受験番号：30IPM017

問１．
As illustrated in FIGS. 7 and 8, a conventional squid fishingdevice includes: a winding drum B secured to a vessel body A
in parallel with a side of the vessel; a flippable squid landing
bay C extending from the position of the winding drum B outwardlyof the side of the vessel; and a guide roller D, called a tiproller, attached to an end of the squid landing bay C. A fishingline F with a weight E on the end thereof is routed from thewinding drum B on the guide roller D into the sea. When thewinding drum B is operated by a drive motor to wind up the fishingline F, a squid caught on a fishhook attached to the fishingline F is allowed to drop onto the squid landing bay C while
passing from the guide roller D to the winding drum B. In thistype of squid fishing device, squids that have been caught falland land on the squid landing bay C spontaneously due to theirweight while the fishhooks move from the guide roller D to thewinding drum B. This proves to be advantageous in that plentiful
manpower is not required for landing squids, workers canconcentrate their efforts to the operation and monitoring ofmachinery and the processing of squids, and the operation canbe performed efficiently with a relatively small number ofworkers.
[0003]
Technical Problem
In conventional squid fishing devices as described above,
winding drums are placed in line along a side of a vessel bodyand thus the number of winding drums is limited by the lengthof the side of the vessel body. This means that the number ofsquid fishing devices installable in a vessel is inevitably
limited by the size of the vessel body. Moreover, inconventional squid fishing devices, the number of winding drums
that can be installed for one squid landing bay is also limited,which is normally one, or two at best. Furthermore, each winding
drum of a conventional squid fishing device is placed on thedeck of a vessel and this may pose risks of serious accidents
to workers during operation. There have been reports of workers
caught in a rotating drum during operation and fatalities due
to weights on a fishing line flying and hitting workers whilebeing wound.
問２．
[0014]
A driving force/axial force/motor torque calculation unit 41
calculates an axial force, driving force, and motor torque froma load, shaft diameter, friction coefficient, and pressure
angle stored in the load/shaft diameter/friction coefficientstorage unit 21 and a gear position and gear size stored in thegear position/size storage unit 22. A principle of thecalculation is described below with reference to FIG. 2.
[0015]In FIG. 2, Gn denotes a gear of interest, Gn-1 denotes a drive
gear of Gn, and Gn+1 denotes a load gear of Gn. Gn receives adriving force Tn-1 from Gn-1 in a direction of a pressure angle
α with respect to a tangent line, and receives -Tn+1, a reaction
force from giving a driving force Tn+1, from Gn+1 in a directionof pressure angle α with respect to a tangent line.
[0016]
Gn then gives an axial force An, which is a resultant force ofthe two forces, to a shaft Sn. Gn and Sn produces friction due
to An while Gn is rotated, causing Gn to receive a friction force
Rn, which is the product of An and the friction coefficient.
This means that rotating Gn requires a torque value obtainedby adding together a torque for driving the load and a torqueloss due to this friction force, i.e., the product of the radiusof the shaft and the friction force. Accordingly, a driving
force is calculated for each gear by adding together the load
and the friction loss, in the order from a gear to which a load
is applied to the motor gear. Then, in the end, the required
motor torque is obtained.

問３．
1.
A manufacturing method for a floor of a trailer (1), themethod comprising:an inner floor unit forming step of forming an inner floor
unit (70) by arranging a plurality of floor members (30) in avehicle width direction and joining the floor members (30) bywelding, the floor members (30) each extending in a vehicle
length direction;a temporary floor unit forming step of forming a temporary
floor unit (71) by temporarily attaching end floor members (37)to both outer sides in a width direction of the inner floor unit(70);a width dimension adjusting step of placing the temporary
floor unit (71) between a pair of guide walls (75) spaced apartfrom each other and securing each of the end floor members (37)to a corresponding one of the guide walls (75) while width
dimensions are adjusted; anda welding step of joining the inner floor unit (70) to
the end floor members (37) by welding,wherein the inner floor unit (70) includes width
adjusting plates (50) at both ends in the width direction of
the inner floor unit (70), the width adjusting plates (50) each
including an adjusting margin in a floor width direction,
the end floor members (37) each includes a coupling plate(55) configured to be joined to a corresponding one of the width
adjusting plates (50) by welding, andin the temporary floor unit forming step, the end floor
members (37) are temporarily attached to the inner floor unit(70) with the width adjusting plate (50) and the coupling plate(55) overlapping with each other.