WO2001098651A2

WO2001098651A2 - Device for transmitting a movement with compensation for play

Info

Publication number: WO2001098651A2
Application number: PCT/DE2001/002256
Authority: WO
Inventors: Wolfgang Bloching; Reda Rizk; Willibald SCHÜRZ
Original assignee: Siemens Aktiengesellschaft
Priority date: 2000-06-20
Filing date: 2001-06-19
Publication date: 2001-12-27
Also published as: WO2001098651A3; EP1292775A2; DE10030232A1

Abstract

The invention relates to a device for transmitting a movement with compensation for play. Said device comprises a cylinder (1, 21), at least one piston (2, 22, 23), and an elastic storage reservoir (4, 30) for a transmission medium. A pressure space (6, 26) is formed between the piston (2, 22, 23) and the cylinder (1, 21). The pressure space (6, 26) and the storage reservoir (4, 30) are connected to one another via an annular gap (15, 44), which is located between the cylinder (1, 21) and the piston (2, 22, 23), and via an additional passage (5, 40). Said additional passage (5, 40) comprises a flow-through direction and a blocking direction.

Description

description

Device for transmitting a movement with play compensation

The invention relates to a device for transmitting a movement and / or for compensating for play according to the preamble of patent claim 1.

In the case of various drives, for example when controlling / driving valves, a minimal play or a defined maximum contact force between an actuator and a driven component is a prerequisite for reliable operation of the drive. In particular when using piezo actuators as drives, this represents an essential operating condition because piezo actuators enable high actuation forces, but the actuator strokes that can be represented are very small. Due to changes in length as a result of temperature changes, manufacturing tolerances and signs of wear, at least a certain amount of functional play must be provided in systems without play compensation, but this reduces the working stroke accordingly.

Piezo actuators lose a not negligible proportion of the useful stroke. By using a play compensation, a drive can be kept free of play so that the entire actuator stroke is available as a useful stroke.

From German published application 197 08 304 is one

Device for transmitting a movement to an injection valve is known, which comprises a transmission module with a pressure chamber and an equalizing chamber. The transmission module is arranged between a piezo actuator and a valve tappet. The pressure chamber and compensation chamber are filled with a transmission medium, the pressure chamber being closed on one side by a membrane and connected to the compensation chamber via a throttle arranged on the opposite side. The compensation chamber is on one side by a prestressed spring plate or a fixed derbeaufschlagte second membrane completed, are above the compensation chamber and pressure chamber under a predetermined pressure. The throttle is designed in such a way that short pressure differences are hardly compensated for and long pressure differences are completely compensated for. A misalignment due to temperature change or wear is compensated for by a flow of the transmission medium from compensation chamber to pressure chamber and vice versa. The disadvantage is that possible play compensation is limited by the maximum curvature of the membrane of the pressure chamber that can be achieved. A quick and brief refilling of the pressure chamber with the transmission medium from the compensation chamber is not possible because of the throttle function described above.

From the international publication 98/15018 a device for transmitting a deflection of a piezoelectric actuator with a pressure chamber is known, the pressure chamber being filled with a working medium and being delimited on both sides by a first and a second membrane. The pressure chamber is arranged between the actuator and a plunger in such a way that the first membrane is the actuator and the second membrane is the

Pusher is assigned. A deflection of the actuator is transmitted to the tappet via the first and second diaphragms, the first and second diaphragms having different effective areas of different sizes. Match compensation via a compensation chamber is not provided.

From the European publication EP 0 947 690 a valve for controlling liquids with a hydraulic translator is known. A pressure chamber is provided between two pistons, which are displaceably arranged in a housing. To compensate for liquid losses in the pressure chamber, control chambers are formed behind the pistons, the control chambers and pistons being sealed by a membrane. The control rooms are connected to a drain hole via throttle bores. The throttle bores have a sharp-edged and in the direction of relief of the control room a rounded transition in the filling direction. Appropriate dimensioning means that a sufficient minimum pressure for refilling the pressure chamber is set in the control rooms. During a piston stroke, a counter pressure against the leakage oil flow from the pressure chamber is built up in the direction of this control chamber via the membrane surface assigned to the one piston in the one control chamber. At the same time, the other control chamber is refilled with the assigned diaphragm via the throttle bore and due to the opposite movement of the other piston.

In the case of common rail injectors, a number of hydraulic lash adjusters have also been proposed, which are designed as open systems and use diesel fuel, e.g. from the leak, use as hydraulic fluid. The disadvantage of these systems is that gas-free filling of the transmission path is not ensured under all operating conditions.

In contrast, the invention has for its object to overcome the disadvantages of the above prior art.

To solve this problem, a device with the features of claim 1 is proposed.

Accordingly, in a device for transmitting a movement and / or for compensating for play, the pressure space and the elastic storage reservoir are connected to one another via a passage, the passage having a passage and a blocking direction, so that a flow of the transmission medium from the storage reservoir to the Pressure space allows and a flow in the opposite direction is essentially blocked.

The device according to the invention ensures gas-free filling of the transmission path under all operating conditions, with the annular gap and the passage thus how the pressure chamber and the storage reservoir, in particular, a closed system can be formed. A quick loss compensation of the transmission medium in the pressure chamber is ensured via the passage. By the immediate ^"re formation of the pressure space between the cylinder and piston, a play compensation over a wide range is possible. The inventive device may be implemented as a pure metal type, thereby promoting a high load capacity and durability.

Advantageous refinements of the invention result from the subclaims.

The invention is illustrated in the drawings using exemplary embodiments and is explained in more detail below with reference to the drawings.

Fig. 1 shows a sectional side view of a first

Embodiment of a device for transmitting a movement and / or play compensation without stroke translation and

Fig. 2 shows a sectional side view of a second embodiment of a device for transmitting a movement and / or play compensation with stroke translation and integrated movement reversal.

1 shows a first embodiment of a device according to the invention for transmitting movement and / or play compensation, with no stroke ratio being provided. The device has a cylinder 1 with a guide, in which a piston 2 is slidably arranged with minimal radial play. A pressure chamber 3 is formed between an end face 14 of the piston 2 and the guide 16 of the cylinder 1. 00 to co M o in o cπ o cπ

Piezoelectric actuator. The force applied by the piezo actuator acts via the piston 2, the pressure chamber 3 and the end face 12 of the cylinder 1 on an element (not shown) to be actuated. This can be a control valve, for example. As a result of the force effect of the piezo actuator in the deflected state, the pressure in the pressure chamber 3 increases and a small amount of transmission medium escapes from the pressure chamber 3 into the storage reservoir via the annular gap 15.

In the time in which the piezo actuator is not activated, the transmission medium in the pressure chamber 3 can be via the

Passage 5 and valve 6 are added again. The static pressure in the storage reservoir 4 and the metal bellows 9, 10, which simultaneously act as compression springs, generate a defined contact force between the actuator and the element to be actuated in this phase. Changes in the adjustment or coordination of the individual components due to temperature expansion, wear and the like are compensated for by the corresponding change in pressure by a corresponding flow of the transmission medium.

FIG. 2 shows a second embodiment of the device according to the invention for transmitting a movement and / or play compensation, wherein a stroke ratio with integrated movement reversal is provided. A cylinder 21 is clamped with its two flat surfaces 24 into a housing, for example an injector housing. Two pistons 22, 23, one of which is designed as a hollow piston 22 and the other as a reciprocating piston 23, are inserted in the cylinder 21. The hollow piston 22 runs in a guide 45 of the cylinder 21 and the reciprocating piston 23 in a corresponding guide 46 of the hollow piston 22.

A pressure chamber 26 is formed by adjacent end faces 42, 43 of the pistons 22, 23 arranged one inside the other and the guidance of the ÜO LJ co to M μ> cπ O LΠ o cπ o cπ

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Carried medium from the feeder reservoir, which escapes as a leak when the piezo actuator is actuated from the pressure chamber 26. The metal bellows 31, 32 of the storage reservoir 30 do not perform a spring function in this embodiment of the invention.

In both embodiments, a gas-free filling of the entire interior with the transmission medium is required for a loss-free force-distance transmission.

Claims

claims

1. A device for transmitting a movement and / or for compensating play, comprising a cylinder (1, 21) with a

Guide (16, 45, 46), at least one piston (2, 22, 23) and an elastic storage reservoir (4, 30) for a transmission medium, the piston (2, 22, 23) in the guide (16, 45, 46) of the cylinder (1, 21) is arranged and between the guide (16, 45, 46) and an end face (14, 42, 43) of the

A pressure chamber (6, 26) is formed in the piston, the pressure chamber (6, 26) is filled with the transmission medium, and the pressure chamber (6, 26) and the storage reservoir (4, 30) are arranged so that they are at least indirectly Are connected to one another via an annular gap (15, 44) between the cylinder (1, 21) and piston (2, 22, 23), characterized in that the cylinder (1, 21), the piston (2, 22, 23), the storage reservoir (4, 30), the pressure chamber (6, 26), the annular gap (15, 44) and the passage (5, 40) form a closed system for the transmission medium.

2. Device according to claim 1, characterized in that the pressure chamber (6, 26) and the elastic storage reservoir (4, 30) are connected to one another via a passage (5, 40), the passage (5, 40) being one

Passage and a blocking direction, so that a flow of the transmission medium from the storage reservoir (4, 30) to the pressure chamber (6, 26) enables and a flow in the opposite direction is substantially blocked.

3. Device according to one of claims 1 or 2, characterized in that the passage (5, 40) comprises a valve (6, 29) to achieve the passage and blocking effect.

4. Device according to one of claims 1 to 3, characterized in that the passage (5, 40) in the at least one piston (2, 23) is provided.

^'5. The apparatus any one of claims 1 to 4, characterized in that the elastic storage reservoir (4, 30) is configured such that a volume of the transfer medium to the pressure space (6, 26) is supplied for compensating, substantially no change of the static pressure of the storage reservoir (4, 30).

6. Device according to one of claims 1 to 5, characterized in that the elastic storage reservoir (4, 30) from two nested metal bellows (9, 10, 31, 32) is constructed.

7. Device according to one of claims 1 to 6, characterized in that means (7, 8, 38, 39) are provided for filling the device with the transmission medium.

8. The device according to claim 7, characterized in that the means (7, 8, 38, 39) for filling the device open into the pressure chamber (6, 26).