Anti-rust fastening connecting pin suitable for hinging

Abstract

The invention discloses an anti-rust fastening connecting pin suitable for hinging. The anti-rust fastening connecting pin is composed of a pin, a wear-resistant sleeve, a limiting gasket and a lantern ring. After the pin rod of the pin is sequentially sleeved with the wear-resistant sleeve and the limiting gasket, the pin rod is riveted and fixed with the lantern ring; the two ends of the wear-resistant sleeve are embedded into the pin cap and the limiting gasket respectively to be in clearance fit connection with the pin cap. The problem that rotation cannot be achieved due to the fact that an existing railway wagon round pin and a lever mounting hole are corroded seriously can be effectively solved, and even if the abrasion-resistant sleeve and the lever mounting hole are corroded and cannot rotate, the pin rod of the pin and the abrasion-resistant sleeve can still keep a good rotation function. By means of the ring groove rivet connection principle, the situation that the wear-resisting sleeve is disengaged from the limiting gasket due to the fact that the limiting gasket retreats due to connection looseness is prevented, a relatively good sealing environment is kept between the whole pin rod and the wear-resisting sleeve, the outer surface of the pin rod and the inner surface of the wear-resisting sleeve are prevented from being rusted, and therefore normal use of the rotation function is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting and fastening, in particular to the technical field of design and production of rivets, and specifically relates to a rust-proof fastening connecting pin suitable for hinged connection. Background Art

[0002] The bogie is a key component for the operation of railway freight cars, and the brake shoe connected to the basic brake device is used to achieve braking action. The basic brake is composed of a brake beam, a fixed lever, a floating lever, a brake shoe assembly, a fulcrum seat and a round pin. The round pin plays an important role in it. The round pin is used as a fulcrum to amplify the braking force provided by the brake cylinder, and the braking is transmitted to the brake shoe assembly through the brake beam. However, the operating conditions of railway freight cars are complex. When running in some humid areas, the round pin and the mounting hole on the lever will rust. Once the rust is severe, the lever will not move smoothly or cannot move. If the lever does not move, the railway freight car will not brake or relieve during operation, which will bring huge safety hazards to the operation of railway freight cars, and the consequences are disastrous.

[0003] The existing railway freight car basic brakes mainly use flat hole round pins for connection. This problem is alleviated by selecting longer round pins to increase the axial movement of the round pins. Through the vibration during the operation of the railway freight car, the round pins are caused to move axially, and the rust residue is brought out to prevent the accumulation of rust and cause jamming. However, this technology will accelerate the wear of the round pins and the mounting holes on the levers, reducing their service life; after this technology has been used for a period of time, the wear-resistant layer on the surface of the round pins is completely corroded, and the wear of the round pins will increase while the strength will also be reduced. At the same time, if the vehicle is stationary for a long time, there is still a risk of rust. Therefore, this technology cannot effectively solve the problem of the basic braking system being stuck due to rust, and there are still hidden dangers of safety accidents caused by this during the operation of railway freight cars. Summary of the invention

[0004] The present invention discloses a rust-proof fastening connecting pin suitable for hinged connection in view of the deficiencies of the prior art. The problem to be solved by the present invention is to provide a rust-proof fastening connecting pin for hinged connection which can still maintain the ability to rotate after rusting between the round pin and the lever, so as to prevent the railway freight car basic brake device from being unable to operate due to rusting.

[0005] The present invention is achieved through the following technical solutions:

[0006] A rust-proof and dead-fastening connecting pin suitable for hinged connection, the other characteristics are: it is composed of a pin, a wear-resistant sleeve, a limit washer and a collar; after the wear-resistant sleeve and the limit washer are sequentially mounted on the pin rod, the pin rod and the collar are riveted and fixed; the wear-resistant sleeve and the pin rod are clearance-matched, and the two ends of the wear-resistant sleeve are respectively embedded in the pin head and the limit washer for clearance-matched connection.

[0007] The pin of the present invention comprises a head, a pin rod, a locking groove and a tail tooth arranged in sequence; a circular sealing groove is arranged on the inner side of the head along the circumference of the pin rod for embedding the end of the wear-resistant sleeve; the pin rod is a bare rod structure;

[0008] The wear-resistant sleeve of the present invention is a sleeve of cylindrical structure, and the inner diameter of the wear-resistant sleeve matches the diameter of the pin rod to achieve clearance fit; the length of the wear-resistant sleeve is greater than the length from the end of the pin rod to the inner end face of the head, and less than the length from the end of the pin rod to the bottom of the sealing groove;

[0009] The inner hole of the limiting washer of the present invention is provided with large and small diameter through holes along the axial direction to form limiting grooves arranged along the radial direction of the hole; the diameter of the large diameter hole matches the outer diameter of the wear-resistant sleeve to achieve clearance fit and limit the wear-resistant sleeve, and the diameter of the small diameter hole matches the diameter of the front end rod of the pin locking groove to achieve clearance fit; after the pin rod and the collar are riveted and fixed, the radial surface of the limiting groove is tightly matched and fixed with the end surface of the pin rod;

[0010] The sleeve ring of the present invention comprises a sleeve and a flange, the sleeve section is fastened and connected with the locking groove by riveting and extrusion, and the front end surface of the flange is pressed and fixed with the contact end surface of the limiting washer.

[0011] Furthermore, a circle of annular steps arranged around the corner of the annular limiting groove is provided in the limiting groove of the limiting washer; one end of the wear-resistant sleeve is a matching step structure; the joint between the wear-resistant sleeve and the limiting washer is a clearance fit in which two steps are embedded in each other.

[0012] Furthermore, the side wall of the large diameter hole of the limiting washer is a slope that gradually decreases in diameter from the outside to the inside, forming a stepped groove structure, and the outer wall of the end of the wear-resistant sleeve is a slope that matches the slope of the stepped groove, forming a stepped protrusion structure, and the joint between the wear-resistant sleeve and the limiting washer is a clearance fit in which the two slopes are combined with each other.

[0013] The difference between the total length of the wear-resistant sleeve of the present invention and the length from the end of the pin rod to the bottom of the pin sealing groove is less than or equal to 1 mm.

[0014] The sealing groove has a depth greater than 1.5 mm.

[0015] Furthermore, grease is coated in the gap between the peripheral surface of the pin rod and the wear-resistant sleeve. The thickness of the wear-resistant sleeve is 2 to 6 mm, and the hardness is 45 to 55 HRC. The roughness of the pressure-bearing surface of the limit washer and the end face of the collar flange is less than Ra3.2. The clearance fit parameters between the wear-resistant sleeve and the pin rod are H8 / f7; the clearance fit parameters between the outer wall of the wear-resistant sleeve and the contact part of the pin sealing groove and the limit washer are H8 / d8.

[0016] The connecting pin of the present invention enables the pin body of the connecting pin to have a rotation function without reducing the connection strength of the connecting pin, so that the connecting pin can still rotate smoothly when it is rusted with the lever.

[0017] The present invention can effectively avoid the problem of the inability to rotate due to serious corrosion of the existing railway freight car round pin and the mounting hole on the lever. Even if the wear-resistant sleeve and the mounting hole of the lever are corroded and cannot rotate, the pin rod of the pin can still maintain a good rotation function with the wear-resistant sleeve. The present invention uses the ring groove rivet connection principle to prevent the limit washer from being withdrawn due to loose connection, so that the wear-resistant sleeve is separated from the limit washer, so that a relatively good sealing environment is maintained between the entire pin rod and the wear-resistant sleeve, and the outer surface of the pin rod and the inner surface of the wear-resistant sleeve are prevented from rusting, thereby ensuring the normal use of the rotation function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a half-section structure of a connecting pin of the present invention;

[0019] Figure 2 It is a schematic diagram of a half-section structure of a connecting pin of the present invention;

[0020] Figure 3 It is a schematic cross-sectional view of the wear-resistant sleeve of the connecting pin of the present invention;

[0021] Figure 4 It is a schematic diagram of the end face of the wear-resistant sleeve of the connecting pin of the present invention;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the connection pin limiting washer of the present invention;

[0023] Figure 6 It is a schematic diagram of the connecting pin collar of the present invention;

[0024] Figure 7 It is a schematic diagram of the end face of the connecting pin and sleeve ring of the present invention;

[0025] Figure 8 This is a schematic diagram of the matching type of the connecting pin wear sleeve and the limiting washer of the present invention. Figure 2 ;

[0026] Fig. 9 This is a schematic diagram of the matching type of the connecting pin wear sleeve and the limiting washer of the present invention. Figure 3 ;

[0027] Fig.10 It is a schematic diagram of the matching of the connecting pin components of the present invention.

[0028] In the figure, 1 is the pin, 2 is the wear-resistant sleeve, 3 is the limit washer, 4 is the collar; 1.1 is the protrusion, 1.2 is the sealing groove, 1.3 is the pin rod, 1.4 is the locking groove, 1.5 is the tail tooth; 2.1 is the working section, 2.2 is the sealing section; 3.1 is the pressure-bearing surface, 3.2 is the limit groove, 3.3 is the sealing section; 4.1 is the sleeve, 4.2 is the flange, 43 is the latch tooth, 4.4 is the circular protrusion, L is the axial length of the wear-resistant sleeve, P represents the clearance fit between the pin rod and the wear-resistant sleeve, H1 is the total length of the nail rod pin, H2 is the length from the inner surface of the nail rod pin protrusion to the end of the pin, n is the sealing groove depth, and m is the difference in total length between the wear sleeve and the nail rod pin. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0030] Combined with the attached pictures.

[0031] As shown in the figure, the present invention is a rust-proof fastening connecting pin suitable for hinge, which includes a pin 1, a wear-resistant sleeve 2, a limiting washer 3, and a collar 4.

[0032] The pin comprises a protruding head 1.1, a sealing groove 1.2, a pin rod 1.3, a locking groove 1.4, and a tail tooth 1.5.

[0033] The wear-resistant sleeve comprises a working section 2.1 and a sealing section 2.2.

[0034] The limiting gasket comprises a pressure-bearing surface 3.1, a limiting groove 3.2, and a sealing section 3.3 structure.

[0035] The collar comprises a sleeve 4.1, a flange 4.2, a latching tooth 4.3 and a circular protrusion 4.4.

[0036] The cooperation between the wear-resistant sleeve 2, the pin 1 and the limiting washer 3 during the application of the connecting pin assembly of the present invention has the following characteristics:

[0037] After the connecting pin assembly of the present invention is assembled, the cooperation between the wear-resistant sleeve 2, the pin 1 and the limiting washer 3 should meet the following requirements: the total length L of the wear-resistant sleeve 2 is greater than the length H2 from the end of the pin rod 1.3 to the inner end face of the pin head 1.1, and is less than the length H1 from the end of the pin rod 1.3 to the bottom of the pin sealing groove 1.2, and the length difference m between the total length L of the wear-resistant sleeve 2 and the length H1 from the end of the pin rod 1.3 to the bottom of the pin sealing groove 1.2 should be less than or equal to 1 mm, and the depth of the pin sealing groove 1.2 is n.

[0038] In the above relationship: H1>L>H2, H1-H2=n, H1-L=m, m≤1mm, such as Fig.10 shown.

[0039] The above relationship is the best matching design of the embodiment of the present invention. When H1>L>H2 (i.e. n>m) is not satisfied, there may be a risk of the wear-resistant sleeve coming out during use, resulting in limited rotation function. In order to further optimize this implementation scheme, the m value should be less than 1mm to prevent the wear-resistant sleeve and the pin from moving in a large range in the axial direction, effectively prevent the wear of the inner hole of the wear-resistant sleeve, and at the same time prevent the limit washer from being damaged by axial impact to a certain extent.

[0040] After the connecting pin assembly of the present invention is assembled, the wear-resistant sleeve 2 and the pin rod 1.3 should be clearance fit P. In this example, the recommended fit parameter is H8 / f7;

[0041] In order to improve the corrosion resistance of the product, the wear-resistant sleeve 2 should be made of high-strength wear-resistant material. Generally, the thickness of the wear-resistant sleeve 2 should be 2-6 mm. If alloy steel is used, the hardness of the wear-resistant sleeve 2 should be 45-55 HRC.

[0042] In order to improve the rotation performance of the product, grease can be added to the gap between the peripheral surface of the pin rod 1.3 and the wear-resistant sleeve 3.

[0043] In order to improve the corrosion resistance of the product, the depth n of the sealing groove 1.2 is greater than 1.5mm; the roughness of the pressure-bearing surface of the limit washer 3 and the flange end face of the collar 4 should not be greater than Ra3.2; the contact part between the outer wall of the wear-resistant sleeve 3 and the pin sealing groove 1.2 and the limit washer 3 should adopt a clearance fit. In this example, the recommended fit parameter is H8 / d8.

[0044] The wear-resistant sleeve 2 can slide slightly in the axial direction and can rotate relative to the pin 1 around the central axis. The connection and matching method of the wear-resistant sleeve 2 and the pin 1 or the limiting washer 3 is not limited to the method given in the present invention;

[0045] Figure 1 , Figure 5 The limiting groove 3.2 of the limiting washer 3 shown is a right-angle step structure, the end of the wear-resistant sleeve 2 is an arc structure, and the joint between the wear-resistant sleeve 2 and the limiting washer 3 is a side clearance fit;

[0046] Figure 8 Another matching structure of the wear-resistant sleeve 2 and the limiting washer 3 of the connecting pin is shown. The limiting groove 3.2 of the limiting washer 3 is a two-step structure. The end of the wear-resistant sleeve 2 is a matching two-step structure. The joint of the wear-resistant sleeve 2 and the limiting washer 3 is a clearance match in which the two steps are embedded in each other.

[0047] Fig. 9Another connecting pin wear-resistant sleeve 2 and limiting washer 3 matching structure is shown. The side wall of the limiting groove 3.2 of the limiting washer 3 is a slope that gradually inclines from the outside to the inside, forming a limiting groove 3.2 of a step groove structure. The outer wall of the end of the wear-resistant sleeve 2 is a slope that matches the step slope, forming a joint of the raised step structure. The joint between the wear-resistant sleeve 2 and the limiting washer 3 is a clearance fit in which the two slopes are combined with each other.

Claims

1. A rust-proof fastening connecting pin suitable for hinge, characterized in that: It consists of a pin, a wear-resistant sleeve, a limit washer and a collar; after the wear-resistant sleeve and the limit washer are sequentially mounted on the pin rod, the pin rod and the collar are riveted and fixed; the wear-resistant sleeve and the pin rod are clearance-matched, and the two ends of the wear-resistant sleeve are respectively embedded in the pin head and the limit washer for clearance-matched connection.

2. The rust-proof fastening connecting pin suitable for hinged connection according to claim 1, characterized in that: The pin comprises a head, a pin rod, a locking groove and a tail tooth arranged in sequence; a circular sealing groove is arranged on the inner side of the head along the circumference of the pin rod for embedding the end of the wear-resistant sleeve; the pin rod is a bare rod structure; The wear-resistant sleeve is a sleeve of cylindrical structure, and the inner diameter of the wear-resistant sleeve matches the diameter of the pin rod to achieve clearance fit; the length of the wear-resistant sleeve is greater than the length from the end of the pin rod to the inner end face of the head, and less than the length from the end of the pin rod to the bottom of the sealing groove; The inner hole of the limiting washer is provided with large and small diameter through holes along the axial direction to form limiting grooves arranged along the radial direction of the hole; the diameter of the large diameter hole matches the outer diameter of the wear-resistant sleeve to achieve clearance fit and limit the wear-resistant sleeve, and the diameter of the small diameter hole matches the diameter of the front end rod of the pin locking groove to achieve clearance fit; after the pin rod and the collar are riveted and fixed, the radial surface of the limiting groove is tightly matched and fixed with the end surface of the pin rod; The sleeve ring comprises a sleeve and a flange, the sleeve section is fastened and connected with the locking groove by riveting and extrusion, and the front end surface of the flange is pressed and fixed with the contact end surface of the limiting washer.

3. According to claim 2, the rust-proof fastening connecting pin suitable for hinged connection has other characteristics: a circle of annular steps arranged around the corner of the annular limiting groove is also provided in the limiting groove of the limiting washer; one end of the wear-resistant sleeve is a matching step structure; the joint between the wear-resistant sleeve and the limiting washer is a clearance fit in which two steps are embedded in each other.

4. The rust-proof fastening connecting pin suitable for hinges according to claim 2 has other characteristics: the side wall of the large-diameter hole of the limiting washer is a slope that gradually decreases from the outside to the inside to form a stepped groove structure, the outer wall of the end of the wear-resistant sleeve is a slope that matches the slope of the step groove to form a step protrusion structure, and the joint between the wear-resistant sleeve and the limiting washer is a clearance fit in which the two slopes are combined with each other.

5. The rust-proof fastening connecting pin suitable for hinged connection according to any one of claims 1 to 4, wherein the difference between the total length of the wear-resistant sleeve and the length from the end of the pin rod to the bottom of the pin sealing groove is less than or equal to 1 mm.

6. The rust-proof fastening connecting pin suitable for hinged connection according to claim 5, wherein the depth of the sealing groove is greater than 1.5 mm.

7. The rust-proof fastening connecting pin suitable for hinged connection according to claim 5 is further characterized in that grease is coated in the gap between the peripheral surface of the pin rod and the wear-resistant sleeve.

8. The anti-rusting fastening connecting pin suitable for hinged connection according to claim 5, further characterized in that: the wear-resistant sleeve has a thickness of 2 to 6 mm and a hardness of 45 to 55 HRC.

9. The rust-proof fastening connecting pin suitable for hinged connection according to claim 5 is characterized in that the roughness of the pressure-bearing surface of the limiting washer and the end surface of the collar flange is less than Ra3.

2.

10. According to the rust-proof fastening connecting pin suitable for hinged connection described in claim 5, other characteristics are: the clearance fit parameter between the wear-resistant sleeve and the pin rod is H8 / f7; the clearance fit parameter between the outer wall of the wear-resistant sleeve and the contact part of the pin sealing groove and the limiting washer is H8 / d8.

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