JP2006224840A - Sealing structure for operation tool guide groove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance air-tight property (dust-proofing/sound-proof property) of a cabin by enhancing sealing property of an elastically deformable foaming body used for closing a clearance (opening) of an operation tool linearly operated along a guide groove and the guide groove. <P>SOLUTION: By providing a restriction body 31 for restricting enlargement deformation to side surfaces N, N of the elastically deformable foaming bodies 27, 27 closely adhered onto an outer peripheral surface of a sub-shift lever 19, the close adhesion property of the foaming bodies 27, 27 to the sub-shift lever 19 is always retained and the close adhesion property of the foaming bodies 27, 27 opposed to each other is also enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal structure for an operation tool that is linearly operated along a guide groove, such as a main shift lever and an auxiliary shift lever of an agricultural tractor, and a gap (opening) between the guide groove.

Conventionally, a slash console installed in a driver's seat of an automobile is provided with an opening (guide groove) for a release lever that releases a passive belt that is a passive restraint device that does not require a mounting operation, for example. The release lever can be operated linearly. Then, in order to constantly close the gap between the opening and the release lever to improve the airtightness of the driver's seat, cut surfaces of the elastically deformable vinyl chloride sealing material made of outer skin and foam are provided on both side surfaces of the release lever. A configuration is known in which both sides are brought into close contact with each other and sealed using the elasticity of the sealing material (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 5-35897 (Page 2, Figure 3)

  However, in the above-described conventional one, when the linear operation of the release lever is repeated, the elasticity of the sealing material that always closes the gap between the release lever and the opening portion gradually decreases, and the cutting is performed. As a result, the cut surface at a specific operation position of the release lever is deformed and a significant gap is generated, and the airtightness (dustproof / soundproof) of the driver's seat is lowered.

  An object of the present invention is to solve the above-described problem, and for an operation tool that is linearly operated along the guide groove, an elasticity that closes the guide groove while being in close contact with the outer peripheral surface of the operation tool. In the sealing structure of the operation tool guide groove provided with the deformable foam, the first feature is that a restricting body for restricting the expansion deformation of the foam is provided on a side surface of the foam.

  The second feature is that the peripheral edge of the guide groove and the foam are attached only at the overlapping portion.

  According to the first aspect of the present invention, for an operating tool that is operated linearly along the guide groove, the operating tool is provided with an elastically deformable foam that closes the guide groove while closely contacting the outer peripheral surface of the operating tool. In the seal structure of the guide groove, by providing a restricting body for restricting the expansion and deformation of the foam on the side surface of the foam, the outer periphery of the operating tool can be obtained even if the linear operation of the operating tool is repeated. The expansion deformation to the side surface of the foam that is in close contact with the surface is regulated by the regulation body, whereby the adhesion of the foam to the operation tool is always maintained, and the adhesion between the opposed foams also deteriorates. Therefore, it is possible to solve the problem that the airtightness of the driver's seat, that is, the dustproof / soundproofness is lowered by the repeated operation of the conventional operation tool. In addition, at a specific operation position of the operation tool, that is, a normal operation position of the operation tool, it is difficult to cause a problem that the close contact surface of the foam is deformed and a significant gap is generated.

  And according to invention of Claim 2, the elastic deformation of the foam which sticks to the outer peripheral surface of an operation tool from both sides is affixed by sticking the periphery of the said guide groove and the foam only in the superposition | polymerization part. It is not hindered by unnecessary adhesion of the adhesive.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an agricultural tractor 10. The agricultural tractor 10 includes a motor unit including an engine and a radiator (not shown) at the front of an airframe 13 having left and right front wheels 11 and rear wheels 12. In addition to being disposed in a state of being covered with a hood 14, a cabin 16 is provided behind the driver's seat and surrounding a driver's control unit 15 including various operation levers and various switches.

  In the space between the driver's seat (not shown) and the left fender 17, as shown in FIG. 2, a main transmission lever 18 and an auxiliary transmission lever 19 which are transmission operating tools for airframe travel are provided, and a guide groove which will be described in detail later. Arranged so as to be linearly operable in the directions indicated by arrows A and B along the lines 24a and 24b.

  More specifically, the upper part of a hydraulic device such as a rotary valve that is rotated and operated in conjunction with the main transmission lever 18 by a seat frame 23 that is a lower component of the cabin 16 and supports the driver's seat, and a transmission case (not shown). The seat frame 23 is formed with elongated large holes 23a and 23b through which the base end portions of the main transmission lever 18 and the auxiliary transmission lever 19 are inserted, as shown in FIG.

  Further, on the upper surface of the seat frame 23, an intermediate guide plate 24 formed with longitudinal guide grooves 24a, 24b for the both speed change levers 18, 19 is attached using bolts 25,. Conventionally, elastically deformable foams 26, 26, 27, and 27 are attached to the upper surfaces of the grooves 24 a and 24 b so as to close the guide grooves 24 a and 24 b while being in close contact with the outer peripheral surfaces of the transmission levers 18 and 19. ing.

  That is, as illustrated in FIG. 4, elastically deformable foams 27, 27 that are in close contact with the outer peripheral surface of the auxiliary transmission lever 19 are attached to the upper surface of the guide groove 24 b of the intermediate guide plate 24, thereby A seal structure is configured to constantly close the gap (opening) between the lever 19 and the guide groove 24b to improve the airtightness (dustproof / soundproof) in the cabin 16.

  Further, above the intermediate guide plate 24, a lever guide 28 having a predetermined distance d from the seat frame 23 is attached to the cover body 23 using bolts 29,... The holding portions of the two speed change levers 18 and 19 are projected from the guide grooves 28a and 28b, and both speed changes are performed along the longitudinal guide grooves 24a and 24b of the intermediate guide plate 24 and the longitudinal guide grooves 28a and 28b of the lever guide 28. The levers 18 and 19 can be operated linearly.

  However, the foams 27 and 27 that always close and seal the gap between the auxiliary transmission lever 19 configured as described above and the guide groove 24b of the intermediate guide plate 24 are subjected to repeated linear operations of the auxiliary transmission lever 19. Then, the elasticity of the foams 27 and 27 gradually decreases, and the contact surfaces of the foams 27 and 27 expand and deform as illustrated in FIG. There was a problem that the intrusion of dust and the soundproofing performance deteriorated. In addition, when the clearance gap S generate | occur | produces in the contact | adherence surface of both the foams 27 and 27, the upper part of the side surfaces N and N will also be expanded and deformed like illustration.

  Therefore, in order to solve the above-described problem, the expansion deformation of the foam bodies 27 and 27 that are in close contact with the outer peripheral surface of the auxiliary transmission lever 19 to the side surfaces N and N in accordance with the linear repeated operation of the auxiliary transmission lever 19. As shown in FIGS. 5 and 6, a bending plate 31 having a U-shaped cross section is welded to the upper surface of the guide groove 24 b of the intermediate guide plate 24.

  More specifically, the U-shaped bending plate 31 includes a pair of left and right leg pieces 31a and 31a, and a long hole H1 having the same shape as the guide groove 24b of the intermediate guide plate 24 is provided in the body portion 31b. The bending plate 31 is welded to the upper surface of the intermediate guide plate 24 so that the guide groove 24b and the elongated hole H1 coincide with each other.

  Then, a sheet-like double-sided adhesive 32, which is an adhesive material obtained by trimming the long hole H2 having the same shape as the long hole H1, is pasted on the upper surface of the bending plate 31 while matching the long holes H1 and H2. Furthermore, foams 27 and 27 are stuck on the upper surface of the double-sided adhesive 32.

  That is, as described above, the bending plate 31 having a U-shaped cross section is used as a restricting body that restricts the expansion deformation of the foams 27 and 27 that are in close contact with the outer peripheral surface of the auxiliary transmission lever 19 to the side surfaces N and N. Even if the linear operation of the auxiliary transmission lever 19 is repeated, it is welded to the upper surface of the guide groove 24b of the intermediate guide plate 24, so that the auxiliary transmission is performed by the pair of left and right leg pieces 31a, 31a constituting the bending plate 31. The expansion deformation of the foams 27, 27 in close contact with the lever 19 to the side surface side is regulated by the regulation body, whereby the adhesion of the foams 27, 27 to the auxiliary transmission lever 19 is always maintained and opposed. Since the adhesiveness between the foams 27 and 27 does not deteriorate, the airtightness of the cabin 16 (driver's seat), that is, the dustproof / soundproofing property is achieved by the repeated operation of the auxiliary transmission lever 19 as in the prior art. You can solve the problems such as the under. In addition, at a specific operation position of the sub-transmission lever 19, that is, a normal operation position of the sub-transmission lever 19, it is difficult to cause a problem such that the contact surfaces of the foams 27 and 27 are deformed to generate a significant gap.

  Further, as shown in the cross-sectional view of FIG. 7, the sheet-shaped double-sided adhesive material 32 affixed to the upper surface of the bending plate 31 allows the peripheral edges E and E of the guide groove 24 b of the intermediate guide plate 24 and the foams 27 and 27. Since only the overlapping portion is adhered, the elastic deformation of the foams 27 and 27 that are in close contact with the outer peripheral surface of the auxiliary transmission lever 19 is not hindered by unnecessary adhesion of the double-sided adhesive 32 that is an adhesive.

  Incidentally, as shown in the cross-sectional views of FIG. 8A and FIG. 8B, in the configuration in which the double-sided adhesive materials 32 and 32 are attached to the entire attachment surfaces of the opposing foams 27 and 27, When the intermediate guide plate 24 is set in the direction of the arrow D in the drawing from above the assembled sub transmission lever 19, the double-sided adhesive materials 32, 32 facing each other are pushed upward by the grip portion F of the sub transmission lever 19, Furthermore, although the pushed-up part adheres and the foams 27 and 27 are deformed, there is a problem that the peripheral edges E and E of the guide groove 24b of the intermediate guide plate 24, as shown in the sectional view of FIG. By adhering only the overlapping portions with the foams 27 and 27, the above-mentioned problem can be solved.

The perspective view of the agricultural tractor. The sectional side view which shows the structure of a transmission lever. The perspective view which shows the structure of the guide groove seal structure of a transmission lever (conventional example). The perspective view which shows the malfunction of the guide groove seal structure of a subtransmission lever (conventional example). The perspective view which shows the structure of the guide groove seal structure of a subtransmission lever. The perspective view which shows the structure of the deformation | transformation control means of a foam. CC sectional drawing in FIG. Sectional drawing which shows the malfunction example of a foam sticking agent.

Explanation of symbols

19 Operation tool 24b Guide groove 27 Foam 31 Deformation restricting means E Edge N Side

Claims (2)

  For an operation tool (19) that is linearly operated along the guide groove (24b), an elastically deformable foam (27) that closes the guide groove (24b) while closely contacting the outer peripheral surface of the operation tool (19). 27), the restricting body (31) for restricting the expansion deformation of the foam (27, 27) is used as the side surface (N, 27) of the foam (27, 27). N) A seal structure for an operation tool guide groove, which is provided in N).   The seal structure for an operation tool guide groove according to claim 1, wherein the peripheral edge (E, E) of the guide groove (24b) and the foam (27, 27) are attached only at the overlapping portion. .

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