US20110012045A1 - Valve cap for a non-return valve - Google Patents
Valve cap for a non-return valve Download PDFInfo
- Publication number
- US20110012045A1 US20110012045A1 US12/919,835 US91983508A US2011012045A1 US 20110012045 A1 US20110012045 A1 US 20110012045A1 US 91983508 A US91983508 A US 91983508A US 2011012045 A1 US2011012045 A1 US 2011012045A1
- Authority
- US
- United States
- Prior art keywords
- valve
- return valve
- section
- flow cross
- valve body
- 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
Links
Images
Classifications
-
- 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
- F16H7/0829—Means for varying tension of belts, ropes, or chains with vibration damping means
- F16H7/0836—Means for varying tension of belts, ropes, or chains with vibration damping means of the fluid and restriction type, e.g. dashpot
-
- 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
- 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 non-return valve for a hydraulic tensioning system of traction mechanism drives of an internal combustion engine.
- the non-return valve In the operating state, the non-return valve enables a throughflow of hydraulic fluid from a hydraulic fluid reservoir into a high-pressure chamber in an expansion phase of the tensioning system.
- the non-return valve In the compression phase, the non-return valve has the task of limiting or preventing the hydraulic fluid flow.
- the structure of the non-return valve comprises a housing which is also referred to as a valve cap or holding means, in which housing in particular a valve body designed as a ball is inserted, which valve body is connected under spring loading to a throughflow cross section.
- DE 40 35 823 C1 discloses a hydraulic tensioning system for traction mechanism drives, in particular chain drives of an internal combustion engine.
- a tensioning piston which is pressed against the traction mechanism is held in a longitudinally movable manner in a cylinder.
- the tensioning piston and the cylinder delimit a pressure chamber for holding a hydraulic fluid.
- a movement of the tensioning piston in the direction of the traction mechanism which may also be referred to as an expansion phase, brings about an enlargement of the pressure chamber, wherein as a result of a vacuum which is generated, a non-return valve opens, wherein hydraulic fluid can flow into the pressure chamber.
- the tensioning piston In the compression phase, in the event of tensioning of the traction mechanism, the tensioning piston is loaded in the opposite direction, that is to say inwards, with the pressure in the pressure chamber increasing, as a result of which the tensioning piston moves inwards, synchronously to an activated partial amount of hydraulic fluid via a leakage gap generated between the tensioning piston and the housing. Consequently, in the compression phase, the non-return valve prevents a return flow of the hydraulic fluid from the pressure chamber into the storage chamber. Said known design leads to hydraulic adhesion of the valve body, which is designed as a ball, to the valve seat of the non-return valve.
- valve body which is designed as a ball
- valve seat which is formed centrally as a bore, in the housing or the valve cap.
- the known non-return valves consistently have a design in which the valve body, effective closing at the start of the compression phase is hindered by a relatively narrow gap generated between the valve body, which is designed as a ball, and the housing or the valve cap, and by flow manipulation generated behind the valve body by the valve spring.
- valve cap In the case of a design of the non-return valve in which the valve cap has a central flow cross section, said valve cap is closed off at the complete flow cross section of the valve by the valve body, the ball, with a space being formed between the valve spring, the valve cap and the ball, which space likewise causes hydraulic adhesion, since the hydraulic fluid cannot flow in unhindered, and is hindered on account of the sealing by the valve body and also by the valve body spring.
- the invention is based on the object of providing a functionally improved non-return valve with a reduced flow resistance in order to obtain an optimum inflow of the hydraulic fluid.
- a design of the hydraulic valve in which, when the non-return valve is open, the valve body interacts with a valve seat of the housing, the associated flow cross section of which ensures a fluid flow through the non-return valve.
- the housing or the valve cap is designed such that a valve seat, which is assigned to the base of the housing, intentionally does not bring about a complete closure.
- the non-return valve according to the invention which is used in hydraulic tensioning systems ensures, in the open position, a fast and delay-free flow of the hydraulic fluid from the reservoir into the pressure chamber. Improved suction of the hydraulic fluid is thereby generated in the expansion phase, which leads to optimum switching behavior of the hydraulic valve.
- the design of the hydraulic valve according to the invention prevents a throughflow of hydraulic fluid in the compression phase. Furthermore, the measure according to the invention prevents a disadvantageous hydraulic adhesion of the valve body to the valve seat of the housing, which leads to improved hysteresis behavior during a reversal from the expansion phase into the compression phase.
- the valve seat on the base of the housing which is also referred to as a valve cap, is formed by a flow cross section which does not enter into positively locking engagement with the valve body. In this way, even in the event of abutment of the valve body against the valve seat, a substantially unhindered flow of the hydraulic fluid into the pressure chamber can take place.
- the flow cross sections in the base of the valve cap or of the housing may be of any desired geometrical shape, wherein regardless of their design, complete positively locking engagement is never generated between the valve body and the valve seat which forms a flow cross section.
- One preferred refinement provides a non-circular flow cross section which interacts with the valve body.
- a plurality of flow cross sections to be arranged in the flat base of the housing or of the valve cap.
- Said flow cross sections are positioned such that, in an end position of the valve body against the valve seat of the base, said valve body covers the throughflow cross sections of the flow cross sections partially or in regions, such that a virtually unhindered inflow of hydraulic fluid is possible.
- valve body is supported, in an end position, on a central web between the bores, as a result of which the hydraulic fluid flow in the expansion phase is virtually uninfluenced.
- the flow cross section be formed in a convexly shaped portion of the base, with the radius of curvature of the base differing from the radius of the valve body, which is designed as a ball.
- the radius of curvature of the base is advantageously greater than that of the valve body.
- suitable for this purpose is an inverse configuration, with the smaller radius of curvature of the base in relation to that of the valve body being restricted locally to a flow cross sectional region which is adjoined by a radius of curvature which is greater than that of the valve body.
- the radius of curvature of the base which is smaller than that of the valve body, to be provided in a stepped portion, wherein at the same time the flow cross sections are not circular but rather are, for example, oval.
- the non-return valve according to the invention also includes an embodiment in which the base is designed such that a contact surface assigned to the valve body form different curvatures with two mutually perpendicular section planes which comprise in each case one movement axis of the valve body.
- FIG. 1 shows a longitudinal section of the design of a hydraulic tensioning system
- FIGS. 2 a to 6 c show individual part drawings of non-return valves according to the invention with differently designed flow cross sections in the base;
- FIG. 2 a shows a first exemplary embodiment of a non-return valve according to the invention
- FIG. 2 b shows a plan view of the non-return valve according to FIG. 2 a , in which the base encompasses an oval flow cross section;
- FIG. 3 a shows a second exemplary embodiment of a non-return valve according to the invention
- FIG. 3 b shows the plan view of the non-return valve according to FIG. 3 a , with a square recess as a flow cross section;
- FIG. 4 a shows a third exemplary embodiment of a non-return valve according to the invention
- FIG. 4 b shows the plan view of the non-return valve according to FIG. 4 a , with a polygonal flow cross section;
- FIG. 5 a shows a fourth exemplary embodiment of a non-return valve according to the invention
- FIG. 5 b shows the plan view of the non-return valve according to FIG. 5 a , in which the valve cap encompasses three bores arranged close together as a flow cross section;
- FIG. 6 a shows a fifth exemplary embodiment of a non-return valve according to the invention
- FIG. 6 b shows the plan view of the non-return valve according to FIG. 6 a ;
- FIG. 6 c shows the side view of the non-return valve according to FIG. 6 b.
- FIG. 1 shows a sectional illustration of a hydraulic tensioning system 1 which is assigned to a traction mechanism drive and which interacts with a traction mechanism of a traction mechanism drive indirectly via a tensioning roller not shown in FIG. 1 .
- the assembly comprises a housing 2 which is articulatedly connected in a positionally fixed and pivotable manner via a fastening lug 3 a for example to a housing of the internal combustion engine.
- the housing 2 forms a pot-shaped component in which a cylinder 4 is inserted centrally, which cylinder 4 is designed to receive a linearly movable piston 5 .
- the cylinder 4 in conjunction with the piston 5 delimit a hydraulic-fluid-filled pressure chamber 6 which is connected via a duct 8 of the housing 2 and a throughflow cross section 12 of the cylinder 4 to a reservoir 9 for the hydraulic fluid.
- the reservoir 9 is delimited at the outside by the housing 2 and at the inside by the lateral surface of the cylinder 4 .
- a pressure spring 10 which is also integrated in the cylinder 4 is supported with one spring end against a base of the housing 2 and with the other spring end against a disk 11 which is positionally fixed to the piston 5 .
- the pressure spring 10 loads the piston 5 in the direction of a force direction “R” and brings about an actuating movement of the piston 5 and consequently the exertion of a force on a tensioning roller which is connected to the fastening lug 3 b.
- Said piston movement which is also referred to as an expansion movement, results in a vacuum in the pressure chamber 6 , as a result of which hydraulic fluid flows into the pressure chamber 6 via the non-return valve 7 from the reservoir 9 through the duct 8 of the housing 2 and the throughflow cross section 12 of the cylinder 4 .
- the non-return valve 7 closes by virtue of a valve body 13 being supported sealingly on the valve seat 14 .
- the piston 5 which passes into the pressure chamber 6 displaces a partial amount of the hydraulic fluid out of the pressure chamber 6 into the reservoir 9 via a leakage gap 15 generated between the piston 5 and the cylinder 4 .
- FIGS. 2 a - 6 c show variants of non-return valves designed according to the invention, which differ in particular by having differently designed flow cross sections in the base of the housing of the non-return valve.
- FIGS. 2 a and 2 b show different views of the non-return valve 16 , in which the pot-shaped housing 17 , which is also referred to as the valve cap, encompasses in the base 18 an oval flow cross section 19 which forms the valve seat 21 .
- the valve body 20 which is designed as a ball, in the end position. It is thereby possible in the expansion phase for a partial quantity of the hydraulic fluid to flow through the non-return valve 16 .
- the base 18 of the non-return valve 16 has a square-shaped flow cross section 22 , which likewise forms a valve seat 23 which is not fully closed by the valve body 20 bearing against it.
- FIGS. 4 a , 4 b show a polygonal flow cross section 24 in the base 18 of the housing 17 , which likewise does not permit complete positively locking engagement with the valve body 20 .
- FIGS. 5 a , 5 b A further variant is shown in FIGS. 5 a , 5 b , in which the non-return valve 16 encompasses, as a flow cross-section 26 , three identically dimensioned bores which are formed in the base 18 in an equilateral triangle and which, together form a valve seat 27 which can be closed off by the valve body 20 only to a limited extent.
- the non-return valve 16 encompasses a housing 17 with a base 18 which is designed such that a contact surface 31 assigned to the valve body 20 comprises two mutually perpendicular section planes 32 a, 32 b which in each case form a movement axis of the valve body 20 with different curvatures to one another.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
A non-return valve for a hydraulic tensioning system which is used in traction mechanism drives of internal combustion engines and which manipulates a hydraulic fluid flow between a pressure chamber and a reservoir. The non-return valve has a valve body which is inserted in a housing and which is embodied as a ball and which, when the non-return valve is closed, is supported in a spring-loaded fashion against a valve seat of a through-flow cross-section. When the non-return valve is open, the valve body is assigned to a valve seat of the housing and the flow cross-section (19) of the valve seat ensures a fluid flow through the non-return valve.
Description
- The present invention relates to a non-return valve for a hydraulic tensioning system of traction mechanism drives of an internal combustion engine. In the operating state, the non-return valve enables a throughflow of hydraulic fluid from a hydraulic fluid reservoir into a high-pressure chamber in an expansion phase of the tensioning system. In the compression phase, the non-return valve has the task of limiting or preventing the hydraulic fluid flow. The structure of the non-return valve comprises a housing which is also referred to as a valve cap or holding means, in which housing in particular a valve body designed as a ball is inserted, which valve body is connected under spring loading to a throughflow cross section.
- DE 40 35 823 C1 discloses a hydraulic tensioning system for traction mechanism drives, in particular chain drives of an internal combustion engine. A tensioning piston which is pressed against the traction mechanism is held in a longitudinally movable manner in a cylinder. The tensioning piston and the cylinder delimit a pressure chamber for holding a hydraulic fluid. A movement of the tensioning piston in the direction of the traction mechanism, which may also be referred to as an expansion phase, brings about an enlargement of the pressure chamber, wherein as a result of a vacuum which is generated, a non-return valve opens, wherein hydraulic fluid can flow into the pressure chamber. In the compression phase, in the event of tensioning of the traction mechanism, the tensioning piston is loaded in the opposite direction, that is to say inwards, with the pressure in the pressure chamber increasing, as a result of which the tensioning piston moves inwards, synchronously to an activated partial amount of hydraulic fluid via a leakage gap generated between the tensioning piston and the housing. Consequently, in the compression phase, the non-return valve prevents a return flow of the hydraulic fluid from the pressure chamber into the storage chamber. Said known design leads to hydraulic adhesion of the valve body, which is designed as a ball, to the valve seat of the non-return valve.
- Furthermore, a non-return valve design is known in which the valve body, which is designed as a ball, interacts with a valve seat, which is formed centrally as a bore, in the housing or the valve cap. The known non-return valves consistently have a design in which the valve body, effective closing at the start of the compression phase is hindered by a relatively narrow gap generated between the valve body, which is designed as a ball, and the housing or the valve cap, and by flow manipulation generated behind the valve body by the valve spring.
- In the case of a design of the non-return valve in which the valve cap has a central flow cross section, said valve cap is closed off at the complete flow cross section of the valve by the valve body, the ball, with a space being formed between the valve spring, the valve cap and the ball, which space likewise causes hydraulic adhesion, since the hydraulic fluid cannot flow in unhindered, and is hindered on account of the sealing by the valve body and also by the valve body spring.
- The invention is based on the object of providing a functionally improved non-return valve with a reduced flow resistance in order to obtain an optimum inflow of the hydraulic fluid.
- According to the invention, to solve said problem, a design of the hydraulic valve is provided in which, when the non-return valve is open, the valve body interacts with a valve seat of the housing, the associated flow cross section of which ensures a fluid flow through the non-return valve. According to the invention, the housing or the valve cap is designed such that a valve seat, which is assigned to the base of the housing, intentionally does not bring about a complete closure. The non-return valve according to the invention which is used in hydraulic tensioning systems ensures, in the open position, a fast and delay-free flow of the hydraulic fluid from the reservoir into the pressure chamber. Improved suction of the hydraulic fluid is thereby generated in the expansion phase, which leads to optimum switching behavior of the hydraulic valve. On the other hand, the design of the hydraulic valve according to the invention prevents a throughflow of hydraulic fluid in the compression phase. Furthermore, the measure according to the invention prevents a disadvantageous hydraulic adhesion of the valve body to the valve seat of the housing, which leads to improved hysteresis behavior during a reversal from the expansion phase into the compression phase.
- Dependent claims 2-9 relate to further advantageous embodiments of the invention.
- According to the invention, the valve seat on the base of the housing, which is also referred to as a valve cap, is formed by a flow cross section which does not enter into positively locking engagement with the valve body. In this way, even in the event of abutment of the valve body against the valve seat, a substantially unhindered flow of the hydraulic fluid into the pressure chamber can take place.
- The flow cross sections in the base of the valve cap or of the housing may be of any desired geometrical shape, wherein regardless of their design, complete positively locking engagement is never generated between the valve body and the valve seat which forms a flow cross section. One preferred refinement provides a non-circular flow cross section which interacts with the valve body. Alternatively, according to the invention, it is expedient to insert into the base of the valve cap an oval, multi-cornered, for example triangular or tetragonal flow cross section, or a polygonal flow cross section with rounded corners.
- According to the invention, it is also expedient for a plurality of flow cross sections to be arranged in the flat base of the housing or of the valve cap. Said flow cross sections are positioned such that, in an end position of the valve body against the valve seat of the base, said valve body covers the throughflow cross sections of the flow cross sections partially or in regions, such that a virtually unhindered inflow of hydraulic fluid is possible.
- As a preferred example of an arrangement of a plurality of flow cross sections, three circular bores arranged close together should be provided, the outer contour of which bores forms an equilateral triangle. In the case of a central arrangement of said three bores, the valve body is supported, in an end position, on a central web between the bores, as a result of which the hydraulic fluid flow in the expansion phase is virtually uninfluenced.
- It is provided in a further embodiment according to the invention that the flow cross section be formed in a convexly shaped portion of the base, with the radius of curvature of the base differing from the radius of the valve body, which is designed as a ball. For this purpose, the radius of curvature of the base is advantageously greater than that of the valve body. Alternatively suitable for this purpose is an inverse configuration, with the smaller radius of curvature of the base in relation to that of the valve body being restricted locally to a flow cross sectional region which is adjoined by a radius of curvature which is greater than that of the valve body. As a measure for preventing disadvantageous hydraulic adhesion, it is also expedient for the radius of curvature of the base, which is smaller than that of the valve body, to be provided in a stepped portion, wherein at the same time the flow cross sections are not circular but rather are, for example, oval.
- The non-return valve according to the invention also includes an embodiment in which the base is designed such that a contact surface assigned to the valve body form different curvatures with two mutually perpendicular section planes which comprise in each case one movement axis of the valve body.
- Exemplary embodiments of the invention are illustrated in the drawings which are described below, wherein the invention is not restricted to said exemplary embodiments. In the drawings:
-
FIG. 1 shows a longitudinal section of the design of a hydraulic tensioning system; -
FIGS. 2 a to 6 c show individual part drawings of non-return valves according to the invention with differently designed flow cross sections in the base; -
FIG. 2 a shows a first exemplary embodiment of a non-return valve according to the invention; -
FIG. 2 b shows a plan view of the non-return valve according toFIG. 2 a, in which the base encompasses an oval flow cross section; -
FIG. 3 a shows a second exemplary embodiment of a non-return valve according to the invention; -
FIG. 3 b shows the plan view of the non-return valve according toFIG. 3 a, with a square recess as a flow cross section; -
FIG. 4 a shows a third exemplary embodiment of a non-return valve according to the invention; -
FIG. 4 b shows the plan view of the non-return valve according toFIG. 4 a, with a polygonal flow cross section; -
FIG. 5 a shows a fourth exemplary embodiment of a non-return valve according to the invention; -
FIG. 5 b shows the plan view of the non-return valve according toFIG. 5 a, in which the valve cap encompasses three bores arranged close together as a flow cross section; -
FIG. 6 a shows a fifth exemplary embodiment of a non-return valve according to the invention; -
FIG. 6 b shows the plan view of the non-return valve according toFIG. 6 a; and -
FIG. 6 c shows the side view of the non-return valve according toFIG. 6 b. -
FIG. 1 shows a sectional illustration of ahydraulic tensioning system 1 which is assigned to a traction mechanism drive and which interacts with a traction mechanism of a traction mechanism drive indirectly via a tensioning roller not shown inFIG. 1 . The assembly comprises ahousing 2 which is articulatedly connected in a positionally fixed and pivotable manner via a fastening lug 3 a for example to a housing of the internal combustion engine. Thehousing 2 forms a pot-shaped component in which acylinder 4 is inserted centrally, whichcylinder 4 is designed to receive a linearlymovable piston 5. Thecylinder 4 in conjunction with thepiston 5 delimit a hydraulic-fluid-filledpressure chamber 6 which is connected via aduct 8 of thehousing 2 and athroughflow cross section 12 of thecylinder 4 to areservoir 9 for the hydraulic fluid. Here, thereservoir 9 is delimited at the outside by thehousing 2 and at the inside by the lateral surface of thecylinder 4. Apressure spring 10 which is also integrated in thecylinder 4 is supported with one spring end against a base of thehousing 2 and with the other spring end against adisk 11 which is positionally fixed to thepiston 5. Thepressure spring 10 loads thepiston 5 in the direction of a force direction “R” and brings about an actuating movement of thepiston 5 and consequently the exertion of a force on a tensioning roller which is connected to the fasteninglug 3 b. Said piston movement, which is also referred to as an expansion movement, results in a vacuum in thepressure chamber 6, as a result of which hydraulic fluid flows into thepressure chamber 6 via thenon-return valve 7 from thereservoir 9 through theduct 8 of thehousing 2 and thethroughflow cross section 12 of thecylinder 4. In the compression phase, during an inverse actuating movement of thepiston 5 in the force direction “F”, thenon-return valve 7 closes by virtue of a valve body 13 being supported sealingly on the valve seat 14. Here, thepiston 5 which passes into thepressure chamber 6 displaces a partial amount of the hydraulic fluid out of thepressure chamber 6 into thereservoir 9 via a leakage gap 15 generated between thepiston 5 and thecylinder 4. -
FIGS. 2 a-6 c show variants of non-return valves designed according to the invention, which differ in particular by having differently designed flow cross sections in the base of the housing of the non-return valve. -
FIGS. 2 a and 2 b show different views of thenon-return valve 16, in which the pot-shapedhousing 17, which is also referred to as the valve cap, encompasses in the base 18 an ovalflow cross section 19 which forms the valve seat 21. On account of the oval shape of theflow cross section 19, the latter is not fully closed by thevalve body 20, which is designed as a ball, in the end position. It is thereby possible in the expansion phase for a partial quantity of the hydraulic fluid to flow through thenon-return valve 16. - According to
FIGS. 3 a, 3 b, thebase 18 of thenon-return valve 16 has a square-shapedflow cross section 22, which likewise forms avalve seat 23 which is not fully closed by thevalve body 20 bearing against it. -
FIGS. 4 a, 4 b show a polygonalflow cross section 24 in thebase 18 of thehousing 17, which likewise does not permit complete positively locking engagement with thevalve body 20. - A further variant is shown in
FIGS. 5 a, 5 b, in which thenon-return valve 16 encompasses, as aflow cross-section 26, three identically dimensioned bores which are formed in the base 18 in an equilateral triangle and which, together form avalve seat 27 which can be closed off by thevalve body 20 only to a limited extent. - According to
FIGS. 6 a-6 c, thenon-return valve 16 encompasses ahousing 17 with a base 18 which is designed such that acontact surface 31 assigned to thevalve body 20 comprises two mutually perpendicular section planes 32 a, 32 b which in each case form a movement axis of thevalve body 20 with different curvatures to one another. -
-
- 1 Tensioning system
- 2 Housing
- 3 a Fastening lug
- 3 b Fastening lug
- 4 Cylinder
- 5 Piston
- 6 Pressure chamber
- 7 Non-return valve
- 8 Duct
- 9 Reservoir
- 10 Pressure spring
- 11 Disk
- 12 Throughflow cross section
- 13 Valve body
- 14 Valve seat
- 15 Leakage gap
- 16 Non-return valve
- 17 Housing
- 18 Base
- 19 Flow cross section
- 20 Valve body
- 21 Valve seat
- 22 Flow cross section
- 23 Valve seat
- 24 Flow cross section
- 25 Valve seat
- 26 Flow cross section
- 27 Valve seat
- 28 Flow cross section
- 29 Valve seat
- 30 Gap dimension
- 31 Contact surface
- 32 a Section plane
- 32 b Section plane
Claims (9)
1. A non-return valve of a hydraulic tensioning system of traction mechanism drives of internal combustion engines, inserted between a hydraulic-fluid-filled pressure chamber and a reservoir, comprising:
a valve body which is inserted in a housing and which is designed as a ball and which, when the non-return valve is closed, is supported under spring loading against a valve seat of a throughflow cross-section,
wherein, when the non-return valve is open, the valve body interacts with a valve seat of the housing, the associated flow cross-section of which ensures a fluid flow through the non-return valve.
2. The non-return valve as claimed in claim 1 , wherein the valve seat, which is positioned in a base of the housing, prevents the valve body from being held in a positively locking manner.
3. The non-return valve as claimed in claim 1 , wherein the flow cross-sections in a base of the housing are of any desired geometrical design.
4. The non-return valve as claimed in claim 3 , wherein the flow cross-sections are of non-circular shape.
5. The non-return valve as claimed in claim 3 , wherein the base of the housing has at least an oval, multi-cornered or polygonal flow cross-section.
6. The non-return valve as claimed in claim 1 , wherein a plurality of bores is provided as a flow cross-section, with the valve body influencing a fluid flow in all the bores.
7. The non-return valve as claimed in claim 6 , wherein the flow cross-section comprises three bores arranged close together.
8. The non-return valve as claimed in claim 2 , wherein the flow cross-section is formed in a convexly shaped portion of the base, with a radius of curvature of the base differing from a radius of the valve body.
9. The non-return valve as claimed in claim 2 , wherein the base is designed such that a contact surface assigned to the valve body form different curvatures with two mutually perpendicular section planes which each comprise one movement axis of the valve body.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008011787.0 | 2008-02-28 | ||
DE102008011787A DE102008011787A1 (en) | 2008-02-28 | 2008-02-28 | Valve cap for a check valve |
PCT/EP2008/067132 WO2009106179A1 (en) | 2008-02-28 | 2008-12-09 | Valve cap for a non-return valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110012045A1 true US20110012045A1 (en) | 2011-01-20 |
Family
ID=40329302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/919,835 Abandoned US20110012045A1 (en) | 2008-02-28 | 2008-12-09 | Valve cap for a non-return valve |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110012045A1 (en) |
EP (1) | EP2250399B1 (en) |
CN (1) | CN102138027B (en) |
DE (1) | DE102008011787A1 (en) |
WO (1) | WO2009106179A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180289607A1 (en) * | 2015-11-27 | 2018-10-11 | Amorepacific Corporation | Emulsion cosmetic composition containing ceramide and method for preparing same |
US10697525B2 (en) * | 2015-10-26 | 2020-06-30 | Ntn Corporation | Hydraulic auto-tensioner |
US11193564B2 (en) * | 2017-02-14 | 2021-12-07 | Hutchinson | Belt tensioner |
US11305075B2 (en) | 2015-04-09 | 2022-04-19 | Aft Pharmaceuticals Limited | Nasal medication delivery device |
US20230258246A1 (en) * | 2020-06-09 | 2023-08-17 | Ashlyn ANTONY | An apparatus for eliminating slack and vibrations in the chain of a chain drive |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011116934A1 (en) * | 2011-10-26 | 2013-05-02 | Man Truck & Bus Ag | Arrangement of a valve cover on the cylinder head of an internal combustion engine |
CN106855145A (en) * | 2015-12-09 | 2017-06-16 | 北京谊安医疗系统股份有限公司 | A kind of valve casing for safe valve exhaust |
DE102017103534A1 (en) * | 2017-02-21 | 2018-08-23 | Iwis Motorsysteme Gmbh & Co. Kg | Valve unit with carrier plate and valve body |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1092782A (en) * | 1913-08-08 | 1914-04-07 | Stephen S Miles | Gas-compressor valve mechanism. |
US3285270A (en) * | 1963-12-11 | 1966-11-15 | Gorton Heating Corp | Adaptor for heating system air valves |
US20040163715A1 (en) * | 2001-08-31 | 2004-08-26 | Marc Hohmann | Non-return valve for a pump |
US7775923B2 (en) * | 2004-07-01 | 2010-08-17 | Ntn Corporation | Chain tensioner for two-wheeled vehicle engine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4035823C1 (en) | 1990-11-10 | 1991-12-19 | Bayerische Motoren Werke Ag, 8000 Muenchen, De | Hydraulic tensioner for chain drives - has pressure restrictor valve in bottom of tension piston guide |
JP2003056657A (en) * | 2001-08-09 | 2003-02-26 | Otics Corp | Hydraulic automatic tensioner |
JP2003207001A (en) * | 2002-01-10 | 2003-07-25 | Otics Corp | Hydraulic automatic tensioner |
DE10222752A1 (en) * | 2002-05-23 | 2003-12-04 | Ina Schaeffler Kg | Hydraulic tensioning device |
JP3642527B1 (en) * | 2004-05-31 | 2005-04-27 | 株式会社椿本チエイン | Hydraulic tensioner |
JP2007218401A (en) * | 2006-02-20 | 2007-08-30 | Ntn Corp | Hydraulic type automatic tensioner |
-
2008
- 2008-02-28 DE DE102008011787A patent/DE102008011787A1/en not_active Withdrawn
- 2008-12-09 EP EP08872977.7A patent/EP2250399B1/en not_active Not-in-force
- 2008-12-09 WO PCT/EP2008/067132 patent/WO2009106179A1/en active Application Filing
- 2008-12-09 US US12/919,835 patent/US20110012045A1/en not_active Abandoned
- 2008-12-09 CN CN200880127697.1A patent/CN102138027B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1092782A (en) * | 1913-08-08 | 1914-04-07 | Stephen S Miles | Gas-compressor valve mechanism. |
US3285270A (en) * | 1963-12-11 | 1966-11-15 | Gorton Heating Corp | Adaptor for heating system air valves |
US20040163715A1 (en) * | 2001-08-31 | 2004-08-26 | Marc Hohmann | Non-return valve for a pump |
US7775923B2 (en) * | 2004-07-01 | 2010-08-17 | Ntn Corporation | Chain tensioner for two-wheeled vehicle engine |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11305075B2 (en) | 2015-04-09 | 2022-04-19 | Aft Pharmaceuticals Limited | Nasal medication delivery device |
US10697525B2 (en) * | 2015-10-26 | 2020-06-30 | Ntn Corporation | Hydraulic auto-tensioner |
US20180289607A1 (en) * | 2015-11-27 | 2018-10-11 | Amorepacific Corporation | Emulsion cosmetic composition containing ceramide and method for preparing same |
US11193564B2 (en) * | 2017-02-14 | 2021-12-07 | Hutchinson | Belt tensioner |
US20230258246A1 (en) * | 2020-06-09 | 2023-08-17 | Ashlyn ANTONY | An apparatus for eliminating slack and vibrations in the chain of a chain drive |
US11982352B2 (en) * | 2020-06-09 | 2024-05-14 | Ashlyn ANTONY | Apparatus for eliminating slack and vibrations in the chain of a chain drive |
Also Published As
Publication number | Publication date |
---|---|
WO2009106179A1 (en) | 2009-09-03 |
DE102008011787A1 (en) | 2009-09-03 |
EP2250399B1 (en) | 2013-07-17 |
EP2250399A1 (en) | 2010-11-17 |
CN102138027A (en) | 2011-07-27 |
CN102138027B (en) | 2015-01-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20110012045A1 (en) | Valve cap for a non-return valve | |
US8202065B2 (en) | High pressure fuel pump | |
US6116870A (en) | High pressure pump with solenoid operated valve | |
US8499740B2 (en) | Engine braking system for vehicles | |
US5941215A (en) | Fuel injection system for a multicylinder internal combustion engine | |
US20090145404A1 (en) | Injector of a fuel injection system of an internal combustion engine | |
FI114501B (en) | Power limit valve for fuel system | |
RU2008139317A (en) | FUEL INJECTOR VALVE FOR INTERNAL COMBUSTION ENGINE | |
US7219876B2 (en) | Electromagnetic valve apparatus | |
JP2018503025A (en) | Rocker arm assembly for engine brake | |
US6779496B2 (en) | Pressure reservoir for exerting pressure on a hydraulic system, with which preferably a gas exchange valve of an internal combustion engine is actuated | |
CN106065957B (en) | Switching valve and connecting rod with switching valve | |
WO2009092537A3 (en) | Check valve and piston pump having check valve | |
CN106030093B (en) | The valve of Electromagnetically-operating | |
CN103180601A (en) | Pressure regulating valve | |
WO2005085629A1 (en) | Seal structure of fuel passage and fuel injection valve having the seal structure | |
US10167834B2 (en) | High-pressure fuel pump including a discharge valve with a valve ball and a valve body | |
JP2004519610A (en) | Fuel injection device having pressure transmitting device and pressure transmitting device | |
KR20060122974A (en) | Seal structure of fuel passage and fuel injection valve having the seal structure | |
JP4335544B2 (en) | Valves for controlling connections in a high-pressure liquid system of a fuel injection device used in particular for internal combustion engines | |
CN110645385B (en) | Check valve for a connecting rod of an internal combustion engine with variable compression ratio and connecting rod with a check valve | |
US20130340861A1 (en) | Check valve of fuel system | |
JP2003511623A (en) | Injector for a fuel injection system used in an internal combustion engine having a nozzle needle protruding into a valve control chamber | |
US20040112313A1 (en) | Valve driving device for an engine | |
US20170276111A1 (en) | Valve Arrangement and a High Pressure Pump for a Fuel Injection System of an Internal Combustion Engine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHAEFER, CHRISTIAN;KRAFT, THOMAS;HARTMANN, BERND;SIGNING DATES FROM 20100816 TO 20100908;REEL/FRAME:025027/0764 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |