Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/08—Characterised by the construction of the motor unit
  • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
  • F15B15/1423—Component parts; Constructional details
  • F15B15/1447—Pistons; Piston to piston rod assemblies
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/20—Other details, e.g. assembly with regulating devices
  • F15B15/28—Means for indicating the position, e.g. end of stroke
  • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
  • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
• • 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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D25/00—Fluid-actuated clutches
  • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
  • F16D25/088—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member the line of action of the fluid-actuated members being distinctly separate from the axis of rotation
• • 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
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers
  • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
  • F16J1/006—Pistons; Trunk pistons; Plungers obtained by assembling several pieces of different materials
  • F16J1/008—Pistons; Trunk pistons; Plungers obtained by assembling several pieces of different materials with sealing lips
• • 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
  • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
  • F16D2300/00—Special features for couplings or clutches
  • F16D2300/18—Sensors; Details or arrangements thereof

Definitions

• the invention relates to a piston with a sensor element, in particular for a master cylinder or slave cylinder of a pressure medium actuating device, in particular for a motor vehicle.
• Pressure medium actuation devices such as hydraulic actuators, are known in the art, for example, for actuating clutches or transmissions of motor vehicles. They have a master cylinder and a slave cylinder, in each of which a piston is arranged displaceably, wherein the piston adjacent to a pressure chamber is arranged, in which a pressure medium is received.
• the slave cylinder piston is also displaced via the pressure medium transfer path and the pressure medium arranged therein, so that an actuation of an element to be actuated can be carried out.
• the position of at least one of the pistons in the pressure-medium cylinders For the purpose of controlling the function of the actuation, it is advantageous to know the position of at least one of the pistons in the pressure-medium cylinders.
• inductive sensor systems which have a coil with downstream electronics, which is arranged on the cylinder, wherein the piston is connected to an annular sensor element to a movement of the piston in the coil to induce a magnetic moment.
• an electrical signal is generated, which can be evaluated for position determination.
• the position or the movement of the piston can be detected by the inductive sensor system.
• the annular sensor elements have the disadvantage that they can not be conveniently connected to the piston in each piston geometry and they also have the disadvantage that a high cost of materials is available to form the complete ring. Therefore, it is the object of the invention to provide a piston with a sensor element, which is simple and inexpensive, yet allows a reliable and accurate detection of the position of the piston.
• An embodiment of the invention provides a piston with a sensor element, wherein the piston has a substantially cylindrical wall with two opposite end faces of the cylindrical wall protrude preferably in the region of the end faces radially outward annular regions which serve as guide surfaces, wherein the sensor element is provided as a segment, in particular as a ring segment, between the end faces or the annular regions on the cylindrical wall.
• the segment is a substantially flat ring segment. This can preferably emerge from a flat planar element by bending.
• the segment is made of aluminum or an aluminum alloy.
• the segment is made of a sheet metal or a foil.
• the sensor element is connected by means of positive and / or frictional and / or cohesive connection with the wall of the piston.
• the cohesive connection can also be made by caulking of sensor element and piston. Thereby, the sensor element can be easily connected to the piston or manufactured together. It is also advantageous if the sensor element is attached by gluing on the wall. By gluing a simple manufacturing process can be performed and yet a secure position fixation can be made.
• the gluing of the sensor element on the wall by means of an applied adhesive by means of an adhesive film and / or by means of molten material of the piston.
• the plastic can be melted using ultrasound using a sonotrode.
• the adhesive can be placed for example in a receptacle of the piston.
• the sensor element may already be placed on the sensor element, so that it is designed to be self-adhesive. It is particularly advantageous if the sensor element is a foil or a metal sheet.
• the senor element is connected by means of injection or encapsulation with the piston.
• the sensor element can be placed in an injection mold to be sprayed on or with the piston by injection molding. As a result, a simple production can be achieved.
• the senor element has holding means which engage in recesses of the piston. As a result, a positive connection can be achieved.
• the piston has holding means which at least partially surrounds or passes through the sensor element. For engaging or reaching through a recess or an opening may be provided, in which the holding means can engage.
• the holding means may have snap connection elements, which allow a secure positive connection.
• the sensor element may also be frictionally connected to the holding means.
• a holding means can be connected to the piston, which at least partially surrounds or passes through the sensor element.
• a holding means may, for example, a screw, a clamp, a rivet or the like. be.
• FIG. 1 a shows a schematic representation of a piston in side view
• Figure 1 b is a schematic representation of a piston in section according to
• Figure 1 c is a schematic representation of a piston in perspective
• Figure 1 d is a schematic representation of a sensor element
• Figure 1 e is a schematic representation of a sensor element
• Figure 2a is a schematic representation of a piston in side view
• Figure 2b is a schematic representation of a piston in section according to
• FIG. 2c shows a detail according to FIG. 2b, a schematic representation of a piston in a perspective view, a schematic representation of a piston in side view, a schematic representation of a piston in section along line AA of Figure 3a, a schematic representation of a piston in section along line BB of Figure 3b, a detail according to Figure 3c ,
• FIG. 8a a schematic representation of a piston in perspective view, a schematic representation of a piston in side view, a schematic representation of a Piston in perspective view, a schematic representation of a piston in section along the line AA of Figure 9a in a first process step, a detail according to Figure 9c, a schematic representation of a piston in section along line AA of Figure 9a in a further process step, a detail of Figure 9e, a schematic representation of a piston in side view, a schematic representation of a piston in section along line AA of Figure 10a, a schematic representation of a Piston in perspective view, a schematic representation of a piston in side view, a schematic representation of a piston in section along line AA of Figure 1 1 a, a detail of Figure 1 1 b, a schematic representation of a piston in perspective view, a schematic representation of a Piston in side view, a schematic representation of a piston in section along the line AA of Figure 12a, a schematic representation of a piston in a perspective view
• FIGS. 1 a to 13 b show exemplary embodiments of a piston with a sensor element, which will be described below.
• the piston is preferably a piston of a master cylinder or a slave cylinder, wherein the sensor element is a sensor element, which can be detected with an inductive sensor system, so that due to the inductive sensor system, the movement or the position of the piston in the cylinder can be detected.
• the sensor element is designed as a segment of a circle. This may mean that the sensor element is designed as a flat curved plate or as a bent wire element, which occupies about a segment of a circular arc by the bend.
• FIGS. 1 a to 1 e show a first exemplary embodiment of a piston 1 with a sensor element 2.
• the piston 1 has a substantially cylindrical wall 3, which is delimited on the front side by two opposite end faces 4, 5.
• the end face 5 serves with a recess 6 preferably the connection of the piston 1 with a piston rod, not shown, for the axial displacement of the piston 1 in a cylinder.
• the piston 1 further comprises projecting from the cylindrical wall 3 ring elements or areas 7, 8, which serve as guide surfaces.
• the seals for the piston 1 in the cylinder are not shown.
• the piston 1 further comprises a sensor element 2, which is formed in the embodiment of Figures 1 a to 1 e as a ring segment, wherein the ring segment has an angular range of less than 180 °.
• the sensor element 2 thus has an arcuate wall 9, at the end regions 10, 1 1 inwardly projecting hooks are formed.
• FIGS. 1 d and 1 e show sensor elements which, in the end regions 12, 13, have inwardly projecting hooks 14, 15 which, however, do not extend over the full width of the sensor element. are.
• the width of the hooks 14, 15 is approximately half the width of the sensor element, wherein the hooks are aligned in the center of the sensor element.
• the hooks are also formed approximately at half the width of the sensor element, wherein the hooks 16, 17 are mutually arranged at the opposite lateral end region.
• the hook-shaped end regions 10, 11 can engage in a respective recess 18 and connect the sensor element 2 with the piston 1 in a form-fitting manner by means of a snap connection.
• projections 19 are further provided with the cylindrical wall 3 of the piston 1, which serve as a stop for the sensor element 2, so that the sensor element 2 viewed in the axial direction of the piston 1 is not on the stop of the element 19 can move out.
• the sensor element 2 on the annular portion 7 side abut, so that it is fixed in this respect also in the axial direction.
• Figures 1 a to 1 e show an embodiment in which a sensor element 2 is designed as a ring segment, which can be arranged and secured by means of snap hooks on a wall of the piston 1.
• the piston 1 has recesses 18 which have undercuts, so that the end regions 10, 11 of the sensor element designed as hooks can undercut the edges of the recess 18. The sensor element 2 is thus pushed onto the piston 1 in the radial direction and secured thereto by means of a snap connection.
• Figures 2a to 2d show a further embodiment of a piston 21 which is formed substantially similar to the piston 1 of Figures 1 a to 1 c.
• the sensor element 22 is formed as a ring segment, wherein the angle occupied by the ring segment is greater than 180 ° but less than 360 °, so that the ring segment similar to a clamp around the cylindrical wall 23 of the piston 21st can be pushed, and due to its inherent elasticity, the piston 21 comprises a positive fit.
• projections 26 are arranged as ribs on the cylindrical wall, which extend in the axial direction and protrude from the wall 23. These projections or ribs 26 are arranged so that they face the end regions of the sensor element, so that a rotation of the sensor element against the stop of the projections 26 is prevented.
• Figures 3a to 3e show a further embodiment of a piston 31, on which a sensor element 32 is arranged and fixed.
• the sensor element 32 is in turn formed as a ring segment, which rests against the cylindrical wall 33 of the piston 31, wherein for preventing rotation ribs 34, 35 are provided which extend in the axial direction extended from the wall 33. If the sensor element 32 is placed on the wall 33, then the ribs 34, 35 are arranged adjacent in end regions 36, 37 of the sensor element and thus prevent as a stop the rotatability of the sensor element 32 on the wall.
• the annular region 38 has an undercut 39, so that the sensor element 32 can engage with an axial region 40 in the undercut 39.
• a snap hook 41 is arranged, which has a bevel 42, so that when the bevel 42 is acted upon by the sensor element 32, the snap hook laterally deflects until the sensor element can reach past the tip of the bevel, so that the snap hook 41 can snap back again and engage over the sensor element with a hook-like end region 43.
• the snap hook 41 is used in the embodiment of Figures 3a to 3e and the axial positioning of the sensor element 32, wherein the snap hook also positioned in the radial direction.
• a plurality of snap hooks may be provided.
• a piston 51 which has a pocket 54 for the arrangement of the sensor element 52 in its cylindrical wall 53, wherein for the radial support of the sensor element 52 within the pocket 54 webs 55 are provided which are spaced from each other are. Between the webs 55, the pockets 54 receiving areas for adhesive, so that the inserted into the pocket 54 sensor element 52 can be bonded to the piston 51.
• the cutout of the pocket 54 which is adapted in size substantially the size of the sensor element 52, so that the boundary of the pocket causes the positioning of the sensor element 52.
• the pocket 54 is dimensioned such that the adhesive can be well dosed into the pocket 54 and a defined adhesive gap is formed by the height of the webs 55 in the radial direction to receive the adhesive to the sensor element 52 well and permanently with the piston 51st to stick together. After curing of the adhesive, a displacement of the sensor element 52 is ideally no longer possible.
• FIG. 5a shows a piston 61 with a sensor element 62 which will be fastened to the cylindrical wall 63 of the piston 61.
• the sensor element 62 is bonded by means of adhesive 64, which is arranged on the inside of the sensor element with the wall 63 of the piston 61.
• adhesive 64 is arranged on the inside of the sensor element with the wall 63 of the piston 61.
• a liquid or pasty adhesive can be used.
• a self-adhesive film or adhesive spray can be used to provide the sensor element 62 with adhesive to adhere it to the piston 61.
• the sensor element may be a self-adhesive film, for example made of aluminum, which is glued directly onto the cylindrical wall 63 of the piston 61. It must be ensured during the positioning that the sensor element is applied in the correct position. This can be done, for example, that the sensor element is applied laterally to the stop 65 of the ring portion 66. Alternatively, pockets or protruding ribs may be used to position the sensor element 62.
• Figures 6a to 6d show a further embodiment of a piston 71, in which the sensor element 72 is encapsulated with the piston 71, wherein the sensor element 72 is positioned on the outside of the piston 71 and is not covered by the plastic material of the piston.
• the sensor element 72 protrudes radially at least slightly beyond the piston in order to be able to be held in the injection molding tool.
• the sensor element 72 is designed as a circular segment-shaped element which is arranged flush on the outer circumference of the cylindrical wall 73. In the event that the sensor element 72 projects at least slightly radially outward, a step would result in the transition from the cylindrical wall to the sensor element 72.
• FIGS. 7a to 7c show a further exemplary embodiment of the invention, in which the piston 81 is formed with a sensor element 82, wherein the sensor element is encapsulated by the piston, wherein a layer of plastic material 83 is also arranged above the sensor element 82, around the sensor element 82 to cover the outside. As a result, the sensor element 82 is held with a positive connection on the piston 81, whereby a secure positioning of the sensor element 82 is achieved.
• the plastic layer 83 may be a continuous closed plastic layer. Alternatively, at least one interruption or a plurality of interruptions in the plastic layer can be arranged in order to save material and, if necessary, also to be used for positioning the sensor element in the injection molding tool.
• FIGS. 8a to 8c show a further embodiment of a piston 91 to which a sensor element 92 is fastened.
• the sensor element 92 is designed as a circular-segment-shaped planar element which has a central opening 93.
• the sensor element is positioned on the piston so that the opening 93 is aligned with an opening 94 in the piston, so that a screw 95 can be screwed through the opening 93 in the opening 94.
• the opening 94 is a threaded bore, which may be formed continuously or formed as a blind hole.
• the screw is used to fix the sensor element, wherein the screw can also be used as a dowel screw to effect a defined positioning of the sensor element.
• ribs or webs can also be arranged on the circumference of the cylindrical wall 96 in order to carry out the positioning of the sensor element.
• the sensor element can also be applied to the ring element 97 in order to screw it defined there.
• Figures 9a to 9f show a further embodiment of the invention, wherein a piston 101 is provided with a cylindrical wall 103 on which a sensor element 102 is mounted.
• the piston has a cylindrical pin
• the pin 105 can pass through the sensor element. After arranging the sensor element 102 on the cylindrical wall 103 and the passage of the pin 104 through the opening 105, the pin is deformed at its outer end, so that it has outboard webs 106 and an outboard edge which engages over the edge 107 of the opening 105 , As a result, a positive connection between the piston and the sensor element is achieved.
• the piston 101 and also the pin 104 made of plastic material, so that the plastic material can be easily converted, for example by heat staking or wobble riveting.
• the opening 105 has at its edge region a step or a recess into which the rivet head produced by the deformation can be sunk.
• a rib or a web can furthermore be provided on the piston, it also being possible to apply the sensor element 102 to the ring element 108.
• pin 104 as a rivet element can be realized in such a way that only a single rivet element is provided. Alternatively, a plurality of rivet elements may be provided to secure the sensor element 102. The same applies to the embodiment of Figures 8a to 8c, in which in addition to a single screw and embodiments are possible in which a plurality of screws are used.
• the piston 1 1 1 for positioning and attachment of the sensor element 1 12 a pocket 1 13, which receives the sensor element.
• Quetschrippen 1 15 are arranged, which are squeezed when inserting the sensor element 1 12 to produce a positive connection by the pressing of the sensor element 1 12.
• the crush ribs 1 15 are formed as ribs which protrude into the pocket 1 13 at least slightly to 12 at the onset of the sensor element to be squeezed the edge region of the sensor element 1 12, so that thereby a fixation of the sensor element 1 12 is generated.
• Figures 1 1 a to 1 1 e show a further embodiment of the invention, in which a piston 121 is provided with a cylindrical wall 123, in which case the cylindrical wall 123 has a pin 124 which projects in the radial direction.
• the sensor element 122 to be connected to the piston has an opening 125 into which the pin 124 is received.
• the pin 124 is dimensioned so that the diameter of the pin 124 is slightly larger than the diameter of the opening 125, so that it comes to an oversize fit. If the sensor element 122 is pressed with the opening 125 on the pin 124, a consolidation of the sensor element is achieved on the piston.
• the defined positioning of the sensor element 122 can preferably take place via the arrangement of the pin 124, wherein alternatively or additionally ribs can be arranged on the circumference of the cylindrical wall in order to unambiguously define the position of the sensor element 122.
• the exemplary embodiment of FIGS. 11a to 11d in which only one pin 124 is provided, alternative embodiments can also be realized in which a plurality of pins 124 are provided, which engage in a plurality of openings of the sensor element 122.
• the sensor element 122 may also include a pin or a plurality of pins that may engage openings in the piston to provide an interference fit therewith to position the sensor element.
• Figures 12a to 12c show a further embodiment of the invention, in which a piston 131 is provided by means of a sensor element 132, wherein the Sensor element in turn is a substantially flat ring-segment-like element, so that the curvature of the substantially planar sensor element of the curvature of the cylindrical wall 133 of the piston substantially corresponds.
• the sensor element is placed on the piston and pressed and by heating the sensor element, the plastic of the piston 131 is melted, so that the sensor element can be connected to the piston.
• the piston 131 has a pocket-like recess 134, so that a clear positioning of the sensor element in the pocket-like recess 134 can be made.
• the surface of the piston 131 can be melted to ensure a connection between the piston 131 and the sensor element 132.
• ribs or nubs or the like may be provided in the attachment region of the piston 131, which may be melted when the sensor element 132 is heated in order to achieve the connection between the piston 131 and the sensor element 132.
• pockets are provided, into which also excess molten plastic material can flow, which assists the clear positioning of the sensor element 132, since thereby no excess amount of plastic material is accumulated between the piston 131 and the sensor element 132.
• Figures 13a and 13b show a further embodiment of the invention, in which a piston 141 is provided.
• the sensor element 142 is formed as a curved planar element as a ring segment, wherein the piston 141 has a cylindrical wall 145, so that the curvature of the sensor element 142 corresponds to the curvature of the cylindrical wall.
• the piston 141 further comprises two recesses 143 and 144 substantially opposite one another, wherein the sensor element 142 is placed on the cylindrical wall between the two recesses 143, 144.
• the edge regions 146, 147 of the sensor element 142 project beyond the cylindrical wall into this region and thus at least partially protrude beyond the boundary of the cylindrical wall in this respect and protrude into the recesses 143, 144.
• Verstennnntechnik Verstemnnung the respective edge region 146, 147 are transformed such that the edge region of the sensor element 142 adjacent to the edge of the cylindrical wall portion adjacent to the recesses 143, 144 form-fitting manner.
• ribs or webs 148 which serve to abut the sensor element 142, are provided for the axial positioning of the sensor element 142.
• the annular region 149 can also be used for positioning the sensor element.
• the respective sensor element is respectively connected to the respective piston.
• various embodiments above can be combined with each other to securely connect the sensor element to the piston.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Actuator (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=49303674

Family Applications (1)

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Citations (4)

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• 2013
  • 2013-08-09 DE DE112013004545.1T patent/DE112013004545A5/de not_active Withdrawn
  • 2013-08-09 IN IN1664DEN2015 patent/IN2015DN01664A/en unknown
  • 2013-08-09 WO PCT/DE2013/200114 patent/WO2014044263A1/de not_active Ceased
  • 2013-08-09 DE DE102013215774.6A patent/DE102013215774A1/de not_active Withdrawn
  • 2013-08-09 CN CN201380047140.8A patent/CN104662341B/zh not_active Expired - Fee Related

Patent Citations (4)

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