Abstract:
A seal for a fluid-fillable vessel of a gearing or motor is provided. The seal includes a first sealing body with a first inside sealing lip, with a first leg protruding from the sealing body, at the distal end of which there is arranged a second outer sealing lip which protrudes from the first leg. Reliable sealing can thus be achieved and apparent leakiness of a fluid vessel can be prevented at the same time.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to German Patent Application No. 102008024265.9, filed on May 20, 2008, and entitled “A Seal For A Vessel Filled With Fluid,” the disclosure of which is incorporated herein by reference in its entirety. 
     FIELD OF THE INVENTION 
     The present invention relates to a seal for a fluid-fillable vessel of a motor or a gearing and a fluid vessel with such a seal. 
     BACKGROUND OF THE INVENTION 
     When mounting a vessel that can be filled with a fluid or a cover such as a cylinder head cover or an oilpan made of metal or plastic, elastomeric seals are preferably used for sealing the individual components. The function of such a seal is not only separating the fluid from certain areas. In addition, such a seal should also bridge a gap which occurs between the components to be connected. Such a gap can be formed by inevitable production tolerances during the mounting process or by deformation as a result of thermal, mechanical or other influences during the use of a vessel, a cover or a trough. 
     When using fluid vessels it is inevitable that a sealing gap will occur between the components of such a fluid vessel to be connected, which gap reaches from the edge of the vessel to the seal and has a height of more than 0.1mm. This leads to the consequence that as a result of the capillary effect in the sealing gap a medium can penetrate the vessel from the outside. When such a sealing gap is inspected visually, the impression is given that the seal is perfect although the seal per se offers reliable sealing between the inside and outside space. Such an apparent tightness can hardly be distinguished from actual leakiness. 
     An additional problem can arise when a vessel filled with fluid is to be filled subsequently from the outside via a filling device or opening with the respective fluid. Depending on the position or the constructional configuration of this filling device or the opening it is inevitable that a residual quantity of the supplied fluid will reach the sealing gap during or after a filling process. Although the used seal will reliably seal the area from the inside of the vessel to the outside of the vessel, the impression might be given again due to the fluid present in the sealing gap that there is a leakage. Such an apparent leakiness leads to the consequence that efforts are made to remove the residual quantities of fluid from the sealing gap. This mostly occurs by complex and costly cleaning processes where it is acted upon the sealing gap from the outside. One example for such a cleaning process is cleaning by means of a high-pressure jet. 
     The problem of apparent leakiness can further occur when a vessel which is already filled with fluid and comprises components which are rigidly connected and sealed with each other is dismounted as a result of a maintenance measure. During such a dismounting process, residual quantities of the fluid reach a sealing groove and the adjacent outer flange area of the vessel. It is common practice that after the completed maintenance all components to be mounted again will be manually cleaned from residual quantities of the fluid. During the subsequent mounting of the components, these components are pressed tightly together with the seal, so that residual quantities of fluid are pressed out of the sealing groove. Despite a reliable sealing, the problem of apparent leakiness occurs again, so that laborious and mostly superfluous cleaning processes are performed. 
     SUMMARY OF THE INVENTION 
     Embodiments of the present invention provide a seal with which a reliable sealing of parts of a fluid vessel to be joined is achieved, with the apparent leakiness as described above no longer occurring during operation, after filling or after mounting of the fluid vessel. Other embodiments of the present invention provide a fluid vessel with such a seal. 
     In accordance with an embodiment of the present invention, a seal for a fluid-fillable vessel or a gearing or motor comprises a first sealing body for reliable sealing between the fluid vessel parts to be joined with a first inside sealing lip, with a first leg protruding outwardly from the sealing body, which leg can extend in the region of a sealing gap between the fluid vessel parts, at the distal end of which there is formed a second outer sealing lip which protrudes from the first leg and which enables sealing of the outer edge of the vessel parts, so that no fluid can penetrate the sealing gap from the outside, and medium disposed between the inside sealing lip and the outside sealing lip can move to the outside. 
     A reliable sealing between the fluid vessel parts to be connected is achieved by the first sealing body. A first leg protruding from the first sealing body can be arranged in such a way that it extends in the region of a sealing gap between the fluid vessel parts. The second outer sealing lip at the distal or outer end of the leg enables sealing of the outer edge of the vessel parts, so that no fluid can penetrate into a sealing gap from the outside. If fluid needs to be refilled into the vessel and residual quantities remain in a sealing gap, they no longer reach the outside as a result of the second outer sealing lip, so that the impression of apparent leakiness can no longer arise. Although residual quantities can be pressed into a sealing gap during the mounting of fluid vessel parts, they will no longer move to the outside because the second outer sealing lip will prevent any leaking of the fluid. As a result of the first leg protruding from the sealing body in combination with a second outer sealing lip protruding from the same, any apparent leakiness is reliably prevented. 
     Preferably, the first inside sealing lip and the second outer sealing lip are oriented in the same direction. In such an embodiment, a region is formed between the sealing lips which can hold residual quantities of fluid as in an intermediate storage. Any fluid stored there will thus neither enter the interior of the vessel nor will leave the vessel. No apparent leakiness can be assumed from the outside. 
     The first sealing body can also be arranged as a leg, so that the seal substantially has the shape of an L. The leg of the sealing body can be inserted well into a sealing groove, so that easier mounting of the seal in a part of the vessel is enabled. The leg of the sealing body and the first leg protruding from the same further enable a relatively large area in which fluid can collect as in an intermediate storage. The second outer sealing lip reliably prevents that fluid collected in an intermediate storage can reach the outside. 
     According to a further embodiment of the invention, a second sealing body protrudes from the first leg which connects the first sealing body and the second outer sealing lip with each other. Fluid which has collected between the first inside sealing lip and the second outer sealing lip as an intermediate storage can be prevented to flow along the circumference of the vessel. When several such second sealing bodies are provided, chambers can be formed which are delimited by a first sealing body, a second sealing body and a second sealing lip. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a cross-sectional view of a seal, in accordance with a first embodiment of the present invention; 
         FIG. 2  shows a cross-sectional view of a seal, in accordance with a second embodiment of the present invention; 
         FIG. 3  shows a cross-sectional view of a seal, in accordance with a third embodiment of the present invention; 
         FIG. 4  shows a cross-sectional view of a seal, in accordance with a fourth embodiment of the present invention; 
         FIG. 5  shows a cross-sectional view of a seal, in accordance with a fifth embodiment of the present invention; 
         FIG. 6  shows a perspective sectional view of the fourth embodiment of the seal; 
         FIG. 7  shows a top view of a part of the fourth embodiment of the seal; 
         FIG. 8  shows a sectional side view of a first embodiment of the fluid vessel; 
         FIG. 9  shows a sectional side view of a second embodiment of the fluid vessel; 
         FIG. 10  shows a perspective view of a seal, in accordance with a further embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a first embodiment of a seal  1  in accordance with the invention, comprising a first sealing body  2  and an associated sealing lip  3 . A first leg  4  protrudes from the sealing body  2 , with a second sealing lip  6  being provided at the distal end  5  of the first leg  4 . As is shown in  FIG. 1 , the sealing body  2  can have a round shape, or, as in the embodiment as shown in  FIG. 2 , a cornered shape as an extension of the first leg. It is further also possible that the first inside sealing lip  3  is arranged in a direction opposite of the second outer sealing lip  6 , as shown in  FIG. 3 . In this case, a groove for the first sealing lip  3  can be provided in an upper part of the vessel and an additional groove for the second sealing lip  6  in a bottom part of the vessel. 
     Principally, the seal in accordance with the invention can have any shape along the progression of its circumference, which shape is preferably adjusted to the shape of the fluid vessel to be sealed.  FIG. 10  shows an embodiment of the seal in accordance with the invention for a fluid vessel whose cross section is circular at least in the region to be sealed. 
     As is shown in  FIG. 4 , the first sealing body  2  can also be arranged as a leg  7 . This is advantageous because the leg  7  can be inserted easily into a groove and there is only a small likelihood that the seal  1  will slip during mounting. This also applies to the embodiment as shown in  FIG. 5 , with the first sealing body not only comprising a first inside sealing lip  3 , but also an additional sealing lip  31  which are opposite of each other. 
     In the case of circumferential sealing lips  3  and  6 , a region  9  is formed between these sealing lips in which fluid that is possibly present can be collected or stored, as shown in  FIG. 6  which shows a perspective view in a twisted representation of the fourth embodiment of the invention as shown in  FIG. 4 . In order to prevent that the fluid present in the region  9  can move laterally in an unhindered way, a boundary can be created with a second sealing body  8 . In the case of two second sealing bodies  8  which are arranged at a distance from each other, a chamber is formed which delimits any present fluid in region  9  to a relatively small zone. 
     The function of the seal in accordance with the invention in a fluid vessel is shown in greater clarity in  FIG. 8 . It shows a vessel  20  with bottom part  21  and upper part  22  of the vessel as well as a seal in accordance with the invention in the state when mounted between the two vessel parts  21 ,  22 . In order to prevent apparent leakiness, it is relevant in the seal in accordance with the invention that a second outer sealing lip  6  is provided at the end of the first leg  4  which prevents fluid from reaching the first inside sealing lip  3  from outside of a vessel (see reference numeral  28 ). This applies conversely in the same manner in that fluid is prevented by means of the second outer sealing lip  6  from reaching a region  28  outside of the vessel from the inside  26  of the vessel or the chamber  9 . 
     When the first inside sealing lip  3  is inserted in a groove  23  of a fluid vessel  20  in accordance with  FIG. 8  and is arranged adjacent to the inside side wall of the bottom part  21  of the vessel, the second outer sealing lip  6  can be arranged at the edge  29  of a flange  24  of the bottom part  21  of the vessel. No fluid can enter the interior  26  of the vessel from the outside region  28  as a result of the second outer sealing lip  6 . Any fluid supplied from the outside will collect at an outer edge  30  in the embodiment of the fluid vessel  20  as shown in  FIG. 8  and especially there at an edge  25 . It is able to drip off there, so that it is no longer located in the region of the sealing gap. Since the elastically arranged first leg  4  of the seal will protrude from the first sealing body  2  and the first leg  4  will provide sealing in the region of the separating plane  27  between the bottom part  21  and the upper part  22  of the vessel in the mounted state, no sealing gap will be formed in this region of the separating plane  27 . 
     When the upper part  22  and the seal  1  are mounted after maintenance, such that the parts are compressed, fluid residues in the groove  23  can collect in a chamber  9 . The second outer sealing lip  6  will prevent that this fluid will reach the outer region  28 , so that the impression of apparent leakiness is prevented. 
       FIG. 7  shows a top view of a seal  1  according to  FIG. 4 , with the seal  1  comprising several chambers  9 . In addition, a bore  10  is provided between the first inside sealing lip  3  and the outer second sealing lip  6 , through which a mounting screw  40  with a sleeve  41  can be pushed for example (see  FIG. 9 ). 
     The many features and advantages of the invention are apparent from the detailed specification, and, thus, it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and, accordingly, all suitable modifications and equivalents may be resorted to that fall within the scope of the invention