受験番号：34IPM014

問1[0002]
Pedestrians and vehicle drivers on roads receive road information usually fromroad markings such as white lines on the road surface.
[0003]
PTL 1, for example, discloses as a paint for such road markings a road marking
paint containing a synthetic resin solution or dispersion and a filler. The road marking
paint is applied to a road surface, followed by spraying a retroreflective agent such as
glass beads onto the road surface and drying the paint, to form a coating.
...
[0007]
Road markings formed by applying a road marking paint such as those
disclosed in PTLs 1 to 3 are easily worn off through contact with pedestrians andvehicles, causing the coating of the road marking paint to be lost. This necessitates
regularly applying the retroreflective agent (such as glass beads) and the road marking
paint on the existing coating to maintain road markings. Such maintenance requires anextended time period of traffic regulation thereafter. There has thus been a demand fora technique for road markings that need maintenance less frequently.
[0008]
A road marking paint may be applied to form a thicker coating so that roadmarkings are less likely to be lost through contact with pedestrians and vehicles. In
such a case, however, road markings, in particular their lower portions, receive a larger
force through contact with pedestrians and vehicles, making it more likely that roadmarkings come off from the road surface to be lost.
問2[0014]The present invention is arranged such that for adjustment of backlash in thegear train of the reduction gear device 10, the gear box 8 has a reference surface 8b on
which the intermediate gear assembly 20 can be slid before fixation as described above
and that the input and intermediate shafts 14 and 26 of the input gear assembly 10 and
the intermediate gear assembly 20 have, at respective top portions, respective recesses
18 and 34 described later that recede substantially along the respective axes.
[0015]

The present invention uses a simple jig for adjustment of backlash in the above
gear train. The jig is, as illustrated in FIGs. 2 to 4, a restricting jig 50 that fixes thedistance L between the central axis of the input shaft 14 of the input gear assembly 10and the central axis of the intermediate shaft 26 of the intermediate gear assembly 20.
The restricting jig 50 includes a bar-shaped portion 52 and engagement pins 54 and 56
protruding from the opposite ends of the bar-shaped portion 52. The restricting jig 50 isdesigned and shaped such that the engagement pins 54 and 56 on the bar-shaped
portion 52 have respective centers separated from each other by a distance L
substantially equal to the sum of the respective pitch radiuses of the input gear 16 andthe first-stage gear 22 of the intermediate gear assembly 20. Engaging the engagement
pins 54 and 56 of the restricting jig 50 with the respective recesses 18 and 34, describedabove as receding at the respective top portions of the input and intermediate shafts 14
and 26 of the input gear assembly 10 and the intermediate gear assembly 20, allows thedistance between the two gears 16 and 22 to be fixed. As will be obviously understood, asimilar restricting effect is achieved if the input shaft 14 and the intermediate shaft 26
have respective tips provided with respective pin-shaped protrusions equivalent to thepins 54 and 56 of the restricting jig 50, whereas the bar-shaped portion 52 of therestricting jig 50 have, at opposite ends, recesses equivalent to the recesses 18 and 34.
問3
Claim 1
A sealing device (A), comprising, in an annular space between a rotation-side
inner member (11) and a fixed-side outer member (12):a first sealing plate (1) having an annular shape and attached to therotation-side inner member (11);a second sealing plate (2) having an annular shape and attached to thefixed-side outer member (12); anda sealing lip unit (3),the first sealing plate (1) including a standing plate portion (1a) and a cylinder
portion (1b) fitted on the rotation-side inner member (11) to have an L-shaped crosssection,
the second sealing plate (2) including a standing plate portion (2a) and acylinder portion (2b) fitted on the fixed-side outer member (12) to have an L-shaped
cross section,
the first and second sealing plates (1, 2) facing each other,
the standing plate portion (1a) of the first sealing plate (1) being on an axiallyouter side and having a tip that faces the cylinder portion (2b) of the second sealing
plate (2) and that is separated from the cylinder portion (2b) of the second sealing plate(2) by a gap in a radial direction,
the sealing lip unit (3) being in contact with the second sealing plate (2) andincluding a side lip (3a) and radial lips (3b, 3c), the side lip (3a) being slidably in contact
with a flat inner side surface of the standing plate portion (1a) of the first sealing plate(1) and inclined radially outward increasingly toward a tip of the side lip (3a), the radiallips (3b, 3c) being slidably in contact with the cylinder portion (1b) of the first sealing
plate (1),the first sealing plate (1) being in a form of a magnetic steel sheet,the standing plate portion (1a) of the first sealing plate (1) having an outer sidesurface to which an elastomer containing magnetic powder is bonded throughvulcanization in a circumferential pattern and on which magnetic poles are disposed
alternately.
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