CN111391136A

CN111391136A - Riding wheel device and agitating lorry

Info

Publication number: CN111391136A
Application number: CN202010275569.4A
Authority: CN
Inventors: 张国君; 左金玉; 陈健晖
Original assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Current assignee: Zoomlion Heavy Industry Science and Technology Co Ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-07-10

Abstract

The invention relates to the field of engineering machinery and discloses a supporting wheel device and a stirring vehicle. The riding wheel device comprises a riding wheel shaft, a bearing sleeved outside the riding wheel shaft, a riding wheel sleeved outside the bearing, and two bearing end covers sleeved outside the riding wheel shaft and respectively located at two ends of the bearing. According to the riding wheel device, the sealing ring is arranged between the bearing and the bearing end cover, the sealing ring can directly seal the area between the inner lining and the outer sleeve of the bearing, and bearing lubricating grease is effectively prevented from leaking, so that the riding wheel device only needs one-time oil injection during installation, and the bearing can be free of maintenance for the whole life.

Description

Riding wheel device and agitating lorry

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a riding wheel device and a stirring vehicle comprising the riding wheel device.

Background

In concrete mixer trucks, the front end of the concrete mixing drum is typically fixedly supported on the trailer chassis by a riding wheel assembly that rotates with the concrete mixing drum.

As shown in fig. 1, a riding wheel device used in a current concrete mixing and transporting vehicle includes a riding wheel shaft 11 ', a bearing 12 ', a riding wheel 13 ' and a bracket 16 ', the riding wheel shaft 11 ' is fixedly mounted on the bracket 16 ', the riding wheel 13 ' is rotatably mounted on the riding wheel shaft 11 ' through the bearing 12 ', both axial ends of the bearing 12 ' are respectively provided with a bearing end cover 14 ' and an oil seal 17 ', one end of the riding wheel shaft 11 ' is provided with a nut 18 ' capable of locking the riding wheel shaft 11 ', and the other end is provided with an oil passage 111 ' and an oil cup 112 '.

In the above-mentioned riding wheel device 10 ', because the sealing effect of the oil seal 17' is limited, bearing grease leakage often occurs in the use process, and grease needs to be injected into the bearing 12 'through the oil cup 112' periodically for maintenance, so that the use cost is high, and time and labor are wasted. Furthermore, dust in the external environment and water washing the agitating drum easily enter the bearing to affect the use of the bearing.

Disclosure of Invention

The invention aims to solve the problems and provides a riding wheel device and a mixer truck comprising the riding wheel device.

In order to achieve the above object, in one aspect, the present invention provides a roller device, which includes a roller shaft, a bearing sleeved outside the roller shaft, a roller sleeved outside the bearing, and two bearing end caps sleeved outside the roller shaft and located at two ends of the bearing, respectively, and the roller device further includes a first sealing structure, where the first sealing structure includes two sealing rings, the two sealing rings are sleeved outside the roller shaft and located at two ends of the bearing, respectively, and each sealing ring is located between the bearing and the corresponding bearing end cap in an axial direction of the roller shaft to seal an area between a liner and an outer sleeve of the bearing.

Optionally, one of the inner and outer peripheral edges of the sealing ring is formed as a fixed end and the other is formed as a free end, wherein:

the fixed end is fixed on one side of the lining, and the end part of the free end is tightly propped against the corresponding end surface of the outer sleeve or the inner circumferential surface of the riding wheel; or

The fixed end is fixed on one side of the outer sleeve, and the end part of the free end is tightly propped against the corresponding end surface of the lining.

Optionally, the fixed end is clamped between the corresponding end surface of the liner and the inner end surface of the bearing end cover, or the fixed end is clamped between the corresponding end surface of the outer sleeve and the inner circumferential surface of the riding wheel.

Optionally, the free end is formed into a bent shape that enables an end thereof to be always abutted against a corresponding end surface of the jacket, a corresponding end surface of the liner, or an inner circumferential surface of the idler.

Optionally, the seal ring has a plurality of the free ends, and the free ends are abutted at intervals in a radial direction of the seal ring.

Optionally, the seal ring is made of a metallic material and/or the bearing comprises two tapered roller bearings arranged oppositely.

Optionally, the idler arrangement comprises a bracket on which the idler shaft is mounted; and/or

The riding wheel device comprises a second sealing structure which is arranged to form a seal for the area between the bearing end cover and the riding wheel.

Optionally, the second sealing structure comprises two oil seals respectively mounted on the inner sides of the two bearing end covers.

The invention also provides a mixing truck which comprises a mixing drum, an annular track arranged outside the mixing drum and the riding wheel device, wherein the riding wheel device is supported on the annular track and enables the riding wheel to be matched with the annular track.

Optionally, the annular track has an angle β between the axial direction and the horizontal direction, the angle β is 0-90 degrees, and/or

The ratio of the outer diameter R1 of the riding wheel to the outer diameter R2 of the annular track is 0.05-0.5.

According to the technical scheme, the sealing ring is arranged between the bearing and the bearing end cover, the sealing ring can directly seal the area between the inner lining and the outer sleeve of the bearing, and bearing lubricating grease is effectively prevented from leaking, so that the riding wheel device only needs to be filled with oil once during installation, holes do not need to be drilled on the riding wheel shaft to regularly fill lubricating grease into the bearing, the bearing can be free of maintenance for the whole life, and the preparation cost and the use cost of the riding wheel device are reduced.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic diagram of a prior art riding wheel assembly;

FIG. 2 is a schematic structural view of a first embodiment of the riding wheel assembly of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic structural view of a second embodiment of the riding wheel assembly of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is a schematic structural view of a third embodiment of the riding wheel assembly of the present invention;

FIG. 7 is a schematic structural view of a fourth embodiment of the idler assembly of the present invention showing only the idler shaft, bearings, idler, bearing end caps, first seal structure, and second seal structure;

FIG. 8 is a schematic view of the mixing drum, the endless track, and the riding wheel assembly of the mixing truck of the present invention after assembly;

fig. 9 is a schematic view of the inventive idler assembly supported on an endless track.

Description of the reference numerals

10-riding wheel device, 11-riding wheel shaft, 12-bearing, 121-lining, 122-outer sleeve, 13-riding wheel, 131-flange, 132-matching surface, 133-abutting surface, 14-bearing end cover, 15-sealing ring, 151-fixed end, 152-free end, 16-bracket, 161-upright post, 162-base, 17-oil seal, 18-nut, 19-bearing lubricating cavity, 20-stirring barrel and 21-annular track.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, the terms "both ends" and "both sides" used herein refer to both ends and both sides along the axial direction of the idler shaft 11, unless otherwise specified; the terms "inner" and "outer" as used herein refer to the central axis being inner, proximal to the idler shaft 11, and outer, distal from the idler shaft 11.

The invention provides a riding wheel device 10 which comprises a riding wheel shaft 11, a bearing 12 sleeved outside the riding wheel shaft 11, a riding wheel 13 sleeved outside the bearing 12, two bearing end covers 14 sleeved outside the riding wheel shaft 11 and respectively positioned at two ends of the bearing 12, wherein the riding wheel device 10 further comprises a first sealing structure, the first sealing structure comprises two sealing rings 15, the two sealing rings 15 are sleeved outside the riding wheel shaft 11 and respectively positioned at two ends of the bearing 12, and each sealing ring 15 is positioned between the bearing 12 and the corresponding bearing end cover 14 in the axial direction of the riding wheel shaft 11 so as to seal an area between a lining 121 and an outer sleeve 122 of the bearing 12. That is, as shown in fig. 2, the left seal ring 15 is located between the left bearing end cap 14 and the left end of the bearing 12, and the right seal ring 15 is located between the right bearing end cap 14 and the right end of the bearing 12.

It should be noted that the sealing ring 15 is located between the bearing 12 and the bearing end cap 14, which means that the sealing ring 15 is located directly adjacent to the bearing 12, thereby sealing the bearing 12 well.

According to the riding wheel device 10, the sealing ring 15 is arranged between the bearing 12 and the bearing end cover 14, the sealing ring 15 can directly seal the area between the lining 121 and the outer sleeve 122 of the bearing 12, and bearing lubricating grease leakage is effectively avoided, so that the riding wheel device 10 only needs to be filled with oil once during installation, holes do not need to be drilled on the riding wheel shaft 11 to regularly fill lubricating grease into the bearing, the bearing 12 can be free of maintenance for the whole life, and the preparation cost and the use cost of the riding wheel device 10 are reduced.

In the present invention, the seal ring 15 may be installed in any suitable manner as long as it can seal the region between the liner 121 and the outer sleeve 122 of the bearing 12.

The sealing ring 15 includes an inner circumferential edge (i.e., an annular portion near the idler shaft 11) and an outer circumferential edge (i.e., an annular portion near the idler 13) connected along a radial direction thereof, and according to an embodiment of the present invention, one of the inner and outer circumferential edges of the sealing ring 15 may be formed as a fixed end 151 and the other as a free end 152. It will be appreciated that the fixed end 151 is fixedly attached and the free end 152 is not fixedly attached. The fixed end 151 may be fixed to the side of the inner liner 121, and the end of the free end 152 may be tightly abutted to the corresponding end surface of the outer casing 122 (i.e., the free end 152 of the left sealing ring 15 is tightly abutted to the left end surface of the outer casing 122, and the free end 152 of the right sealing ring 15 is tightly abutted to the right end surface of the outer casing 122) or the inner circumferential surface of the idler 13; alternatively, the fixed end 151 may be fixed to the side of the outer sleeve 122, and the end of the free end 152 may be pressed against the corresponding end surface of the lining 121 (i.e., the free end 152 of the left sealing ring 15 is pressed against the left end surface of the lining 121, and the free end 152 of the right sealing ring 15 is pressed against the right end surface of the lining 121). That is, the abutment of the fixed and free ends 152 of the fixed end 151 causes the seal ring 15 to cover the area between the inner lining 121 and the outer jacket 122 of the bearing 12. It should be noted that the fixed connection of the fixed end 151 is not particularly limited to a non-detachable fixed connection manner such as welding, and only needs to fix the fixed end 151, such as a detachable manner in which a bearing end cover, a tug, and a bearing are matched and pressed, and the like, used in the embodiment of the present invention.

Specifically, referring to the embodiment shown in fig. 2 and 3, the fixed end 151 is sandwiched between the respective end surface of the liner 121 and the inner end surface of the bearing end cap 14, and the end of the free end 152 is tightly abutted against the respective end surface of the outer sleeve 122. Referring to the embodiment of the seal ring 15 on the left side in fig. 6, the fixed end 151 is sandwiched between the corresponding end surface of the outer sleeve 122 and the inner circumferential surface of the idler 13, and the end of the free end 152 abuts against the corresponding end surface of the liner 121. It should be noted that, in the axial direction of the idler shaft 11, one end of the bearing end cover 14 close to the bearing 12 is inner, and the other end away from the bearing 12 is outer. In addition, in order to facilitate the clamping of the fixed end 151, the inner circumferential surface of the idler 13 may be formed with a matching surface 132, the matching surface 132 may be parallel to the end surface of the outer sleeve 122, and the matching surface 132 may also limit the bearing 12.

In the above, since the free end 152 is sealed by abutting, in order to ensure that the free end 152 always abuts, the seal ring 15 is preferably made of a material having a high strength and hardness, for example, the seal ring 15 may be a metal seal ring, in which case, the fixing reliability of the fixed end 151 may be ensured, and in the case where the end of the free end 152 abutting against the end surface or the inner peripheral surface is rubbed against the end surface or the inner peripheral surface along with the rotation of the idler 13, a shallow groove may be rubbed against the end surface or the inner peripheral surface and fitted into the shallow groove, so that the end surface or the inner peripheral surface, the shallow groove, and the seal ring form a sealed sealing region, which may effectively prevent the loss of grease and the intrusion of external contaminants. More preferably, the end of the free end 152 may be formed in a relatively sharp shape to facilitate formation of the shallow groove.

In order to facilitate the contact between the end of the free end 152 and the inner circumferential surface of the idler 13, as shown in fig. 5 and 6, a contact surface 133 may be provided on the inner circumferential surface of the idler 13. The abutment surface 133 may extend in a direction perpendicular to the axial direction of the idler shaft 11.

In order to ensure that the end of the free end 152 can always be brought into close contact with the end of the jacket 122, the end of the liner 121, or the contact surface 133, as shown in fig. 3 and 5, the free end 152 may be bent so that the end can always be brought into close contact with the end surface of the jacket 122, the end surface of the liner 121, or the contact surface 133. This bend can facilitate deformation of the free end 152 and provide a force to the end of the free end 152 toward the face it abuts. As shown in fig. 2-7, the end of the free end 152 may abut against the end surface of the sheath 122, the end surface of the liner 121, or the abutment surface 133 along the axial direction of the idler shaft 11, and the end surface of the sheath 122, the end surface of the liner 121, and the abutment surface 133 are perpendicular to the axial direction of the idler shaft 11. The shape and the bent shape of the seal ring 15 are not limited to those shown in the drawings, and may be other shapes.

In the present invention, in order to further improve the sealing effect, the seal ring 15 may have a plurality of free ends 152, and the plurality of free ends 152 may abut against each other at intervals in the radial direction of the seal ring 15. Theoretically, the more free ends 152, the better the sealing effect. For example, in the embodiment shown in fig. 4 and 5, the sealing ring 15 includes a fixed end 151 sandwiched between the corresponding end surface of the lining 121 and the inner end surface of the bearing end cap 14, and two free ends 152 connected to the fixed end 151, wherein an end of one of the free ends 152 abuts against the corresponding end surface of the outer sleeve 122, and an end of the other free end 152 abuts against the abutting surface 133.

It should be noted that the two seal rings 15 in the present invention may have the same structure (for example, as shown in fig. 2, 4 and 7, both seal rings 15 have one free end 152) or different structures (for example, as shown in fig. 6, the left side seal ring 15 has one free end 152, and the right side seal ring 15 has two free ends 152); the same mounting method may be adopted (for example, as shown in fig. 2, 4 and 7, the fixed ends 151 of the two seal rings 15 are both sandwiched between the corresponding end surface of the lining 121 and the inner end surface of the bearing end cover 14), or different mounting methods may be adopted (for example, as shown in fig. 6, the fixed end 151 of the left seal ring 15 is sandwiched between the left end surface of the outer sleeve 122 and the inner circumferential surface of the idler 13, and the fixed end 151 of the right seal ring 15 is sandwiched between the right end surface of the lining 121 and the inner end surface of the bearing end cover 14).

In the present invention, in order to further improve the sealing effect, the idler device 10 may further include a second sealing structure configured to seal the region between the bearing end cover 14 and the idler 13. The second sealing structure can carry out coarse filtration to external dust, water and the like. Specifically, the second seal structure may include two oil seals 17 mounted on the inner sides of the two bearing end caps 14, respectively, as shown in fig. 2 to 7, for example. That is to say, compare with only installing two oil blanket 17' among the prior art, this application has additionally established first seal structure, can realize double seal. Of course, in the present invention, the second sealing structure is not limited to the existing common oil seal, but a metal sealing ring similar to the first sealing structure may be used, or the diameter of the outer end surface of the bearing end cover 14 may be increased to reduce the gap between the bearing end cover 14 and the idler 13.

In the present invention, the bearing 12 may be any suitable type of bearing, such as two tapered roller bearings mounted back-to-back (as shown in fig. 2 and 4), one tapered roller bearing (as shown in fig. 6), and a deep groove ball bearing (as shown in fig. 7).

Other configurations of the idler assembly 10 of the present invention will be described in detail below with reference to fig. 2.

As shown in fig. 2, the riding wheel device 10 further includes a support 16, the support 16 includes a base 162 and two columns 161 extending vertically and upwardly from the left and right ends of the base 162, the two columns 161 are respectively provided with a mounting hole for mounting the riding wheel shaft 11, and the left end of the riding wheel shaft 11 sequentially passes through the two mounting holes and is locked by a nut 18 to realize fixation. Two tapered roller bearings arranged back to back are sleeved on the idler shaft 11, the idler 13 is sleeved outside the two tapered roller bearings, an annular flange 131 is formed on the inner circumferential surface of the idler 13 along the circumferential direction of the inner circumferential surface, the flange 131 is limited between the two tapered roller bearings so as to form a bearing lubricating cavity 19 between the two tapered roller bearings, and long-acting lubricating grease can be injected into the bearing lubricating cavity 19. Two bearing end covers 14 are respectively pressed on the left end and the right end of the bearing 12. The bearing 12, the two bearing end caps 14 and the idler 13 are located between the two columns 161 of the bracket 16.

In the invention, in order to realize the maintenance-free of the whole riding wheel device 10, the riding wheel 13 can be subjected to surface treatment modes such as tempering, chromium plating and the like in the manufacturing process of the riding wheel 13 so as to increase the strength and the wear resistance, thereby ensuring that the riding wheel 13 has the same service life as the bearing 12.

The riding wheel apparatus 10 of the present invention may be used in any suitable construction machine, such as a concrete mixer truck, a wet mixer in a machine-made sand production line, a belt conveyor, and the like. In addition, the riding wheel device 10 of the invention is particularly suitable for the working conditions of heavy load bearing and large dynamic load bearing.

The invention provides a mixer truck, which comprises a mixing drum 20, an annular rail 21 arranged outside the mixing drum 20 and a riding wheel device 10, wherein the riding wheel device 10 is supported on the annular rail 21 and enables a riding wheel 13 to be matched with the annular rail 21.

In order to ensure the efficient operation of the mixing drum 20, as shown in fig. 8, an included angle β may be formed between the axial direction and the horizontal direction of the circular track 21, the included angle β is 0 to 90 °, and as shown in fig. 9, the ratio of the outer diameter R1 of the idler 13 to the outer diameter R2 of the circular track 21 may be 0.05 to 0.5.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. A riding wheel device (10) comprises a riding wheel shaft (11), a bearing (12) sleeved outside the riding wheel shaft (11), a riding wheel (13) sleeved outside the bearing (12) and two bearing end covers (14) sleeved outside the riding wheel shaft (11) and respectively positioned at two ends of the bearing (12), the supporting roller device (10) is characterized by further comprising a first sealing structure, the first sealing structure comprises two sealing rings (15), the two sealing rings (15) are sleeved outside the supporting roller shaft (11) and are respectively arranged at two ends of the bearing (12), and each sealing ring (15) is located between the bearing (12) and the corresponding bearing end cover (14) in the axial direction of the supporting roller shaft (11) to seal an area between the lining (121) and the outer sleeve (122) of the bearing (12).

2. The idler assembly of claim 1,

one of an inner peripheral edge and an outer peripheral edge of the seal ring (15) is formed as a fixed end (151) and the other is formed as a free end (152), wherein:

the fixed end (151) is fixed on one side of the outer sleeve (122), and the end part of the free end (152) is tightly pressed against the corresponding end surface of the lining (121); or

The fixed end (151) is fixed on one side of the lining (121), and the end part of the free end (152) is tightly abutted against the corresponding end surface of the outer sleeve (122) or the inner circumferential surface of the riding wheel (13).

3. Idler device according to claim 2, wherein the fixed end (151) is sandwiched between a respective end face of the inner lining (121) and an inner end face of the bearing end cap (14), or the fixed end (151) is sandwiched between a respective end face of the outer sleeve (122) and an inner circumferential face of the idler (13).

4. Idler assembly according to claim 2, characterised in that the free end (152) is formed as a bend enabling its end to be always pressed against a corresponding end surface of the outer sleeve (122), a corresponding end surface of the lining (121) or the inner circumferential surface of the idler (13).

5. Idler device according to claim 2, wherein the sealing ring (15) has a plurality of said free ends (152), said free ends (152) abutting each other in a radial direction of the sealing ring (15) at a mutual distance.

6. The idler assembly according to any one of claims 1-5,

the sealing ring (15) is made of a metal material, and/or

The bearing (12) comprises two conical roller bearings which are oppositely arranged.

7. The idler assembly according to any one of claims 1-5,

the riding wheel device (10) comprises a bracket (16), and the riding wheel shaft (11) is arranged on the bracket (16); and/or

The idler arrangement (10) comprises a second sealing arrangement arranged to form a seal to a region between the bearing end cap (14) and the idler (13).

8. The idler assembly of claim 7 wherein said second sealing arrangement includes two oil seals (17) mounted on the inner sides of two of said bearing end caps (14), respectively.

9. Truck mixer, characterized in that it comprises a mixing drum (20), an endless track (21) mounted outside said mixing drum (20) and an idler device (10) according to any one of claims 1-8, said idler device (10) being supported on said endless track (21) and engaging said idler (13) with said endless track (21).

10. Truck mixer as in claim 9, characterized in that said annular track (21) has an angle β between the axial and horizontal directions, this angle β being between 0 and 90 °, and/or in that the ratio of the outer diameter R1 of said idler (13) to the outer diameter R2 of said annular track (21) is between 0.05 and 0.5.