受験番号：30IPM011

問１A traditional squid-fishing apparatus is structured as described below with reference toFIG. 7 and FIG. 8. Namely, a hoisting drum B is fixedly installed on a vessel A inparallel to a side of the vessel A. From the position where the hoisting drum B isinstalled, a flip-up type squid landing bay C is installed towards outside the side of thevessel A. To a distal end of the squid landing bay C, a guide roller D called a tip roller isattached. A fishing line F with a weight E attached to its tip is drawn from the hoisting
drum B to the guide roller D and suspended into the sea from the guide roller D. Whenthe hoisting drum B is driven by a drive motor to wind up the fishing line F, a squidcaught on a fishhook attached to the fishing line F falls on to the squid landing bay C
while the squid is transferred between the guide roller D and the hoisting drum B. In
such a squid-fishing apparatus, the squid caught spontaneously falls on to the squid
landing bay C due to the weight of the squid itself, while the fishhook travels between
the guide roller D and the hoisting drum B. Therefore, the apparatus is advantageous inthat, for example, fishing itself does not require human resources and the humanresources can be dedicated for monitoring machine operations and post-processing
caught squids, thus enabling efficient work with fewer people.
[0003]
Problems to be Solved by the Invention
In the above-described apparatus for fishing squids, however, a hoisting drum isarranged side by side along the side of the vessel. Therefore, the number of hoistingdrums that can be installed is limited by the length of the side of the vessel, and thenumber of squid-fishing apparatuses that can be installed have been limited by the sizeof the vessel. To add this, in the traditional squid-fishing apparatus, the number ofhoisting drums that can be installed is one, or two at the most, for one squid landing bay.
Further, in the conventional squid-fishing apparatus, the hoisting drum is installed on
the deck. This causes a risk of a severe accident during operation. To date, there havebeen reported cases of an operator being caught by the rotating drum during operationor hit and killed by the weight on the fishing line, having jumped in while the fishingline is wound up.
問２[0014] Reference numeral 41 denotes a drive force/axial force/motor torque calculation
unit which obtains an axial force, a drive force, and a motor torque from a load, a shaft

diameter,africtionalcoefficient,andapressure

angle

storedinaload/shaft-diameter/frictional-coefficient storage unit 21, and a gear position and a gear
size stored in a gear-position/gear-size storage unit 22. The principle of calculation will
be described with reference to FIG. 2.
[0015] In FIG. 2, Gn is a gear currently concerned, Gn – 1 is a gear on a drive side of Gn,and Gn + 1 is a gear on a load side of Gn. Gn receives a drive force Tn – 1 from Gn – 1 ina direction of a pressure angle α with respect to the tangent line, and receives –Tn + 1from Gn + 1 as a reaction force for applying the drive force Tn + 1 in the direction of apressure angle α with respect to the tangent line.
[0016] Then, a resultant force of these two forces is applied from Gn to the shaft Sn as
an axial force An. When An rotates Gn, Gn generates friction with Sn, and Gn receives africtional force Rn which is a product of An and a frictional coefficient. Therefore, todrive Gn, a torque loss due to the frictional force, that is, a value including the productof the shaft radius and the frictional force is required, in addition to the torque fordriving the load. In view of this, a drive force is obtained for each of the gears,
sequentially from the gear on which a load is applied to the motor gear, the drive force
being obtained by adding the load and the friction loss. This way, a motor torquerequired at the end is obtained.
問３[Claim 1]
A method for producing a floor of a trailer (1), comprising:an inner floor unit formation step of forming an inner floor unit (70) byconnecting and weld-joining, in a vehicle-width direction, a plurality of floor
constituting members (30) extended in a vehicle-length direction;a temporarily assembled floor unit formation step of forming a temporarily
assembled floor unit (71) by temporarily assembling end-part floor constituting
members (37) on both width-directionally outward ends of the inner floor unit (70),respectively;
a width-dimension adjustment step of arranging the temporarily-assembled
floor unit (71) between a pair of guide walls (75) arranged and spaced from each other,and fixing the end-part floor constituting members (37) to the guide walls (75) while
adjusting a width dimension; anda welding step of joining the inner floor unit (70) and the end-part floor
constituting members (37) by welding,wherein the inner floor unit (70) has, on both of its width-directional ends, awidth adjustment plate (50) having an extra portion for adjustment of the floor in thewidth-direction and the end-part floor constituting members (37) each has a joint plate(55) to be weld-joined to the width adjustment plate (50), andwherein, in the temporarily assembled floor unit formation step, the inner floor
unit (70) and the end-part floor constituting members (37) are temporarily assembled,
while the width adjustment plate (50) and the joint plate (55) are overlapped.