Vehicle

Patent metadata

Field	Value
Publication number	US-12024259-B2
Application number	US-202318104319-A
Country	US
Kind code	B2
Filing date	Feb 1, 2023
Priority date	Feb 2, 2022
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A vehicle includes a front differential, a pair of constant-velocity joints, and a steering mechanism. The steering mechanism includes a pitman arm, a pair of tie rods, a pair of first link arms each connecting the pitman arm with a corresponding one of the pair of tie rods, and a pair of second link arms each connecting a corresponding one of the pair of first link arms with a body frame. In a plan view, at least a portion of each constant-velocity joint is located between first and second straight lines extending in a fore-aft direction and through first and second connectors extending between the tie rods and the first link arms. The first connector, the second connector, and at least a portion of each constant-velocity joint are located between third and fourth straight lines extending between the first and second link arms.

First claim

What is claimed is:

1. A vehicle comprising:
a body frame;
a prime mover supported by the body frame;
a pair of front wheels;
a front differential to receive power from the prime mover;
a pair of constant-velocity joints provided respectively on a left side and a right side of the front differential;
a pair of shafts each provided between a corresponding one of the pair of constant-velocity joints and a corresponding one of the pair of front wheels in order to transmit power from the front differential to the pair of front wheels via the pair of constant-velocity joints;
a pair of upper arms supported pivotably by the body frame;
a pair of lower arms each located lower than a corresponding one of the pair of upper arms and supported pivotably by the body frame;
a pair of knuckle arms each connecting a corresponding one of the pair of upper arms and a corresponding one of the pair of lower arms to rotatably support a corresponding one of the pair of shafts; and
a steering mechanism to steer the pair of front wheels; wherein
the steering mechanism includes a steering shaft, a pitman arm at a lower end portion of the steering shaft, a pair of tie rods each connected with a corresponding one of the pair of knuckle arms, a pair of first link arms each connecting the pitman arm with a corresponding one of the pair of tie rods, and a pair of second link arms each connecting a corresponding one of the pair of first link arms with the body frame;
a first connector extends between one of the pair of tie rods and a corresponding one of the pair of first link arms;
a second connector extends between the other of the pair of tie rods and a corresponding other of the pair of the first link arms;
a first straight line extends in a fore-aft direction and through the first connector;
a second straight line extends in a fore-aft direction and through the second connector; and
each of the pair of constant-velocity joints includes at least a portion thereof located between the first straight line and the second straight line in a plan view of the vehicle.

2. The vehicle according to claim 1 , wherein a third connector extends between one of the pair of first link arms and a corresponding one of the pair of second link arms, a fourth connector extends between the other of the pair of first link arms and a corresponding other of the pair of second link arms, a fifth connector extends between one of the pair of second link arms and the body frame, a sixth connector extends between the other of the pair of second link arms and the body frame, a third straight line extends through the third connector and the fourth connector, a fourth straight line extends through the fifth connector and the sixth connector, and the first connector, the second connector, and at least a portion of the pair of constant-velocity joints are located between the third straight line and the fourth straight line in the plan view.

3. The vehicle according to claim 2 , wherein, a fifth straight line extends in a fore-aft direction and through the third connector, and a sixth straight line extends in a fore-aft direction and through the fourth connector, and at least a portion of the front differential is located between the fifth straight line and the sixth straight line in the plan view.

4. The vehicle according to claim 2 , wherein at least a portion of the front differential is located in a region surrounded by a rectangle defined by vertices represented by the third connector, the fourth connector, the fifth connector, and the sixth connector in the plan view.

5. The vehicle according to claim 1 , wherein the front differential overlaps at least a portion of the steering mechanism in a front view of the vehicle.

6. The vehicle according to claim 1 , wherein at least one of the pitman arm, the pair of first link arms, and the pair of second link arms is inclined along an upper surface of the front differential in a side view of the vehicle.

7. The vehicle according to claim 1 , further comprising:
a pair of mounting shafts respectively connecting the pair of first link arms with the pair of tie rods; wherein
the pair of mounting shafts extend outward and upward of the vehicle, and the pair of tie rods extend diagonally downward from the pair of first link arms toward the pair of knuckle arms.

8. The vehicle according to claim 1 , wherein a connector extending between one of the pair of upper arms and the body frame, a connector extending between one of the pair of lower arms and the body frame, a connector extending between one of the pair of tie rods and one of the pair of first link arms, and one of the pair of constant-velocity joints are located in line in an up-down direction in a front view of the vehicle.

9. The vehicle according to claim 8 , wherein the connector extending between the one of the pair of upper arms and the body frame, the connector extending between the one of the pair of tie rods and the one of the pair of first link arms, the constant-velocity joint, and the connector extending between the one of the pair of lower arms and the body frame are located in this order from top to bottom of the vehicle.

10. The vehicle according to claim 1 , further comprising a ball joint at a connection between one of the pair of first link arms and one of the pair of second link arms to absorb an angular tolerance and/or an axial tolerance.

11. The vehicle according to claim 1 , further comprising a metal collar at a connection between one of the pair of second link arms and the body frame to absorb an angular tolerance and/or an axial tolerance.

12. The vehicle according to claim 1 , wherein
the body frame includes a front frame; and
a connector extending between one of the pair of upper arms and the body frame, a connector extending between one of the pair of lower arms and the body frame, a connector extending between one of the pair of tie rods and one of the pair of first link arms, and one of the pair of constant-velocity joints are located substantially outward of the front frame in a front view of the vehicle.

13. The vehicle according to claim 1 , wherein
a connector extending between one of the pair of tie rods and one of the pair of first link arms is located farther forward than a connector extending between one of the pair of tie rods and one of the pair of knuckle arms; and
the connector extending between the one of the pair of tie rods and the one of the pair of first link arms, and the connector extending between the one of the pair of tie rods and the one of the pair of knuckle arms are located farther rearward than a center of the front wheel.

14. The vehicle according to claim 1 , wherein at least a portion of a connector extending between one of the pair of second link arms and the body frame is located higher than a connector extending between the pitman arm and one of the pair of first link arms in a side view of the vehicle.

15. The vehicle according to claim 1 , further comprising:
a straddled seat supported by the body frame; and
a bar handle provided at an upper end portion of the steering shaft.

Assignees

• Yamaha Motor Co Ltd

Inventors

• Kamada Kensuke
• Tanaka Tatsuya

Classifications

• B62M7/02

  with engine between front and rear wheels · CPC title

• B60G7/005

  Ball joints (B60G7/006 takes precedence; for steering linkage B62D7/16; ball joints per se F16C11/06) · CPC title

• B60G7/001

  Suspension arms, e.g. constructional features (B60G7/006 takes precedence) · CPC title

• B62D7/16

  Arrangement of linkage connections (pivots per se F16C) · CPC title

• B62M17/00

  Transmissions characterised by use of rotary shaft, e.g. cardan shaft · CPC title