WO2008092594A1

WO2008092594A1 - Temperature control valve device

Info

Publication number: WO2008092594A1
Application number: PCT/EP2008/000509
Authority: WO
Inventors: Dirk Kamarys; Marcus Diederich
Original assignee: Ixetic Hückeswagen Gmbh
Priority date: 2007-01-31
Filing date: 2008-01-24
Publication date: 2008-08-07
Also published as: DE112008000183A5

Abstract

The invention relates to a temperature control valve device (30) for a pump (1), particularly for a lubricant pump of an internal combustion engine, comprising a valve housing, in which one end of a valve tappet is housed. At the other end thereof, a valve closing body (35) is provided, releasing or interrupting a connection between a high pressure channel (25) and a low pressure channel (29), depending on the expansion of a expanding element (31), which acts on the valve tappet and on which a return spring device supported in the valve housing acts. The invention is characterized in that the valve closing body comprises a through-hole.

Description

Temperaturschaltventileinrichtunq

The invention relates to a temperature switching valve device for a pump, in particular for a lubricant pump of an internal combustion engine, having a valve housing, in which one end of a valve stem is accommodated, at the other end a valve closing body is provided, the connection between a high pressure passage and a low pressure passage in dependence the expansion of a Dehnstoffelements releases or interrupts, which acts on the valve stem and is acted upon by a supported in the valve housing return spring means. The invention further relates to a pump, in particular a lubricant pump of an internal combustion engine with a temperature switching valve device described above.

The object of the invention is to provide a temperature switching valve device according to the preamble of claim 1, which is easy to assemble and inexpensive to produce. In particular, forces and pulsation should be reduced to the expansion element.

The object is with a temperature switching valve device for a pump, in particular for a lubricant pump of an internal combustion engine, with a valve housing, in which one end of a valve stem is accommodated, at the other end a valve closing body is provided, the connection between a high-pressure channel and a low-pressure channel in dependence releases or disengages from the expansion of an expansion element which acts on the valve stem and is acted on by a return spring device supported in the valve housing, in that the valve closure body has a through-hole. The closing element cooperates with a valve seat surface or valve sealing surface on which the closing element comes to rest when the expansion element expands due to temperature. The valve seat surface or valve sealing surface facing surface of the closing element is, in particular in the closed state of the temperature switching valve device, subjected to high pressure. Through the through hole, the high-pressure surface of the valve closing body is reduced. This provides the advantage that pressure pulsations occurring during operation of the temperature switching valve device, in particular during operation of a pump equipped with the temperature switching valve device, are not transmitted as strongly to the expansion element as with conventional temperature control devices. off valve devices. Therefore, the expansion element can be made smaller, without causing an overload.

A preferred embodiment of the temperature switching valve device is characterized in that the high-pressure channel via the through hole with an actuator chamber is in communication, in which the expansion element or an actuator is arranged, which cooperates via a piston with the expansion element. This allows pressure equalization in a simple manner. In particular, it is possible that only the actuator arranged in the actuator chamber or the piston is subjected to high pressure.

A further preferred embodiment of the temperature switching valve device is characterized in that the through hole extends through the valve closing body and the valve stem through into the actuator chamber. Preferably, the through hole has, at least partially, substantially the shape of a right circular cylinder extending from the high pressure passage through the valve closing body and the valve lifter into the actuator chamber.

A further preferred embodiment of the temperature switching valve device is characterized in that the valve stem is designed to be hollow inside. The cavity connects the high pressure passage with the actuator chamber.

Another preferred embodiment of the temperature switching valve device is characterized in that the valve stem is integrally connected to the valve closing body. This reduces the number of items needed and simplifies assembly.

A further preferred embodiment of the temperature switching valve device is characterized in that the valve stem and / or the valve closing body are formed from plastic / is. The valve tappet and / or the valve closing body are / is preferably designed as an injection molded part, in particular a finished one.

Another preferred embodiment of the temperature switching valve device is characterized in that between the valve stem and the valve housing a ring space is formed, in which a retaining ring is guided back and forth movable. Among other things, the retaining ring, which can be moved back and forth in the axial direction, serves to urge the actuator chamber subjected to high pressure from an annular space which is preferably subjected to low pressure, in particular from an annular space section extending in the axial direction between the locking ring and the end of the valve housing facing the valve closing body separate.

A further preferred embodiment of the temperature switching valve device is characterized in that an annular space section extending in the axial direction between the securing ring and the valve closing body facing the end of the valve housing, preferably via a throttle point, is in communication with the low pressure channel. Preferably, the locking ring is used together with the valve housing as a throttle point for a leakage oil flow occurring during operation.

A further preferred embodiment of the temperature switching valve device is characterized in that the locking ring between the expansion element or the actuator and the return spring means is arranged. The return spring device preferably comprises a restoring spring, which is clamped between the end of the valve housing facing the valve closing body and the securing ring. The retaining ring forms an abutment for the return spring.

A further preferred embodiment of the temperature switching valve device is characterized in that the return spring means is arranged in the annular space between the valve stem and the valve housing. Preferably, the return spring means is guided in the valve housing.

Another preferred embodiment of the temperature switching valve device is characterized in that the securing ring is coupled to the valve tappet. Preferably, the valve housing, the valve lifter and the retaining ring are designed as finished parts that need only be mated in the assembly.

Further preferred embodiments of the temperature switching valve device are characterized in that the securing ring by a bayonet closure or by a - A -

Snap connection or clip connection with the valve stem can be coupled or coupled. The locking ring may be releasably connected to the valve lifter.

Another preferred embodiment of the temperature switching valve device is characterized in that the retaining ring is made of plastic. The securing ring is preferably designed as an injection molded part, in particular fertigfallend.

A further preferred embodiment of the temperature switching valve device is characterized in that the valve housing is formed from plastic. The valve housing is preferably designed as an injection molded part, in particular fertigfallend.

In a pump, in particular a lubricant pump of an internal combustion engine, the above-stated object is achieved by a temperature switching valve device described above. The pump is preferably a multi-flow, in particular double-flow, vane pump. At least one tide of the vane pump is switched on only from a certain switching temperature. For this purpose, an expansion element is used, which is also referred to as Dehnstoffaktor and comprises a Dehnstoffkolben, which executes a switching stroke when reaching or exceeding the switching temperature. The Dehnstoffkolben is coupled via the valve stem so with the valve closing body, that the valve closing body interrupts the connection between the high pressure passage and the low pressure passage when the Dehnstoffkolben performs a switching stroke. When the expansion flask cools, it only partially recoils. The return spring means serves to fully reset the Dehnstoffkolben again.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail. Show it:

Figure 1 is a schematic representation of a vane pump with a temperature switching valve device in the open state;

Figure 2 is the same view as in Figure 1 with the temperature switching valve device in the closed state; Figure 3 shows an embodiment of the temperature switching valve device in the open

Condition in longitudinal section;

FIG. 4 shows the temperature switching valve device from FIG. 3 in the closed state;

Figure 5 shows a part of the temperature switching valve device of Figures 3 and 4 in longitudinal section;

FIG. 6 shows the view of a section along the line VI-VI in FIG. 5;

Figure 7 is a similar view as in Figure 5 according to another embodiment;

8 shows the view of a section along the line VIII-VIII in Figure 7 and

9 shows the view of a section along the line IX-IX in Figure 8.

In the figures 1 and 2, a pump 1 is shown in simplified section. The pump 1 is a vane pump. But it may also be another positive displacement pump, such as a roller-cell pump or a gear pump. Such pumps can be used for example as power steering pumps or lubricating oil pumps for motor vehicles.

The vane pump 1 comprises a pump housing with a lifting ring 3, which is arranged between two side surfaces (not visible). Within the cam ring 3, a rotor 4 is rotatably arranged. In the rotor 4 slots are recessed in which wings 5, 6 are arranged radially displaceable. By an arrow 8, the rotational movement of the rotor 4 in the housing 3 is indicated.

The rotor 4, the cam ring and the housing side surfaces each delimit, between two adjacent vanes, a displacer space whose volume changes as the rotor rotates. It comes in pump chambers 11, 12, which are also referred to as suction or low pressure chambers, to an increase in volume, which causes suction of a working fluid, in particular of hydraulic oil in the respective suction chamber. At the same tig it comes in the pump chambers 14, 15, which are also referred to as pressure chambers or high-pressure chambers, to a volume decrease, which causes a conveying of the working fluid from the respective pressure chamber.

The low pressure chamber 11 is connected via a low pressure line 21 to a tank 20 for the working medium. The low pressure chamber 12 is also connected via a low pressure line 22 to the tank 20. The high pressure chamber 14 is connected via a high pressure line 24 with at least one consumer in connection, as indicated by an arrow 26. The high-pressure chamber 15 is connected via a high-pressure line 25 via a Bypasska- channel 28 and a low-pressure line 29 to the tank 20 in connection.

The bypass passage 28 is closable by a temperature control valve device 30 which includes a high pressure passage communicating with the high pressure passage 25 and a low pressure passage communicating with the low pressure passage 29. The temperature control valve device 30 comprises an actuator 31 with a Dehnstoffkolben, which, as indicated by an arrow 32, can expand so that it closes the bypass channel 28, as indicated in Figure 2. In Figure 1, the expansion flask of the actuator 31 is indicated in its retracted position. In Figure 2, the actuator 31 is shown with the Dehnstoffkolben in its extended position.

The high-pressure line 25 can be connected via a check valve 34 to a further high-pressure line 33, which, like the high-pressure line 24, is connected to the consumer 26. The check valve device 34 comprises a check ball 35 which prevents a backflow of high-pressure working medium from the high-pressure line 33 into the high-pressure line 25.

In FIG. 1, the bypass channel 28 is opened, so that the working medium conveyed from the high-pressure chamber 15 into the high-pressure line 25 during operation of the vane pump 1 passes into the tank 20 via the bypass channel 28 and the low-pressure line 29. Thus, in this switching state of the temperature control valve 30 only a flood from the high pressure chamber 14 via the high pressure line 24 is conveyed to the consumer.

In FIG. 2, the bypass channel 28 is closed by the actuator 31 with the expansion flask. As a result, the pressure in front of the check ball 35 increases until it reaches the associated seat lifts, as indicated by an arrow 36. In the switching state of the temperature control valve device 30 shown in FIG. 2, in addition to the first flood from the high-pressure chamber 14, a second flood from the high-pressure chamber 15 is conveyed via the high-pressure line 25 and the high-pressure line 33 to the consumer. In particular, to save fuel, the second tide of the double-vane vane pump 1 is switched on only from a predetermined temperature.

In FIGS. 3 and 4, a section of a pump 40, as shown in simplified form in FIGS. 1 and 2, is shown in section through a pump housing 43. An arrow 44 indicates a bypass channel in FIG. 3, which connects a high-pressure passage 45, which communicates with one of the high-pressure chambers of the pump, to a low-pressure passage 46, which communicates with a tank. The high-pressure passage 45 and the low-pressure passage 46 open into a receiving space 50 which has various receiving space sections 51, 52, 53. The receiving space portions 51 to 53 each have the shape of circular cylinders of different diameters.

The receiving space 50 serves to receive a temperature control valve device 60, as shown in simplified form in FIGS. 1 and 2 and designated by 30. In the accommodating space 51 and a part of the accommodating space 52 of the accommodating space 50, a valve housing 62 is accommodated. The valve housing 62 comprises a substantially circular cylindrical jacket-shaped guide section 63, which is closed at its end facing the high-pressure passage 45 by an end wall 64 which has a central through-hole 65. At its end facing away from the high-pressure passage 45, the valve housing 62 has a collar 66, which is arranged in the receiving space section 52 and forms a stop when the valve housing 62 is positioned in the receiving space 50.

In the valve housing 62, a valve stem 68 is arranged, which extends through the through hole 65 in the end wall 64 therethrough. At the high pressure passage 45 facing the end of the valve stem 68, a valve closing body 69 is formed. The valve closing body 69 is integrally connected to the valve stem 68 and has a sealing edge or sealing surface, which is spaced in Figure 3 by a sealing surface 70 or sealing edge, which is provided on the pump housing 43 between the high pressure passage 45 and the low pressure passage 46. In the radial direction between the valve stem 68 and the guide portion 63 of the valve housing 62, an annular space 72 is formed, which is limited in the axial direction to the high-pressure passage 45 from the end wall 64. In the annular space 72, a return spring means 74 is arranged, preferably guided. The return spring device 74 comprises a helical compression spring, which is clamped between the end wall 64 and a securing ring 76. The securing ring 76 has the shape of a sleeve which is in the shape of a cylindrical cylinder shell and is movable back and forth in the annular space 72 in the axial direction.

Radially within the locking ring 76, the valve stem 68 has an annular groove 78 with a rectangular cross-section. The annular groove 78 serves to receive projections 81, 82, which extend from the inner surface of the locking ring 76 radially inwardly. The projections 81, 82 serve to position the circlip 76 in the valve housing 62 relative to the valve lifter 68. Due to the expansion of the annular groove 78 in the axial direction, a relative movement between the locking ring 76 and the valve stem 68 in the valve housing 62 is made possible. The term axial direction in the context of the present invention refers to the longitudinal axis of the temperature control valve device 60, which is designated 80 in FIGS. 3 and 4.

In the receiving space 52, a housing part 85 is received, which has substantially the shape of a right circular cylinder. From the high-pressure passage 45 facing away from the end face of the housing part 85, a further housing part 86 extends into the receiving space portion 53. The further housing part 86 serves to guide an overstroke spring 88 which is clamped in the axial direction between the housing part 85 and a closure piece 90. The overstroke spring 88 serves to allow an axial compensating movement of the temperature valve device 60 toward the lid 90. This can prevent overstretching. The closure piece 90 serves with the interposition of a sealing ring 91 to close the receiving space 50 pressure-tight. The housing parts 85 and 86 form a housing for the expansion element.

Between the high pressure passage 45 facing end face of the housing part 85 and the collar 66 of the valve housing 62, a spacer ring 92 is clamped in an actuator chamber 94. The spacer ring 92 surrounds an actuator 95, which is arranged in the actuator chamber 94. The actuator 95 comprises a piston 96 of the expansion element 85, 86, which is shown in Figure 3 in its non-extended and in Figure 4 in its extended state. The actor 95 acted upon via coupling elements 98, which are preferably integrally connected to the actuator 95, the locking ring 76 and / or the valve stem 68. In Figure 3, the locking ring 76 is in contact with the coupling elements 98 of the actuator 95. About a suitable biasing force of the return spring means 74th The piston 96 is caused to retract from its extended condition to its unextended condition as the expansion element cools.

In Figure 4, the piston 96 is shown in its extended, that is heated state of the expansion element. Due to the expansion of the expansion element 85, 86 and the resulting extension of the piston 96, the actuator 95 has moved away from the positioning element 85. As a result of the displacement of the actuator 95, the valve tappet 68 in contact with the actuator 95 has moved toward the high-pressure passage 45 in such a way that the valve-closing body 69 bears against the associated sealing edge or sealing surface 70, so that the bypass passage between the high-pressure passage 45 and the low-pressure passage 46 is closed. The locking ring 76 has due to the high pressure in the actuator chamber 94, which is also referred to as Aktorraum, against the biasing force of the return spring 74 on the end wall 64 moves.

The valve closing body 69 and the valve lifter 68 integrally connected thereto are hollowed inside and provided with a central through-hole 110 having a through-hole portion 111 and a through-hole portion 112. The through hole 110 provides a pressure equalizing connection between the high pressure passage 45 and the actuator chamber 94. In this case, the pump leakage between the through hole 110 and the actuator chamber 94 and the low pressure channel 46 kept low. According to an essential aspect of the present invention, the valve housing 62, the valve stem 68 and the locking ring 76 are formed as a finished injection-molded plastic parts. Preferably, the actuator 95 is also formed as a finished injection molded plastic.

FIGS. 5 and 6 show an assembly unit which comprises the valve housing 62, the valve tappet 68 and the securing ring 76. During assembly, the parts are simply put together and held together by a kind of snap connection. The Snap connection comprises a total of four projections 81 to 84, which extend from the retaining ring 78 radially inwardly. When assembling the retaining ring 78 is pushed so far into the annular space 72 until the projections 81 to 84 are arranged in the annular groove 78.

FIGS. 7 to 9 show a similar exemplary embodiment as in FIGS. 5 and 6, in which the securing ring 76 is positioned relative to the valve tappet 68 with the aid of a kind of bayonet closure. For this purpose, four projections 121 to 124 are provided on the retaining ring 76, which extend radially inwardly. In the assembled state, the projections 121 to 124 are arranged in the annular groove 78. At the end of the valve tappet 78 facing away from the valve closing body 69, four projections 131 to 134 are formed, which extend radially outward. The projections 131 to 134 are arranged and dimensioned so that they form an axial stop for the projections 121 to 124, when they are brought into coincidence with the projections 131 to 134.

LIST OF REFERENCE NUMBERS

1st pump 51. receiving space section

3rd stroke ring 52. receiving space section

4. Rotor 53. receiving space section

5. Sash 60th temperature control valve device

6. Wing 62. Valve housing 8. Arrow 63. Guide section

11. Pump room 64. End wall

12. pump room 65th through hole

14. Pump room 66th fret

15. Pump chamber 68. Valve tappet

20. Tank 69 valve closing body

21. Low pressure line 70th sealing surface

22. Low pressure line 72nd annulus

24. High-pressure line 74. Return spring device

25. High pressure line 76. Circlip

26. arrow 78. annular groove

28. Bypass channel 80th longitudinal axis

30. Temperature control valve device 81. projection

31. Actuator 82. Vorsprung

32. arrow 83. projection

33. High pressure line 84. projection

34. High pressure line 85. Housing part

35. check ball 86th housing part

36. arrow 88. overstroke spring 40. pump 90th stopper

43. Pump housing 91. Sealing ring

44. arrow 92. Spacer ring

45. High pressure channel 94. Aktorkammer

46. Low pressure channel 95. Actuator 50. Receptacle 96. Piston 98. Coupling elements

1 10. Through hole

111. through-hole section

1 12. Through hole section

121st lead

122. advantage

123. advantage

124. advantage

131st lead

132nd advantage

133rd lead

134th lead

Claims

claims

1. Temperature switching valve device for a pump (1; 40), in particular for a lubricant pump of an internal combustion engine, having a valve housing (62) in which one end of a valve tappet (68) is accommodated, at the other end of which a valve closing body (69) is provided, a connection between a high pressure passage (45) and a low pressure passage (46) in response to the expansion of a Dehnstoffelements releases or interrupts, which acts on the valve stem (68) and by a in the valve housing (62) supported return spring means (74) is acted upon , characterized in that the valve closing body (69) has a through hole (110).

Second temperature switching valve device according to claim 1, characterized in that the high-pressure channel (45) via the through hole (110) with an actuator chamber (94) is in communication, in which the expansion element is arranged.

3. Temperature switching valve device according to one of the preceding claims, characterized in that the through hole (110) through the valve closing body (69) and the valve stem (68) extends through into the actuator chamber (94).

4. Temperature switching valve device according to one of the preceding claims, characterized in that the valve tappet (68) is designed to be hollow inside.

5. Temperature switching valve device according to one of the preceding claims, characterized in that the valve stem (68) is integrally connected to the valve closing body (69).

6. Temperature switching valve device according to one of the preceding claims, characterized in that the valve tappet (68) and / or the valve closing body (69) are formed from plastic / is.

7. Temperature switching valve device according to one of the preceding claims, characterized in that between the valve stem (68) and the valve housing (62) an annular space (72) is formed in which a locking ring (76) is guided reciprocally movable.

8. Temperature switching valve device according to claim 7, characterized in that in the axial direction between the locking ring (76) and the valve closing body (69) facing the end of the valve housing (62) extending annular space portion, preferably via a throttle point, with the low-pressure channel (46). communicates.

9. Temperature switching valve device according to claim 7 or 8, characterized in that the securing ring (76) between the expansion element and the return spring means (74) is arranged.

10. temperature switching valve device according to one of claims 7 to 9, characterized in that the return spring means (74) in the annular space (72) between the valve stem (68) and the valve housing (62) is arranged.

11. Temperature switching valve device according to one of claims 7 to 10, characterized in that the securing ring (76) with the valve tappet (68) is coupled.

12. Temperature switching valve device according to claim 11, characterized in that the securing ring (76) can be coupled or coupled by a bayonet closure with the valve tappet (68).

13. Temperature switching valve device according to claim 11, characterized in that the securing ring (76) can be coupled or coupled by a snap connection or clip connection with the valve tappet (68).

14. Temperature switching valve device according to one of claims 7 to 13, characterized in that the securing ring (76) is formed from plastic.

15. Temperature switching valve device according to one of the preceding claims, characterized in that the valve housing (62) is formed from plastic.

16. Pump, in particular a lubricant pump of an internal combustion engine, with a temperature switching valve device (30, 60) according to one of the preceding claims.