CN114427569A - Linear sliding bearing and telescopic device - Google Patents
Linear sliding bearing and telescopic device Download PDFInfo
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- CN114427569A CN114427569A CN202210042876.7A CN202210042876A CN114427569A CN 114427569 A CN114427569 A CN 114427569A CN 202210042876 A CN202210042876 A CN 202210042876A CN 114427569 A CN114427569 A CN 114427569A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/02—Sliding-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/10—Telescoping systems
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Abstract
The application relates to the technical field of bearing mechanisms and discloses a linear sliding bearing, which comprises an inner cylinder; the outer cylinder is sleeved on the inner cylinder; the one or more flanges are arranged on the inner cylinder and/or the outer cylinder, and the inner wall or the outer wall of each flange is provided with a first adjusting surface; the sliding block group is arranged on the inner wall or the outer wall of the flange and is provided with a second adjusting surface which is abutted with the first adjusting surface; the first adjusting surface moves relative to the second adjusting surface along the direction of the central axis of the inner cylinder, and the diameter of the contact surface of the sliding block set and the inner cylinder and/or the outer cylinder is increased or decreased so as to adjust the gap between the sliding block set and the inner cylinder or the outer cylinder. The radial clearance between the sliding block group and the cylinder wall can be effectively adjusted through the arranged first adjusting surface and the second adjusting surface, so that the contact surface of the sliding block group is uniformly contacted with the cylinder wall, and an effective support is formed under the condition of smooth extension; and the sliding block group consists of a plurality of sliding blocks, and forms multi-point contact with the outer wall of the inner cylinder and/or the inner wall of the outer cylinder, so that the supporting strength is improved. The application also discloses a telescoping device.
Description
Technical Field
The present application relates to the technical field of bearing mechanisms, and for example, to a linear sliding bearing and a telescopic device.
Background
At present, some existing telescopic devices adopt a structure that multi-stage large-diameter thin-wall cylinders are nested layer by layer. When in work, the cylinders at all levels can extend or retract step by step from thick to thin in sequence, so that the telescopic device has good movement precision. Linear sliding bearings are generally used as supporting guide structures.
The linear sliding bearing generally adopts a shaft sleeve or two half bearing bush structures, the shaft sleeve material has self-lubricating performance, and is in surface contact with a cylindrical shaft and a hole, so that the linear sliding bearing belongs to sliding friction, has large bearing capacity and is suitable for the working conditions of heavy load and low speed.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
in the linear sliding bearing, when the machining size of the inner cylinder or the outer cylinder of the linear sliding bearing has an error, and the wall thickness of the shaft sleeve or the bearing bush of the linear sliding bearing is a fixed value, the machining size of the inner cylinder or the outer cylinder cannot be compensated, and further effective support cannot be formed, so that the use of the telescopic device is influenced after the linear sliding bearing is installed.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a linear sliding bearing and a telescopic device, which can effectively adjust the radial clearance between the sliding surface and the cylinder wall of a sliding block group, improve the supporting strength of the linear sliding bearing, and further prolong the service life.
In some embodiments, a linear sliding bearing, an inner barrel; the outer cylinder is sleeved on the inner cylinder; the one or more flanges are arranged on the inner cylinder and/or the outer cylinder, and the inner wall or the outer wall of each flange is provided with a first adjusting surface; the sliding block group is arranged on the inner wall or the outer wall of the flange and is provided with a second adjusting surface which is abutted with the first adjusting surface; the first adjusting surface moves relative to the second adjusting surface along the direction of the central axis of the inner cylinder, and the diameter of the contact surface of the sliding block set and the inner cylinder and/or the outer cylinder is increased or decreased so as to adjust the gap between the sliding block set and the inner cylinder or the outer cylinder.
In some embodiments, a telescopic device comprises the linear sliding bearing of the previous embodiments
The linear sliding bearing and the telescopic device provided by the embodiment of the disclosure can realize the following technical effects:
the radial clearance between the sliding block group and the cylinder wall can be effectively adjusted through the arranged first adjusting surface and the second adjusting surface, so that the contact surface of the sliding block group is uniformly contacted with the cylinder wall, and an effective support is formed under the condition of smooth extension; and the sliding block group consists of a plurality of sliding blocks, and forms multi-point contact with the outer wall of the inner cylinder and/or the inner wall of the outer cylinder, so that the supporting strength is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic view of a linear sliding bearing according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a slider group according to an embodiment of the present disclosure;
FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic view of multiple slider and flange mounting provided by embodiments of the present disclosure
FIG. 5 is a schematic structural diagram of another slider group provided by an embodiment of the present disclosure;
FIG. 6 is a schematic cross-sectional view B-B of FIG. 5;
FIG. 7 is a schematic view of another multiple slider and flange mounting provided by embodiments of the present disclosure.
Reference numerals:
10: an inner barrel; 20: an outer cylinder;
30: a slider group; 31: a slider; 311: a second conditioning surface; 32: a holder; 33: an end cap; 40: a flange; 41: a first adjusting surface.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and claims of the embodiments of the disclosure and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their examples and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
In the prior art, a linear sliding bearing adopts a whole-circle shaft sleeve or a bearing bush structure which is split into two halves, and the diameter and the wall thickness are constant values; when the inner barrel or the outer barrel is a large-diameter thin-wall part, the machining size of the inner barrel or the outer barrel has an error; the shaft sleeve or the bearing bush can not compensate the processing size of the inner cylinder or the outer cylinder; resulting in too large a gap between the bearing and the inner or outer cylinder and thus failing to form an effective support.
On the other hand, the linear sliding bearing in the prior art has a small size (generally not exceeding 100mm), but the sleeve diameter of some telescopic devices is larger, and the sleeve diameter is from 200mm to 500mm, and is selected from the diameter size sequence recommended by the national standard, no finished linear sliding bearing which can be directly selected is available, and the cost for non-standard customization according to the original structure is very high.
As shown in fig. 1, the present embodiment provides a linear sliding bearing including: an inner cylinder 10; an outer cylinder 20 sleeved on the inner cylinder 10; one or more flanges 40 disposed on the inner cylinder 10 and/or the outer cylinder 20, and a first adjusting surface 41 disposed on an inner wall or an outer wall of the flange 40; the sliding block group 30 is arranged on the inner wall or the outer wall of the flange 40 and is provided with a second adjusting surface 311, and the second adjusting surface 311 is abutted with the first adjusting surface 41; the first adjusting surface 311 moves relative to the second adjusting surface 41 along the central axis direction of the inner cylinder 10, and increases or decreases the diameter of the contact surface of the slider group 30 and the inner cylinder 10 and/or the outer cylinder 20, so as to adjust the gap between the slider group 30 and the inner cylinder 10 or the outer cylinder 20.
By adopting the linear sliding bearing of the embodiment of the disclosure, the radial clearance between the sliding block set 30 and the cylinder wall can be effectively adjusted by arranging the first adjusting surface 41 and the second adjusting surface 311, so that the contact surface of the sliding block set 30 is uniformly contacted with the cylinder wall, and an effective support is formed under the condition of smooth extension; and the sliding block group 30 is composed of a plurality of sliding blocks 31, and forms multi-point contact with the outer wall of the inner cylinder 10 and/or the inner wall of the outer cylinder 20, thereby improving the supporting strength.
In some embodiments, when the flange 40 is disposed on the inner cylinder 10, the outer wall of the flange 40 is provided with a first adjusting surface 41; when the flange 40 is disposed on the outer cylinder 20, the inner wall of the flange 40 is provided with a first adjusting surface 41. By using the flange 40, the radial clearance between the sliding surface of the sliding block set 30 and the cylinder wall is convenient to adjust, the supporting strength of the linear sliding bearing can be further improved, and the reliability and the service life of the linear sliding bearing are further improved.
In the present embodiment, as shown in fig. 2 to 4, the flange 40 is screwed to the inner tube 10. At this time, the flange 40 is fitted over the outer wall of the inner cylinder 10, or the axial end face of the flange 40 is connected to the end of the inner cylinder 10. The outer wall of the flange 40 is provided with a first adjusting surface 41, and the second adjusting surface 311 of the slider group 30 abuts against the first adjusting surface 41. Thus, the sliding surface of the slider 31 can be surely abutted against the inner wall of the outer cylinder 20.
As shown in fig. 5 to 7, the flange 40 is mounted on the inner wall of the outer cylinder 20, and the slider group 30 is disposed on the inner wall of the flange 40. At this time, the sliding surfaces of the plurality of sliders 31 abut against the outer wall of the inner cylinder 10; when the outer cylinder 20 moves relative to the inner cylinder 10, the plurality of sliders 31 slide on the outer wall of the inner cylinder 10, and make multi-point contact with the outer wall of the inner cylinder 10, thereby improving the support strength.
Here, the flange 40 is connected to the inner cylinder 10 by screws, for example. At this time, the inner wall of the flange 40 abuts against the outer wall of the inner cylinder 10, and the outer wall of the flange 40 is provided with a first regulation surface 41.
In this embodiment, the outer wall of the flange 40 is provided with a first adjusting surface 41, the slider group 30 is provided with a second adjusting surface 311, and the second adjusting surface 311 abuts against the first adjusting surface 41; the diameter of the contact surface of the slider group 30 and the outer cylinder 20 can be increased or decreased by the relative movement of the second regulating surface 311 and the first regulating surface 41. The first adjusting surface 41 and the second adjusting surface 311 are both provided with a conical surface structure with a low position portion and a high position portion. Taking the first adjusting surface 41 at the middle position of the second adjusting surface 311 as an example, the first adjusting surface 41 is provided on the outer wall of the inner cylinder 10 at a position corresponding to the slider group 30, the second adjusting surface 311 is provided on the slider group 30, and the first adjusting surface 41 can be bonded to the second adjusting surface 311.
When the radial clearance between the slider group 30 and the cylinder wall needs to be reduced, by adjusting the relative position of the first adjusting surface 41 moving along the second adjusting surface 311, for example, the first adjusting surface 41 moves from the first position to the second position along the second adjusting surface 311, at this time, the high position of the first adjusting surface 41 coincides with the second adjusting surface 311, which is equivalent to increasing the diameter of the contact surface between the slider group 30 and the outer cylinder 20.
When the radial clearance between the slider group 30 and the cylinder wall needs to be increased, the first adjusting surface 41 moves from the first position to the third position along the second adjusting surface 311 by adjusting the relative position of the first adjusting surface 41 moving along the second adjusting surface 311, and at this time, the lower position of the first adjusting surface 41 overlaps with the second adjusting surface 311, which is equivalent to reducing the diameter of the contact surface between the slider group 30 and the outer cylinder 20.
In this embodiment, the inner wall of the flange 40 is provided with a first adjusting surface 41, and the second adjusting surface 311 on the sliding block set 30 is used in cooperation with the first adjusting surface 41 of the flange 40, and the adjusting manner is the same as the adjusting manner of the outer wall of the flange 40 provided with the first adjusting surface 41, which is not described herein again.
In some embodiments, each of the sliding block sets 30 includes a plurality of sliding blocks 31, and the end surfaces of the plurality of sliding blocks 31 are located in the same plane, and the plane is perpendicular to the axis of the inner cylinder 10; the outer wall of the flange 40 is provided with a first adjusting surface 41, and the sliding surfaces of a plurality of sliding blocks 31 in the sliding block group 30 are abutted with the inner wall of the outer cylinder 20; the inner wall of the flange 40 is provided with a first adjusting surface 41, and the sliding surfaces of a plurality of sliding blocks 31 in the sliding block group 30 are abutted with the outer wall of the inner cylinder 10; the side of the slide 31 facing away from the sliding surface is provided with a second adjusting surface 311.
In the present embodiment, a slider group 30 is disposed between the inner cylinder 10 and the outer cylinder 20, the slider group 30 is composed of a plurality of sliders 31, end surfaces of the plurality of sliders 31 are located in the same plane, and the plane is perpendicular to the axis of the inner cylinder 10. Thus, the moving direction of the plurality of sliders 31 is always parallel to the axes of the inner cylinder 10 and the outer cylinder 20, and the sliders 31 can smoothly slide, thereby preventing the plurality of sliders 31 from being displaced from the inner cylinder 10 and the outer cylinder 20 and preventing the sliders 31 from being blocked from sliding. Thereby ensuring the smooth and non-jamming of the inner cylinder 10 and the outer cylinder 20 during relative movement.
Wherein, a sliding block set 30 is arranged between the inner cylinder 10 and the outer cylinder 20, the sliding block set 30 is sleeved on the outer wall of the flange 40, and at the moment, the sliding surfaces of the sliding blocks 31 are abutted with the inner wall of the outer cylinder 20. When the outer cylinder 20 moves relative to the inner cylinder 10, the plurality of sliders 31 slide on the inner wall of the outer cylinder 20 in the cylinder axial direction, and form multi-point contact with the inner wall of the outer cylinder 20, thereby improving the support strength.
The slider group 30 is fixedly attached to the inner wall of the flange 40, and at this time, the sliding surfaces of the plurality of sliders 31 abut against the outer wall of the inner cylinder 10, and when the outer cylinder 20 moves relative to the inner cylinder 10, the plurality of sliders 31 slide on the outer wall of the inner cylinder 10 in the cylinder axial direction, and are in multi-point contact with the outer wall of the inner cylinder 10, thereby improving the support strength.
Further, in the embodiment, in order to make the inner cylinder 10 and the outer cylinder 20 move more smoothly, a plurality of sliding block sets 30 may be disposed between the inner cylinder 10 and the outer cylinder 20 to form sliding pairs, for example, two, three or four sliding block sets may be disposed, and may be selected according to actual requirements.
In the above embodiment, the size of the sliding blocks 31 and the number of the sliding blocks 31 can be flexibly designed according to the diameters of the inner cylinder 10 and the outer cylinder 20 and the bending moment loads of the inner cylinder 10 and the outer cylinder 20; the larger the diameters and loads of the inner cylinder 10 and the outer cylinder 20 are, the better the slider group 30 supports, and the size of the slider 31 can be increased, and the number of the sliders 31 can be increased accordingly. In practical applications, the sliding blocks 31 have no limit on the size and the size sequence, and the sliding surface of the sliding block 31 contacts with the outer wall of the inner cylinder 10 or the inner wall of the outer cylinder 20, so that the abrasion of the inner cylinder 10 and the outer cylinder 20 can be reduced.
Further, in order to facilitate adjustment of the diameter of the slider group 30, the second adjustment surface 311 of the slider 31 is engaged with the first adjustment surface 41 of the flange 40. It is convenient to directly adjust the contact stress between the sliding surface of the sliding block 31 and the outer wall of the inner cylinder 10 or the inner wall of the outer cylinder 20.
In some embodiments, the slider group 30 includes: a holder 32 provided on an inner wall or an outer wall of the flange 40; the retainer 32 is circumferentially provided with a plurality of limiting through grooves for fixing the sliding blocks 31, and the sliding blocks 31 are arranged in the limiting through grooves and can radially move in the limiting through grooves. The holder 32 fixes the plurality of sliders 31 to form the slider group 30.
In the present embodiment, when the inner cylinder 10 and/or the outer cylinder 20 is provided with the flange 40, the holder 32 of the slider group 30 is disposed on the outer wall of the inner cylinder 10 or the inner wall of the outer cylinder 20, and the holder 32 can ensure the stability of the connection of the slider group 30.
In the present embodiment, the slider group 30 is composed of a holder 32 and a plurality of sliders 31 fixed to the holder 32. The retainer 32 is a circular frame structure, a limiting through groove for fixing the sliding block 31 is formed in the frame structure, and the sliding block 31 is directly fixed in the limiting through groove of the retainer 32. Thus, the sliding blocks 31 can move outwards or inwards along the radial direction in the limiting through grooves, the first adjusting surfaces 41 are adjusted to move relative to the second adjusting surfaces 311 along the central axis direction of the inner cylinder, the radial clearance between the sliding blocks 31 and the cylinder wall is further adjusted, and the end faces of the sliding blocks 31 can be always positioned in the same plane through the retainer 32.
In the present embodiment, the slide 31 is located between the inner cylinder 10 and the outer cylinder 20 by the retainer 32. Optionally, the retainer 32 is sleeved on the outer wall of the inner cylinder 10, and the sliding surface of the sliding block 31 abuts against the inner wall of the outer cylinder 20; alternatively, the retainer 32 is fixedly attached to the inner wall of the outer cylinder 20, and the sliding surface of the slider 31 abuts against the outer wall of the inner cylinder 10.
In the above embodiment, in order to ensure that the slider 31 can be stably fixed on the holder 32, a positioning mechanism is further disposed on the holder 32, which also facilitates the detachment and installation of the slider 31.
In some embodiments, the slider group 30 further comprises: and the end cover 33 is fixedly arranged on the retainer 32, and the end cover 33 is abutted with the end surfaces of the plurality of sliders 31 in the slider group 30 so as to limit the sliders 31 in the limiting through grooves.
In this embodiment, the retainer 32 is provided with a limiting through groove, in order to prevent the slider 31 from shaking, an end cover 33 is further provided on the upper portion of the limiting through groove, and the end cover 33 is provided on the opening side of the limiting through groove and used for tightly pushing the end portion of the slider 31 to prevent the end portion from moving in the axial direction.
In some embodiments, the flange 40 is disposed on the same side as the end cap 33 in the slider group 30.
In the present embodiment, as shown in fig. 2 and 3, when the outer wall of the flange 40 is provided with the first adjusting surface 41, the end cover 33 in the slider group 30 is on the same side as the flange 40. At this time, the second regulation surface 311 of the slider 31 abuts against the first regulation surface 41 on the outer wall of the flange 40, the end surface of the end cap 33 abuts against the slider 31, and the flange 40 is disposed inside the end cap 33.
In the present embodiment, as shown in fig. 5, when the inner wall of the flange 40 is provided with the first adjusting surface 41, the end cover 33 in the slider group 30 is on the same side as the flange 40. At this time, the end cap 33 is provided on the inner wall side of the flange 40, and the end face of the end cap 33 abuts against the slider 31. The axial end face of the sliding block 31 is always vertical to the axial line of the inner cylinder 10 through the arranged end cover 33, and the sliding block 31 can always slide along the axial direction of the outer cylinder 20.
In some embodiments, the sliding surface of the sliding block 31 is a cylindrical surface with a radius matching the radius of the inner wall of the outer barrel 20 or the radius of the outer wall of the inner barrel 10.
In this embodiment, the sliding surface of the slider 31 is a cylindrical surface, and when the sliding surface of the slider 31 abuts against the inner wall of the outer cylinder 20, the radius of the cylindrical surface is equal to the radius of the inner wall of the outer cylinder 20. When the sliding surface of the slider 31 abuts against the outer wall of the inner cylinder 10, the radius of the cylindrical surface is equal to the radius of the outer wall of the inner cylinder 20, and therefore, the radius of the cylindrical surface of the slider 31 matches the radius of the outer wall of the inner cylinder 10 or the radius of the inner wall of the outer cylinder 20. Sliding friction can be formed between the sliding block 31 and the cylinder wall, and the inner cylinder 10 is supported to slide along the axial direction of the outer cylinder 20.
In some embodiments, two flanges 40 are provided with a set distance between the two flanges 40 in the axial direction.
In the present embodiment, the flange 40 is provided with the slider group 30, and when an external force perpendicular to the axis is applied to the end of the inner cylinder 10 or the outer cylinder 20, the linear sliding bearing is subjected to a large bending moment. The radial bearing force of the two slider sets 30 during operation forms a moment of couple to resist the load bending moment. The distance between the two sets of sliders 30 is the couple arm. When the inner cylinder 10 extends out of the outer cylinder 20 to the limit position, the distance between the two sliding block sets 30 is the minimum, namely the minimum couple arm. The longer the minimum force couple arm is, the stronger the bending resistance bearing capacity of the linear sliding bearing is.
In the present embodiment, the corresponding slider group 30 and the flange 40 are combined into an assembly. Wherein, the first assembly member is installed on the top of the inner cylinder 10, the second assembly member is located on the bottom of the outer cylinder 20, and the two assembly members are used in pairs and support the inner cylinder 10 to slide smoothly in the outer cylinder 20 along the axial direction.
Alternatively, the first assembly member and the second assembly member are both fixedly disposed on the inner wall of the outer cylinder 20, and the slider of the slider group 30 abuts against the outer wall of the inner cylinder 10.
Alternatively, the first assembly member and the second assembly member are both fixedly disposed at both ends of the inner cylinder 10, and the slider of the slider group 30 abuts against the inner wall of the outer cylinder 20.
In order to ensure a good bending resistance of the linear sliding bearing, in some embodiments, a plurality of flanges 40 are provided with a set distance between two flanges 40 that are axially most spaced apart.
In the embodiment, the flange 40 is provided with the slider group 30, for example, the flange 40 is provided with two, and when an external force perpendicular to the axis is applied to the end of the inner cylinder 10 or the outer cylinder 20, the linear sliding bearing is subjected to a large bending moment. The radial bearing forces of the two flanges 40 during operation form a moment of couple to resist the load bending moment experienced. The spacing between the two flanges 40 is known as a couple arm. When the inner barrel 10 is extended from the outer barrel 20 to the limit position, the distance between the two flanges 40 is the smallest, i.e. the smallest couple arm. The longer the minimum force couple arm is, the stronger the bending resistance bearing capacity of the linear sliding bearing is.
Since linear sliding bearings are usually used between two sleeves which move relative to each other, a bearing effect is achieved. For example, when two sleeve sleeves which move relatively are sleeved and do telescopic motion, the linear sliding bearing is arranged between the two sleeves, and if the linear sliding bearing is installed, a larger gap exists between the two sleeves. At this time, if the gap between the two sleeves is too large, the two sleeves cannot be attached to the linear sliding bearing and shake; if the clearance between the two sleeves is too small, the two sleeves are blocked due to interference fit. Therefore, the structure of the linear sliding bearing can be changed to adjust the gap therebetween.
The disclosed embodiment provides a telescopic device, which comprises a linear sliding bearing as in the previous embodiment. The multi-stage sleeve is further included, after the linear sliding bearing is connected with the sleeve, the flange 40 and the sliding block group 30 are arranged between the two sleeves, and a cantilever structure can be formed after the multi-stage sleeve is unfolded.
In the embodiment, in order to ensure the supporting rigidity and the movement precision of the multi-stage sleeves after extending out, the gap between the adjacent sleeves needs to be adjusted, the flange 40 is extruded through the screw, and a certain pretightening force is applied to compress the radial gap between the sliding block 31 and the sleeves into a negative value; first, the first adjusting surface 41 moves along the axial direction, and then the first adjusting surface 41 pushes the sliding block 31 along the radial direction to tightly push against the cylinder wall, so that the sliding block 31 and the cylinder wall form an interference fit, and further, the bearing capacity and the impact resistance are improved, and meanwhile, the sliding block still can stretch smoothly.
In the above embodiment, the telescopic device, after adopting the linear sliding bearing of this structure, has a 5-stage cylinder with a contracted length of 654mm, an extended total length of 2290m, and a repeated positioning accuracy of ± 1 mm.
In the above embodiment, since the interference adjustment process is performed after the structure is assembled, the assembly and disassembly are not difficult, and only the adjustment screw needs to be tightened or loosened.
In conclusion, through the structure, the radial clearance between the sliding block 31 and the cylinder wall can be adjusted, if the machining size of the sleeve of the telescopic device has errors, the sleeve can be compensated to a certain extent, so that the sliding block 31 is in uniform contact with the cylinder wall to form effective support, and further, the sleeve of the telescopic device can still keep higher support rigidity under the working condition of complete extension, can be smoothly extended, does not clamp and cannot shake.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A linear sliding bearing, comprising:
an inner barrel;
the outer cylinder is sleeved on the inner cylinder;
the one or more flanges are arranged on the inner cylinder and/or the outer cylinder, and the inner wall or the outer wall of each flange is provided with a first adjusting surface;
the sliding block group is arranged on the inner wall or the outer wall of the flange and is provided with a second adjusting surface, and the second adjusting surface is abutted with the first adjusting surface;
the first adjusting surface moves relative to the second adjusting surface along the direction of the central axis of the inner cylinder, and the diameter of the contact surface of the sliding block set and the inner cylinder and/or the outer cylinder is increased or decreased, so that the gap between the sliding block set and the inner cylinder or the outer cylinder is adjusted.
2. The linear sliding bearing according to claim 1, wherein when the flange is provided on the inner cylinder, an outer wall of the flange is provided with a first regulation surface; the flange set up in when the urceolus, the inner wall of flange is provided with first regulation face.
3. The linear sliding bearing according to claim 2, wherein each of the slider groups includes a plurality of sliders, and end surfaces of the plurality of sliders are located in the same plane, and the plane is perpendicular to the axis of the inner cylinder;
the outer wall of the flange is provided with a first adjusting surface, and sliding surfaces of a plurality of sliding blocks in the sliding block set are abutted to the inner wall of the outer cylinder; the inner wall of the flange is provided with a first adjusting surface, and sliding surfaces of a plurality of sliding blocks in the sliding block group are abutted to the outer wall of the inner cylinder; one side of the sliding block, which deviates from the sliding surface, is provided with a second adjusting surface.
4. The linear slide bearing of claim 2 wherein the slider set comprises:
the retainer is arranged on the inner wall or the outer wall of the flange;
the retainer is circumferentially provided with a plurality of limiting through grooves for fixing the sliding blocks, and the sliding blocks are arranged in the limiting through grooves and can move radially in the limiting through grooves.
5. The linear slide bearing of claim 4 wherein the slider set further comprises:
and the end covers are fixedly arranged on the retainer and are abutted with the end surfaces of the sliders in the slider group so as to limit the sliders in the limiting through grooves.
6. The linear sliding bearing according to claim 5, characterized in that the flange is arranged on the same side as the end cap in the sliding block set.
7. The linear sliding bearing according to any one of claims 2 to 6, wherein the sliding surface of the slider is a cylindrical surface having a radius matching the radius of the inner wall of the outer sleeve or the radius of the outer wall of the inner sleeve.
8. The linear sliding bearing according to claim 1, wherein when two flanges are provided, there is a set distance between the two flanges in the axial direction.
9. A linear sliding bearing according to claim 1, wherein a plurality of flanges are provided with a set distance between two of the flanges that are axially most spaced apart.
10. A telescopic device, characterized in that it comprises a linear plain bearing according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210042876.7A CN114427569A (en) | 2022-01-14 | 2022-01-14 | Linear sliding bearing and telescopic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210042876.7A CN114427569A (en) | 2022-01-14 | 2022-01-14 | Linear sliding bearing and telescopic device |
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| Publication Number | Publication Date |
|---|---|
| CN114427569A true CN114427569A (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210042876.7A Pending CN114427569A (en) | 2022-01-14 | 2022-01-14 | Linear sliding bearing and telescopic device |
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| CN (1) | CN114427569A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257016A (en) * | 1996-03-25 | 1997-09-30 | Shinkoube Plast Kk | Expandable rod body |
| CN2502067Y (en) * | 2001-09-24 | 2002-07-24 | 王勇军 | One-way locating connection device |
| US20050002591A1 (en) * | 2003-05-22 | 2005-01-06 | Heinrich J. Kessebohmer Kg | Telescoping Slide |
| CN104454841A (en) * | 2014-12-12 | 2015-03-25 | 中山市思锐摄影器材工业有限公司 | Waterproof telescopic pipe structure |
| JP3201198U (en) * | 2015-09-14 | 2015-11-26 | 株式会社日暮里設計 | Telescopic joint structure |
| CN111706584A (en) * | 2020-05-09 | 2020-09-25 | 浙江捷昌线性驱动科技股份有限公司 | Lifting upright post gap piece mounting assembly and lifting upright post |
| CN112747018A (en) * | 2019-10-30 | 2021-05-04 | 发那科株式会社 | Direct-acting mechanism |
| CN113586568A (en) * | 2021-08-31 | 2021-11-02 | 中铁工程机械研究设计院有限公司 | Telescopic device and control method thereof |
-
2022
- 2022-01-14 CN CN202210042876.7A patent/CN114427569A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257016A (en) * | 1996-03-25 | 1997-09-30 | Shinkoube Plast Kk | Expandable rod body |
| CN2502067Y (en) * | 2001-09-24 | 2002-07-24 | 王勇军 | One-way locating connection device |
| US20050002591A1 (en) * | 2003-05-22 | 2005-01-06 | Heinrich J. Kessebohmer Kg | Telescoping Slide |
| CN104454841A (en) * | 2014-12-12 | 2015-03-25 | 中山市思锐摄影器材工业有限公司 | Waterproof telescopic pipe structure |
| JP3201198U (en) * | 2015-09-14 | 2015-11-26 | 株式会社日暮里設計 | Telescopic joint structure |
| CN112747018A (en) * | 2019-10-30 | 2021-05-04 | 发那科株式会社 | Direct-acting mechanism |
| CN111706584A (en) * | 2020-05-09 | 2020-09-25 | 浙江捷昌线性驱动科技股份有限公司 | Lifting upright post gap piece mounting assembly and lifting upright post |
| CN113586568A (en) * | 2021-08-31 | 2021-11-02 | 中铁工程机械研究设计院有限公司 | Telescopic device and control method thereof |
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