JP4955912B2 - Seal guide device - Google Patents

Description

  The present invention relates to a seal and guide device for sealing and guiding piston-like elements.

  Seal and guide devices are known in different configurations from the background art. Here, in general, the seal is arranged adjacent to the guide element. The seal and the guide element are arranged along the outer surface of the piston, for example, in a groove-like notch in the component. In this case, the sealing element is generally responsible for the sealing function, whereas the guide element serves for guiding the piston. However, this type of seal guide device has a leak that rises constantly over its lifetime. Furthermore, the guide gap between the piston and the guide element cannot be kept constant. In order to have additional safety against leaks, it is also desirable that the guide element as well as the seal provide an additional sealing function.

  The object of the present invention is to eliminate the drawbacks of the known devices as described above and to greatly improve the sealing and guiding effects of the sealing and guiding device.

  According to the configuration of the present invention that solves the above problems, a seal element that provides a seal along the outer surface of the piston element, and a guide function that is disposed along the outer surface of the piston element for the piston element. A guide element and a preload element that provides a predetermined preload force to the guide element in the axial direction are provided.

  The construction according to the invention has the advantage that the sealing action and the guiding action of the combined seal and guide device are significantly improved over the background art. Furthermore, the sealing and guiding device according to the invention allows a predetermined adjustment of the guide gap existing between the guide element and the piston element. This is achieved according to the invention by the integrated seal and guide device having a preload element which provides a predetermined preload or preload to the guide element in the axial direction. The predetermined adjustment of the guide gap enables a substantially constant guide gap over the entire length of the guide element in different operating conditions. This leads to a clear improvement of the guide characteristics compared to the background art, so that a particularly accurate guidance of the piston element is possible.

  Advantageous configurations of the invention are the subject of the dependent claims.

  A particularly precise compliance of the guide gap is achieved by the preload element advantageously having an axial preload region, which is arranged between the sealing element and the guide element. Is done. Particularly advantageously, the preload region is formed in an annular shape so that it can be applied to and engage with an axially oriented annular surface of the guide element. Thereby, an equal preloading action of the preloading element relative to the guide element can be achieved.

  In another advantageous configuration, the preload element has a first radial preload region for providing a radial force to the sealing element. In addition, this first radial preload region allows an additional predetermined radial force to be applied to the sealing element, so that an improved predetermined seal between the piston and the sealing element is possible.

  In another advantageous configuration, the preload element has a second radial preload area, which produces a radial force on the guide element. Thereby, according to the invention, a particularly precise and accurate adjustment of the guide gap between the guide element and the piston element can be achieved in combination with the force of the preload element acting axially on the guide element.

  In order to maintain the guide gap better and more constant during operation, the guide element is advantageously arranged in a stepped step of the housing or the like, with a second surface oriented in the axial direction. ing.

  In another advantageous configuration of the invention, the preload element advantageously has a second axial preload region, which second axial preload region is oriented axially of the guide element. Applied to the second surface. This makes it possible that the preload element can apply a predetermined force to both axial surfaces of the guide element, or more advantageously, the predetermined force is applied to three surfaces, i.e. both axial surfaces and a radius. It can be added to the guide element from the outer surface of the direction. Depending on the intended use, a certain force may be provided by the respective preloading area of the preloading element, or the individual areas of the preloading element may simply be used as a contact surface for the guide element without preloading action. May be useful.

  According to another advantageous configuration of the invention, the preload element is arranged in a stepped hole having two different diameters. This makes it particularly easy to provide the guide element and / or the sealing element with a preload force that is individually adjusted to the intended use.

  Advantageously, the preload element is made of spring steel. However, it is also conceivable to make the preload element from another material, for example plastic. The guide element is preferably made from polytetrafluoroethylene (Teflon).

  The seal guide device according to the invention can be used, for example, in a pump, for example for an antilock system, or especially when using another hydraulic pressure in the vehicle field.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  A first embodiment of the seal guide apparatus 1 according to the present invention will be described below with reference to FIG.

  The seal and guide device 1 has a seal element 2, a guide element 3 and a preload element 7. The sealing element 2 is made of an elastomer material and seals the piston 14 in an annular manner along its piston peripheral surface 15. At that time, during operation, the pressure P acts on the surface of the seal element 2 located in the axial direction XX (see FIG. 1). The piston 14 is disposed in the pump and reciprocates in the arrow direction R in the axial direction XX. The guide element 3 is also formed in a ring shape and is made of polytetrafluoroethylene (Teflon). Over the width B extending in the axial direction of the guide element 3, a guide gap 6 is formed between the guide element 3 and the piston 14 with a gap height H that is constantly maintained in the axial direction.

  The preload element or preload element 7 is made of spring steel and has an axial preload region 8, a first radial preload region 9, a second radial preload region 10 and a fixed region 11. Yes. The preload element 7 is inserted into the housing 13 in the fixed region 11 by press fitting. More precisely, a stepped hole having a first diameter D1 and a second diameter D2 is formed in the housing 13, and at this time, between the preload element 7 and the diameter D1 of the housing 13 in the fixing region 11 Thus, a metal seal is formed over a predetermined length. Depending on the application case, for example, a clearance fit can be formed between the second radial preload region 10 and the diameter D2 of the housing 13. Thereby, small movements of the guide element 3 directed radially outwards can be compensated elastically. An axial preload region 8 of the preload element 7 is arranged between the seal element 2 and the guide element 3 as shown in FIG. More precisely, the axial preload region 8 is annular and is applied to the first axial surface 4 of the guide element 3. Thereby, the preload region 8 in the axial direction can exert a preload force on the guide element 3 in the axial direction. At that time, the guide element 3 is applied to the step portion 12 formed in the housing 13 with the second axial surface 5 (see FIG. 1).

  Thereby, the preload element 7 can provide the guide element 3 with an axial force by the axial preload region 8 and a radial force by the second radial preload region 10. Thus, the gap 6 between the guide element 3 and the piston 14 can be constantly maintained during operation even under different operating conditions. Furthermore, the preload element 7 can simultaneously exert a radial preload force on the sealing element 2 by means of the first radial preload region 9. Thereby, the sealing properties of the integrated seal guide device can be further improved. Furthermore, an improved seal between the guide element 3 and the step 12 provided in the housing 13 due to the axial force acting by the axial preload region 8 also causes the guide element 3 to have a second axial direction. This is achieved along the plane 5.

  It should be noted that already in the assembled basic state, the axial preload region 8 exerts some preload on the guide element 3. During operation, the axial force acting on the guide element 3 can be further expanded by the presence of a high pressure P.

  The seal guide apparatus 1 according to the second embodiment will be described below with reference to FIG. At that time, the same reference numerals are assigned to the same parts as those in the first embodiment.

  The second embodiment substantially corresponds to the first embodiment. However, unlike the first embodiment, in the second embodiment, the preload element 7 additionally has a second axial preload region 16. As shown in FIG. 2, the second axial preload region 16 is arranged along the second axial surface 5 of the guide element 3 in the assembled state. Thereby, the guide element 3 is fastened between the first axial preload region 8 and the second axial preload region 16, in which case the preload force can act in both axial directions. it can. This makes it possible to maintain the gap height H of the gap 6 more accurately and constantly in various operating conditions. In other respects, this embodiment corresponds to the first embodiment and reference is made to the description given there.

  A seal guide apparatus 1 according to a third embodiment of the present invention will be described below with reference to FIG. Parts that are the same as or functionally the same as those of the first embodiment are also given the same reference numerals.

  Unlike both embodiments described above, the preload element 7 is no longer in a stepped hole, but in a hole having a constant diameter D1. Thereby, a particularly long sealing area can be realized between the fixing area 11 and the diameter D 1 of the housing 13. Thereby, the preload element 7 can only exert a radial preload force on the guide element 3 only in a limited way. Furthermore, the first radial preload region 9 is bent so as to extend directly along its inner surface adjacent to the fixing region 11 (see FIG. 3), thereby again limiting Only preferentially a radial preload force can be exerted on the sealing element 2. The seal and guide device 1 of the third embodiment has a particularly simple structure and can be manufactured at a particularly low cost. By providing an axial preload force by means of the axial preload region 8, the gap height H of the gap 6 can be kept constant in different operating conditions. In other respects, this embodiment corresponds to the previous embodiment, so please refer to the description provided there.

1 is a schematic cross-sectional view of a seal guide apparatus according to a first embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a seal guide apparatus according to a second embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a seal guide apparatus according to a third embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Seal and guide apparatus, 2 Seal element, 3 Guide element, 4 1st surface, 5 2nd surface, 6 Guide gap, 7 Preload element, 8 Axial preload area, 9 1st radial preload area , 10 second radial preload area, 11 fixed area, 12 steps, 13 housing, 14 piston element, 15 piston peripheral surface, 16 second axial preload area, B width, H gap height, P Pressure, R motion direction, XX axis direction

Claims (7)

A sealing and guiding device for sealing and guiding a piston element (14) contained in a bore, wherein the sealing element (2) provides a seal along the outer surface (15) of the piston element (14), and the piston element A guide element (3) arranged along the outer surface (15) of (14) and providing a guide function for the piston element (14), and a predetermined preload force in the axial direction (XX). A preload element (7) for providing to the element (3), the preload element (7) extending axially along the inner wall of the hole in the region of the sealing element (2) A fixing region (11) for fixing the element (7) in the hole, the fixing region (11) and the seal element; A first radial preload region (9) which provides a radial force to the sealing element (2) extending axially between (1) and the first radial preload region (9) annularly extending radially inward from, has a first axial preload region (8) and providing an axial force to the guide element (3), the preload of said first axial region (8), said being arranged between the sealing element (2) and the guide element (3), of the guide element (3), the first face (4 oriented in the axial direction ), And a seal guide device. The preload element (7) extends axially from said fixed region (11) between the inner wall and the guide elements of the hole (3), that provides a radial force to the guide element (3) and a second radial preload region (10), sealing guide apparatus according to claim 1. The guide element (3) is, with the second surface oriented in the axial direction (5), are arranged in a step-like step portion of the component (13) (12), according to claim 1 or 2 The seal guide apparatus as described. The preload element (7) has a second axial preload region (16) extending radially inward from the second radial preload region (10) , the second axial direction 3. The sealing and guiding device according to claim 2 , wherein the preload region (16) is applied to an axially oriented second surface (5) of the guide element (3). The hole is formed as a stepped hole having a first diameter (D1) and a second diameter (D2) , the preload element (7) being disposed in the stepped hole. The seal guide apparatus according to any one of 1 to 4 . The preload element (7) are fabricated from spring steel or plastic, sealing guide device according to any one of claims 1 to 5. The guide element (3) is made from polytetrafluoroethylene, sealing guide device according to any one of claims 1 to 6.

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