Compact steering assembly

Patent metadata

Field	Value
Publication number	US-11292515-B2
Application number	US-202016832447-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 27, 2020
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

A work vehicle includes a chassis defining a longitudinal axis, a prime mover configured to move the chassis in the direction of the longitudinal axis, and a steering assembly configured to pivot a wheel relative to the chassis. The steering assembly includes a knuckle coupled to the wheel, a tie rod coupled to the knuckle and having a ball portion, a steering cylinder, and a joint assembly. The steering cylinder is slidably coupled to the chassis and configured to translate relative to the chassis along a cylinder axis perpendicular to the longitudinal axis. The steering cylinder includes a connection portion having an inner circumferential surface that partially defines a bearing pocket. The joint assembly couples the ball portion to the connection portion and includes a bearing race that is received into the bearing pocket in direct contact with the inner circumferential surface. The bearing race receives the ball portion.

First claim

What is claimed is:

1. A work vehicle comprising:
a chassis defining a longitudinal axis;
a prime mover configured to move the chassis along a ground surface in the direction of the longitudinal axis; and
a steering assembly configured to pivot a wheel relative to the chassis about a steering axis, the steering assembly including
a knuckle coupled to the wheel,
a tie rod coupled to the knuckle and having a ball portion,
a Steering cylinder slidably coupled to the chassis and configured to translate relative to the chassis along a cylinder axis perpendicular to the longitudinal axis, the steering cylinder extending longitudinally between a first side and a second side, each of the first side and the second side including a connection portion having an inner circumferential surface that at least partially defines a bearing pocket, and
a joint assembly that couples the ball portion to at least one of the connection portions, the joint assembly including a bearing race that is received into the bearing pocket in direct contact with the inner circumferential surface, wherein the bearing race receives the ball portion, and
wherein each connection portion further comprises an internally threaded portion located adjacent the bearing pocket and configured to receive a retaining nut.

2. The work vehicle of claim 1 , wherein the bearing race comprises a first cup race and a second cup race, and wherein the ball portion is captured between the first and second cup races.

3. The work vehicle of claim 2 , wherein each connection portion further comprises a shoulder located adjacent the inner circumferential surface and further defining the bearing pocket, and wherein the first cup race contacts the shoulder.

4. The work vehicle of claim 3 , wherein the retaining nut is adjustable to increase a preload force exerted on the ball portion by the first and second cup races.

5. The work vehicle of claim 1 , wherein each connection portion comprises a seal pocket that receives a seal member.

6. The work vehicle of claim 1 , wherein each connection portion further comprises a shoulder that further defines the bearing pocket and locates the bearing race along the cylinder axis.

7. A steering subassembly comprising:
a steering cylinder positionable within a barrel of a chassis of a vehicle and configured to translate along an axis concentric with the barrel, the steering cylinder including a connection portion comprising a seal pocket, an internally threaded portion, and a bearing pocket located between the seal pocket and the internally threaded portion and at least partially defined by an inner circumferential surface;
a bearing race receivable into the bearing pocket in direct contact with the inner circumferential surface and configured to at least partially enclose a ball portion of a tie rod; and
a retaining nut received into the internally threaded portion, wherein the retaining nut is adjustable to increase a preload force exerted on the ball portion by the bearing race.

8. The steering subassembly of claim 7 , further comprising a seal member received into the seal pocket.

9. The steering subassembly of claim 7 , wherein the bearing race comprises a first cup race and a second cup race, and wherein the ball portion is captured between the first and second cup races.

10. The steering subassembly of claim 9 , wherein the connection portion further 9 comprises a shoulder located adjacent the inner circumferential surface and further defining the bearing pocket, and wherein the first cup race contacts the shoulder.

11. The steering subassembly of claim 10 , wherein the shoulder locates the first cup race along the axis.

12. A work vehicle comprising:
a chassis defining a longitudinal axis;
a prime mover configured to move the chassis along a ground surface in the direction of the longitudinal axis; and
a steering assembly configured to pivot a wheel relative to the chassis about a steering axis, the steering assembly including
a knuckle coupled to the wheel,
a tie rod coupled to the knuckle and having a ball portion,
a steering cylinder slidably coupled to the chassis and configured to translate relative to the chassis along a cylinder axis perpendicular to the longitudinal axis, the steering cylinder including a connection portion comprising a seal pocket, an internally threaded portion, and a bearing pocket defined by an inner circumferential surface and a shoulder of the connection portion,
a seal member received into the seal pocket,
first and second cup races received into the bearing pocket in direct contact with the inner circumferential surface, with the first cup race further in contact with the shoulder, wherein the ball portion is captured between the first and second cup races, and
a retaining nut received into the internally threaded portion;
wherein the retaining nut is adjustable to increase a preload force exerted on the ball portion by the first and second cup races.

13. The work vehicle of claim 12 , wherein the shoulder locates the first cup race along the cylinder axis.

14. The work vehicle of claim 12 , wherein the bearing pocket is located between the seal pocket and the internally threaded portion.

Assignees

• Deere & Co

Inventors

• Thoreson Curtis P

Classifications

• B62D3/02

  mechanical · CPC title

• B62D7/166 Primary

  substantially perpendicular, e.g. between tie-rod and steering knuckle · CPC title

• B62D7/18

  Steering knuckles; King pins · CPC title

• F16C11/069

  with at least one separate part to retain the ball member in the socket; Quick-release systems · CPC title

• F16C11/0647

  Special features relating to adjustment for wear or play; Wear indicators · CPC title