Methods and systems are provided for a steering axle assembly. In one example, a system may include a tapered pin coupled to a steering knuckle and to an axle beam end. A set of bushings may circumferentially surround the tapered pin and enable rotation of the steering knuckle around the tapered pin without lubricant.

A vehicle includes a chassis and a front axle assembly coupled to a front end of the chassis. The chassis includes a first frame rail and a second frame rail. The first frame rail defines a first vertical plane. The second frame rail is spaced from the first frame rail and defines a second vertical plane. The front axle assembly includes a solid axle and a steering assembly. The steering assembly includes a pair of wheel hubs, a steering gear mechanism, and a linkage assembly. The pair of wheel hubs are coupled to opposing ends of the solid axle. The pair of wheel hubs are configured to facilitate coupling wheels to the front axle assembly. The steering gear mechanism is positioned between the first vertical plane and the second vertical plane. The linkage assembly couples the steering gear mechanism to the pair of wheel hubs.

The present invention is an improved version of the steering system described in U.S. patent application Ser. No. 17/115,573. The prior steering system features effortless steering input from the driver and negligible bumpsteer during suspension operation. Such extraordinary steering performance is realized with the use of costly and complex electric assist devices and control devices. The present steering system includes an alternative electric assist device which allows for the removal of the costly and complex electric assist devices in the prior steering system. The present steering system also includes a novel hydraulic control valve with a solenoid valve-plunger mechanism. The mechanism prevents premature wear or destruction of the rack and pinion gearset. The use of the alternative electric assist device and hydraulic control valve enables the present steering system to preserve the extraordinary steering performance featured in the prior steering system concurrent with a reduction in cost and complexity.

An electric power steering apparatus includes left and right swing arm members, right and left tie rods pivotally connected at inner ends to arm portions of the swing arm members via a relay rod pivotally connected to the arm portions at both ends, a rack-and-pinion device in which one end of a rack bar is connected to the arm portion of one of the swing arm members, and a steering input transmission system that transmits a steering input to the rack-and-pinion device. An electric steering assist force applying device is connected to the arm portion of the other swing arm member, and applies a force to assist the other swing arm member to swing.

To provide a steering device capable of highly precisely controlling turning angles of steered wheels without changing a layout of members. Provided is a steering device (10A) including: a center arm (26) having one end portion configured to swing in a right-and-left direction with respect to a vehicle body (BD) in synchronism with rotation of a steering shaft (22); a rod member (40A), which is coupled to the one end of the center arm (26), and is configured to move in the right-and-left direction, to thereby change turning angles of steered wheels (WR and WL); and a rod-member drive device (50) configured to linearly move the rod member (40A) in the right-and-left direction through use of a driving force source. The rod member (40A) is supported such that movement of the rod member (40A) in the right-and-left direction of the vehicle body (BD) is allowed, but movement of the rod member (40A) in a front-and-rear direction and an up-and-down direction of the vehicle body (BD) is restricted. The one end portion the center arm (26) and the rod member (40A) are coupled so as to be relatively movable in the front-and-rear direction of the vehicle body (BD).

To provide a steering device capable of highly precisely controlling turning angles of steered wheels without changing a layout of members. Provided is a steering device (10A) including: a center arm (26) having one end portion configured to swing in a right-and-left direction with respect to a vehicle body (BD) in synchronism with rotation of a steering shaft (22); a rod member (40A), which is coupled to the one end of the center arm (26), and is configured to move in the right-and-left direction, to thereby change turning angles of steered wheels (WR and WL); and a rod-member drive device (50) configured to linearly move the rod member (40A) in the right-and-left direction through use of a driving force source. The rod member (40A) is supported such that movement of the rod member (40A) in the right-and-left direction of the vehicle body (BD) is allowed, but movement of the rod member (40A) in a front-and-rear direction and an up-and-down direction of the vehicle body (BD) is restricted. The one end portion the center arm (26) and the rod member (40A) are coupled so as to be relatively movable in the front-and-rear direction of the vehicle body (BD).

A wheel suspension includes an axle limb which supports a wheel. The axle limb includes a first steering axle which provides a first steering angle in a specified range for the wheel, and components for connecting the axle limb to a support structure. At least one of the components includes a second steering axle which provides a second steering angle which is different than the first steering angle provided by the first steering axle. The second steering axle is selectively releasable. The components for connecting the axle limb to the support structure form a double transverse link axle which includes an upper traverse link and a lower traverse link. A support tube is arranged at a chassis-side end portion of each of the upper traverse link and the lower traverse link of the double transverse link axle. The support tube is pivotable about the second steering axle.

A wheel suspension includes an axle limb which supports a wheel. The axle limb includes a first steering axle which provides a first steering angle in a specified range for the wheel, and components for connecting the axle limb to a support structure. At least one of the components includes a second steering axle which provides a second steering angle which is different than the first steering angle provided by the first steering axle. The second steering axle is selectively releasable. The components for connecting the axle limb to the support structure form a double transverse link axle which includes an upper traverse link and a lower traverse link. A support tube is arranged at a chassis-side end portion of each of the upper traverse link and the lower traverse link of the double transverse link axle. The support tube is pivotable about the second steering axle.

A middle mounted implement tractor utilizes a movable frame design in order to provide for middle mounting of implements on a tractor that can drive up to the implement, raise its front portion in the air, drive forward over the implement, and then lower the front portion to the ground and attach the middle mounted implement. This is accomplished utilizing a front frame assembly pivotably connected to a mounting frame assembly which mounts the implement; a frame mover mechanism that lifts the front frame and mounting frame; a middle frame which connects the cab, frame mover mechanism and related components; and a rear frame which attaches rear wheels, caster wheels, engine, etc. The front wheels can turn one hundred and eighty degrees and the tractor can easily interchange consumables via a carriage system that allows simple loading and unloading of tanks, etc.

To provide a steering device capable of highly precisely controlling turning angles of steered wheels without changing a layout of members. Provided is a steering device (10A) including: a center arm (26) having one end portion configured to swing in a right-and-left direction with respect to a vehicle body (BD) in synchronism with rotation of a steering shaft (22); a rod member (40A), which is coupled to the one end of the center arm (26), and is configured to move in the right-and-left direction, to thereby change turning angles of steered wheels (WR and WL); and a rod-member drive device (50) configured to linearly move the rod member (40A) in the right-and-left direction through use of a driving force source. The rod member (40A) is supported such that movement of the rod member (40A) in the right-and-left direction of the vehicle body (BD) is allowed, but movement of the rod member (40A) in a front-and-rear direction and an up-and-down direction of the vehicle body (BD) is restricted. The one end portion the center arm (26) and the rod member (40A) are coupled so as to be relatively movable in the front-and-rear direction of the vehicle body (BD).