CN211592101U

CN211592101U - Wheel axle and wheel assembly

Info

Publication number: CN211592101U
Application number: CN201922111852.9U
Authority: CN
Inventors: 王晓鸿; 胡京城; 武志国; 孙浙勇
Original assignee: Kunshan Tangze New Energy Technology Co ltd
Current assignee: Kunshan Tangze New Energy Technology Co ltd
Priority date: 2019-11-30
Filing date: 2019-11-30
Publication date: 2020-09-29
Anticipated expiration: 2029-11-30

Abstract

The utility model provides a wheel shaft and a wheel assembly using the wheel shaft, wherein the wheel shaft comprises a shaft body and a shaft shoulder on the shaft body, and the shaft part radially protrudes out of the surface of the shaft body; the first side of the shaft shoulder is abutted against a bearing arranged on the shaft body; and the second side of the shaft shoulder bears the axial external force, so that the axial external force does not act on the bearing. The shaft shoulder can prevent the bearing from being worn, and simultaneously eliminates the axial clearance to improve the running smoothness of the wheel.

Description

Wheel axle and wheel assembly

Technical Field

The present invention is in the field of machinery and particularly relates to such improvements in axles and wheels.

Background

The central shaft used by the electric skateboard wheel set in the current market is mostly a step shaft or an optical shaft. When the electric scooter falls sideways or receives external force from the axial direction, the bearing is easy to generate abnormal sound, blockage, deadlocking and the like. This problem can create significant safety concerns for the rider.

This is because the polished rod axle, the axle can't be fixed with the wheelset, only adds a section of sleeve pipe in the middle of the axle and comes spacing bearing, leads to when the lock is closed at the front fork (back vent) direct effort on the bearing for the bearing is direct to rub with stop gear, makes wheel hub's life-span, precision and use experience all descend.

On the other hand, in order to improve the braking performance, the electric scooter generally adopts a built-in brake structure in which a brake pad is embedded in a hub. The brake structure needs to rely on the hub end cover to fix the brake crank, and the crank continuously generates axial inward pressure on the end cover, so that a lining of the end cover is in friction with a bearing, and the friction force is also increased when a rider brakes, so that the abrasion is accelerated.

The bearing wear caused by the above-mentioned various causes a gap between the wheel bearing and other parts to gradually increase, and the wheel is unstably swung in the front and rear forks during running.

Disclosure of Invention

It is therefore an object of the present invention to provide a wheel axle that can accommodate wheel axle wear.

The wheel axle is characterized in that a shaft shoulder is arranged on the shaft body of the wheel axle, the shaft shoulder provides support for the hub bearing on one hand, and the shaft shoulder can prevent the bearing from receiving axial external force of the other side on the other hand.

The wheel axle comprises an axle body and a shaft shoulder on the axle body, wherein the shaft shoulder radially protrudes out of the surface of the axle body;

the first side of the shaft shoulder is abutted against a bearing arranged on the shaft body;

and the second side of the shaft shoulder bears the axial external force, so that the axial external force does not act on the bearing.

In a preferred embodiment, the outward force comprises an axial pressure of the fastener against the hub when the wheel is assembled on the wheel shaft.

In a preferred embodiment, the wheel shoulder is formed as a single piece with the axle body. The integrated piece ensures that no gap exists between the shaft shoulder and the shaft body, and the shaft shoulder and the shaft body cannot shake due to stress, so that no gap exists between the wheel shaft and other parts.

In a preferred technical scheme, the wheel shaft and the shaft body can be separated, and the wheel shaft is provided with the assembling position of the shaft shoulder.

A second aspect of the present invention provides a wheel assembly capable of eliminating a gap between parts such as a wheel bearing;

in addition to the provision of the shaft, a stop element is provided on the outside of the first bearing, i.e. at the end remote from the shoulder, the axial position of which stop element is adjustable, by means of a suitable adjustment of the position of the stop element it being possible to eliminate play in the bearing.

Specifically, a wheel assembly includes:

a wheel shaft;

a wheel hub mounted on the wheel axle;

the wheel hub is pivotally connected to the wheel axle by a first bearing and a second bearing;

the wheel shaft comprises a shaft body and a shaft shoulder on the shaft body, and the shaft part radially protrudes out of the surface of the shaft body;

the first side of the shaft shoulder is abutted against a second bearing arranged on the shaft body;

the second side of the shaft shoulder bears the axial external force, so that the axial external force does not act on the second bearing;

the wheel shaft is provided with an axial stop part at one side close to the first bearing, and the axial stop part is positioned so that the axial stop part can eliminate gaps at two sides of the first bearing and the second bearing.

In a preferred embodiment, the hub includes a first bearing receiving groove and a second bearing receiving groove for receiving the first bearing and the second bearing.

In a preferred technical scheme, a first accommodating groove and a second accommodating groove are formed in an axle center through hole of a hub, and the axle center through hole allows the wheel axle to pass through; the first containing groove and the second containing groove are arranged at two ends of the axle center via hole, and the diameters of the first containing groove and the second containing groove are larger than the axle center via hole.

In a preferred technical scheme, the axial stop member is a nut fixed on one side of the shaft body far away from the shaft shoulder.

In a preferred embodiment, the axial stop comprises a nut and a bushing, and the bushing is mounted on a side of the first bearing away from the shoulder.

In the above scheme, because the second bearing directly contradicts with the shaft shoulder for only need adjust the position of stop piece just can guarantee the bearing clearance disappears, makes the wheel operation more smooth.

The third aspect of the invention improves the problem of bearing wear caused by the drum brake end cover or the shaft sleeve of the wheel. Say and be used for supporting the crank that drum stops the end cover and install and keep away from at the shaft shoulder this side of second bearing makes no matter the brake is under the release state, still under the brake state the shaft shoulder can both support the end cover, guarantees the second bearing atress not to the problem of brake grinding wheel bearing has also been avoided.

In conclusion, the bearing provided by the invention has the advantages that all axial gaps of the inner ring and the outer ring of the bearing are eliminated through the matching of the shaft shoulder and the stop piece, the bearing runs more stably, and the service life is longer. Simultaneously, the brake and the bearing are separated through the shaft shoulder, and the shaft shoulder absorbs the axial force generated by the brake, so that the bearing cannot be influenced by the axial force generated by the brake. Finally, because the bearings are all positioned on the same side of the shaft shoulder, the precision of the bearing assembly is improved.

Drawings

Fig. 1 is a schematic perspective view of a wheel axle.

Fig. 2 is a perspective view of the wheel assembly.

Fig. 3 is an exploded view of the wheel assembly.

Fig. 4 is a schematic cross-sectional view of the wheel assembly.

Detailed Description

The wheel shaft of the present invention may be used widely in electric scooter, electric bicycle, motorcycle and other baby carriage. Including single wheels, two wheels, three wheels, four wheels, etc., as long as the product is matched with a shaft and a bearing.

Referring to the wheel axle shown in FIG. 1, the wheel axle generally includes an axle body 150 and a shoulder 152 on the upper outer peripheral side of the axle body. The shoulder 152 protrudes radially from the surface of the shaft body;

the first side 151 of the shoulder 152 abuts a bearing mounted on the shaft body;

the second side 153 of the shoulder bears the axial force so that it does not act on the bearing.

Concretely, a shaft body

The inside hollow structure that is of axis body 150, the both ends opening of axis body make the inside hollow part of axis body in outside UNICOM, the opening at axis body both ends is interior hexagon, and it can conveniently be dismantled with outer hexagonal spanner cooperation.

The two sides of the shaft body are respectively provided with external threads (refer to fig. 4), the external threads are used for installing fasteners such as fastening nuts, the diameter of the shaft body part where the external threads are located is smaller than that of the shaft body of the middle part, the two ends of the shaft body are provided with outer chamfers r, and the outer chamfers are smaller in diameter and can facilitate the nut to be sleeved on the shaft body when the nut is screwed into the shaft where the external threads are located.

Shaft shoulder

The shoulder 152 is disposed on the outer peripheral side of the shaft body, the shoulder 152 protrudes outward from the shaft body in the radial direction, and the shoulder is disposed on the left side of the center of the shaft body. A bearing 159 (see fig. 3 and 4) is mounted on the left side of the shoulder, and a first side of the shoulder on the left side interferes with the bearing mounted on the shaft, and the shoulder 152 prevents the bearing from moving further to the right and eliminates a gap between the bearing and the shoulder. While the second side 153 on the right side of the shoulder 152 is adapted to bear an axial leftward force, including an axial force on the bearing caused by the axial pressure of the fastener against the hub when the

wheel

126, 133 is mounted on the wheel axle 150, or the self-pressure of the brake crank 163 of the drum brake, or the axial pressure generated by the brake pad or crank during braking, or other conditions.

The shoulder 152 and the shaft body 150 are a unitary or separate piece that can be manufactured using CNC machining or the like. The shoulder 152 and the shaft body 150 may also be separate members, for example, a groove is provided on the shaft body of the shoulder 152, and the shoulder is a C-shaped snap ring clamped in the groove. Use the integrative scheme of shaft shoulder axis body in this application, use integrative shaft shoulder, the shaft shoulder has higher intensity, does not have the fit-up gap simultaneously between shaft shoulder and the axis body and can reduce axial assembly error, has just also further reduced the possibility that assembly error between bearing and the shaft shoulder leads to friction bearing.

Because the shaft shoulder 152 is arranged on one side of the central line of the shaft body, and the bearing is arranged on one side of the shaft shoulder, the shaft shoulder 152 on one hand collides with the bearing 159 so as to promote the elimination of the axial error of the bearing, and the smooth degree of the bearing during rolling is improved. On the other hand, the shaft shoulder bears the axial external force to protect the bearing from the external force, so that the problem of bearing abrasion caused by the external force is avoided, and the service life of the bearing is prolonged.

Wheel assembly

The wheel assembly shown with reference to figures 1 and 4 is formed on the basis of a further modification of the wheel axle of figure 1.

The wheel assembly, in addition to comprising a wheel axle of the same construction as shown in fig. 1, further comprises:

a hub 133 mounted on the wheel shaft;

the hub 133 is pivotally connected to the wheel axle by a first bearing 119 and a second bearing 159;

the wheel axle comprises an axle body 150 and a shoulder 152 on the axle body, the axle member protruding radially from the surface of the axle body;

the first side 151 of the shoulder abuts a second bearing 159 mounted on the shaft;

the second side 153 of the shoulder bears the axial external force, so that the axial external force does not act on the second bearing 159;

the wheel axle is provided with an axial stop 116 on the side thereof adjacent the first bearing 151, the axial stop being positioned so as to eliminate play on either side of the first bearing 151 and the second bearing 116.

The wheel bearings 119,159 are mounted on one side of the shoulder 152 and the axial stop 116 is provided on the other side remote from the shoulder 152 to adjust the axial position of the wheel bearings to eliminate play and improve the running accuracy of the hub. The shoulder 152 protects the bearing on the side near the shoulder from axial pressure reducing wear.

Since the wheel axle 150 in the wheel hub is identical in structure to the wheel axle in fig. 1, only the structure of the wheel hub will be described in detail below.

Hub assembly

The hub generally comprises a hub 132, a rim 133 connected to the hub by a banner 130, and a vacuum tyre 126 arranged outside the rim, the vacuum tyre being provided with air nozzles 128. The hub 132 is hollow, the brake 148 and the wheel axle 150 are installed in the hollow space, and the hub 132 is fixed on the front fork 162 (or the rear fork) through the fixing structures on both sides of the wheel axle.

It should be noted that the hub 132, the rim 133 and the banner 130 are described in this application as being integrally die cast, it being obvious that a person skilled in the art may alternatively assemble the hub, the rim and the banner using different parts.

Hub

The drum 132 described with reference to fig. 3 and 4 includes a drum housing connected to the banner 130, and a shaft receiving portion 134 provided at the center of the drum and connected to the wheel shaft through a bearing. An annular brake accommodating cavity 135 is formed between the hub housing and the shaft accommodating portion 134, and an annular brake friction ring 138 is disposed on the inner wall of the annular cavity. The drum is axially divided into two sides, a first side d1 which is a completely open opening without a housing part and a second side d2 which is a side housing 137. On said first side, a hub end cap 169 is provided, which end cap 169 has a diameter slightly larger than said opening, so that the opening of the hub is closed when the wheel is mounted on the front fork 162.

Axle containing part of hub

With continued reference to fig. 3 and 4, the hub axle receiving portion 134 is disposed at the center of the hub housing 132 and is generally cylindrical, the end d2 of the hub axle receiving portion 133 near the second side of the hub housing is integrally connected to the side housing 137, and a plurality of ribs are disposed on the inner wall of the side housing 137 to connect the hub axle receiving portion and the hub housing. The interior of the hub shaft accommodating part is of a hollow tubular structure, two ends of the hub shaft, namely a first side d and a second side d2 of the hub, are provided with

cavities

131 and 110 for accommodating bearings, the diameters of the

cavities

131 and 110 are larger than that of a hollow tube in the hub shaft, and an axial stop end face of the bearing is formed at the joint of the hollow tube and the bearing cavity.

End cover of hub

The hub end cap 169 is mounted on the shaft body at the side of the shaft shoulder far away from the second bearing 119, the end cap 160 of the hub is used for covering the opening (the position is indicated by 132 in fig. 3) of the hub shell, and the surface of the end cap 169 in the hub is protruded inwards and is approximately arc-shaped; the end cap is centrally provided with a boss 161 extending axially a distance, the length of the boss 161 being greater than the wall thickness of the end cap 169, the boss 161 being adapted for connection to a shaft via a bushing 157. The outer edge of the end cap 169 is provided with a first lip 165 and a second lip 167 arranged radially inwards, and the first lip 165 and the second lip 167 are in concentric ring structures. The open end of the first side of the hub housing is received in the annular groove formed by the first and

second lips

165, 167 when the end cap 169 covers the opening at the first side d1 of the hub.

A slight step end face 102 is formed at the edge of the opening at the first side of the hub shell 132, and the step end face enables the first lip 165 to be partially embedded in the step end 102, so that the hub opening and the end cover 169 are sealed by the step end face 102 and the groove formed by the first lip 165 and the second lip 167; that is, a labyrinth seal is formed between the end cap 169 and the hub opening, which can prevent external rainwater, dust, etc. from entering the hub interior.

The end cap 169 includes a through hole 164, and pipes are formed on the inner and outer walls of the end cap at both sides of the through hole 164, and the through hole 164 serves as a support for receiving the brake crank. The end cap is provided with a blind bore 170, which blind bore 170 extends outwardly from the end cap wall, which end cap wall forms a protruding hollow structure 171 at the location of the blind bore. The crank 163 and the crankshaft 166 of the brake assembly are fixed to the end cap 169 through the through hole 164 and the blind hole.

The outer wall of the end cover 169 is further provided with a connecting groove 168, the connecting groove 168 is in a semicircular structure and is composed of semicircular arms protruding out of the surface of the end cover, a connecting rod is inserted into the connecting groove 168, the other end of the connecting rod is connected with the front fork 162, and the position of the end cover fixed by the connecting rod of the front fork 162 prevents the end cover 169 from rotating when braking, so that braking force is provided.

Brake pad in hub

The brake pads 148 are used by the rider to rub against the friction rings 138 in the hub when braking, thereby resisting wheel rolling 126. The brake block 148 is of two semicircular arc brake block structures, a first end of each arc brake block 138 structure is fixed on the end cover 169 through a connecting shaft 154, the connecting shaft 154 is inserted into the blind hole 170, and a second end 141 of each arc brake block 138 is fixed through a crankshaft 166. The brake plates are connected adjacent the first and second ends by a spring 140, the spring 140 being used to return the brake plate 148 after braking to prevent brake plate friction. When a rider brakes, the crank 163 is pulled by the brake rope, the crank 163 drives the crank 166 to rotate so that the second ends 141 of the two brake pads are separated, the two brake pads 148 radially rotate outwards by taking the connecting shaft 154 as a center, and after the two brake pads 148 rotate for a certain angle, the brake pads 148 contact with the friction ring 136 in the hub to rub to play a braking role. When the rider releases the brake, the brake pads 148 are pulled close by the springs 140, the two brake pads 140 rotate in opposite directions with the connecting shaft as the center, the brake pads 140 are separated from the friction ring, and the braking process is finished.

Friction ring in hub

The inner wall of the hub is provided with a friction ring 138, the inner wall of the friction ring is smooth, the inner wall surface of the friction ring 138 and a brake pad 148 are in friction to form braking force, the outer wall surface of the brake ring is provided with a plurality of annular grooves 136, annular ribs 129 are arranged on the inner wall of the hub at the installation position of the friction ring, and the annular ribs are embedded into the annular grooves 136, so that the axial position of the friction ring 138 is fixed. One end of the friction ring 138, far away from the end cover, is clamped into a friction ring groove 133 arranged in the hub, the end part of the friction ring is provided with a plurality of connecting notches 139, the connecting notches 139 are connected with a lug at the bottom of the friction ring groove, and the notches and the lug are matched to transmit braking force to the hub.

Rim and vacuum tire

On the outside of the rim is mounted a vacuum tire provided with an inflation nozzle 128.

Assembling relation of wheel parts

Referring to fig. 2 and 3, the front fork and hub are secured to a wheel axle 150. The right fork arm and the left fork arm of the front fork are sleeved at two ends of an axle and are fixed through

fastening bolts

158 and 115, and fastening flanges are arranged on the end faces of the

fastening bolts

158 and 115, which are in contact with the fork arms, to prevent the fork arms from loosening. The right yoke is provided with a sizing bushing 155 on the inside, the primary purpose of the sizing bushing 155 being to adjust the axial dimension so that the width of the yoke matches the length of the wheel axle 150.

An end cover bushing 157 is arranged on the inner side of the size adjusting bushing 155, the end cover is sleeved and fixed on the bushing 157 of the end cover 169, meanwhile, the inner end face of the end cover bushing 155 is abutted against the second end face 153 of the shaft shoulder of the wheel shaft, the radial height of the shaft shoulder is larger than the inner diameter of the end cover bushing 155, and therefore the force on the right side of the shaft shoulder 152 is offset by the shaft shoulder. The external force borne by the shaft shoulder mainly comprises an axial pressing force generated by the right fork arm fixing nut 158 and an axial component generated by the end cover 169 when the brake crank 163 is fixed on the end cover 169 and the rear end cover is stressed and deflected, wherein the axial component is increased along with the addition of a braking force and the like during braking due to the existence of the braking force. The bearing fixed inside the shoulder 152 is not worn by external forces due to the axial force counteracting action of the shoulder.

On the left side of the hub is mounted a first bearing 159, which is mounted in a first bearing receiving groove 131 of a bearing receiving portion, and a corresponding second bearing 119, which is provided on the second side d2 of the hub, is provided in a second bearing receiving groove 110. The first and second receiving

grooves

131 and 110 are formed in an axial center through hole of the hub, which allows the wheel axle 150 to pass through; the first receiving groove 131 and the second receiving groove 110 are located at two ends of the axis via hole, and the diameters of the first receiving groove 131 and the second receiving groove 110 are larger than the via hole. An end cap bushing 118 is arranged outside the second bearing, a tapered end cap 117 is arranged outside the end cap bushing 118, and the end cap 117 is used for protecting the bearing from external dust, impurities and the like entering the bearing.

The left side of the end cap bushing 118 is provided with a gap adjusting nut 116, when the gap adjusting nut 116 is screwed, one end of the bushing is abutted against the shaft shoulder far away from the second bearing, and a gap between the end cap bushing 118 and the second bearing 119 disappears, so that the wheel is kept to rotate smoothly without noise or shake. The clearance adjusting nut 116 is two independent nuts which simultaneously use the compression between the outer nut and the inner nut to prevent the loosening and the displacement. It is obvious that other equivalent solutions may be used by those skilled in the art, and that an axial clearance adjustment device is provided and fixed on the shaft body on the side away from the shoulder.

Claims

1. The wheel axle, its characterized in that:

the shaft comprises a shaft body and a shaft shoulder on the shaft body, wherein the shaft shoulder radially protrudes out of the surface of the shaft body;

2. The wheel axle of claim 1 wherein said outward force comprises axial compression of the fastener against the hub when the wheel is assembled on the wheel axle.

3. The wheel axle of claim 1, wherein the shoulder is integral with the body.

4. A wheel assembly, comprising:

a wheel shaft;

a wheel hub mounted on the wheel axle;

the wheel shaft comprises a shaft body and a shaft shoulder on the shaft body, and the shaft shoulder radially protrudes out of the surface of the shaft body;

and an axial stop part is arranged on one side of the wheel shaft close to the first bearing, and the position of the axial stop part is adjusted, so that the clearance between the two sides of the first bearing and the second bearing can be eliminated.

5. The wheel assembly of claim 4, wherein the hub includes bearing first and second pockets that receive the first and second bearings.

6. The wheel assembly of claim 4, wherein the first and second receiving slots are formed in an axle center via of the hub, the axle center via allowing passage of the wheel axle; the first containing groove and the second containing groove are arranged at two ends of the axle center via hole, and the diameters of the first containing groove and the second containing groove are larger than the axle center via hole.

7. The wheel assembly of claim 4, wherein the axial stop member is a nut secured to the axle body on a side thereof remote from the shoulder.

8. The wheel assembly of claim 4, wherein the axial stop includes a nut and a bushing mounted on a side of the first bearing remote from the shoulder.

9. The wheel assembly of claim 4, including a brake assembly including a brake pad disposed inside the hub and a crank disposed outside the hub, the crank being connected to the brake pad by a crank shaft; the crankshaft is fixed in the through hole of the end cover of the hub, and the end cover of the hub is installed on the shaft body on the side, away from the second bearing, of the shaft shoulder.

10. The wheel assembly of claim 9, wherein the end cap is disposed over a bushing disposed over the axle body, the bushing having an end abutting a side of the shoulder remote from the second bearing.