US20120024249A1 - Hydraulic backlash compensating element - Google Patents
Hydraulic backlash compensating element Download PDFInfo
- Publication number
- US20120024249A1 US20120024249A1 US13/196,017 US201113196017A US2012024249A1 US 20120024249 A1 US20120024249 A1 US 20120024249A1 US 201113196017 A US201113196017 A US 201113196017A US 2012024249 A1 US2012024249 A1 US 2012024249A1
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- US
- United States
- Prior art keywords
- compensating element
- valve
- housing
- backlash compensating
- hollow ball
- 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.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/024—Belt drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2250/00—Camshaft drives characterised by their transmission means
- F01L2250/02—Camshaft drives characterised by their transmission means the camshaft being driven by chains
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2250/00—Camshaft drives characterised by their transmission means
- F01L2250/04—Camshaft drives characterised by their transmission means the camshaft being driven by belts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/01—Absolute values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0802—Actuators for final output members
- F16H2007/0806—Compression coil springs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/0848—Means for varying tension of belts, ropes, or chains with means for impeding reverse motion
- F16H2007/0859—Check valves
Definitions
- the present invention relates to a hydraulic backlash compensating element for an internal combustion engine.
- a hydraulic backlash compensating element of the abovementioned type is known from the general prior art.
- the hydraulic backlash compensating element has an oil-filled piston/cylinder unit, a check valve and a spring. Hydraulic backlash compensating elements are encountered in valves, support elements or tensioning elements for tensioning a traction means in a traction drive of an internal combustion engine, for example.
- a piston Inside a housing there is a piston with an integrated check valve.
- the two elements can be moved relative to one another, form a defined leakage gap at the contact surface and are pushed apart by an internal spring. While the piston enters the housing under the action of an external force, a high pressure arises in the oil-filled pressure chamber formed by the housing and the piston when the check valve is closed. A small quantity of oil is discharged to the surroundings through the very narrow leakage gap. When the external force acting on the piston weakens, the internal spring pushes the hydraulic element apart. This gives rise to a differential pressure which opens the check valve, and the extra quantity of oil required for the compensating process flows in.
- the check valve has a valve element which interacts with a valve seat.
- a valve spring is provided in the check valve, pressing on the valve element in the direction of the valve seat in order in this way to close an inlet duct.
- the check valve should open and close precisely.
- the opening and closing times and the speed of response of the check valve depend, inter alia, on the mass of the valve element.
- various malfunctions occur in conventional check valves having steel balls as valve elements, e.g. noise, bouncing of the valve element, inadequate closure and wear on the valve element and the valve seat.
- a hydraulic backlash compensating element for an internal combustion engine which comprises a housing that has an opening and a pressure-actuated piston which is mounted in the opening of the housing that has a check valve which can allow oil to flow into the housing and has a valve seat and a valve element arranged movably within therein
- the object is achieved by virtue of the fact that the valve element of the check valve is a hollow ball.
- the particular advantage here is that a hollow ball is lighter than a ball made of solid material. Owing to the lower mass, there is an improvement in the dynamic response of the valve element, leading to improvements in the response times of the check valve of the hydraulic backlash compensating element.
- Another advantage is that the force with which the valve element strikes against the valve seat decreases with the weight of the valve element. As a result, the wear on the valve seat and on the valve element is reduced.
- the hollow ball be produced from a sintered inorganic material.
- the valve elements used in hydraulic backlash compensating elements are solid steel balls having a diameter of 2-3 mm.
- a special manufacturing process is required. This process has been developed only recently by IFAM (Fraunhofer—Institut fürtechnikstechnik und Angewandte Materialforschung) and hollomet GmbH, see also WO 2001/54846 A2. Expanded polystyrene balls are used as the starting material. In a fluidized bed process, an air stream blows the balls upwards and keeps them suspended while a suspension of metal powder and binder is sprayed onto them from above.
- a heat treatment is carried out: in a first step, all the organic constituents, the polystyrene and the binder vaporize. The residual materials are gaseous and escape through the pores in the metal layer. What remains is a fragile metal ball. This is sintered at just below the melting temperature. During this process, the metal powder granules combine and the shell becomes hard and impermeable. The ball is now sufficiently robust to be ground in a grinding machine.
- the wall thickness can be set to thicknesses of between a few tenths of a millimeter and one millimeter.
- a hollow ball produced in the manner described has a low inertia, on the one hand, and, given the appropriate wall thickness, also has the required robustness, on the other.
- a hollow ball produced by this process is therefore eminently suitable as a valve element in a check valve subjected to dynamic loading in a hydraulic backlash compensating element.
- the hollow ball have a filling.
- a partially filled hollow ball makes it possible to optimize the noise behavior of the valve since the noises associated with the impact of the valve element in the valve seat are attenuated.
- the rebounding of the valve element during closure onto the valve seat is likewise reduced.
- the filling can be composed of various materials. Gases, gels or colloids can be used as a filling, for example, depending on the application. Solids, sand, powder or even liquids are likewise conceivable, and the liquids in turn may differ in their viscosity.
- the wall of the hollow ball be composed of layers of different materials and/or that the wall be composed of a porous material.
- a wall of porous material can optimize the rebound behavior.
- Another variant envisages combining a layer of porous material with a hardened layer. It is likewise conceivable to use a harder substrate material, which is provided with a rubber coating in order to protect the valve seat and the valve element from wear.
- FIG. 1 shows a hydraulic backlash compensating element embodied as a hydraulic belt tensioner
- FIG. 2 shows a hydraulic backlash compensating element embodied as a hydraulic chain tensioner
- FIG. 3 shows a hydraulic backlash compensating element embodied as a support element
- FIG. 4 shows a check valve in cross section
- FIG. 5 shows a valve element as a hollow ball
- FIG. 6 shows a hollow ball with filling material
- FIG. 7 shows a hollow ball, the wall of which is composed of layers of different materials.
- FIGS. 1 to 3 Various embodiments of hydraulic backlash compensating elements are depicted in FIGS. 1 to 3 . Since the construction of all three embodiments is virtually identical, the description of the figures will be given by way of example for FIG. 2 , which shows a hydraulic backlash compensating element 1 designed as a hydraulic chain tensioner. Inside a housing 2 there is a piston 3 with an integrated check valve 4 . The piston 3 is arranged within the housing 2 in a manner which allows longitudinal movement, and the two elements are pushed apart by an internal spring 6 . A defined leakage gap 10 is formed between the outer surface of the piston 3 and the inner surface of the housing 2 . While the piston 3 enters the housing 2 under the action of an external force, e.g.
- an external force e.g.
- the check valve 4 has a valve element 7 which interacts with a valve seat 5 .
- a valve spring 11 is provided in the check valve 4 . This pushes the valve element 7 in the direction of the valve seat 5 and thus closes the oil feed opening 13 as the differential pressure falls.
- the opening and closing times and the speed of response of the check valve 4 depend on the mass of the valve element 4 . The lighter the valve element 7 , the more rapid is the response of the check valve 4 . For this reason, the valve element 7 is embodied as a hollow ball in order to reduce the mass.
- FIG. 4 shows a detail view of the check valve 4 in the closed state when the valve spring 11 is pressing the valve element 7 into the valve seat 5 .
- FIG. 5 shows the valve element 7 as a hollow ball in cross section. The wall thickness 9 of the hollow ball can vary, depending on requirements.
- FIGS. 6 and 7 show further possible embodiments of the valve element 7 for achieving optimum closing and opening behavior of the check valve 4 of the hydraulic backlash compensating element 1 .
- FIG. 6 shows a valve element 7 as a filled hollow ball.
- the filling 8 makes it possible to optimize the noise behavior of the check valve 4 since the noises associated with the impact of the valve element 7 in the valve seat 5 are attenuated. The rebounding of the valve element 7 during closure onto the valve scat 5 is likewise reduced.
- FIG. 7 shows a valve element 7 embodied as a hollow ball, the wall 9 of which is composed of layers of different materials. With surface layers of different hardness, it is possible to reduce both the wear on the valve element 7 and the wear on the valve seat 5 .
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Check Valves (AREA)
Abstract
A hydraulic backlash compensating element for an internal combustion engine, which has a housing in which a pressure-actuated piston is mounted The piston has a check valve via which oil can flow into the housing, and the check valve has a valve seat and a valve element arranged movably therein. The valve element is a hollow ball.
Description
- This application claims the priority of DE 2010 033 091.4 filed Aug. 2, 2010, which is incorporated by reference herein.
- The present invention relates to a hydraulic backlash compensating element for an internal combustion engine.
- A hydraulic backlash compensating element of the abovementioned type is known from the general prior art. The hydraulic backlash compensating element has an oil-filled piston/cylinder unit, a check valve and a spring. Hydraulic backlash compensating elements are encountered in valves, support elements or tensioning elements for tensioning a traction means in a traction drive of an internal combustion engine, for example.
- Inside a housing there is a piston with an integrated check valve. The two elements can be moved relative to one another, form a defined leakage gap at the contact surface and are pushed apart by an internal spring. While the piston enters the housing under the action of an external force, a high pressure arises in the oil-filled pressure chamber formed by the housing and the piston when the check valve is closed. A small quantity of oil is discharged to the surroundings through the very narrow leakage gap. When the external force acting on the piston weakens, the internal spring pushes the hydraulic element apart. This gives rise to a differential pressure which opens the check valve, and the extra quantity of oil required for the compensating process flows in. The check valve has a valve element which interacts with a valve seat. In general, a valve spring is provided in the check valve, pressing on the valve element in the direction of the valve seat in order in this way to close an inlet duct. In order to obtain effective damping in the hydraulic backlash compensating element, it is important that the check valve should open and close precisely. The opening and closing times and the speed of response of the check valve depend, inter alia, on the mass of the valve element. With increasingly dynamic processes in the internal combustion engine, various malfunctions occur in conventional check valves having steel balls as valve elements, e.g. noise, bouncing of the valve element, inadequate closure and wear on the valve element and the valve seat.
- It is therefore the underlying object of the invention to specify a hydraulic backlash compensating element which has a check valve that avoids the above-mentioned disadvantages.
- According to the invention, which relates to a hydraulic backlash compensating element for an internal combustion engine, which comprises a housing that has an opening and a pressure-actuated piston which is mounted in the opening of the housing that has a check valve which can allow oil to flow into the housing and has a valve seat and a valve element arranged movably within therein, the object is achieved by virtue of the fact that the valve element of the check valve is a hollow ball. The particular advantage here is that a hollow ball is lighter than a ball made of solid material. Owing to the lower mass, there is an improvement in the dynamic response of the valve element, leading to improvements in the response times of the check valve of the hydraulic backlash compensating element. Another advantage is that the force with which the valve element strikes against the valve seat decreases with the weight of the valve element. As a result, the wear on the valve seat and on the valve element is reduced.
- As a specific embodiment of the invention, it is proposed that the hollow ball be produced from a sintered inorganic material. In general, the valve elements used in hydraulic backlash compensating elements are solid steel balls having a diameter of 2-3 mm. To enable a robust hollow ball of such a size to be produced, a special manufacturing process is required. This process has been developed only recently by IFAM (Fraunhofer—Institut für Fertigungstechnik und Angewandte Materialforschung) and hollomet GmbH, see also WO 2001/54846 A2. Expanded polystyrene balls are used as the starting material. In a fluidized bed process, an air stream blows the balls upwards and keeps them suspended while a suspension of metal powder and binder is sprayed onto them from above. Once the metal layer is thick enough, a heat treatment is carried out: in a first step, all the organic constituents, the polystyrene and the binder vaporize. The residual materials are gaseous and escape through the pores in the metal layer. What remains is a fragile metal ball. This is sintered at just below the melting temperature. During this process, the metal powder granules combine and the shell becomes hard and impermeable. The ball is now sufficiently robust to be ground in a grinding machine. The wall thickness can be set to thicknesses of between a few tenths of a millimeter and one millimeter. A hollow ball produced in the manner described has a low inertia, on the one hand, and, given the appropriate wall thickness, also has the required robustness, on the other. A hollow ball produced by this process is therefore eminently suitable as a valve element in a check valve subjected to dynamic loading in a hydraulic backlash compensating element.
- According to a preferred development of the invention, it is proposed that the hollow ball have a filling. A partially filled hollow ball makes it possible to optimize the noise behavior of the valve since the noises associated with the impact of the valve element in the valve seat are attenuated. The rebounding of the valve element during closure onto the valve seat is likewise reduced. As a result, there is an improvement in the closing behavior and hence also in the response time of the valve. The filling can be composed of various materials. Gases, gels or colloids can be used as a filling, for example, depending on the application. Solids, sand, powder or even liquids are likewise conceivable, and the liquids in turn may differ in their viscosity.
- According to another embodiment of the invention, it is envisaged that the wall of the hollow ball be composed of layers of different materials and/or that the wall be composed of a porous material. With surface layers of different hardness, it is possible to reduce both the wear on the valve element and the wear on the valve seat. A wall of porous material, on the other hand, can optimize the rebound behavior. Another variant envisages combining a layer of porous material with a hardened layer. It is likewise conceivable to use a harder substrate material, which is provided with a rubber coating in order to protect the valve seat and the valve element from wear.
- Illustrative embodiments of the invention are depicted in the figures, which are described in detail below, although the invention is not restricted to these illustrative embodiments. In the drawing:
-
FIG. 1 shows a hydraulic backlash compensating element embodied as a hydraulic belt tensioner, -
FIG. 2 shows a hydraulic backlash compensating element embodied as a hydraulic chain tensioner, -
FIG. 3 shows a hydraulic backlash compensating element embodied as a support element, -
FIG. 4 shows a check valve in cross section, -
FIG. 5 shows a valve element as a hollow ball, -
FIG. 6 shows a hollow ball with filling material, and -
FIG. 7 shows a hollow ball, the wall of which is composed of layers of different materials. - Various embodiments of hydraulic backlash compensating elements are depicted in
FIGS. 1 to 3 . Since the construction of all three embodiments is virtually identical, the description of the figures will be given by way of example forFIG. 2 , which shows a hydraulicbacklash compensating element 1 designed as a hydraulic chain tensioner. Inside ahousing 2 there is apiston 3 with anintegrated check valve 4. Thepiston 3 is arranged within thehousing 2 in a manner which allows longitudinal movement, and the two elements are pushed apart by aninternal spring 6. A definedleakage gap 10 is formed between the outer surface of thepiston 3 and the inner surface of thehousing 2. While thepiston 3 enters thehousing 2 under the action of an external force, e.g. that of a traction means or a cam (not shown here), a high pressure arises in apressure chamber 12 enclosed by the housing and the piston when thecheck valve 4 is closed. A small quantity of oil passes into the engine compartment through the verynarrow leakage gap 10. When the external force acting on thepiston 3 weakens, theinternal spring 6 pushes thebacklash compensating element 1 apart. This gives rise to a differential pressure which opens thecheck valve 4. The extra quantity of oil required for the compensating process can flow in via anoil feed opening 13 arranged in thehousing 2. - The
check valve 4 has avalve element 7 which interacts with avalve seat 5. In general, avalve spring 11 is provided in thecheck valve 4. This pushes thevalve element 7 in the direction of thevalve seat 5 and thus closes theoil feed opening 13 as the differential pressure falls. In order to obtain effective damping in the hydraulicbacklash compensating element 1, it is important that thecheck valve 4 should open and close precisely. The opening and closing times and the speed of response of thecheck valve 4 depend on the mass of thevalve element 4. The lighter thevalve element 7, the more rapid is the response of thecheck valve 4. For this reason, thevalve element 7 is embodied as a hollow ball in order to reduce the mass. -
FIG. 4 shows a detail view of thecheck valve 4 in the closed state when thevalve spring 11 is pressing thevalve element 7 into thevalve seat 5.FIG. 5 shows thevalve element 7 as a hollow ball in cross section. Thewall thickness 9 of the hollow ball can vary, depending on requirements.FIGS. 6 and 7 show further possible embodiments of thevalve element 7 for achieving optimum closing and opening behavior of thecheck valve 4 of the hydraulicbacklash compensating element 1.FIG. 6 shows avalve element 7 as a filled hollow ball. The filling 8 makes it possible to optimize the noise behavior of thecheck valve 4 since the noises associated with the impact of thevalve element 7 in thevalve seat 5 are attenuated. The rebounding of thevalve element 7 during closure onto thevalve scat 5 is likewise reduced. As a result, there is an improvement in the closing behavior and hence also in the response time of thecheck valve 4.FIG. 7 shows avalve element 7 embodied as a hollow ball, thewall 9 of which is composed of layers of different materials. With surface layers of different hardness, it is possible to reduce both the wear on thevalve element 7 and the wear on thevalve seat 5. -
- 1 Hydraulic Backlash Compensating Element
- 2 Housing
- 3 Piston
- 4 Check Valve
- 5 Valve Seat
- 6 Spring
- 7 Valve Element
- 8 Filling
- 9 Wall
- 10 Leakage Gap
- 11 Valve Spring
- 12 Pressure Chamber
- 13 Oil Feed Opening
Claims (11)
1-8. (canceled)
9. A hydraulic backlash compensating element for an internal combustion engine, comprising:
an elongated housing having a bore therein;
a pressure-actuated piston, which is mounted in the bore of the housing; and
a check valve mounted at one end of the housing to allow oil to flow into the housing, the check valve having a valve seat and a hollow ball arranged movably within the check valve.
10. The hydraulic backlash compensating element according to claim 9 , wherein the hollow ball is produced from a sintered inorganic material.
11. The hydraulic backlash compensating element according to claim 9 , wherein the hollow ball has a filling.
12. The hydraulic backlash compensating element according to claim 11 , wherein the filling comprising a gas, gel or colloid.
13. The hydraulic backlash compensating element according to claim 11 , wherein the filling is composed of solids.
14. The hydraulic backlash compensating element according to claim 13 , wherein the solids are sand or powder.
15. The hydraulic backlash compensating element according to claim 11 , wherein the filling comprises at least one liquid.
16. The hydraulic backlash compensating element according to claim 9 , wherein the hollow ball has a wall comprised of a porous material.
17. The hydraulic backlash compensating element according to claim 9 , wherein the hollow ball has a wall comprised of layers of different materials.
18. A check valve for hydraulic backlash compensating element for an internal combustion engine which has an elongated housing with a bore therein and a pressure-actuated piston mounted in the bore of the housing, comprising:
a housing;
a valve seat; and
a hollow ball, the valve seat and the hollow ball being arranged movably within the housing.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102010033091.4 | 2010-08-02 | ||
DE102010033091A DE102010033091A1 (en) | 2010-08-02 | 2010-08-02 | Hydraulic tension compensation element |
Publications (1)
Publication Number | Publication Date |
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US20120024249A1 true US20120024249A1 (en) | 2012-02-02 |
Family
ID=45470997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/196,017 Abandoned US20120024249A1 (en) | 2010-08-02 | 2011-08-02 | Hydraulic backlash compensating element |
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US (1) | US20120024249A1 (en) |
DE (1) | DE102010033091A1 (en) |
Cited By (24)
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WO2014037130A1 (en) * | 2012-09-07 | 2014-03-13 | Schaeffler Technologies AG & Co. KG | Valve train for an internal combustion engine |
WO2015054372A3 (en) * | 2013-10-08 | 2015-06-04 | Dayco Ip Holdings, Llc | Noise attenuation in check valve unit |
US9382826B1 (en) | 2015-01-09 | 2016-07-05 | Dayco Ip Holdings, Llc | Noise attenuating member for noise attenuating units in engines |
US10024458B2 (en) | 2014-04-04 | 2018-07-17 | Dayco Ip Holdings, Llc | Bypass check valve and venturi devices having the same |
US10024339B2 (en) | 2014-05-30 | 2018-07-17 | Dayco Ip Holdings, Llc | Vacuum creation system having an ejector, pneumatic control valve and optionally an aspirator |
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US10107240B2 (en) | 2014-04-04 | 2018-10-23 | Dayco Ip Holdings, Llc | Check valves and Venturi devices having the same |
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US10190455B2 (en) | 2015-10-28 | 2019-01-29 | Dayco Ip Holdings, Llc | Venturi devices resistant to ice formation for producing vacuum from crankcase gases |
US10273978B2 (en) | 2014-08-27 | 2019-04-30 | Dayco IP, Holdings LLC | Low-cost evacuator for an engine having tuned Venturi gaps |
US10316864B2 (en) | 2015-04-13 | 2019-06-11 | Dayco Ip Holdings, Llc | Devices for producing vacuum using the venturi effect |
US10422351B2 (en) | 2015-07-17 | 2019-09-24 | Dayco Ip Holdings, Llc | Devices for producing vacuum using the venturi effect having a plurality of subpassageways and motive exits in the motive section |
US10443691B2 (en) * | 2015-01-16 | 2019-10-15 | Schaeffler Technologies AG & Co. KG | Tensioning device for a chain drive |
US10519984B2 (en) | 2014-06-06 | 2019-12-31 | Dayco Ip Holdings, Llc | Noise attenuation in a Venturi device and/or check valves |
US10626888B2 (en) | 2014-07-10 | 2020-04-21 | Dayco Ip Holdings, Llc | Dual Venturi device |
US10697525B2 (en) * | 2015-10-26 | 2020-06-30 | Ntn Corporation | Hydraulic auto-tensioner |
US10865810B2 (en) | 2018-11-09 | 2020-12-15 | Flowserve Management Company | Fluid exchange devices and related systems, and methods |
US10920555B2 (en) | 2018-11-09 | 2021-02-16 | Flowserve Management Company | Fluid exchange devices and related controls, systems, and methods |
US10988999B2 (en) | 2018-11-09 | 2021-04-27 | Flowserve Management Company | Fluid exchange devices and related controls, systems, and methods |
US11193564B2 (en) * | 2017-02-14 | 2021-12-07 | Hutchinson | Belt tensioner |
US11193608B2 (en) | 2018-11-09 | 2021-12-07 | Flowserve Management Company | Valves including one or more flushing features and related assemblies, systems, and methods |
US11274681B2 (en) | 2019-12-12 | 2022-03-15 | Flowserve Management Company | Fluid exchange devices and related controls, systems, and methods |
US11286958B2 (en) | 2018-11-09 | 2022-03-29 | Flowserve Management Company | Pistons for use in fluid exchange devices and related devices, systems, and methods |
US11592036B2 (en) | 2018-11-09 | 2023-02-28 | Flowserve Management Company | Fluid exchange devices and related controls, systems, and methods |
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