CN217029652U - Universal joint structure, universal joint system, precision equipment and laser level - Google Patents

Abstract

The utility model provides a gimbal structure, a gimbal system, a precision device and a laser level, comprising: the end part of the shaft part is provided with a clamping groove, and the sunken part of the clamping groove forms a step surface on the shaft part; the bearing is sleeved on the clamping groove and comprises an inner ring and an outer ring; and the elastic piece is supported between the inner ring and the step surface. The utility model makes the inner rings of the two bearings generate displacement along the axial direction relative to the fixed outer ring by means of the elasticity of the elastic piece, thereby directly contacting the inner ring and the outer ring with the balls, eliminating the clearance and achieving the aim of automatically adjusting the bearing clearance.

Description

Gimbal structure, gimbal system, precision equipment and laser level

Technical Field

The utility model relates to the technical field of precision mechanical mechanisms, in particular to a universal joint structure, a universal joint system, precision equipment and a laser level meter.

Background

The universal joint system usually comprises two shafts which can rotate freely and are vertical to each other and auxiliary parts, and the universal joint is a core part of precision equipment, such as a laser level meter, and can realize quick and accurate repeated positioning by means of the action of a gravity field and a damping system. In order to ensure high positioning precision and system stability, two sets of high-precision bearings are usually arranged on two shafts respectively. Therefore, the rotational accuracy of the bearing directly affects or determines the return accuracy of the universal joint. Because the bearing is a national standard precision part, usually only a standard precision part (such as P5C0) can be selected, the rotation precision of the bearing is determined by the machining precision grade of the bearing, and the machining precision of the bearing is mainly represented by the radial play of the bearing after the whole system is assembled into a whole. As shown in fig. 1, the size C of the radial play of the bearing in the prior art is the sum of C1, C2, C3 and C4, the existence of the radial play causes the relative displacement of the rotating part and the supporting part of the universal joint along the axial direction, i.e. the axial play directly causes the center of gravity of the rotating part to shift relative to the rotating shaft, thereby generating the resetting repeatability error. The general design is to reduce the radial play by adopting a manual adjustment method, and the clearance adjustment is larger or smaller due to the skill difference of operators or the difference of production tooling and environment, so that the resetting precision of the universal joint cannot reach an ideal range.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a universal joint structure, a universal joint system, precision equipment and a laser level meter, so as to reduce the radial play of a bearing in the universal joint structure and improve the precision of the whole structure, the system and the equipment.

The above object of the present invention can be achieved by the following technical solutions:

the present invention provides a gimbal structure including:

the end part of the shaft is provided with a clamping groove, and a stepped surface is formed on the shaft at the sunken position of the clamping groove;

the bearing is sleeved on the clamping groove and comprises an inner ring and an outer ring;

and the elastic piece is supported between the inner ring and the step surface.

The cross-sectional diameter of the end of the shaft is smaller to form the step surface.

The gimbal structure further includes:

and the clamping groove is formed between the pressing ring and the step surface.

The pressing ring is annular, the pressing ring is abutted to the outer ring of the bearing, and a yielding space is arranged at a position, which is at least right opposite to the inner ring, on the pressing ring.

The pressing ring is annular, a through hole is formed in the pressing ring, and the projection of the through hole on the bearing at least covers the inner ring.

The elastic piece is a spring.

The spring is in a compressed state.

A gimbal system comprising at least one gimbal structure according to any of the above aspects.

A precision apparatus comprising a gimbal structure according to any preceding aspect, and/or a gimbal system comprising an aspect as defined above.

A laser level comprising:

a body;

the laser light source is arranged on the machine body and comprises a first laser light source and a second laser light source;

the upper bearing seat is arranged on the machine body;

the lower bearing seat is provided with the shaft piece, the two bearings are sleeved at two ends of the shaft piece, and the two elastic pieces are respectively supported between the inner rings of the bearings at two sides and the step surface.

The utility model has the characteristics and advantages that:

the utility model provides a universal joint structure, comprising: the end part of the shaft part is provided with a clamping groove, and the sunken part of the clamping groove forms a step surface on the shaft part; the bearing is sleeved on the clamping groove and comprises an inner ring and an outer ring; and the elastic piece is supported between the inner ring and the step surface.

The utility model makes the inner rings of the two bearings generate displacement along the axial direction relative to the fixed outer ring by means of the elasticity of the elastic piece, thereby directly contacting the inner ring and the outer ring with the balls, eliminating the clearance and achieving the aim of automatically adjusting the bearing clearance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view showing the radial play C of a bearing in the prior art;

FIG. 2 is a schematic cross-sectional view of a laser level of the present invention;

FIG. 3 is a schematic cross-sectional view of another embodiment of the laser level of the present invention;

FIG. 4 is an enlarged view of the end structure of the shaft shown at A in FIG. 2;

fig. 5 is a schematic view showing a state in which the radial play of the bearing of the present invention is reduced.

The reference numbers indicate:

1. a shaft member; 11. pressing a ring; 12. an elastic member; 13. a step surface; 2. a bearing; 21. an outer ring; 22. a ball bearing; 23. an inner ring; 24. a blocking cover; 3. a body; 4. a laser light source; 5. an upper bearing seat; 6. and a lower bearing seat.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 2 to 5, the present invention provides a gimbal structure including: the shaft part 1 is provided with a clamping groove at the end part of the shaft part 1, and a stepped surface 13 is formed on the shaft part 1 at the sunken position of the clamping groove; the bearing 2 is sleeved on the clamping groove, and the bearing 2 comprises an inner ring 23 and an outer ring 21; and an elastic member 12 supported between the inner race 23 and the step surface 13.

The utility model makes the inner ring 23 of the two bearings 2 generate displacement along the axial direction relative to the fixed outer ring 21 by the elasticity of the elastic element 12, thereby directly contacting the inner ring and the outer ring with the balls 22, eliminating the clearance and achieving the aim of automatically adjusting the clearance of the bearings 2.

In the embodiment, the bearing 2 further includes balls 22 located between the inner ring 23 and the outer ring 21, and a blocking cover 24 for blocking a gap between the inner ring 23 and the outer ring 21. As shown in fig. 5, one of the inner ring 23 and the outer ring 21 is provided with a groove for the shield cover to be inserted into, and the other of the inner ring 23 and the outer ring 21 is slidably connected to the other end of the shield cover. Referring to fig. 5, in the present embodiment, the outer ring 21 is provided with a groove, and the blocking cover 24 is slidably connected to the inner ring 23. And the length of both ends of the inner ring is further extended on the basis of being capable of supporting the blocking cover 24, so that the left and right ends of the blocking cover 24 have enough length, and the blocking cover 24 can still be supported after the inner ring 23 is displaced.

The form of the engaging groove is not particularly limited, and in the present embodiment, as shown in fig. 2 and 4, the cross-sectional diameter of the end portion of the shaft member 1 is smaller than the middle portion of the shaft member 1, so that a step surface 13 is formed at a portion where the cross-sectional diameter of the shaft member 1 changes, and the end portion of the shaft member 1 is formed to be able to fit the bearing 2.

In addition to the above embodiments, as a further limited embodiment, the gimbal structure further includes: and the clamping groove is formed between the pressing ring 11 and the step surface 13. As shown in fig. 4, the pressing ring 11 limits the bearing 2 so that the bearing 2 does not fall off in the axial direction of the shaft member 1.

The connection mode between the pressing ring 11 and the shaft element 1 is not particularly limited, and in this embodiment, as shown in fig. 4, the pressing ring 11 is movably connected to the end of the shaft element 1, and may be connected through a thread connection or may be connected through an interference fit.

The shape of the pressing ring 11 is not particularly limited, the pressing ring 11 is annular, the pressing ring 11 abuts against the outer ring 21 of the bearing 2, and a yielding space is at least arranged at a position, right opposite to the inner ring 23, on the pressing ring 11. Referring to fig. 5, in order to ensure that the spring can push and displace the inner ring 23, the radial play is reduced or even eliminated by Δ L, the pressing ring 11 cannot form an obstacle to the inner ring 23 of the bearing 2, and therefore, the pressing ring 11 needs to be hollowed or grooved at least at a position corresponding to the moving path of the inner ring 23. In this embodiment, as shown in fig. 4, the pressing ring 11 has a cap shape and a ring-shaped cross section. As an alternative embodiment, the clamping ring 11 is annular in its entirety. Namely, the pressing ring 11 is annular, and the pressing ring 11 is provided with a through hole, and the projection of the through hole on the bearing 2 at least covers the inner ring 23.

In addition to the above embodiments, as a further limited embodiment, the elastic member 12 is a spring. As an alternative embodiment, the elastic element 12 may be replaced by another elastic element than a spring, for the purpose of pushing the inner ring 23 of the bearing 2 into displacement to reduce or eliminate the radial play of the bearing 2.

On the basis of the above embodiments, as a further limited embodiment, the spring is in a compressed state as shown in fig. 2-4.

One or more of the gimbal structures of any of the above embodiments, or one or more of the gimbal structures of any of the above embodiments in combination with other functional components, may form a gimbal system.

The universal joint structure and the application of the universal joint system in any embodiment are not limited, and the universal joint structure and the universal joint system can be applied to any precision equipment to solve the problem that the radial play of the bearing 2 influences the precision of the equipment.

The present embodiment further provides a laser level, as shown in fig. 2 and 3, including: a body 3; the laser light source 4 is arranged on the machine body 3 and comprises a first laser light source 4 and a second laser light source 4; the upper bearing 2 seat is arranged on the machine body 3; the bearing comprises a lower bearing 2 seat, a shaft element 1 is arranged on the lower bearing 2 seat, the bearing 2 is provided with two sleeves at two ends of the shaft element 1, and the elastic element 12 is provided with two inner rings 23 and step surfaces 13 which are respectively supported on the bearings 2 at two sides. The inner rings 23 of the two bearings 2 are displaced in the axial direction relative to the fixed outer ring 21 by the elastic force of the elastic member 12, so that the inner rings, the outer rings and the balls 22 are in direct contact with each other, and the clearance is eliminated, thereby achieving the purpose of automatically adjusting the play of the bearings 2.

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 utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model 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 utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A gimbal structure, comprising:

the shaft part (1), the end of the shaft part is provided with a clamping groove, and the concave part of the clamping groove is formed on the shaft part (1) to form a step surface (13);

the bearing (2) is sleeved on the clamping groove, and the bearing (2) comprises an inner ring (23) and an outer ring (21);

an elastic member (12) supported between the inner race (23) and the step surface (13).

2. The gimbal structure of claim 1, wherein: the cross-sectional diameter of the end of the shaft member (1) is smaller to form the step surface (13).

3. The gimbal structure of claim 2, wherein: further comprising:

and the clamping groove is formed between the pressing ring (11) and the step surface (13).

4. A joint construction according to claim 3, wherein the clamping ring (11) is annular and abuts against the outer ring (21) of the bearing (2), and wherein at least the part of the clamping ring (11) facing the inner ring (23) is provided with a space for clearance.

5. A joint construction according to claim 3, wherein the clamping ring (11) is ring-shaped and is provided with through holes which, in projection onto the bearing (2), cover at least the inner ring (23).

6. A joint construction according to any of claims 1-5, wherein the resilient member (12) is a spring.

7. The gimbal structure of claim 6, wherein the spring is in a compressed state.

8. A gimbal system comprising at least one gimbal structure as claimed in any of claims 1 to 7.

9. Precision equipment, characterized in that it comprises a gimbal structure according to any of claims 1-7 and/or comprises a gimbal system according to claim 8.

10. A laser level, comprising:

the gimbal structure of any of claims 1-7;

a body (3);

the laser light source (4) is arranged on the machine body (3) and comprises a first laser light source and a second laser light source;

the upper bearing seat (5) is arranged on the machine body (3);

the lower bearing seat (6), axle piece (1) is located on the lower bearing seat (6), bearing (2) have two covers to be located the both ends of axle piece (1), elastic component (12) have two to support respectively at both sides bearing (2) inner circle (23) with between step face (13).

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