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CN-121977008-A - Fastening device and crawler belt transmission chain system

CN121977008ACN 121977008 ACN121977008 ACN 121977008ACN-121977008-A

Abstract

The application provides a fastening device and a crawler belt transmission chain system. The bolt comprises a bolt head and a screw rod integrally connected with the bolt head, and at least one radial inwards concave locking groove is formed in the locking end, far away from the bolt head, of the screw rod. The tightening member includes a body portion and a collar. The body portion is configured to engage with a threaded shank to secure a secured member located between the bolt head and the body portion. A collar is integrally formed at an end of the body portion remote from the bolt head and extends axially outwardly away from the bolt hole of the body portion, the collar being configured to prevent loosening of the tightening member from the screw by locally punching an edge of the collar radially inwardly into the locking groove with the tightening member tightened onto the fastened member.

Inventors

  • SUN YUHOU
  • SUN CHANGCHUN
  • SUN ZHENXING
  • YANG GUANGWEN

Assignees

  • 福建省晋江市励精汽配有限公司

Dates

Publication Date
20260505
Application Date
20260213

Claims (10)

  1. 1. A fastening device, comprising: The bolt (1) comprises a bolt head (11) and a screw rod (12) integrally connected with the bolt head (11), wherein a locking end (122) of the screw rod (12) far away from the bolt head (11) is provided with at least one locking groove (121) which is recessed inwards in a radial direction, and Screw up piece (2), include: a main body portion (21) configured to be combined with the screw (12) to fasten a fastened member located between the bolt head (11) and the main body portion (21), and A collar (22) integrally formed at an end of the main body portion (21) remote from the bolt head (11) and extending axially outwardly away from the bolt hole of the main body portion (21), the collar (22) being configured to prevent loosening of the tightening member (2) from the screw (12) by locally punching an edge of the collar (22) radially inwardly into the locking groove (121) with the tightening member (2) fastened to the fastened member.
  2. 2. A fastening device according to claim 1, characterized in that the locking groove (121) extends axially from the end face of the locking end (122) towards the bolt head (11).
  3. 3. Fastening device according to claim 1, characterized in that the projection of the locking groove (121) in the axial direction is an arc-shaped, triangular, square or rectangular recess, at least partially accommodating a locking recess (221) formed by locally punching the edge of the collar (22) radially inwards.
  4. 4. The fastening device according to claim 1, characterized in that the collar (22) is adjacent to the radially outer side of the threaded portion of the bolt hole.
  5. 5. A fastening device according to any one of claims 1-4, c h a r a c t e r i z e d in that a number of cleats (112) are provided on the inner annular bonding surface (111) of the bolt head (11), said cleats (112) being adapted to bear against the fastened member and to form a point or line contact with the fastened member to increase the circumferential anti-slip friction of the bolt head (11).
  6. 6. The fastening device according to claim 5, wherein the stud (112) comprises a plurality of curved eccentric ribs or a plurality of ribs extending radially of the annular abutment surface (111).
  7. 7. A track drive chain system for a track-type work vehicle comprising a plurality of drive units linked in series into a loop, each of said drive units comprising: The fastening device of any one of claims 1-6, and a track shoe (300) and chain (400) for use as the fastened; The screw (12) sequentially passes through a first mounting hole (301) formed on the track shoe (300) and a second mounting hole (401) formed on the chain (400) from the track shoe (300) to be in threaded fit with the tightening piece (2).
  8. 8. The track drive chain system of claim 7, wherein a side of the chain (400) facing away from the track shoe (300) is provided with an anti-rotation slot (402), the anti-rotation slot (402) being in communication with the second mounting hole (401) and configured to fit with the body portion (21) and partially receive the body portion (21) to limit rotation of the body portion (21) relative to the chain (400) to mount the track shoe (300) to the chain (400) by rotating a bolt head (11).
  9. 9. The track drive chain system of claim 8, wherein the circumference of the main body portion (21) is surrounded by four planes to form a regular quadrangular prism structure, and two adjacent planes are transited by rounded corners.
  10. 10. The track drive chain system of claim 7, wherein a side of the track shoe (300) facing away from the chain (400) forms at least two anti-slip ribs (302) extending perpendicular to a direction of travel of the drive unit, the bolt head (11) being located between two adjacent anti-slip ribs (302) and not protruding from the anti-slip ribs (302), an outer side of the bolt head (11) facing away from the screw (12) integrally forming a ridge (113) having an arcuate profile in axial section.

Description

Fastening device and crawler belt transmission chain system Technical Field At least one embodiment of the present application relates to a fastening device and a track drive chain system, and more particularly, to a fastening device and a track drive chain system that achieve limited nut loosening relative to a bolt. Background Crawler-type engineering vehicles (such as an excavator) often work under complex working conditions such as mines and capital constructions, and in the related art, a used crawler transmission chain system bears vibration and impact load caused by factors such as rough road running, heavy-load operation, sand collision and the like, and is used for a fastening device for connecting a track shoe and a chain, nuts are easy to rotate, and connection with bolts is easy to loosen. In addition, in order to achieve the anti-loosening effect, the protection is formed by additionally arranging multiple structures such as cotter pins and anti-loosening washers in the related art, so that the installation process of the fastening device is complex, time-consuming and labor-consuming. Disclosure of Invention To solve at least one of the above and other problems in the prior art, embodiments of the present application provide a fastening device and a track drive chain system that can prevent a tightening member from rotating relative to a bolt, so that the fastening device can fasten a track shoe and a chain more stably and reliably. As one aspect of an embodiment of the present application, there is provided a fastening device including a bolt and a tightening member. The bolt comprises a bolt head and a screw rod integrally connected with the bolt head, and at least one radial inwards concave locking groove is formed in the locking end, far away from the bolt head, of the screw rod. The tightening member includes a body portion and a collar. The body portion is configured to engage with a threaded shank to secure a secured member located between the bolt head and the body portion. A collar is integrally formed at an end of the body portion remote from the bolt head and extends axially outwardly away from the bolt hole of the body portion, the collar being configured to prevent loosening of the tightening member from the screw by locally punching an edge of the collar radially inwardly into the locking groove with the tightening member tightened onto the fastened member. According to an embodiment of the application, the locking groove extends axially from the end face of the locking end towards the bolt head. According to an embodiment of the application, the projection of the locking groove in the axial direction is an arc-shaped, triangular, square or rectangular recess, at least partly accommodating a locking recess formed by locally punching the edge of the collar radially inwards. According to an embodiment of the application, the collar is adjacent to the radially outer side of the threaded portion of the bolt hole. According to the embodiment of the application, the annular joint surface on the inner side of the bolt head is provided with a plurality of anti-slip protrusions, and the anti-slip protrusions are suitable for being pressed on the fastened piece and form point contact or line contact with the fastened piece so as to increase the circumferential anti-slip friction force of the bolt head. According to an embodiment of the present application, the anti-slip protrusion includes a plurality of arc-shaped eccentric protrusions or a plurality of protrusions extending in a radial direction of the annular bonding surface. As another aspect of an embodiment of the present application, there is provided a track drive chain system for use with a track-type work vehicle, comprising a plurality of drive units sequentially linked in a loop, each drive unit comprising a fastening device, and a track shoe and chain for being fastened. The screw rod sequentially passes through a first mounting hole formed in the track plate and a second mounting hole formed in the chain from the track plate to be in threaded fit with the tightening piece. According to an embodiment of the application, an anti-rotation groove is provided on a side of the chain facing away from the track shoe, the anti-rotation groove being in communication with the second mounting hole and being configured to fit with and partially receive the main body portion to limit rotation of the main body portion relative to the chain, whereby the track shoe is mounted to the chain by rotating the bolt head. According to the embodiment of the application, the circumference of the main body part is enclosed by four planes to form a regular quadrangular prism structure, and two adjacent planes are in transition through round corners. According to the embodiment of the application, at least two anti-slip ribs extending perpendicular to the travelling direction of the transmission unit are formed on one side of the track shoe, which is awa