, becomes the second area 20 put under pressure. When the pressure in the second area 20 greater than the pressure in the first area 18 is, the main piston moves 30 towards the first end 22 of the cylinder housing 12 to the third position, to cause the shift rail 11 disengages the gear, and air passes through the third port 50 vented to the atmosphere. As in 4 illustrated, has the main piston 30 a middle, neutral or third position where the main piston 30 axially between the first position and the second position in the first region 18 and in the second area 20 the chamber 16 is arranged when a gear of the drive train is disengaged. When airflow through the first opening 46 , the second opening 48 and the third opening 50 enters, both sides of the main piston 30 put under pressure. It should be appreciated that when the pressure in the first region equals the pressure in the second region 20 is, no movement of the main piston 30 takes place. It is also to be recognized that if only the page ( D2 ) of the main piston 30 is pressurized, then the page ( D4 ) of the secondary piston 60 the force is reduced to avoid too much force, and that when both sides ( D1 / D3 and D2 ) of the main piston are pressurized, the side ( D4 ) of the secondary piston 60 the force increases from the left towards the middle position. It should also be recognized that the positioning drive 10 for one or more valves (not shown) has three positions to fluid flow such as air flow into the chamber 16 to enable.
  • The present invention has been described in an illustrative manner. It is to be understood that the terminology used is intended to be words of a descriptive nature rather than limiting.
  • Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, the present invention may be practiced other than specifically described.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • US 2003/0136254 [0002]

Claims (27)

  1. Positioning drive with: a cylinder housing forming a fluid chamber having a first area and a second area, a movable main piston arranged in the second area, a piston rod fixedly connected to the main piston and passing through one end of the cylinder housing, a pressure ring disposed in the first region and movable axially relative to the main piston, a first opening passing through the cylinder housing for allowing fluid to communicate with the first area between the main piston and the one end of the cylinder housing, and a second opening extending through the cylinder housing to allow fluid to communicate with the second area between the main piston and the other end of the cylinder housing, at least one of the first area and the second area being pressurized to urge the main piston into to move at least one of a first position and a second position.
  2. Positioning drive to Claim 1 wherein the second region has a diameter greater than the diameter of the first region.
  3. Positioning drive to Claim 1 wherein the first opening on one side of the main piston extends radially inwardly into the cylinder housing to receive pressurized air.
  4. Positioning drive to Claim 3 wherein the second opening on the other side of the main piston extends radially inwardly into the cylinder housing to receive compressed air.
  5. Positioning drive to Claim 4 with a third opening disposed axially between the first opening and the second opening and extending radially inwardly into the cylinder housing to vent air into the atmosphere.
  6. Positioning drive to Claim 5 with a secondary piston disposed in the second chamber of the housing between the main piston and the other end of the cylinder housing.
  7. Positioning drive to Claim 6 with a coupling member disposed axially between the main piston and the secondary piston and coupling the secondary piston to the piston rod to allow the secondary piston to move within stroke limits defined by the coupling element.
  8. Positioning drive to Claim 6 wherein the housing has a fourth opening communicating with the second chamber for venting air into the atmosphere.
  9. Positioning drive to Claim 1 wherein the main piston has a first diameter.
  10. Positioning drive to Claim 9 wherein the main piston has a reduced diameter portion having a second diameter that is smaller than the first diameter.
  11. Positioning drive to Claim 1 wherein the cylinder housing has a step formed between the first region and the second region to stop axial movement of the pressure ring.
  12. Positioning drive to Claim 1 , wherein the pressure ring forms a floating piston.
  13. Positioning drive with: a cylinder housing forming a fluid chamber having a first area and a second area, the second area having a larger diameter than the first area, a movable main piston disposed in the second region a piston rod fixedly connected to the main piston and passing through one end of the cylinder housing, a pressure ring forming a floating piston disposed in the first region and movable axially relative to the main piston, a first opening extending through the cylinder housing to allow fluid to communicate with the first area between the main piston and the one end of the cylinder housing, a second opening extending through the cylinder housing to allow fluid to communicate with the second area between the main piston and the other end of the cylinder housing, wherein at least one of the first region and the second region is pressurized to move the main piston to at least one of the first position and the second position, and wherein the cylinder has a step formed between the first region and the second region to stop axial movement of the pressure ring.
  14. Positioning drive to Claim 13 wherein the first opening on one side of the main piston extends radially inwardly into the cylinder housing to receive pressurized air.
  15. Positioning drive to Claim 14 wherein the second opening on another side of the main piston extends radially inwardly into the cylinder housing to receive compressed air.
  16. Positioning drive to Claim 15 with a third opening located axially between the first opening and the second opening and extending radially inwardly into the cylinder housing to vent air into the atmosphere.
  17. Positioning drive to Claim 16 wherein the housing has a fourth opening communicating with the second chamber for venting air into the atmosphere.
  18. Positioning drive with: a cylinder housing forming a fluid chamber having a first area and a second area, the second area having a larger diameter than the first area, a main movable piston disposed in the second region, the main piston having a first diameter and a reduced diameter portion having a second diameter smaller than the first diameter; a piston rod fixedly connected to the main piston and passing through one end of the cylinder housing, a pressure ring forming a floating piston disposed in the first region and movable axially relative to the main piston, an opening extending radially inwardly into the cylinder housing on one side of the main piston to allow pressurized fluid to communicate with the first region between the main piston and the one end of the cylinder housing, a second opening extending radially inwardly on the other side of the main piston into the cylinder housing to allow pressurized fluid to communicate with the second area between the main piston and the other end of the cylinder housing; a third opening located axially between the first opening and the second opening, which extends radially inwardly into the cylinder housing to vent air into the atmosphere, a fourth opening communicating with the second area to vent air to the atmosphere, wherein at least one of the first region and the second region is pressurized to move the main piston to at least one of a first position and a second position, and wherein the cylinder housing has a step formed between the first region and the second region to stop axial movement of the pressure ring.
  19. Positioning drive to Claim 18 with a secondary piston disposed in the second region of the housing between the main piston and the other end of the cylinder housing.
  20. Positioning drive to Claim 19 with a coupling member disposed axially between the main piston and the secondary piston and coupling the secondary piston to the piston rod to allow the secondary piston to move within stroke limits defined by the coupling element.
  21. Gear unit with: at least one shift rail for actuating at least one gear, at least one drive, which cooperates with the at least one shift rail, and wherein the at least one drive comprises a cylinder housing forming a fluid chamber having a first region and a second region, a movable main piston disposed in the second region, a piston rod fixedly connected to the main piston and passing through an end of the cylinder housing, a pressure ring disposed in the first region and axially movable relative to the main piston, a first opening extending through the cylinder housing to allow fluid to communicate with the first region between the main piston and the one end of the cylinder housing and having a second opening passing through the cylinder housing to allow fluid to communicate with the second area between the main piston and the other end of the cylinder housing, wherein at least one of the first area and the second area is pressurized to at least one of the main piston from a first position and a second move position.
  22. Gear unit after Claim 21 wherein the first opening on one side of the main piston extends radially inwardly into the housing to receive pressurized air.
  23. Gear unit after Claim 22 wherein the second opening on another side of the main piston extends radially inwardly into the cylinder housing to receive compressed air.
  24. Gear unit after Claim 23 with a third opening that lies axially between the first opening and the third opening and extends radially inward into the cylinder housing to vent air into the atmosphere.
  25. Gear unit after Claim 24 wherein the housing has a fourth opening communicating with the second chamber for venting air into the atmosphere.
  26. Gear unit after Claim 25 with a secondary piston disposed in the second chamber of the housing between the main piston and the other end of the cylinder housing.
  27. Gear unit after Claim 26 with a coupling member disposed axially between the main piston and the secondary piston and coupling the secondary piston to the piston rod to allow the secondary piston to move within stroke limits defined by the coupling element.
DE112016007118.3T 2016-08-05 2016-08-05 positioning Pending DE112016007118T5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2016/054755 WO2018025071A1 (en) 2016-08-05 2016-08-05 Position actuator

Publications (1)

Publication Number Publication Date
DE112016007118T5 true DE112016007118T5 (en) 2019-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE112016007118.3T Pending DE112016007118T5 (en) 2016-08-05 2016-08-05 positioning

Country Status (3)

Country Link
CN (1) CN109642592A (en)
DE (1) DE112016007118T5 (en)
WO (1) WO2018025071A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018214006A1 (en) * 2018-08-20 2020-02-20 Zf Friedrichshafen Ag Hydraulic system and automotive transmission

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4773300A (en) * 1983-10-08 1988-09-27 Wabco Westinghouse Fahrzeugbremsen Gmbh Three-position working cylinder having dual concentric pistons
JP2000120614A (en) * 1998-08-12 2000-04-25 Hitachi Constr Mach Co Ltd Floating type cushion device of hydraulic cylinder
JP3978717B2 (en) 2002-01-22 2007-09-19 Smc株式会社 3-position stop cylinder
SE531713C2 (en) * 2005-11-30 2009-07-14 Kongsberg Automotive As Cylinder with fixed positions 6
CN201062601Y (en) * 2007-07-27 2008-05-21 毛信强 Two-stage dashpot plunger type cylinder
US8453557B2 (en) * 2009-08-28 2013-06-04 GM Global Technology Operations LLC Piston actuator assembly
DE102011005680A1 (en) * 2011-03-17 2012-10-04 Zf Friedrichshafen Ag Switching cylinder arrangement
CN104684646A (en) * 2012-11-15 2015-06-03 山特维克知识产权股份有限公司 Mechanical actuator
CN103994125B (en) * 2014-05-20 2016-01-13 长沙达豪机械设备有限公司 Adjustable Bidirectional cushion cylinder
CN105298978B (en) * 2015-11-20 2018-02-02 常州海宏液压设备有限公司 Pulling force floating buffer Vertical Mill hydraulic jack

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CN109642592A (en) 2019-04-16

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