CN110239611B

CN110239611B - All-terrain vehicle and steering system thereof

Info

Publication number: CN110239611B
Application number: CN201910405828.8A
Authority: CN
Inventors: 李想; 范戈
Original assignee: Segway Technology Co Ltd
Current assignee: Segway Technology Co Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2021-02-12
Anticipated expiration: 2039-05-16
Also published as: CN110239611A

Abstract

The invention discloses an all-terrain vehicle and a steering system thereof. The steering system includes: a steering wheel; a steering assist device having an upper connecting shaft and a first connecting shaft; the steering cross shaft assembly comprises a rotating shaft and a driven shaft, the upper end of the rotating shaft is connected with the steering wheel, the upper end of the driven shaft is connected with the lower end of the rotating shaft through an upper cross shaft joint, the lower end of the driven shaft is provided with a lower cross shaft joint, and the lower cross shaft joint is connected with the upper connecting shaft; the direction column tube is rotatably sleeved outside the rotating shaft and is rotatably connected to the frame, and the central point of the upper cross shaft joint is positioned on the rotating axis of the direction column relative to the frame; a steering gear. According to the steering system provided by the embodiment of the invention, the assembly procedures are reduced, the installation precision is high, and the cost is low; in addition, the steering clearance of the steering wheel is reduced; in addition, the precision of the steering system can be further improved, and the requirement for adjusting the steering wheel is met.

Description

All-terrain vehicle and steering system thereof

Technical Field

The invention relates to the field of all-terrain vehicles, in particular to a steering system of an all-terrain vehicle and the all-terrain vehicle with the steering system.

Background

In the related art steering systems for four-wheeled atvs, it is often necessary to provide a power steering system to assist the driver in more easily maneuvering the vehicle. One end of the power steering system is connected with the steering wheel, and the other end of the power steering system is connected with the steering gear. The steering wheel 4 ' is connected to the power steering system 1 ' by a pair of upper cross joint shafts 51 ', a slide fork 52 ' and a rotation shaft 53 ', and as shown in fig. 9, the connection has many parts, is complicated to assemble and is costly. In addition, due to the fact that the sliding fork structure with the internal spline and the external spline is adopted, steering virtual positions of a steering wheel can be caused, steering hand feeling is poor, and judgment of a driver on road conditions and vehicles can be influenced when the driver drives violently, so that great potential safety hazards are formed.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, the invention proposes a steering system for an all-terrain vehicle.

The invention also provides an all-terrain vehicle comprising the steering system.

A steering system for an all-terrain vehicle according to an embodiment of a first aspect of the invention, comprising: a steering wheel; the upper part of the power steering device is provided with an upper connecting shaft, and the lower part of the power steering device is provided with a first connecting shaft; the steering cross shaft assembly comprises a rotating shaft and a driven shaft, the upper end of the rotating shaft is connected with the steering wheel so as to be driven by the steering wheel to rotate, the upper end of the driven shaft is connected with the lower end of the rotating shaft through an upper cross shaft joint, the lower end of the driven shaft is provided with a lower cross shaft joint, and the lower cross shaft joint is connected with the upper connecting shaft; the steering column tube is rotatably sleeved outside the rotating shaft and rotatably connected to the frame, the central point of the upper cross shaft joint is located on the rotating axis of the steering column tube relative to the frame, and the steering gear is provided with a second connecting shaft which is connected with the first connecting shaft.

According to the steering system provided by the embodiment of the invention, the rotating shaft and the driven shaft are arranged into an integral module, so that the integration level of parts is high, the assembly procedures are reduced, the installation precision is high, and the cost is low. In addition, the sliding fork structure in the prior related art is eliminated, and the steering clearance of the steering wheel is reduced. In addition, the central point of the upper cross-shaped shaft joint is collinear with the rotation axis of the steering column tube relative to the frame, so that the length of the steering cross-shaped shaft assembly is not changed when the steering wheel is adjusted, the accuracy of a steering system is further improved, and the requirement for adjusting the steering wheel is met.

According to some embodiments of the invention, the steering wheel has a central hole through which an upper end of the rotation shaft passes and is fixed by a set nut.

According to some embodiments of the present invention, the lower end of the lower spider has a spline portion having a spline through hole and a through groove communicating with the spline through hole, and an extending direction of the through groove coincides with an extending direction of the spline through hole; after the upper connecting shaft is matched with the spline through hole, the connecting piece penetrates through the spline part to clamp the width of the through groove. Through setting up logical groove, can eliminate the fit clearance between last connecting axle and the spline through-hole to the wearing and tearing that have avoided leading to by this fit clearance are unusual and the reduction of spline life-span.

According to some embodiments of the present invention, the upper connecting shaft has an upper groove, the spline portion further has a spline connecting hole adapted to pass through the connecting member, an axis of the spline connecting hole perpendicularly intersects an extending direction of the through groove, and the connecting member passes through the spline connecting hole and the upper groove to fix the upper connecting shaft and the spline portion.

According to some embodiments of the invention, the steering column tube is rotatably sleeved outside the rotating shaft by at least two rolling bearings.

According to some embodiments of the invention, the rolling bearing comprises an upper bearing and a lower bearing, the steering system further comprises a retainer ring, and the rotating shaft passes through the lower bearing, the upper bearing and the retainer ring in sequence and then is connected with the steering wheel.

According to some embodiments of the invention, the steering system further comprises a connecting sleeve having first and second splined bores therein for splined engagement with the first and second connecting shafts, respectively. The steering power assisting device and the steering gear are in spline fit, so that the steering power assisting device is simple and compact in structure, small in occupied space and low in cost.

According to some embodiments of the invention, the connecting sleeve comprises: a first key sleeve having a first left keyway and a second left keyway; the second key sleeve is provided with a first right key groove and a second right key groove, the first spline hole is limited between the first left key groove and the first right key groove, the second spline hole is limited between the second left key groove and the second right key groove, and the first spline hole is coaxial with the second spline hole.

According to some embodiments of the present invention, one end of the first key sleeve and one end of the second key sleeve are connected and the other ends are arranged at intervals to form a clearance gap, and the clearance gap is parallel to the axis of the first spline hole; the connecting sleeve is provided with a plurality of connecting holes, the axis direction of each connecting hole is perpendicular to the axis of the corresponding first spline hole and the extending direction of the corresponding clearance gap, and the plurality of fixing pieces penetrate through the connecting holes to clamp the first key sleeve and the second key sleeve respectively. From this, the location is convenient, and the assembly direction perpendicular to the longitudinal plane of vehicle of mounting moreover, and operator's convenient assembling dismantles easily, and the dismouting is efficient.

In addition, through setting up the clearance gap, after first connecting shaft inserts first splined hole, the second connecting shaft inserts in the second splined hole, when the mounting presss from both sides tight first key sleeve and second key sleeve, this clearance gap will narrow gradually to eliminate the fit clearance between first connecting shaft and first splined hole and second connecting shaft and the second splined hole, thereby avoided wearing and tearing that leads to by this fit clearance unusual and the spline life-span reduces.

According to some embodiments of the invention, the first connecting shaft has a first annular groove formed along a circumferential direction thereof, and the second connecting shaft has a second annular groove formed along a circumferential direction thereof; the fixing piece comprises an upper fixing piece and a lower fixing piece, the upper fixing piece penetrates through the connecting sleeve and is matched with the first annular groove to fix and position the first connecting shaft and the first spline hole, and the lower fixing piece penetrates through the connecting sleeve and is matched with the second annular groove to fix and position the second connecting shaft and the second spline hole.

Optionally, the first key sleeve has a first upper connecting hole and a first lower connecting hole, and the second key sleeve has a second upper connecting hole and a second lower connecting hole; the upper fixing piece sequentially penetrates through the first upper connecting hole, the first annular groove and the second upper connecting hole and is fixed, and the lower fixing piece sequentially penetrates through the second lower connecting hole, the second annular groove and the first lower connecting hole and is fixed. Therefore, the limiting and positioning among the first connecting shaft, the second connecting shaft and the connecting sleeve can be realized more accurately.

Optionally, the first upper connecting hole and the second lower connecting hole are both through holes, and the second upper connecting hole and the first lower connecting hole are both threaded holes. From this, go up mounting and lower mounting and assemble respectively from the both sides of adapter sleeve and get into, can balance the unbalance amount that first connecting axle and second connecting axle produced when rotating, reduce vibration and noise.

An all-terrain vehicle according to an embodiment of the second aspect of the invention, comprises: a steering system for an all-terrain vehicle according to an embodiment of the first aspect of the invention; a frame; the mounting piece is detachably connected to the frame and is in screw connection with the power steering device; and the fixed support is fixed on the frame, and the direction column tube is rotatably connected to the fixed support.

According to some embodiments of the invention, the frame comprises first and second generally perpendicular brackets, the mounting member comprising:

a body portion screwed to the steering assist device; a first lug part which is connected to one side edge of the body part and forms an angle with the body part, wherein the free end of the first lug part is provided with a first flange part which is connected with the first bracket screw; and the second lug part is connected to the other side edge of the body part and forms an angle with the body part, the free end part of the second lug part is provided with a second flange part, and the second flange part is connected with the second bracket through a screw.

According to some embodiments of the invention, the mounting member is integrally formed and the first and second flange portions are provided with oblong screw holes. Through setting up the screw hole of obround, can offset the manufacturing error of frame welding etc. when the assembly to the influence of manufacturing error to the assembly has been reduced.

According to some embodiments of the invention, the lower end of the steering column tube has a first leg and a second leg arranged at a distance, the fixed bracket comprises a first fixing frame and a second fixing frame connected to the frame at a distance, and the first leg and the second leg are rotatably connected between the first fixing frame and the second fixing frame by a pin shaft.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of a steering system according to one embodiment of the present invention mounted on a vehicle frame;

FIG. 2 is an enlarged view of the circled portion C of FIG. 1;

FIG. 3a is an exploded view of a steering system according to an embodiment of the present invention;

FIG. 3b is a sectional view of the portion of FIG. 3a where the steering wheel is connected to the rotating shaft;

FIG. 4 is an enlarged view of the lower end of the driven shaft and the power steering apparatus in the steering system of FIG. 3 a;

FIG. 5 is an exploded view of a steering assist unit and a steering gear in a steering system according to another embodiment of the present invention;

FIG. 6 is an enlarged view of the circled portion B of FIG. 5;

fig. 7a is a plan view of a connection sleeve in a steering system according to an embodiment of the present invention;

FIG. 7b is a cross-sectional view taken along line A-A of FIG. 7 a;

FIG. 8 is a schematic view of a steering assist apparatus mounted to a vehicle frame in a steering system according to an embodiment of the present invention;

fig. 9 is a schematic view of a steering system in the related art.

Reference numerals:

a steering system 100;

a steering power assist device 1; a first connecting shaft 11; a first annular groove 111; an upper connecting shaft 12; an upper groove 121;

a steering gear 2; a second connecting shaft 21; a second annular groove 211;

a connecting sleeve 3; a first splined bore 30 a; a second spline hole 30 b;

first key sleeve 31; a first left keyway 311; a second left keyway 312;

a second key sleeve 32; the first right key groove 321; a second right keyway 322;

a gap seam 33; a connecting hole 34;

the first upper connection hole 341 a; the first lower connection holes 341 b;

the second upper connection hole 342 a; the second lower connection hole 342 b;

a steering wheel 4; a central hole 41;

a steering cross shaft assembly 5; a rotating shaft 51; a step surface 511; an annular groove 512; a tapered section 513;

the driven shaft 52; an upper spider boss 53; a lower spider boss 54;

a spline portion 55; a through slot 552; spline connection hole 553;

a connector 56; a washer 57; a set nut 58;

a pull rod 6; a steering column tube 7; a first leg 71; a second leg 72; a pin 73; a mounting ear 74;

rolling

bearings

8a, 8 b; a retainer ring 9;

a frame 200; a first bracket 210; a second bracket 220;

a mounting member 300; a body portion 310; a first ear 320; a second ear 330;

a first flange portion 340; a second flange portion 350;

a fixing bracket 400; a first fixing frame 410; a second holder 420;

a gas spring 500.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

In the description of the present invention, it is to be understood that the terms "center", "width", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.

Turning now to fig. 1-8, a steering system for an all-terrain vehicle according to an embodiment of the present invention is described, as shown in fig. 1, the steering system being mountable to a vehicle frame 200.

As shown in fig. 1 and 2, a steering system 100 for an all-terrain vehicle according to some embodiments of the present invention includes a steering wheel 4, a steering assist device 1, a steering cross-axle assembly 5, and a steering column 7. As shown in fig. 1, the power steering device 1 may be connected to a steering wheel 4 at an upper end thereof and to a steering gear 2 at a lower end thereof, and the steering gear 2 is connected to a knuckle (not shown) connected to a front wheel (not shown) via a tie rod 6. Thus, when the steering wheel 4 is turned, torque is transmitted to the front wheels through the steering assist device 1, the steering gear 2, the tie rod 6, and the knuckle, so that the front wheels can be steered.

As shown in fig. 3a, the power steering apparatus 1 has an upper connecting shaft 12, the steering cross assembly 5 includes a rotating shaft 51 and a driven shaft 52, an upper end of the rotating shaft 51 is connected to the steering wheel 4 to be rotated by the steering wheel 4, an upper end of the driven shaft 52 is connected to a lower end of the rotating shaft 51 through an upper cross joint 53, a lower cross joint 54 is provided at a lower end of the driven shaft 52, and the lower cross joint 54 is connected to the upper connecting shaft 12.

The direction pillar 7 is rotatably sleeved outside the rotating shaft 51 and rotatably connected to the frame 200. As shown in fig. 1 and 3a, one end of the air spring tube 500 is connected to the frame 200, and the other end is fixed to the mounting lug 74 of the steering column tube 7. As shown in fig. 3a, the center point of the upper spider 53 is located on the rotation axis of the steering column with respect to the frame 200. Alternatively, the direction column tube 7 is made of an integral aluminum alloy piece, and has high precision and light weight.

As shown in fig. 1 to 3a, when the steering wheel 4 is rotated, the steering column 7 is not rotated, the rotating shaft 51 in the steering column 7 is rotated, and torque is transmitted downward to the steering assist device 1 through the driven shaft 52 and the upper and

lower cross knuckles

53 and 54, and then transmitted to the front wheels through the steering gear 2, the tie rod 6, and the knuckle, so that the front wheels are rotated. When the height of the steering wheel needs to be adjusted, as shown in fig. 1 and fig. 3a, the gas spring 500 stretches and retracts to drive the steering column tube 7 to rotate relative to the rotation axis thereof, so that the height adjustment of the steering wheel 4 is realized.

According to the steering system provided by the embodiment of the invention, the rotating shaft and the driven shaft are arranged into an integral module, so that the integration level of parts is high, the assembly procedures are reduced, the installation precision is high, and the cost is low. In addition, the sliding fork structure in the prior related art is eliminated, and the steering clearance of the steering wheel is reduced. In addition, by aligning the center point of the upper cross-axle joint 53 with the rotation axis of the steering column relative to the frame 200, the length of the steering cross-axle assembly will not be changed during steering wheel adjustment, thereby further improving the accuracy of the steering system and meeting the steering wheel adjustment requirement.

According to some embodiments of the present invention, as shown in fig. 2 to 3b, the steering wheel 4 has a central hole 41, and the upper end of the rotating shaft 51 is fixed by a retaining nut 58 after being spline-fitted with the central hole 41, so that the rotating shaft 51 is connected to the steering wheel 4 to be driven to rotate, and the axial clearance between the steering wheel 4 and the rotating shaft 51 is eliminated by the retaining nut 58. In addition, as shown in fig. 3a, the rotating shaft 51 has a tapered section 513, and accordingly, a portion of the center hole 41 of the steering wheel 4 is tapered, and the tapered section is engaged with a corresponding tapered portion of the center hole 41 when the rotating shaft 51 passes through the steering wheel 4, thereby eliminating a radial gap between the steering wheel 4 and the rotating shaft 51.

According to some embodiments of the present invention, as shown in fig. 4, the lower end of the lower cross coupling 54 has a spline portion 55, the spline portion 55 has a spline through hole (not shown) and a through groove 552 communicating with the spline through hole, and the through groove 552 extends in the same direction as the spline through hole. After the upper connecting shaft 12 is fitted to the spline through-hole, the connecting member 56 (e.g., a screw or a bolt) passes through the spline portion 55 through the washer 57 to clamp the width of the through-groove 552, and in this process, the through-groove 552 becomes gradually narrower, so that the fitting gap between the upper connecting shaft 12 and the spline through-hole is eliminated, thereby avoiding abnormal wear and reduced spline life caused by the fitting gap.

In the example shown in fig. 4, the upper connecting shaft 12 has an upper groove 121, the spline portion 55 further has a spline connecting hole 553 adapted to pass through the connector 56, an axis of the spline connecting hole 553 perpendicularly intersects an extending direction of the through groove 552, and the connector 56 passes through the spline connecting hole 553 and the upper groove 121 to fix the upper connecting shaft 12 with the spline portion 55. In addition, in the actual assembly process, because parts such as the frame have manufacturing errors inevitably, the relative position between the upper connecting shaft 12 and the spline part 55 has deviation, and the upper groove 121 can counteract the assembly difficulty caused by the manufacturing errors.

According to some embodiments of the present invention, as shown in fig. 2, the direction tube 7 is rotatably fitted over the rotation shaft 51 by at least two rolling bearings. In some alternative examples, the rolling bearing includes an upper bearing 8a and a lower bearing 8b, the steering system further includes a retaining ring 9, and the rotating shaft 51 is connected to the steering wheel 4 after passing through the lower bearing 8b, the upper bearing 8a and the retaining ring 8 in sequence and is fixed to the positioning nut 58.

More specifically, as shown in fig. 3b, the upper bearing 8a and the lower bearing 8b are first press-fitted into the direction column 7, the rotating shaft 51 is fitted into the direction column 7 from below to above, and the stepped surface 511 on the lower portion of the rotating shaft 8a is in contact with the lower surface of the lower bearing 8 b. The rotary shaft 51 has an annular groove 512, and the retainer ring 9 is fitted in the annular groove 512 from above the direction column tube 7 after the upper end of the rotary shaft 51 passes through the upper bearing 8a, and the lower surface of the retainer ring 9 is in contact fit with the upper surface of the upper bearing 8 a. This achieves the engagement between the rotary shaft 51 and the steering column 7, which is then connected to the steering wheel 4.

The coupling between the steering assist device 1 and the steering gear box 2 will be described in detail with reference to fig. 5 to 8.

As shown in fig. 5 and 6, the power steering device 1 further has a first connecting shaft 11, the steering gear box 2 has a second connecting shaft 21, and the connecting sleeve 3 has a first spline hole 30a and a second spline hole 30b therein, which are spline-fitted to the first connecting shaft 11 and the second connecting shaft 21, respectively.

According to the steering system of the all-terrain vehicle provided by the embodiment of the invention, the spline fit mode is adopted between the power steering device 1 and the steering gear 2, so that the steering system is simple and compact in structure, small in occupied space and low in cost.

As shown in fig. 6, according to some embodiments of the present invention, the connection sleeve 3 may include a first key sleeve 31 and a second key sleeve 32. As shown in fig. 7a, first key sleeve 31 has first left key groove 311 and second left key groove 312, second key sleeve 32 has first right key groove 321 and second right key groove 322, first splined hole 30a is defined between first left key groove 311 and first right key groove 321, second splined hole 30b is defined between second left key groove 312 and second right key groove 322, and first splined hole 30a is coaxial with second splined hole 30 b.

Further, as shown in fig. 6 and 7a, the first and second

key sleeves

31 and 32 are connected at one end and spaced apart from each other at the other end to form a gap 33, and the gap 33 is parallel to the axis of the first spline hole 30 a. The connecting sleeve 3 is provided with a plurality of connecting holes 34, the axial direction of the connecting holes 34 is perpendicular to the axial line of the first spline hole 30a and the extending direction of the clearance gap 33, a plurality of fixing pieces 600 (such as bolts) respectively penetrate through the connecting holes 34 to clamp the first key sleeve 31 and the second key sleeve 32, the positioning is convenient, the assembling direction of the fixing pieces 600 is perpendicular to the longitudinal plane of the vehicle, and an operator can assemble the connecting pieces conveniently, disassemble the connecting pieces easily and assemble the connecting pieces efficiently. In addition, by providing the clearance gap 33, when the fixing member 600 clamps the first and second

key housings

31 and 32 after the first connecting shaft 11 is inserted into the first and

second spline holes

30a and 21 are inserted into the second spline hole 30b, the clearance gap 33 is gradually narrowed, so that the fit-up gap between the first connecting shaft 11 and the first spline hole 30a and between the second connecting shaft 21 and the second spline hole 30b is eliminated, thereby avoiding abnormal wear and reduced spline life caused by the fit-up gap.

As shown in fig. 6, according to some embodiments of the present invention, the first connecting shaft 11 has a first annular groove 111 formed along a circumferential direction thereof, and the second connecting shaft 21 has a second annular groove 211 formed along a circumferential direction thereof, and the fixing member 600 includes an upper fixing member 601 and a lower fixing member 602, the upper fixing member 601 passing through the coupling sleeve 3 and engaging with the first annular groove 111 to fix and position the first connecting shaft 11 with the first spline hole 30a, and the lower fixing member 602 passing through the coupling sleeve 3 and engaging with the second annular groove 211 to fix and position the second connecting shaft 21 with the second spline hole 30 b. For example, after the upper fixing member 601 passes through a portion of the connecting sleeve 3, the position of the first connecting shaft 11 and the first spline hole 30a is defined by the first annular groove 111, and then the upper fixing member passes through another portion of the connecting sleeve 3, and then the connecting sleeve 3 is clamped and the width of the clearance gap 33 is reduced, so that the position of the first connecting shaft 11 and the first spline hole 30a is limited and positioned. The lower fixing member 6001 works similarly.

As shown in fig. 6 and fig. 7a and 7b, in some more specific examples, the first key sleeve 31 has a first upper connection hole 341a and a first lower connection hole 341b, and the second key sleeve 32 has a second upper connection hole 342a and a second lower connection hole 342 b. The upper fixing member 601 passes through and is fixed to the first upper connection hole 341a, the first annular groove 111, and the second upper connection hole 342a in sequence, and the lower fixing member 602 passes through and is fixed to the second lower connection hole 342b, the second annular groove 211, and the first lower connection hole 341b in sequence. Therefore, the limiting and positioning among the first connecting shaft 11, the second connecting shaft 21 and the connecting sleeve 3 can be realized more accurately.

In an alternative example as shown in fig. 7a and 7b, the first upper connection hole 341a and the second lower connection hole 342b are both through holes, the second upper connection hole 342a and the first lower connection hole 341b are both screw holes, and the inner diameter of the screw holes is smaller than the inner diameter of the through holes. That is, the holes in the first and

second keyways

31 and 32 are arranged in mirror image, and the upper and

lower fixtures

601 and 602 are both bolts. Thus, after the first connecting shaft 11 and the second connecting shaft 21 extend into the spline housing 4, the upper fixing member, i.e., the bolt 41, first passes through the through hole 341a, passes through the first annular groove 111, and then is screwed, so that the upper ends of the first key housing 31 and the second key housing 32 are clamped; the lower fixing member, i.e., the bolt 42, is inserted through the through hole 342b, passes through the second annular groove 211, and is then screwed, thereby clamping the lower ends of the first and second

key sleeves

31 and 32. In addition, the upper fixing piece 601 and the lower fixing piece 602 are respectively assembled from two sides of the connecting sleeve 3, so that the unbalance generated by the first connecting shaft 11 and the second connecting shaft 21 during rotation can be balanced, and vibration and noise are reduced.

In some embodiments of the present invention, the inner diameter of the first spline hole 30a is larger than the inner diameter of the second spline hole 30b, as shown in fig. 7b, that is, a step is formed inside the connecting sleeve 3, and the first spline hole 30a and the second spline hole 30b are respectively formed on both sides of the step, so that the formation of the spline holes is convenient.

An all-terrain vehicle according to an embodiment of the second aspect of the invention comprises a steering system 100, a frame 200, a mounting member 300 and a fixing bracket 400 of the all-terrain vehicle according to the above-described embodiment.

As shown in fig. 1, the steering system 100 is mounted on the vehicle frame 200, the mounting member 300 is detachably attached to the vehicle frame 200, and the mounting member 300 is screwed to the power steering apparatus 1. Thus, the power steering device 1 is convenient to disassemble and assemble and occupies a small space. The fixing bracket 400 is fixed on the frame 200, the direction column tube 7 is rotatably connected on the fixing bracket 200, and the upper end of the direction column tube 7 is stopped against the steering wheel 4, so that the telescopic pushing direction column tube 7 of the gas spring 500 is controlled to drive the steering wheel to adjust the height or the angle.

According to some embodiments of the present invention, the frame 200 comprises a first bracket 210 and a second bracket 220 that are substantially vertical, the mounting member 300 comprises a body portion 310, a first ear portion 320, and a second ear portion 330, as shown in fig. 8, the body portion 310 is connected to the power steering apparatus 1 by a plurality of screws 360.

First ear 320 is connected to one side edge of body 310 and has an angle with body 310, the free end of first ear 320 has first flange 340, first flange 340 is connected with first bracket 210 by screw 370, second ear 330 is connected to the other side edge of body 310 and has an angle with body 310, the free end of second ear 330 has second flange 350, and second flange 350 is connected with second bracket 220 by screw 370. Optionally, oblong screw holes 341, 351 are provided on the first and

second flange portions

340, 350 to enable screw connection with the first and second brackets 210, 220. Through setting up the screw hole of obround, can offset the manufacturing error of frame welding etc. when the assembly to the influence of manufacturing error to the assembly has been reduced.

In some embodiments, as shown in fig. 1 and 3a, the lower end of the direction pillar 7 has a first leg 71 and a second leg 72 spaced apart from each other, the fixing bracket 400 includes a first fixing bracket 410 and a second fixing bracket 420 spaced apart from each other and connected to the frame 200, and the first leg 71 and the second leg 72 are rotatably connected between the first fixing bracket 410 and the second fixing bracket 420 by a pin 73. Thus, when the gas spring 500 expands and contracts, the steering column 7 rotates relative to the vehicle body frame 200 via the pin 73, and the height or angle of the steering wheel is adjusted.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A steering system for an all terrain vehicle, comprising:

a steering wheel;

the upper part of the power steering device is provided with an upper connecting shaft, and the lower part of the power steering device is provided with a first connecting shaft;

the steering cross shaft assembly comprises a rotating shaft and a driven shaft, the upper end of the rotating shaft is connected with the steering wheel so as to be driven by the steering wheel to rotate, the upper end of the driven shaft is connected with the lower end of the rotating shaft through an upper cross shaft joint, the lower end of the driven shaft is provided with a lower cross shaft joint, and the lower cross shaft joint is connected with the upper connecting shaft;

the direction column tube is rotatably sleeved outside the rotating shaft and is rotatably connected to the frame, and the central point of the upper cross shaft joint is positioned on the rotating axis of the direction column tube relative to the frame;

the steering gear comprises a second connecting shaft, and the second connecting shaft is connected with the first connecting shaft;

the adapter sleeve, have respectively in the adapter sleeve with first splined hole and second splined hole of first connecting shaft with second connecting shaft spline fit, the adapter sleeve includes:

a first key sleeve having a first left keyway and a second left keyway;

a second key sleeve having a first right keyway and a second right keyway, the first splined bore defined between the first left keyway and the first right keyway, the second splined bore defined by the second left keyway and the second right keyway, the first splined bore coaxial with the second splined bore,

one ends of the first key sleeve and the second key sleeve are connected, and the other ends of the first key sleeve and the second key sleeve are arranged at intervals relatively to form a clearance gap which is parallel to the axis of the first spline hole;

the connecting sleeve is provided with a plurality of connecting holes, the axis direction of each connecting hole is perpendicular to the axis of the corresponding first spline hole and the extending direction of the corresponding clearance gap, and the plurality of fixing pieces penetrate through the connecting holes to clamp the first key sleeve and the second key sleeve respectively.

2. The steering system of an all-terrain vehicle of claim 1, characterized in that the steering wheel has a central aperture through which the upper end of the rotating shaft passes and is secured by a retaining nut.

3. The steering system of an all-terrain vehicle of claim 1, characterized in that the lower end of the lower cross-axle joint has a splined portion having a splined through-hole and a through-slot communicating with the splined through-hole, the through-slot extending in a direction coincident with the direction of extension of the splined through-hole; after the upper connecting shaft is matched with the spline through hole, the connecting piece penetrates through the spline part to clamp the width of the through groove.

4. The steering system of an all-terrain vehicle of claim 3, characterized in that the upper connecting shaft has an upper groove, the splined portion further has a splined connecting bore adapted to pass through the connector, an axis of the splined connecting bore perpendicularly intersecting a direction of extension of the through slot, the connector passing through the splined connecting bore and the upper groove to secure the upper connecting shaft with the splined portion.

5. The steering system of an all-terrain vehicle of any of claims 1-4, characterized in that the direction tube is rotatably fitted over the rotating shaft by at least two rolling bearings.

6. The all-terrain vehicle steering system of claim 5, characterized in that the rolling bearing comprises an upper bearing and a lower bearing, and the steering system further comprises a retainer ring, and the rotating shaft is connected with the steering wheel after sequentially passing through the lower bearing, the upper bearing and the retainer ring.

7. The steering system for an all-terrain vehicle of claim 1, characterized in that the first connecting shaft has a first annular groove disposed circumferentially therealong, and the second connecting shaft has a second annular groove disposed circumferentially thereabout;

the fixing piece comprises an upper fixing piece and a lower fixing piece, the upper fixing piece penetrates through the connecting sleeve and is matched with the first annular groove to fix and position the first connecting shaft and the first spline hole, and the lower fixing piece penetrates through the connecting sleeve and is matched with the second annular groove to fix and position the second connecting shaft and the second spline hole.

8. The steering system of an all-terrain vehicle of claim 7, characterized in that the first key sleeve has a first upper attachment hole and a first lower attachment hole, and the second key sleeve has a second upper attachment hole and a second lower attachment hole;

the upper fixing piece sequentially penetrates through the first upper connecting hole, the first annular groove and the second upper connecting hole and is fixed, and the lower fixing piece sequentially penetrates through the second lower connecting hole, the second annular groove and the first lower connecting hole and is fixed.

9. The steering system of an all-terrain vehicle of claim 8, wherein the first upper attachment aperture and the second lower attachment aperture are both through-holes, and the second upper attachment aperture and the first lower attachment aperture are both threaded holes.

10. An all-terrain vehicle, comprising:

the steering system of an all-terrain vehicle of any of claims 1-9;

a frame;

the mounting piece is detachably connected to the frame and is in screw connection with the power steering device;

the fixed support is fixed on the frame, and the direction column tube is rotatably connected to the fixed support.

11. The all-terrain vehicle of claim 10, characterized in that the frame comprises first and second generally vertical brackets, and the mount comprises:

a body portion screwed to the steering assist device;

a first lug part which is connected to one side edge of the body part and forms an angle with the body part, wherein the free end of the first lug part is provided with a first flange part which is connected with the first bracket screw;

and the second lug part is connected to the other side edge of the body part and forms an angle with the body part, the free end part of the second lug part is provided with a second flange part, and the second flange part is connected with the second bracket through a screw.

12. The all-terrain vehicle of claim 11, characterized in that the mounting member is integrally formed and oblong screw holes are provided in the first and second flange portions.

13. The all-terrain vehicle of claim 12, characterized in that the lower end of the direction tube has first and second spaced-apart legs, and the fixed bracket includes first and second mounts connected to the frame at spaced-apart intervals, the first and second legs being rotatably connected between the first and second mounts by a pin.