JP2006313396A - Seal structure of operation tool guide groove - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the sound insulating property of a driver's seat provided with a cabin by improving the sealing property of a seal means sealing the clearance between an operation tool linearly operated along a guide groove and the guide groove. <P>SOLUTION: In the seal structure of operation tool guide groove comprising the sealing means S sealing, for the operation tool 9 linearly operated along the guide groove 13a, the guide groove 13a while being closely in contact with the circumferential surface of the operation tool 9, the seal means S is composed of an elastic body 15 and elastically deformable foamed bodies 16 and 16 superposed on the elastic body 15 to enhance the sound insulating property of the driver's seat provided with the cabin. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

Conventionally, as an operation tool that is linearly operated along a guide groove, such as a main transmission lever or a sub-transmission lever disposed between a driver's seat of an agricultural tractor and a fender, for example, an operation tool is provided at a step. A guide groove to be penetrated is formed, and a plurality of switching position holes of the operation tool, and a rubber plate made of a mud-proof elastic body provided with a slit connecting these switching position holes are attached to the guide groove. By fixing the mud elastic body through the presser plate, the operation tool has a guide function and the switching operation position is clarified. Further, muddy water or the like below the machine body blows out from the guide groove to the upper surface of the step. What was comprised so that it might prevent was known (refer patent document 1).
Japanese Utility Model Publication No. 52-160930 (2nd page-4th page, Fig. 5)

  However, in the above-described conventional one, in order to clarify the switching operation position of the operation tool, among the plurality of switching position holes formed in the rubber-made mud-proof elastic plate, the switching position where the operation tool is not positioned. Since muddy water or the like below the fuselage may blow out from the hole to the upper surface of the step, there was a problem that the dustproofness to the driver's seat side could not be maintained sufficiently.

  The present invention has been made to solve the above-mentioned problems, and for an operation tool that is operated linearly along the guide groove, a sealing means that closes the guide groove while closely contacting the outer peripheral surface of the operation tool. A sealing structure for an operation tool guide groove, comprising: an elastic body and an elastically deformable foam layered on the elastic body.

  According to the present invention, the operation tool guide groove sealing means is composed of the elastic body and the elastically deformable foam layered on the elastic body, so that the linear operation of the operation tool is repeated. However, the sound insulation to the driver's seat side is maintained by the elastic body that is in close contact with the outer peripheral surface of the operation tool, and the dust-proof property on the driver's seat side is further improved by the elastically deformable foam layered on the elastic body. In particular, in an agricultural tractor equipped with a cabin, the airtightness of the driver's seat can be doubled.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an agricultural tractor 1. The agricultural tractor 1 includes a motor unit including an engine and a radiator (not shown) at the front of an airframe 4 having left and right front wheels 2 and rear wheels 3. In addition to being disposed in a state of being covered with a hood 5, a cabin 7 is provided behind the driver's seat and surrounding the driver's control unit 6 including various operation levers and various switches.

  In the space between the driver's seat (not shown) and the left fender 8, as shown in FIG. 2, a main speed change lever 9 and a sub speed change lever 10 which are travel speed change operating tools are provided, as will be described in detail later. , 13b are arranged so as to be linearly operable in the directions indicated by arrows A and B.

More specifically, a rotary valve of a traveling transmission that is rotated in conjunction with the main transmission lever 9 by a seat frame 12 that is a lower component of the cabin 7 and supports the driver's seat,
And the upper part of the transmission case (not shown) is covered, and the seat frame 12
As shown in FIG. 3, vertically long large holes 12a and 12b are formed through which the base end portions of the main transmission lever 9 and the sub transmission lever 10 are inserted.

  Further, on the upper surface of the seat frame 12, an intermediate guide plate 13 formed with longitudinal guide grooves 13a, 13b for the two speed change levers 9, 10 is attached using bolts 14,. Then, an elastic body 15 made of a rubber plate provided with a slit-like groove 15a that is in close contact with the outer peripheral surface of the plate 9a constituting the base end portion of the main transmission lever 9 is provided on the intermediate guide plate 13 so as to face the guide groove 13a. Further, on the elastic body 15, an elastically deformable foam 16, 16 such as a sponge, which is in close contact with the outer peripheral surface of the plate 9 a, is attached to the elastic body 15. A sealing means S for closing the guide groove 13a is configured.

  That is, as described above, the elastic body 15 made of rubber plate constituting the sealing means S is excellent in muddy water blocking properties and sound insulating properties, and the elastically deformable foams 16, 16 such as sponges are in close contact with the main transmission lever 9. In particular, in the agricultural tractor 1 equipped with the cabin 7, as shown in FIG. 4, the elastic body 15 prevents muddy water or the like below the machine body 4 from blowing out from the guide groove 13a. The operation sound of the working machine such as engine sound and tillage rotary is blocked so as not to enter the cabin 7, and further, the elastically deformable foams 16, 16 that are layered on the elastic body 15 are below the body 4. Intrusion of dust into the cabin 7 can be prevented, and the airtightness of the driver's seat can be doubled.

  Further, the auxiliary transmission lever 10 is formed by sticking elastically deformable foams 17, 17 such as sponges that are in close contact with the outer peripheral surface of the base end portion on the upper surface of the guide groove 12 b of the intermediate guide plate 13. The gap between the auxiliary transmission lever 10 and the guide groove 12b is always closed.

  Above the intermediate guide plate 13, a lever guide 18 having a predetermined distance d from the seat frame 12 is attached to the seat frame 12 using bolts 19,. The holding portions of the two speed change levers 9 and 10 are protruded from the guide grooves 18a and 18b of the intermediate guide plate 13 and along the longitudinal guide grooves 13a and 13b of the intermediate guide plate 13 and the longitudinal guide grooves 18a and 18b of the lever guide 18. The shift levers 9 and 10 can be operated linearly.

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 seal structure of the guide groove of a transmission lever. CC sectional drawing in FIG.

Explanation of symbols

9 Operation tool 13a Guide groove 15 Elastic body 16 Foam S Sealing means

Claims (1)

  For an operation tool (9) that is linearly operated along the guide groove (13a), an operation provided with a sealing means (S) that closes the guide groove (13a) while closely contacting the outer peripheral surface of the operation tool (9). It is a sealing structure of a tool guide groove, and the sealing means (S) is composed of an elastic body (15) and an elastically deformable foam (16, 16) that is overlaid on the elastic body (15). An operation tool guide groove seal structure characterized by the above.

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