CN111806553A - An independent steering system with a steering motor placed on a single trailing arm of a single trailing arm suspension - Google Patents

Abstract

The invention relates to an independent steering system with a steering motor arranged on a single longitudinal arm of a single longitudinal arm suspension, belonging to the field of independent driving electric vehicles; the system comprises a single longitudinal arm, a steering motor, a steering knuckle and the like; the steering motor is fixedly connected to the single longitudinal arm through a motor support, and the output torque of the steering motor is transmitted to a steering knuckle driving the wheel assembly to steer through a motor output shaft, a steering rocker arm, a steering pull rod and a steering knuckle arm. The steering knuckle and the steering knuckle transition flange are connected through a pair of angular contact knuckle bearings and corresponding mounting structures thereof to realize a relative rotation function; the invention has compact structure, flexible steering and high integration degree, solves various problems caused by differential steering of the single-trailing-arm independent suspension only by the hub motor, and has important significance for the research and development of the independently driven single-trailing-arm suspension.

Description

An independent steering system with a steering motor placed on a single trailing arm of a single trailing arm suspension

technical field

The invention belongs to the field of single trailing arm independent suspension electric vehicles, in particular to an independent steering system in which a steering motor is placed on a single trailing arm of a single trailing arm suspension.

Background technique

The single trailing arm independent suspension that uses the in-wheel motor to directly drive the wheel has a very broad development prospect in the field of electric vehicles. This structure has the advantages of simple structure, saving interior space and maintaining the stability of the driving direction. The single trailing arm independent suspension driven by the in-wheel motor generally adopts differential steering. Due to the complexity of its motion, it is difficult to accurately describe the steering characteristics, and the tires are prone to side slip and wear.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the above-mentioned technologies, and to provide an independent steering system in which a steering motor is placed on a single trailing arm of a single trailing arm suspension.

An independent steering system in which a steering motor is placed on a single trailing arm of a single trailing arm suspension, comprising a single trailing arm (1), a steering motor (2), a motor support (3), a motor output shaft (4), a steering rocker Arm (5), steering link (6), steering knuckle arm (7), steering knuckle transition flange (8), steering knuckle (9), hub motor assembly (10), wheel assembly (11); steering The hub motor assembly (10) in the wheel assembly (11) of the segment (9) is fixedly connected;

The transition flange (8) is hinged with the two supports of the steering knuckle (3); the single trailing arm (1) is fixedly connected to the transition flange (8); the steering motor (2) is fixedly connected to the single trailing arm (1) The steering rocker arm (5) is fixedly connected to the motor output shaft (4); The arm (7) is hinged;

The transition flange (8) has two lugs, which are in one-to-one correspondence with the two supports on the steering knuckle (9); one side of the transition flange (8) is realized by bolts and a single trailing arm (1). The two lugs on the other side are in a one-to-one correspondence with the two supports of the steering knuckle (9) to achieve hinged connection.

Preferably, the steering link (6) is a variable length link.

Preferably, the steering motor (2) is fixedly connected to the single longitudinal arm (1) through the motor support (3)

Preferably, through holes are machined on the support of the steering knuckle (9) parallel to the surface direction of the steering knuckle (9), and through holes are also formed at the corresponding positions of the lugs of the transition flange (8); ) is fixed in the through hole of the support, the pin shaft (13) passes through the center hole of the angular contact spherical plain bearing (15) and the through hole of the support lug, and one end of the pin shaft (13) is pressed against the angular contact spherical plain bearing (15). On the inner ring, the other end is fixedly connected to the lug of the transition flange (8) through the combination of the flat washer (16), the spring washer (17) and the locking nut (18).

Preferably, the outer end face of the pin shaft (13) is sealed by the top end cover (12).

Preferably, the steering motor (2) is a servo motor with a planetary reducer integrated therein.

Preferably, the hub motor assembly (10) integrates a planetary reduction mechanism and a disc brake.

The present invention has the following beneficial effects:

The invention integrates a single trailing arm independent suspension driven by a wheel hub motor and a steering system with a wire-controlled link structure, which not only retains the advantages of the single trailing arm independent suspension having small changes in wheel camber angle and wheel base when the wheel jumps, but also It overcomes the shortcomings of easy tire wear during differential steering, and realizes the integration of single trailing arm suspension and independent steering system.

In the present invention, the steering motor is fixed on the single trailing arm. When the wheel jumps up and down, the entire steering system jumps up and down synchronously with the wheel, which avoids the movement interference between the steering rod system and the single trailing arm suspension. The arrangement allows the steering angle to be very large.

In the present invention, a steering knuckle transition flange is designed to be connected with the steering knuckle through an angular contact joint bearing. The angular contact joint bearing can bear radial load and axial load at the same time, and ensure the connection between the steering knuckle and the steering knuckle transition flange. flexible rotation between.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

FIG. 2 is a schematic half-sectional view of the connection structure between the steering knuckle and the steering knuckle transition flange of the present invention.

Among them, 1- single trailing arm, 2- steering motor, 3- motor support, 4- motor output shaft, 5- steering rocker arm, 6- steering connecting rod, 7- steering knuckle arm, 8- transition flange, 9 -Steering knuckle, 10-wheel hub motor assembly, 11-wheel assembly, 12-top end cover, 13-pin shaft, 14-steel wire retaining ring, 15-angular contact spherical plain bearing, 16-flat washer, 17-spring washer, 18- Lock nut.

Detailed ways

The technical solutions provided by the present invention are described in more detail below with reference to the accompanying drawings. The technical solutions obtained by replacing any technical means provided by the present invention or by combining the technical means or features provided by the present invention shall be included in the present invention. Within the protection scope of the invention, for example, changing the fixed connection method to integral molding or other fixed connection methods, and changing the hinge method from a joint bearing to a ball stud connection, etc., all belong to the protection scope of the present invention.

As shown in FIG. 1 , the present invention proposes an independent steering system in which a steering motor is placed on a single trailing arm of a single trailing arm suspension. Including single trailing arm 1, steering motor 2, motor support 3, motor output shaft 4, steering rocker arm 5, steering link 6, steering knuckle arm 7, transition flange 8, steering knuckle 9, hub motor assembly 10, Wheel assembly 11. The steering knuckle 9 is fixedly connected with the wheel hub motor assembly 10 through bolts.

The transition flange 8 is hinged with the two supports of the steering knuckle 3; the single trailing arm 1 is fixedly connected to the transition flange 8; the steering motor 2 is fixedly connected to the single trailing arm 1 through the motor support 3, ensuring that the steering motor 2 There is no relative movement with the single trailing arm 1 . The motor output shaft 4 of the steering motor 2 is fixedly connected with the steering rocker arm 5 through splines, so that the steering torque can be smoothly transmitted to the steering rocker arm 5 . One end of the steering link 6 is hinged with the steering rocker arm 5 through the rod end joint bearing, and the other end of the steering link 6 is also hinged with the steering knuckle arm 7 fixed on the steering knuckle 9 through the rod end joint bearing, and the steering link 6 The rod end joint bearings at both ends ensure the installation error between the steering rocker arm 5 and the steering knuckle arm 7. At the same time, the steering link 6 is a variable length link. By adjusting the positions of the locking nuts at both ends, it can be fine-tuned to a certain degree. length. The steering knuckle arm 7 is fixedly connected with the steering knuckle 9 by bolts, and the installation position of the steering knuckle arm 7 can be determined according to the position and length of the steering rocker arm 5 and the steering link 6, so as to ensure that the wheel assembly 11 is longitudinally facing in the initial state. forward.

As shown in Figures 1 and 2, in order to realize the rotation of the wheels under the driving of the steering mechanism, the steering knuckle 9 and the single trailing arm 1 must be rotated relative to each other, and a transition flange 8 is designed for this purpose. The transition flange 8 has two lugs, which are in one-to-one correspondence with the two supports on the steering knuckle 9; one side of the transition flange 8 is fixedly connected with the single trailing arm 1 by bolts, and the two supports on the other side are The ears are articulated in a one-to-one correspondence with the two supports of the steering knuckle 9 through the angular contact spherical plain bearing 15 . The connection structure between the transition flange 8 and the steering knuckle 9 is completely mirror-symmetrical up and down. Spring washer 17, lock nut 18. The support of the steering knuckle 9 is machined with through holes parallel to the surface direction of the steering knuckle 9, and the corresponding positions of the support ears of the transition flange 8 are also provided with through holes; the angular contact spherical bearing 15 is fixed in the through holes of the support, and the pin shaft 13 passes through the center hole of the angular contact spherical plain bearing 15 and the through hole of the support lug, one end of the pin shaft 13 is pressed on the inner ring of the angular contact spherical plain bearing 15, and the other end passes through the flat washer 16, the spring washer 17, and the lock nut 18. The combination is fixed on the lug of the transition flange 8 . The pin shaft 13 can rotate in the angular contact spherical plain bearing 15, and the relative rotation between the transition flange 8 and the steering knuckle 9 is realized. The outer end surface of the pin shaft 13 is sealed by the top cover 12 to cover the internal structure and prevent the limestone ash layer from entering the interior of the angular contact spherical plain bearing 15 . The angular contact spherical plain bearing 15 can bear radial force and axial force at the same time.

Steering motor 2 is a servo motor, which integrates a planetary reducer. According to the needs of the steering torque and considering the installation space, the planetary reducer can be one-stage or multi-stage.

The hub motor assembly 10 integrates a planetary reduction mechanism and a disc brake.

The working principle of the independent steering system of the present invention is as follows: since the single trailing arm 1 is fixed on the body, and the steering motor 2 and the steering rocker arm 5 are both fixed on the single trailing arm 1, they do not move relative to the body, and when the steering motor 2 The rotation of the motor output shaft 4 drives the steering rocker arm 5 to swing, thereby pulling the steering link 6; the steering link 6 drives the steering knuckle arm 7 and the steering knuckle 9 to rotate, thereby realizing turn.

Claims (7)

1. An independent steering system with a steering motor arranged on a single longitudinal arm of a single longitudinal arm suspension is characterized by comprising a single longitudinal arm (1), a steering motor (2), a motor support (3), a motor output shaft (4), a steering rocker arm (5), a steering connecting rod (6), a steering knuckle arm (7), a steering knuckle transition flange (8), a steering knuckle (9), a hub motor assembly (10) and a wheel assembly (11); a hub motor assembly (10) in a wheel assembly (11) of the steering knuckle (9) is fixedly connected;

the transition flange (8) is hinged with two supports of the steering knuckle (3); the single longitudinal arm (1) is fixedly connected to the transition flange (8); the steering motor (2) is fixedly connected to the single longitudinal arm (1); the steering rocker arm (5) is fixedly connected to the motor output shaft (4); one end of the steering connecting rod (6) is hinged with the steering rocker arm (5), and the other end of the steering connecting rod is hinged with a steering knuckle arm (7) fixedly connected with a steering knuckle (9);

the transition flange (8) is provided with two lugs which are respectively in one-to-one correspondence with the two supports on the steering knuckle (9); one side of the transition flange (8) is fixedly connected with the single longitudinal arm (1) through bolts, and the two support lugs on the other side are hinged with the two supports of the steering knuckle (9) in a one-to-one correspondence mode.

2. An independent steering system with steering motor on single trailing arm of single trailing arm suspension according to claim 1 characterized in that the steering linkage (6) is a variable length linkage.

3. The independent steering system with the steering motor arranged on the single trailing arm of the single trailing arm suspension is characterized in that the steering motor (2) is fixedly connected to the single trailing arm (1) through a motor support (3).

4. The independent steering system with the steering motor arranged on the single trailing arm of the single trailing arm suspension according to claim 1 is characterized in that a through hole is formed in a support of the steering knuckle (9) in a direction parallel to the surface of the steering knuckle (9), and a through hole is formed in a position corresponding to a support lug of the transition flange (8); the angular contact knuckle bearing (15) is fixed in a through hole of the support, a pin shaft (13) penetrates through a center hole of the angular contact knuckle bearing (15) and a through hole of the support lug, one end of the pin shaft (13) is pressed on an inner ring of the angular contact knuckle bearing (15), and the other end of the pin shaft is fixedly connected to the support lug of the transition flange (8) through the combination of a flat pad (16), an elastic pad (17) and a locking nut (18).

5. The independent steering system with a steering motor placed on the single trailing arm of the single trailing arm suspension according to claim 1, wherein the outer end face of the pin shaft (13) is sealed by a top end cap (12).

6. Independent steering system with steering motor on single trailing arm of single trailing arm suspension according to claim 1 characterized by that, the steering motor (2) is servo motor with planetary reducer integrated inside.

7. The independent steering system with a steering motor placed on a single trailing arm of a single trailing arm suspension according to claim 1, wherein the in-wheel motor assembly (10) integrates a planetary reduction mechanism and a disc brake.

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