CN113175490A - Damping unit for an electromechanically controlled system - Google Patents
Damping unit for an electromechanically controlled system Download PDFInfo
- Publication number
- CN113175490A CN113175490A CN202110080379.1A CN202110080379A CN113175490A CN 113175490 A CN113175490 A CN 113175490A CN 202110080379 A CN202110080379 A CN 202110080379A CN 113175490 A CN113175490 A CN 113175490A
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- CN
- China
- Prior art keywords
- damping unit
- piston
- stop
- sleeve
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000013016 damping Methods 0.000 title claims abstract description 65
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 229920001187 thermosetting polymer Polymers 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000206 moulding compound Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
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- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3278—Details for lubrication
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- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- 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
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/028—Gearboxes; Mounting gearing therein characterised by means for reducing vibration or noise
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention relates to a damping unit (12) for an electromechanically controlled system (10), wherein the damping unit (12) has an axially movable piston (18), wherein the piston (18) can be moved relative to a stop (20) within the damping unit (12), wherein a restoring element (22) configured to restore the piston (18) is arranged between the stop (20) and the piston (18). The electromechanically controlled system (10) has a housing (14), the housing (14) having an opening (16) for accommodating the damping unit (12). According to the invention, for variable assembly, the piston (18) is movably accommodated in a sleeve (34), wherein the stop (20) adjoins the sleeve (34) and can be connected in a pressure-tight manner to the sleeve (34).
Description
Technical Field
The invention relates to a damping unit for an electromechanically controlled system.
Background
The automatic transmissions, brakes or clutches of the present motor vehicles preferably utilize hydraulic valves, in particular electromagnetically actuatable hydraulic valves, wherein the hydraulic valves are also referred to as pressure control valves or directional control valves. The hydraulic valve has a valve piston movably accommodated in a housing, the movement of which is initiated by means of a signal element. The valve piston, which is accommodated movably in the housing, is thus moved by the force exerted. The system pressure, which applies a force to the consumer, is related to the positioning of the valve piston, which generates the outlet pressure of the hydraulic valve. The system pressure is constantly stable, which is of essential importance. Therefore, damping elements or damping units are usually provided in order to eliminate or reduce interfering pressure fluctuations on the valve piston. In order to compensate for pressure fluctuations, hydraulic damping units are used, for example, in systems controlled by electromechanical actuators in different fields of application. Pressure oscillations in a defined pressure range, for example in the so-called "half-engagement point" range of the clutch, are to be damped by means of a predetermined working volume of the damping unit.
Disclosure of Invention
The object of the invention is to provide a damping unit for an electromechanically controlled system, which is applied to different housing materials.
The aforementioned object is achieved with the features according to the invention. Advantageous embodiments and advantages of the invention result from the description and the drawings.
A damping unit for an electromechanically controlled system is proposed, wherein the damping unit has an axially movable piston which is movable relative to a stop within the damping unit. A restoring element configured to restore the piston is arranged between the stop and the piston. The electromechanically controlled system has a housing with an opening for accommodating the damping unit. According to the invention, for variable assembly, the piston is movably accommodated in a sleeve, wherein the stop is configured to abut against the sleeve and can be connected pressure-tightly thereto. The variable assembly is, for example, the assembly of the damping unit into a housing, which is made of plastic, in particular a thermoset material. Here, the piston of the damping unit according to the invention is reliably guided in the sleeve. The damping unit can therefore also be accommodated in a housing which is substantially unsuitable or not very suitable for movably accommodating the piston.
By accommodating the piston in a sleeve, which is made of a material having the same properties as the piston, the influence of thermal expansion can also be minimized. This may result in narrow gaps, which may lead to smaller leaks. This is not possible in the damping unit which is arranged in the opening without a sleeve, or is possible only in the case of conditions. The piston is thus moved in a cylinder constructed by means of a sleeve, rather than directly in the valve block as in the prior art. It is therefore possible to assign the damping unit to the electromechanically controlled system independently of the valve block.
Preferably, the sleeve and the stop are connected in a pressure-tight manner by means of a material-fit connection. The connection may be made during assembly, for example after the sleeve has been placed in an opening in the housing of the hydraulic unit or in a separate housing which is connected to the hydraulic unit by means of a hydraulic line. Preferably, however, the material-fit connection is formed before the damping unit is assembled. The damping unit is thus configured in the shape of a so-called cassette element and can be inserted in a simple manner completely assembled into the housing with the opening.
In a further embodiment, the stop has a thread on its outer circumference in order to make it possible to screw the damping unit in, which makes the assembly of the damping unit simple. In particular, if the thread is self-tapping, it is possible to screw the damping unit into a housing made of, for example, a thermosetting plastic, without the need to previously insert a corresponding thread into the opening. This allows a cost-effective assembly, since no mating thread, which is complementary to the thread of the stop, has to be inserted into the opening.
The self-contained system of the damping unit according to the invention is therefore configured in the shape of a screw which at the same time serves to receive the restoring element and serves as a stop for the piston, for example which can be screwed into a housing, for example into a valve block made of thermosetting plastic.
The damping unit represents a self-contained system that can be screwed into the valve block and replaced. Simple assembly in thermosetting plastics is possible by special bolts with self-tapping threads.
For further simplified assembly, the stop has a receiving opening for receiving an assembly means, whereby a simple handling of the damping unit is achieved.
In a further embodiment of the damping unit according to the invention, the sleeve has a support ring at its trailing end facing the stop formation, which support ring serves for the seating of a sealing element. Before the damping unit is assembled, the sealing element is pushed onto the sleeve in such a way that it rests against the support ring and is arranged fixed in the axial direction by means of the support element. Finally, the entire damping unit including the sealing element is fitted into the opening. The sealing element can therefore be arranged on the damping element in a loss-proof manner by means of the support ring.
In order to reduce weight, reduce friction and center the sleeve, the envelope of the piston has different outer diameters over the axial length of the piston. In other words, when the movement gap between the sleeve and the piston is configured, the larger outer diameter corresponds to the inner diameter of the sleeve, and at least one outer diameter of the piston, which differs from the larger outer diameter configuration, is configured smaller, whereby the movement gap in the region of the smaller outer diameter is larger and contact between the sleeve and the piston is reliably avoided.
By means of the described embodiment of the damping unit according to the invention, the damping unit can furthermore advantageously be flexibly adapted to the requirements of the user.
Drawings
Other advantages will be derived from the following description of the figures. Embodiments of the invention are illustrated in the drawings. The figures and the description contain a number of combinations of features. Those skilled in the art can also appropriately consider these features alone and conclude other combinations of significance.
The figures are exemplary:
FIG. 1 illustrates a partial cross-sectional view of a hydraulic unit for an automatic transmission having a damping unit according to the prior art;
fig. 2 shows a longitudinal section through a damping unit according to the invention.
Detailed Description
In the drawings, the same or similar components are denoted by the same reference numerals. The drawings are only for purposes of illustration and are not to be construed as limiting.
Fig. 1 shows, in a partially sectioned view, an electromechanically controlled system in the form of a hydraulic unit 10 for an automatic transmission, not shown in detail, wherein the hydraulic unit 10 has a damping unit 12 according to the prior art. The damping unit 12 is provided to eliminate or reduce pressure fluctuations in the hydraulic unit 10.
The hydraulic unit 10 has a housing 14, the damping unit 12 being integrated in the housing 14 and being accommodated in an opening 15. The damping unit 12 comprises a piston 18, the piston 18 being received in the opening 16 in an axially movable guided manner. A stop 20 is accommodated in the opening 16, which stop 20 serves on the one hand to partially close the opening 16 and on the other hand to define the stroke H of the piston 18. Furthermore, the stop 20 serves to receive a restoring element 22, the restoring element 22 being received at one end on the stop 20 and at the other end on the piston 18. For fixing the restoring element 22, which is preferably designed in the form of a helical spring, the piston 18 has a first receiving opening 24 and the stop has a second receiving opening 26.
The opening 16 is configured to be through-flow, wherein, in the region of the piston 18, a certain pressure p is applied to the end face 30 of the piston 18 via an inlet 28. By applying pressure, the piston 18 is moved in the axial direction, wherein the piston 18 has a maximum stroke H, which is defined by the abutment of the piston on the end face 30 of the housing 14 by the stop of the piston 18 on the stop 20. In order that the stop 20 is not pressed out of the housing 14 by the stop of the piston 18, the stop 20 is fixed in the housing 14 by means of a fastening element 32 without being lost. In order to achieve pressure equalization via the second receiving opening 26, hydraulic fluid located in the opening 16 and air present in the opening 16 escape, the second receiving opening 26 being designed to pass completely through the stop 20 in the axial direction.
The restoring element 22 is arranged such that the pressure damping in the region of the maximum stroke H, which has a working volume formed between the end face of the stop 20 and the end face of the piston 18, is effective in a defined working region.
The damping unit 12 according to the invention is shown in longitudinal section in fig. 2. The damping unit 12 has a piston 18 movably received in a sleeve 34. The stop 20 adjoins the sleeve 34 and is connected in a pressure-tight manner to the sleeve 34. In the present exemplary embodiment, a pressure seal is produced between the stop 20 and the sleeve 34 by means of a welded joint, wherein the pressure seal can also be formed by means of a further material-fit connection. The pressure-tight connection can also be formed by a force-and form-fitting connection between the sleeve 34 and the stop 20.
The damping unit 12, including the stop 20, is accommodated in the housing 14 in the form of a complete unit or also as a cartridge element. In other words, the damping unit can be preassembled and inserted in one piece into the housing 14.
The stop 20 of the damping unit 12 according to the invention has a self-tapping thread or in other words a cut thread 46 on its outer circumference 36, whereby, in the first assembly in the housing 14, a force-fitting and form-fitting connection can be produced by means of the thread 46, the damping unit 12 preferably being constructed from metal. To achieve a lightweight construction, the housing 14 is constructed from a thermosetting plastic, for example Vyncolit (inorganic and organic filled phenolic moulding compound). The housing 14 can likewise be made of another material, wherein the material of the housing 14 must be suitable for producing a force-fitting and form-fitting connection with the stop 20 by means of the stop 20 in order to receive the self-tapping thread of the stop 20.
However, the damping unit 12 can also be provided not completely preassembled in the housing 14. In a first step, the sleeve 34, which is embodied cost-effectively in the form of a deep-drawn part, is thereby inserted into the opening 16. The sleeve 34 has, on its rear end 38, which is configured to face the stop 20, a sealing element 40, preferably in the shape of an O-ring, which sealing element 40 is arranged to bear on a support ring 42 of the sleeve 34, which is configured on the rear end 38. The support ring 42 has a larger outer diameter than the outer envelope surface of the sleeve 34, whereby a support surface 44 is configured for supporting the sealing element 40. With a corresponding design of the opening, contamination resulting from assembly is closed by means of the sealing element 40 and thus cannot reach the hydraulic circuit of the electromechanical system.
In the stop 20, the second receiving opening 26 is designed to receive a mounting means. For this purpose, the receiving openings 26, which are formed axially completely through the stop 20, are implemented in multiple stages, wherein the receiving portions 26 have different diameters.
In the first stop section 48, which is formed facing the piston 18, the receiving opening 26 is formed in a first diameter D1 of the first stop section 48 for receiving the resetting element 22 and for achieving the movability of the resetting element 22, the resetting element 22 being supported in a first receiving bore 24 in the piston 18. In a second stop section 50, which is formed opposite the first stop section 48 or opposite the first stop section 48, the receiving opening 26 is formed in a second diameter D2 of the second stop section 50 for receiving a mounting means, which is designed, for example, in the shape of a hexagon socket screw. In the third stop section 52 located between the first stop section 48 and the second stop section 50, the third diameter D3 of the receiving opening 26 is configured to be smaller than the first diameter D1 and the second diameter D2, but at least so large that a pressure equalization for damping is possible when a force is exerted on the end face 30 of the piston 18. In order to be able to exert a force on the piston 18 by hydraulic fluid which normally flows out of a working connection, not shown in any more detail, of the hydraulic unit 10, the sleeve 34 has a channel 56 on its end-side sleeve surface 54 facing the inlet opening 28, through which channel 56 the hydraulic fluid can flow in and exert a force on the piston 18.
To achieve weight savings, reduced friction, and centering of piston 18 within sleeve 34, piston 18 may have a different outer diameter Da over its axial length L than a piston having an equal outer diameter Da over its axial length.
In a not further illustrated embodiment, the inner surface 60 of the sleeve 34 is coated in order to enable a reliable and fast functioning of the damping unit 12. In order to reliably regulate the axial movement of the piston 18, a small lubricating film of the hydraulic fluid is generally present between the piston 18 and the inner surface 60. However, if the lubricating film is insufficient, the axial movement of the piston 18 is nevertheless reliable because of the coating.
Claims (11)
1. A damping unit (12) for an electromechanically controlled system (10), wherein the damping unit (12) has an axially movable piston (18), the piston (18) being movable relative to a stop (20) within the damping unit (12), wherein a resetting element (22) configured for resetting the piston (18) is arranged between the stop (20) and the piston (18), and wherein the electromechanically controlled system (10) has a housing (14), the housing (14) having an opening (16) for accommodating the damping unit (12), characterized in that,
for variable assembly, the piston (18) is movably accommodated in a sleeve (34), wherein the stop (20) is configured to abut against the sleeve (34) and can be connected in a pressure-tight manner to the sleeve (34).
2. Damping unit (12) according to claim 1,
the sleeve (34) and the stop (20) are connected in a pressure-tight manner by means of a material-fit connection.
3. Damping unit (12) according to claim 1 or 2,
the stop (20) has a thread (46) on its outer circumference (36).
4. Damping unit (12) according to claim 3,
the thread (46) is configured to be self-tapping.
5. Damping unit (12) according to one of the preceding claims,
the stop (20) has a receiving opening (26) for receiving a mounting means.
6. Damping unit (12) according to one of the preceding claims, characterized in that the sleeve (34) has a channel (56) on its end-side sleeve face (54) for applying a pressure to the piston (18), the sleeve face (54) being configured facing away from the stop (20).
7. Damping unit (12) according to one of the preceding claims,
the sleeve (34) has a support ring (42) at its rear end (38) which is configured to face the stop (20).
8. Damping unit (12) for a vehicle according to one of the preceding claims,
the return element (22) is embodied in the form of a helical spring.
9. Damping unit (12) for a vehicle according to one of the preceding claims,
the envelope (58) of the piston (18) has different outer diameters (Da) over the axial length (L) of the piston (18).
10. Damping unit (12) according to one of the preceding claims, characterized in that the sleeve (34) is configured in the shape of a deep-drawn piece.
11. An electromechanically controlled system (10), comprising a housing (14), the housing (14) having an opening (16) for accommodating a damping unit (12) according to one of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020101739.1 | 2020-01-24 | ||
| DE102020101739.1A DE102020101739A1 (en) | 2020-01-24 | 2020-01-24 | Damping unit for a mechatronically controlled system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113175490A true CN113175490A (en) | 2021-07-27 |
Family
ID=76753399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110080379.1A Pending CN113175490A (en) | 2020-01-24 | 2021-01-21 | Damping unit for an electromechanically controlled system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113175490A (en) |
| DE (1) | DE102020101739A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779284A (en) * | 2004-11-26 | 2006-05-31 | 索奈克斯工业有限公司 | Energy storing vibration absorber of clutch and method for preventing it from hydraulic leakage |
| CN201173220Y (en) * | 2008-03-10 | 2008-12-31 | 重庆华渝电气仪表总厂 | Energy storage device for independent hydraulic pressure regulator |
| DE102008026121B3 (en) * | 2008-05-30 | 2009-10-15 | Rausch & Pausch Gmbh | Spring-loaded piston accumulator with locking function |
| CN101680461A (en) * | 2007-03-09 | 2010-03-24 | 瓦特西拉芬兰有限公司 | Attenuator for damping pressure fluctuations in a hydraulic system |
| CN104619426A (en) * | 2012-09-13 | 2015-05-13 | 格瑞克明尼苏达有限公司 | Accumulator for airless sprayer |
| CN206111699U (en) * | 2016-08-31 | 2017-04-19 | 北京精密机电控制设备研究所 | Hydraulic pressure excess loading protector |
| CN107299952A (en) * | 2017-08-29 | 2017-10-27 | 宣昌黎 | Motor-driven reducing shock absorber |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3888490B2 (en) | 1997-11-14 | 2007-03-07 | 株式会社アイ・エイチ・アイ・エアロスペース | Pressure absorber |
| DE102010042334A1 (en) | 2010-10-12 | 2012-04-12 | Robert Bosch Gmbh | Method for manufacturing e.g. low pressure spring-piston battery utilized to store energy in hydraulic system of automatic transmission of motor car, involves permanently interconnecting housing members, where one member supports spring |
| DE102010043279A1 (en) | 2010-11-03 | 2012-05-03 | Continental Teves Ag & Co. Ohg | piston accumulators |
-
2020
- 2020-01-24 DE DE102020101739.1A patent/DE102020101739A1/en active Pending
-
2021
- 2021-01-21 CN CN202110080379.1A patent/CN113175490A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779284A (en) * | 2004-11-26 | 2006-05-31 | 索奈克斯工业有限公司 | Energy storing vibration absorber of clutch and method for preventing it from hydraulic leakage |
| CN101680461A (en) * | 2007-03-09 | 2010-03-24 | 瓦特西拉芬兰有限公司 | Attenuator for damping pressure fluctuations in a hydraulic system |
| CN201173220Y (en) * | 2008-03-10 | 2008-12-31 | 重庆华渝电气仪表总厂 | Energy storage device for independent hydraulic pressure regulator |
| DE102008026121B3 (en) * | 2008-05-30 | 2009-10-15 | Rausch & Pausch Gmbh | Spring-loaded piston accumulator with locking function |
| CN104619426A (en) * | 2012-09-13 | 2015-05-13 | 格瑞克明尼苏达有限公司 | Accumulator for airless sprayer |
| CN206111699U (en) * | 2016-08-31 | 2017-04-19 | 北京精密机电控制设备研究所 | Hydraulic pressure excess loading protector |
| CN107299952A (en) * | 2017-08-29 | 2017-10-27 | 宣昌黎 | Motor-driven reducing shock absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020101739A1 (en) | 2021-07-29 |
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Application publication date: 20210727 |