A work machine includes a machine body, a motor provided in a rear portion of the machine body, a bonnet which covers a rear of the motor and which is openable, a tank disposed between the motor and the bonnet, and a support member. The support member includes a bracket supporting the tank on the bonnet such that the tank is separated from the bonnet.

A subframe structure includes an attachment bracket that is disposed between the second vibration-isolation device and rear cross member and that attach the second vibration-isolation device to the rear cross member, and four elastic bushings that floatably support the attachment bracket as to the rear cross member at four support points. A load input point where a load is input from an engine to the second vibration-isolation device is positioned within a region surrounded by the four support points in planar view.

A vibration isolator includes: a pair of opposing members fixed to a vehicle body of the vehicle to be located on both sides of a protrusion protruding from an outer circumferential edge of the power train in a direction perpendicular to the principal axes of inertia to oppose to each other in the direction about the principal axes of inertia; a precompressed part provided on part of each of the opposing members facing the protrusion to be precompressed by the opposing member and the protrusion in the direction about the principal axes of inertia; and a contacting part provided on part of each of the opposing members facing the protrusion to be spaced from the protrusion, and contacts the protrusion when the power train vibrates in the direction about the principal axes of inertia.

Provided is a head cover structure of an engine, which is capable of increasing supporting rigidity of a head cover. The engine includes a driving force transmission mechanism for transmitting a driving force of a crankshaft to a valve train, in which on one end side in a cylinder row direction of the head cover, a bulging portion for covering an upper side of the driving force transmission mechanism is provided, and an engine mounting portion is attached to the bulging portion. The bulging portion is provided with an inclined surface portion having an inclined surface inclined downwardly toward the other end side in the cylinder row direction, and the inclined surface is formed to rise upwardly from an intermediate position in the cylinder row direction so as to be continuous with a top surface of the bulging portion on the one end side in the cylinder row direction.

A subframe structure being supported by a vehicle-body frame and supporting a vehicular power plant through a damping device. The subframe structure includes: a longitudinal member which extends in a front-rear direction of a vehicle and is rigidly fixed to the vehicle-body frame; a lateral member which extends in a vehicle width direction and on which at least one of the damping devices is mounted; a floating mechanism which floatingly supports the lateral member on the longitudinal member through an elastic mechanism; and a suspension arm connected to the longitudinal member.

Provided is a head cover structure of an engine, which is capable of increasing supporting rigidity of a head cover. The engine includes a driving force transmission mechanism for transmitting a driving force of a crankshaft to a valve train, in which the head cover includes a bulging portion for covering an upper side of the driving force transmission mechanism on one end side thereof in a cylinder row direction, and an engine mounting portion is attached to the bulging portion. The bulging portion is provided with an inclined surface portion having an inclined surface inclined downwardly toward the other end side in the cylinder row direction, and the inclined surface is formed to rise upwardly from an intermediate position in the cylinder row direction so as to be continuous with a top surface of the bulging portion on the one end side in the cylinder row direction.

The present invention intends to allow a good layout of and an easy maintenance of parts disposed around a rear portion of the motor. A working machine includes a machine body; a motor mounted on the machine body; an output shaft protruding from a rear portion of the motor; a rear attachment portion disposed on the rear portion of the motor, the rear attachment portion facing backward; and a mount member configured to support the motor to suppress vibration of the motor, the mount member including: a first support member having an opposite attachment portion, the opposite attachment portion being attached opposite to the rear attachment portion; an elastic member attached to the first support member; and a second support member disposed on the machine body, the second support member being configured to support the elastic member.

A sub-frame structure includes right and left side members extending in a vehicle front-rear direction, and a rear cross member extending in a vehicle width direction. The sub-frame structure is configured to support a vehicle power plant such as an engine through antivibration devices, and to be supported by a vehicle body frame. The right and left side members are rigidly fixed to a vehicle body frame through bolts. A first antivibration device is mounted on a front cross beam. First bushes and second bushes are provided in order to support the front cross beam in a floating manner relative to the right and left side members.

A powertrain mount assembly configured to connect a powertrain to a side rail of a vehicle frame structure, wherein the powertrain mount assembly comprises: a mounting bracket comprising a first side wall and a second side wall spaced apart from the first side wall, the mounting bracket being configured to receive a resilient member and a bracket arm between the first and second side walls, the bracket arm being connectable to the powertrain; and a first support bracket connectable to a surface of the side rail, wherein the first side wall of the mounting bracket is fastenable to the first support bracket and wherein the first support bracket is configured to be connected to the side rail at a location between the first and second side walls of the mounting bracket.

Provided is a vibration damping device having a novel structure and that can have a greatly increased load strength resistance without a concomitant increase in the number of components or size at a stopper mechanism. The structure is such that first and second stopper portions having a hanging plate part and a dip part are provided to a pair of opposing sides of a stopper plate of a vibration damping device, whereas a pair of side plate portions extending between the first and second stopper portions are provided to the other pair of opposing sides of the stopper plate, and openings at both sides of the first and second stopper portions are closed by the pair of side plate portions.