High-strength precision mechanical part

Abstract

The utility model relates to the field of mechanical parts, in particular to a high-strength precision mechanical part which comprises a bolt and a nut, the bolt is composed of a head and a screw rod, a plurality of spiral strips capable of sliding along external threads of the screw rod are arranged on the periphery of the screw rod, a nut sleeve is sleeved on the nut, and an extending cylinder is fixed on the nut sleeve. A through groove is formed in the end, away from the nut sleeve, of the sleeve, and a clamping block capable of being clamped into the through groove is fixedly arranged at the end, away from the head, of the screw. The screw rod penetrates through two parts to be connected and is screwed in along the external threads on the screw rod through the spiral strip, so that partial threads, located between the two parts, of the screw rod are filled, the strength of the part of the screw rod is enhanced, and the situation that the part of the screw rod is bent due to external force is reduced; therefore, the nut is prevented from rotating reversely due to vibration, and the connection strength of the bolt and the nut is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical parts field, concretely is high strength precision mechanical parts. BACKGROUND

[0002] Fastener is a kind of mechanical parts widely used for fastening connection, in precision machinery, the connection strength and precision of fastener have great influence on the operation of precision machinery.

[0003] Among fastener, including bolt and nut, after bolt passes through the hole on component, it is screwed on screw rod by nut on the other side of component, realizes the connection between components, the cross section of bolt is reduced due to the establishment of thread, then the bending strength of bolt is reduced, and stress is mainly concentrated in thread root, thereby bolt and nut are prone to breakage in use and cause connection failure, seriously affect the normal movement of precision.

[0004] Therefore, a high-strength precision mechanical part is needed to alleviate the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing high-strength precision mechanical parts to overcome the above defects in the prior art.

[0006] According to the high-strength precision mechanical part of the utility model, the bolt is composed of a head and a screw rod, the screw rod has a plurality of helical strips on its outer periphery that can slide along the external thread, the nut has a nut sleeve, the nut sleeve has an extension cylinder fixed thereon, the extension cylinder has a sleeve connected thereto, the end of the sleeve away from the nut sleeve is provided with a through slot, and the end of the screw rod away from the head is provided with a clamping block that can be clamped into the through slot.

[0007] Through the above technical solution, the screw rod passes through the two components to be connected, and the helical strips are screwed into the external thread on the screw rod, thereby filling the thread of the screw rod between the two components, supporting the external thread with the helical strips and increasing the cross section of the screw rod at the thread, thereby enhancing the bending strength of the screw rod at this part, and the clamping block is clamped into the through slot, thereby limiting the rotation of the nut and preventing the nut from reversing due to vibration, ensuring the connection strength of the bolt and the nut.

[0008] The utility model is further provided as follows: the thread root of the external thread on the outer periphery of the screw rod is formed by connecting a circular arc segment and straight line segments on both sides of the circular arc segment in sequence, and the straight line segments of the thread root are tangent to the circular arc segment.

[0009] Through the above technical solution, the circular-arc-shaped thread root can reduce stress concentration, thereby improving the strength of the bolt.

[0010] The utility model further sets up: the cross section of spiral strip is identical with the outer thread cross section shape on screw rod.

[0011] Through the technical scheme, the spiral strip can fill the outer thread of the screw rod, thereby playing a supporting role in alignment and further enhancing the strength of the screw rod.

[0012] The utility model further sets up: the spiral strip is made of alloy steel, and the spiral strip is formed around the outer thread on the outer periphery of the screw rod.

[0013] Through the technical scheme, the spiral strip can be limited in the outer thread and the height of the spiral strip filling the outer thread can be adjusted according to the thickness of the parts.

[0014] The utility model further sets up: the cavity that is identical with the shape of nut is set up in the nut sleeve, the inner diameter of the extension cylinder is greater than the outer diameter of the bolt, and the bolt can penetrate the nut sleeve.

[0015] Through the technical scheme, the sleeve can change with the change of the position of the nut on the bolt, thereby ensuring that the nut sleeve can be always sleeved on the nut.

[0016] The utility model further sets up: the cross section of the clamping block perpendicular to the bolt axis direction is a polygon, and the cross section of the through slot is identical with the cross section of the clamping block.

[0017] Through the technical scheme, the clamping block of the polygon is clamped into the through slot, so that the nut sleeve cannot rotate, thereby limiting the rotation of the nut, and the nut is prevented from being loosened due to vibration.

[0018] The utility model further sets up: the cross section of the through slot and the clamping block perpendicular to the bolt axis direction is a circle, the diameter of the through slot is greater than the diameter of the clamping block, a rubber layer is fixed on the inner wall of the through slot, and the interval between the inner wall of the through slot and the outer periphery of the clamping block is less than the thickness of the rubber layer.

[0019] Through the technical scheme, the clamping block of the circle is more easily clamped into the through slot, and the elasticity of the rubber and the friction between the clamping block can prevent the nut from rotating.

[0020] The utility model has the beneficial effects that the screw rod penetrates two parts to be connected, the spiral strip is screwed along the outer thread on the screw rod, thereby filling the part of the screw rod between the two parts, the part of the outer thread is supported by the spiral strip, thereby enhancing the bending strength of the part of the screw rod, the clamping block is clamped into the through slot, thereby limiting the rotation of the nut, and the nut is prevented from being reversed due to vibration, thereby ensuring the connection strength of the bolt and the nut. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of the utility model;

[0022] Figure 2 is a sectional view of the utility model;

[0023] Figure 3 is a sectional view of the utility model Figure 2 is an enlarged schematic view of B in the middle;

[0024] Figure 4 is the explosion schematic view of the first embodiment of the utility model;

[0025] Figure 5 is the explosion schematic view of the second embodiment of the utility model;

[0026] Figure 6 is the sectional view of the sleeve and the nut sleeve of the utility model.

[0027] In the drawings:

[0028] 10, bolt; 11, nut; 12, clamping block; 20, nut sleeve; 21, sleeve; 22, through slot; 23, extension cylinder; 30, spiral strip. DETAILED DESCRIPTION

[0029] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the drawings attached Figure 1 The orientation or position relationship indicated is only for the convenience of the simplified description of the utility model, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In order to make the purpose and advantages of the utility model more clear and explicit, the utility model is specifically described below in combination with embodiments, and it should be understood that the following text is only used to describe one or several specific embodiments of the utility model, and does not strictly limit the protection scope specifically requested by the utility model, such as in this text, the terms up and down and left and right are not limited to their strict geometric definitions, but include reasonable and inconsistent tolerances for machining or human error, and the specific characteristics of the high-strength precision mechanical parts are described in detail as follows:

[0031] First embodiment:

[0032] Referring to Figures 1-4 And Figure 6The utility model provides high strength precision machinery spare parts, including bolt 10 and nut 11, bolt 10 and nut 11 are all made of high carbon steel, to ensure the strength of fastener, bolt 10 is composed of head and screw rod, is provided with a plurality of helical strips 30 that can slide along its outer thread on the outer periphery of screw rod, nut 11 is provided with nut cover 20, nut cover 20 can reduce the rainwater and enter the gap between the screw rod and spare part along the outer thread, reduce the probability of rust of screw rod in spare part, ensure its connection strength, nut cover 20 is fixed with extension cylinder 23, extension cylinder 23 is slidably connected with sleeve 21, nut cover 20, sleeve 21, extension cylinder 23 are all made of stainless steel, is fixed with two limit strips that are outward convex and parallel to the axis of extension cylinder 23 on the outer periphery of extension cylinder 23, is provided with two limit grooves corresponding with limit strip on the inner wall of sleeve 21, limit strip slides in limit groove, to this limit the relative rotation between sleeve 21 and extension cylinder 23, limit block is outward protruding on the upper end of limit strip, the bottom wall of limit groove is outward recessed and forms recess, limit block slides in recess, to this limit the relative sliding distance between sleeve 21 and extension cylinder 23, the end away from nut cover 20 of sleeve 21 is provided with through groove 22, the end away from head of screw rod is fixed with clamping block 12 that can be clamped into through groove 22, the bottom of outer thread on the outer periphery of screw rod is sequentially connected with the straight line segment of its two sides and the circular segment and forms, the straight line segment of bottom is tangent to circular segment, the cross section of helical strip 30 is identical with the cross section shape of outer thread on screw rod, the straight line segment of bottom is perpendicular to the axis of bolt 10, so that when outer thread extrudes helical strip 30, ensure that helical strip 30 is still in outer thread and plays the role of supporting outer thread, helical strip 30 is made of alloy steel, helical strip 30 forms a circle around outer thread on the outer periphery of screw rod, nut cover 20 is provided with cavity that is identical with the shape of nut 11, the inner diameter of extension cylinder 23 is greater than the outer diameter of bolt 10, bolt 10 can penetrate nut cover 20, in the embodiment, the cross section of clamping block 12 perpendicular to the axis direction of bolt 10 is regular hexagon, the cross section of through groove 22 is identical with the cross section of clamping block 12.

[0033] When connecting spare parts, the screw rod part of bolt 10 passes through the hole of two spare parts, the head of bolt 10 abuts with one of the spare parts, then according to the thickness of two spare parts, select the corresponding thickness helical strip 30, and make helical strip 30 move along the outer thread screw from one end of screw rod to the hole of spare part, thereby supporting the outer thread part of screw rod in hole, until the last helical strip 30 is flush with the surface of another spare part, at this time, nut 11 is screwed along screw rod to abut with the surface of the spare part and is tightened.

[0034] Then the nut sleeve 20 is sleeved on the nut 11, the bolt 10 penetrates the nut sleeve 20 and the extension cylinder 23, and the clamping block 12 is clamped into the through slot 22, so as to limit the rotation of the nut 11, avoid the nut 11 from being reversed due to vibration, and cause the connection to fail. If the angle between the clamping block 12 and the through slot 22 is deviated when the nut 11 is tightened, a washer is added between the nut 11 and the part, so as to adjust the relative angle between the clamping block 12 and the through slot 22, and reduce the wear of the nut 11 when being tightened.

[0035] Second embodiment:

[0036] With reference to Figure 5 The difference from the first embodiment is that the cross section of the through slot 22 and the clamping block 12 perpendicular to the axis direction of the bolt 10 is circular, the diameter of the through slot 22 is larger than that of the clamping block 12, a rubber layer is fixed on the inner wall of the through slot 22, and the interval between the inner wall of the through slot 22 and the outer periphery of the clamping block 12 is smaller than the thickness of the rubber layer.

[0037] After the nut 11 is tightened, the nut sleeve 20 is sleeved on the nut 11, and the circular clamping block 12 is clamped into the circular through slot 22. Since the rubber layer on the inner wall of the through slot 22 is elastic, after the clamping block 12 is clamped into the through slot 22, the through slot 22 is deformed, and there is a large friction force between the through slot 22 and the outer periphery of the clamping block 12, so as to avoid the nut 11 from being reversed in the vibration and causing the connection to fail.

[0038] Those skilled in the art can make various modifications to the above embodiments without departing from the overall spirit and concept of the present application. All of them fall within the protection scope of the present application. The protection scheme of the present application is subject to the claims attached to the present application.

Claims

1. High-strength precision mechanical parts, comprising a bolt (10) consisting of a head and a shank, and a nut (11), characterized in that: The screw rod is provided with a plurality of helical strips (30) which can slide along the external thread of the screw rod, the nut (11) is provided with a nut sleeve (20), the nut sleeve (20) is fixed with an extension cylinder (23), the extension cylinder (23) is slidably connected with a sleeve (21), the end of the sleeve (21) away from the nut sleeve (20) is provided with a through slot (22), and the end of the screw rod away from the head is fixed with a clamping block (12) which can be clamped into the through slot (22).

2. The high strength precision machine component of claim 1, wherein: The tooth base of the external thread on the outer periphery of the screw rod is formed by connecting a circular arc segment and straight line segments on both sides of the circular arc segment in sequence.

3. The high strength precision machine component of claim 2, wherein: The cross section of the helical strip (30) is consistent with the cross section shape of the external thread on the screw rod.

4. The high-strength precision mechanical component of claim 3, wherein: The helical strip (30) is made of alloy steel, and the helical strip (30) is formed around the external thread on the outer periphery of the screw rod.

5. The high strength precision machine component of claim 1, wherein: The nut sleeve (20) is provided with a cavity which is consistent with the shape of the nut (11), the inner diameter of the extension cylinder (23) is greater than the outer diameter of the bolt (10), and the bolt (10) can penetrate the nut sleeve (20).

6. The high-strength precision mechanical component of claim 5, wherein: The cross section of the clamping block (12) perpendicular to the axis direction of the bolt (10) is a polygon, and the cross section of the through slot (22) is consistent with the cross section of the clamping block (12).

7. The high strength precision mechanical component of claim 5, wherein: The cross section of the through slot (22) and the clamping block (12) perpendicular to the axis direction of the bolt (10) is a circle, the diameter of the through slot (22) is greater than the diameter of the clamping block (12), the inner wall of the through slot (22) is fixed with a rubber layer, and the interval between the inner wall of the through slot (22) and the outer periphery of the clamping block (12) is smaller than the thickness of the rubber layer.

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