阅读说明：本技术 一种轮毂轴承单元 (Hub bearing unit ) 是由 王峰 常方坡 刘海林 于 2021-08-30 设计创作，主要内容包括：本发明公开了一种轮毂轴承单元,包括轮毂以及行星架,轮毂外部套接有壳体,轮毂通过轴承部与壳体转动连接,行星架与轮毂之间设有调整垫；轮毂包括轮毂主体,轮毂主体靠近壳体的一端固定连接有用于安装轴承部的轴承安装轴肩,轴承安装轴肩外侧的轮毂主体的半径大于轴承安装轴肩的半径,轮毂主体在轴承安装轴肩的外侧形成有第一定位端面,轴承部位于第一定位端面内侧,本申请通过设置用于安装轴承的轴肩,并且在轮毂上设置定位面,轮毂、第一轴承、壳体、第二轴承配合后,可直接测量轮毂内端面到第二轴承内圈大端面的距离D,测量简便快捷,无需测量过多的零部件尺寸进行计算转换,轮毂轴承的设计游隙有较准确和直观的可读性。(The invention discloses a hub bearing unit, which comprises a hub and a planet carrier, wherein a shell is sleeved outside the hub, the hub is rotatably connected with the shell through a bearing part, and an adjusting pad is arranged between the planet carrier and the hub; wheel hub includes the wheel hub main part, the one end fixedly connected with that the wheel hub main part is close to the casing is used for installing the bearing installation shoulder of bearing portion, the radius of the wheel hub main part in the bearing installation shoulder outside is greater than the radius of bearing installation shoulder, the wheel hub main part is formed with first location terminal surface in the outside of bearing installation shoulder, bearing portion is located first location terminal surface inboard, this application is used for installing the shaft shoulder of bearing through setting up, and set up the locating surface on wheel hub, first bearing, a housing, second bearing cooperation back, but the distance D of terminal surface to the big terminal surface of second bearing inner circle in the direct measurement wheel hub, it is simple and fast to measure, need not to measure too much spare part size and calculate the conversion, the design play of wheel hub bearing has more accurate and audio-visual readability.)

1. A hub bearing unit comprises a hub (2) and a planet carrier (7) fixedly connected with the hub (2), and is characterized in that a shell (4) is sleeved outside the hub (2), the hub (2) is rotatably connected with the shell (4) through a bearing portion, and an adjusting pad (6) is arranged between the planet carrier (7) and the hub (2);

the hub (2) comprises a hub main body (21), one end, close to the shell (4), of the hub main body (21) is fixedly connected with a bearing installation shaft shoulder (24) used for installing the bearing portion, the radius of the hub main body (21) on the outer side of the bearing installation shaft shoulder (24) is larger than that of the bearing installation shaft shoulder (24), a first positioning end face (25) is formed on the outer side of the bearing installation shaft shoulder (24) of the hub main body (21), and the bearing portion is located on the inner side of the first positioning end face (25);

and a clamping groove for mounting the bearing part is formed in the shell (4).

2. A hub bearing unit according to claim 1, wherein the bearing portion comprises a first bearing (3) and a second bearing (5), and the first bearing (3) and the second bearing (5) are both tapered roller bearings.

3. A hub bearing unit according to claim 2, wherein the bearing mounting shoulders (24) are of a reducing cylinder structure, and the first bearing (3) and the second bearing (5) are mounted on the bearing mounting shoulders (24) with different radii.

4. A hub bearing unit according to claim 2, wherein the housing (4) comprises a housing main body (41), the housing main body (41) protrudes inwards to form a flange (42) with an annular structure, a first bearing clamping groove (43) and a second bearing clamping groove (44) are arranged on two sides of the flange (42), the first bearing (3) is clamped in the first bearing clamping groove (43), and the second bearing (5) is clamped in the second bearing clamping groove (44).

5. A hub bearing unit according to claim 1, wherein a hub inner end surface (23) is provided inside the hub main body (21), the hub inner end surface (23) being arranged in parallel with the first positioning end surface (25).

6. A hub bearing unit according to claim 5, wherein the planet carrier (7) is provided with a second positioning end surface (71), the second positioning end surface (71) is in contact connection with the inner hub end surface (23), the adjusting pad (6) is sleeved on the hub main body (21), and the adjusting pad (6) is located between the second positioning end surface (71) and the bearing portion.

7. A hub bearing unit according to claim 1, wherein the planet carrier (7) is plugged into the hub body (21), and the outer end of the planet carrier (7) is fixedly connected with the hub body (21) by means of a lock nut (1).

8. A hub bearing unit according to claim 7, wherein the hub main body (21) is provided with a hub outer end surface (22) on the outer side, a protective end cover is detachably connected to the outer side of the hub outer end surface (22), and the lock nut (1) is located on the inner side of the protective end cover.

9. A hub bearing unit according to claim 2, wherein the inner races of the first and second bearings (3, 5) are in interference fit connection with the bearing mounting shoulders (24), and the outer races of the first and second bearings (3, 5) are in clearance fit connection with the housing (4).

10. A hub bearing unit according to claim 2, wherein the second bearing (5) is located inside the first bearing (3), the outside of the first bearing snap groove (43) is of open structure, and the inside of the second bearing snap groove (44) is of open structure.

Technical Field

The invention relates to the technical field of hub bearings, in particular to a hub bearing unit.

Background

The hub bearing is an important part in a forklift running system. The hub bearings used in current forklifts are usually pairs of tapered roller bearings (hereinafter referred to as bearings). The mounting, lubrication, play adjustment, etc. of the bearing all have a significant effect on the performance of the bearing. The play of the bearing is one of the key factors affecting the performance of the bearing. When the bearing is assembled, the bearing needs to be pre-tightened by a pre-tightening device, and the size of a clearance after pre-tightening has great influence on the actual deformation, the supporting rigidity and the rotation precision of the bearing. Too large a play causes abnormal vibrations of the bearing, and too small a play causes increased contact stress and frictional resistance in the bearing, resulting in a reduced bearing life.

The existing forklift hub bearing clearance adjustment method adopts experience pretension installation to adjust the clearance, namely an assembler manually operates a disc hub and judges the suitability of the designed clearance according to experience; or measuring the sizes of multiple groups of parts, and determining the thickness of the adjusting sheet required to be installed through multiple calculation and conversion so as to meet the required design clearance. The former needs to loosen and tighten the locking structure repeatedly for many times and can not ensure the consistency of products; the latter is time-consuming to assemble, even partially dimensioned, due to structural constraints, cannot be measured directly by conventional means, without relatively accurate and intuitive readability.

Disclosure of Invention

The present invention is directed to a hub bearing unit to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

a hub bearing unit comprises a hub and a planet carrier fixedly connected with the hub, wherein a shell is sleeved outside the hub, the hub is rotatably connected with the shell through a bearing part, and an adjusting pad is arranged between the planet carrier and the hub;

the hub comprises a hub main body, one end of the hub main body, which is close to the shell, is fixedly connected with a bearing installation shaft shoulder used for installing the bearing part, the radius of the hub main body outside the bearing installation shaft shoulder is larger than that of the bearing installation shaft shoulder, the hub main body is provided with a first positioning end surface outside the bearing installation shaft shoulder, and the bearing part is positioned on the inner side of the first positioning end surface;

the shell is internally provided with a clamping groove used for installing the bearing part.

As a further scheme of the invention: the bearing part comprises a first bearing and a second bearing, and the first bearing and the second bearing are both tapered roller bearings.

As a further scheme of the invention: the bearing mounting shaft shoulder is of a reducing cylinder structure, and the first bearing and the second bearing are mounted on the bearing mounting shaft shoulders with different radiuses.

As a further scheme of the invention: the casing includes the casing main part, the inside arch of casing main part forms the flange of annular structure, the flange both sides are equipped with first bearing joint groove, second bearing joint groove, first bearing joint in first bearing joint inslot, the second bearing joint in second bearing joint inslot.

As a further scheme of the invention: the inner side of the hub main body is provided with a hub inner end face, and the hub inner end face and the first positioning end face are arranged in parallel.

As a further scheme of the invention: the planet carrier is provided with a second positioning end face, the second positioning end face is in contact connection with the inner end face of the hub, the adjusting pad is sleeved on the hub main body, and the adjusting pad is located between the second positioning end face and the bearing portion.

As a further scheme of the invention: the planet carrier is inserted in the hub main body, and the outer end of the planet carrier is fixedly connected with the hub main body through a locking nut.

As a further scheme of the invention: the outer side of the hub main body is provided with an outer end face of the hub, the outer end face of the hub is detachably connected with a protection end cover, and the locking nut is located on the inner side of the protection end cover.

As a further scheme of the invention: the inner rings of the first bearing and the second bearing are connected with the bearing mounting shaft shoulder in an interference fit mode, and the outer rings of the first bearing and the second bearing are connected with the shell in a clearance fit mode.

As a further scheme of the invention: the second bearing is located on the inner side of the first bearing, the outer side of the first bearing clamping groove is of an open structure, and the inner side of the second bearing clamping groove is of an open structure.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the measuring method, the shaft shoulder for mounting the bearing is arranged, the positioning surface is arranged on the hub, and after the hub, the first bearing, the shell and the second bearing are matched, the distance D from the inner end surface of the hub to the large end surface of the inner ring of the second bearing can be directly measured, the measurement is simple, convenient and quick, the size of excessive parts does not need to be measured for calculation and conversion, and the design clearance of the hub bearing is accurate and visual;

2. this application adjusting pad assembly back between second bearing and planet carrier, lock nut produces sufficient pretightning force and compresses tightly the laminating with planet carrier and wheel hub, need not adjust lock nut's elasticity degree repeatedly this moment, just obtains the required bearing play of design, and the bearing play has higher uniformity.

Drawings

FIG. 1 is a front sectional view of the present embodiment;

FIG. 2 is an enlarged view of the portion I in FIG. 1;

fig. 3 and 4 are schematic diagrams of the measured D value in the present embodiment.

In the figure:

1-locking a nut;

2-a hub, 21-a hub main body, 22-an outer end face of the hub, 23-an inner end face of the hub, 24-a bearing mounting shaft shoulder and 25-a first positioning end face;

3-a first bearing;

4-shell, 41-shell body, 42-flange, 43-first bearing clamping groove, 44-second bearing clamping groove;

5-second bearing, 6-adjusting pad, 7-planet carrier, 71-second positioning end face.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-4, in an embodiment of the present invention, a hub bearing unit includes a hub 2, a housing 4 is sleeved outside the hub 2, the hub 2 is rotatably connected to the housing 4 through a bearing portion, the bearing portion includes a first bearing 3 and a second bearing 5, both the first bearing 3 and the second bearing 5 are tapered roller bearings, the hub 2 includes a hub main body 21, one end of the hub main body 21 near the housing 4 is fixedly connected to a bearing mounting shoulder 24 for mounting the bearing portion, the bearing mounting shoulder 24 is a reducing cylinder structure, the first bearing 3 and the second bearing 5 are mounted on bearing mounting shoulders 24 with different radii, the radius of the hub main body 21 outside the bearing mounting shoulder 24 is greater than the radius of the bearing mounting shoulder 24, so that the hub main body 21 forms a first positioning end surface 25 outside the bearing mounting shoulder 24, the first bearing 3 is located inside the first positioning end surface 25, the outer side surface of the first bearing 3 is positioned through the first positioning end surface 25, the inner side of the hub main body 21 is provided with the inner hub end surface 23, the inner hub end surface 23 is arranged in parallel with the first positioning end surface 25, the hub main body 21 is connected with the planet carrier 7, the hub main body 21 is driven to rotate through the planet carrier 7, the planet carrier 7 is inserted into the hub main body 21, the planet carrier 7 is in spline fit with the hub main body 21, the outer end of the planet carrier 7 is fixedly connected with the hub main body 21 through the locking nut 1, the outer hub end surface 22 is arranged on the outer side of the hub main body 21, the outer side of the outer hub surface 22 is detachably connected with the protection end cover, the locking nut 1 is positioned on the inner side of the protection end cover, the planet carrier 7 is provided with the second positioning end surface 71, the second positioning end surface 71 is in contact connection with the inner hub end surface 23, the adjusting pad 6 is arranged between the planet carrier 7 and the bearing portion, and the adjusting pad 6 is sleeved on the hub main body 21, the adjustment pad 6 is located between the second positioning end face 71 and the outer end face of the second bearing 5.

Casing 4 includes casing body 41, casing body 41 is the flange 42 of annular structure to the inside protruding formation of, flange 42 both sides are equipped with first bearing joint groove 43, second bearing joint groove 44, 3 joints of first bearing are in first bearing joint groove 43, 5 joints of second bearing are in second bearing joint groove 44, first bearing 3, the inner circle and the 24 interference fit of bearing installation shoulder of second bearing 5 are connected, first bearing 3, the outer lane and the 4 clearance fit of casing of second bearing 5 are connected, second bearing 5 is located the inboard of first bearing 3, the outside in first bearing joint groove 43 is open structure, the inboard of second bearing joint groove 44 is open structure.

When the locking device is used, the operation of the hub 2 is transmitted to the planet carrier 7 by external power, the planet carrier 7 is in spline fit with the hub 2 and is in clearance fit with the shaft hole, and when the locking nut 1 is in threaded fit with the planet carrier 7 for locking, the planet carrier 7 and the hub 2 are pressed and combined to form synchronous rotation; when the wheel hub 2 operates, the inner rings of the first bearing 3 and the second bearing 5 are connected with the bearing mounting shaft shoulder 24 in an interference fit manner, the outer rings of the first bearing 3 and the second bearing 5 are connected with the shell 4 in a clearance fit manner, and the wheel hub 2 rotates relative to the shell 4 (without rotating); when the inner rings of the first bearing 3 and the second bearing 5 and the hub 2 rotate synchronously, the designed play of the bearings is controlled by adding the adjusting pad 6 to ensure the consistency of the play, and the thickness of the adjusting pad can be selected according to the value D in the figure 2, namely x is D-h (x-designed play, the range is 0-0.01mm, h is the thickness of adjusting pads, and a plurality of groups of pads with different thicknesses); the theoretical value of the initial value D of the structural design is within a set range value, as shown in fig. 3, after the assembly is completed, the large end surface of the inner ring of the first bearing 3 is tightly attached to the first positioning end surface 25, and the inner end surface 23 of the hub 2 in the axis direction is higher than that of the inner ring of the second bearing 5, so that the distance between the large end surface of the inner ring of the second bearing 5 and the inner end surface 23 of the hub is measured, the actual value can be measured by a conventional means, and the readability is relatively intuitive, namely after the hub 2, the first bearing 3, the shell 4 and the second bearing 5 are tightly assembled, the distance between the large end surface of the inner ring of the second bearing 5 and the inner end surface 23 of the hub is measured, then the adjusting pad 6 is added, the distance between the outer end surface of the adjusting pad 6 and the inner end surface 23 of the hub is adjusted within the range of D, then the locking nut 1 is locked, and the planet carrier 7 is tightly contacted with the hub 2, the bearing clearance required by design is guaranteed after assembly, the measurement process is direct measurement, the measurement rapidness and accuracy are improved, and errors caused by indirect measurement are reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.