受験番号：34IPM003

問１．
[0002]

Road markings such as white lines on the surface are typically used forindications to pedestrians and vehicle drivers traveling on the road.
[0003]

Patent Document 1 describes a road marking paint containing a synthetic resin

solution or dispersion and a filler. The paint is applied to a road surface and a
retroreflective material such as glass beads is distributed and allowed to dry to form apaint layer.

[0007]In road markings produced by applying road marking paints, such as thosedescribed in Patent Literatures 1-3, paint layers may be easily lost due to abrasion
caused by contact with pedestrians and vehicles. Therefore, periodic maintenance of themarking is necessary by sequentially applying a paint and a retroreflective material
such as glass beads. Long hours of traffic control are required for such maintenance,
and thus a method of road marking that requires less frequent maintenance has been
desired.
[0008]

Applying the road marking paint in a thicker layer may suppress loss of themarking despite contact with pedestrians or vehicles. However, a thick layer of roadmarking paint causes the force applied by contact with pedestrians and vehicles
increase particularly on the underside of the road marking, resulting in the roadmarking susceptible to loss by peeling off from the surface.

問２．
[0014]

According to the present embodiment, for backlash adjustment in the gear

train of the reduction gear device 10, the gear box 8 is provided with the reference
surface 8b as described above and the intermediate gear assembly 20 is disposed so as
to be slidably displaceable on the reference surface 8b before being fixed. Recesses 18
and 34, which will be described later, are formed approximately along the central axis at
the top of the input shaft 14 of the input gear assembly 10 and the top of theintermediate shaft 26 of the intermediate gear assembly 20.
[0015]

According to the present embodiment, a simple tool is used to adjust thebacklash in the gear train described above. As shown in Figures 2 to 4, this tool is a
restrictor 50 that fixes and restricts the distance L between the central axis of the input
shaft 14 of the input gear assembly 10 and the central axis of the intermediate shaft 26of the intermediate gear assembly 20. The restrictor 50 has a rod-shaped portion 52 andengaging pins 54 and 56 protruding from both ends of the rod-shaped portion 52. The
restrictor 50 is designed and formed such that the distance L between the centers of theengaging pins 54 and 56 with respect to the rod-shaped portion 52 is approximate thesum of the pitch circle radii of the input gear 16 and the first gear 22 of the intermediategear assembly 20. The distance between the gears 16 and 22 can be restricted byengaging the engaging pins 54 and 56 of the restrictor 50 into the recesses 18, 34 formedat the top of the input shaft 14 of the input gear assembly 10 and the top of theintermediate shaft 26 of the intermediate gear assembly 20. It would be obvious that asimilar restriction is achieved by forming pin-shaped protrusions corresponding to thepins 54 and 56 of the restrictor 50 at the tops of the input shaft 14 and the intermediate
shaft 26, while forming recesses 18 and 34 at both ends of the rod-shaped portion 52 of
the restrictor 50.

問３．
1.

A sealing device (A) comprising a first annular sealing plate (1), a second

annular sealing plate (2), and a sealing lip,the first annular sealing plate (1) and the second annular sealing plate (2) being
disposed in an annular space between a rotating-side inner member (11) and afixed-side outer member (12) and being attached respectively to a rotating-side inner
member (11) and a fixed-side outer member (12),each of the first annular sealing plate (1) and the second annular sealing plate (2)having an L-shaped cross section including a vertical plate section (1a, 2b) and acylindrical section (1b, 2b), with the cylindrical section (1b) fitted to the rotating-side
inner member (11) and the cylindrical section (2b) fitted to the fixed-side outer member(12), andthe first annular sealing plate (1) and the second annular sealing plate (2) facing eachother, wherein:
the first annular sealing plate (1) the vertical plate sections (1a, 2a) are disposed on theouter side in the axial direction;
the tips of the vertical plate portions (1a, 2a) and the cylindrical section of the second
sealing plate (2) face each other with a radial gap therebetween;
the second sealing plate (2) has a side lip (3a) and radial lips (3b, 3c);the side lip (3a) slidably contacts a planar inner surface of the vertical plate section (1a)of the first sealing plate (1), and has a tip inclined in a radially outward direction;
the radial lips (3b, 3c) slidably contact the cylindrical section (2b) of the first sealingplate (1);the first sealing plate (1) is a magnetic steel plate; andan elastomer with magnetic powder is vulcanized and adhered to the outercircumferential surfaces of the vertical plate portions (1a, 2a) with magnetic poles
alternately arranged.