Lock bolt for automobile

Abstract

The automobile lock bolt comprises a head part, a screw rod, an expansion rod and a driving part, expansion grooves are formed in the two ends of the screw rod in the axis direction correspondingly, the expansion rod penetrates through the screw rod in the axis direction of the screw rod and is slidably connected to the screw rod, and the other end of the expansion rod is slidably connected to the head part in the axis direction of the screw rod; the driving part is used for driving the expansion rod to slide, and when the driving part drives the expansion rod to slide towards one side of the screw, the two ends of the screw in the axis direction are gradually expanded. The expansion grooves are formed in the two ends of the screw rod respectively, the two ends of the screw rod are expanded at the same time by driving the expansion rod, the two ends of the screw rod in the axis direction are tightly attached to the inner wall of the bolt hole, the contact area between the screw rod and the bolt hole is increased, and therefore the connection strength and the sealing performance of the hole are further enhanced, and the possibility of loosening of the bolt is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt technical field especially is related to a bolt is prevented to be loosened for car. BACKGROUND

[0002] Bolt is the important part of the fastening of car, needs to have higher physical performance. Because the car is driven for a long time, the vibration in the car and the impact force when braking, the bolt will gradually displace, offset, resulting in the whole bolt appears the phenomenon of loosening, thereby shortening the service life of bolt.

[0003] The utility model discloses a kind of automobile tire bolts with publication number CN220302506U, including: body, body includes connecting end and screw head, first thread is provided on the outer side wall surface of connecting end, through hole is provided on the end face of connecting end, through hole is passed to screw head end face, expansion assembly is arranged in through hole;Wherein, through hole includes expansion section, cooperation section and locking section, expansion section is arranged in connecting end, locking section is arranged on screw head, cooperation section is between connecting section and locking section, expansion assembly is arranged in expansion section and extends into locking section by cooperation section.

[0004] The bolt in the above technical scheme is tight in the front end into the bolt hole, the rear end is loose, the rear end still has larger range of motion, long time can cause the front end of bolt in bolt hole loose, even fall off. UTILITY MODEL CONTENTS

[0005] In order to reduce the possibility of bolt loosening, the application provides a bolt is prevented to be loosened for car.

[0006] The bolt is prevented to be loosened for car provided by the application adopts the following technical scheme:

[0007] A bolt is prevented to be loosened for car, including head, screw rod, expansion rod and driving part, the both ends of screw rod axis direction are respectively provided with expansion groove, expansion rod is along the axis direction of screw rod and is slidably connected on screw rod, the other end of expansion rod is slidably connected on head along the axis direction of screw rod, the driving part is used to drive the sliding of expansion rod, when driving part drives expansion rod to slide to screw rod side, the both ends of screw rod axis direction gradually expand.

[0008] By adopting the above technical scheme, by setting expansion groove in the both ends of screw rod respectively, and by driving expansion rod to make the both ends of screw rod expand simultaneously, the both ends of screw rod axis direction are tightly attached to the inner wall of bolt hole, the contact area between screw rod and bolt hole is increased, thereby further enhancing the connection strength and the sealing property to hole, and the possibility of bolt loosening is reduced.

[0009] Preferably, the driving component includes a threaded rod, one end of which is rotatably connected to the expansion rod, and the other end of which is threaded through and connected to the head.

[0010] By adopting the above technical solution, rotating the threaded rod and connecting it to the head via a threaded connection allows the threaded rod to move along its axial direction, thereby moving the expansion rod along with it.

[0011] Preferably, the end of the threaded rod away from the expansion rod has a force-applying groove.

[0012] By adopting the above technical solution, and by opening a force-applying groove, the force can be applied through the force-applying groove to facilitate the rotation of the threaded rod.

[0013] Preferably, the expansion rod has a polygonal axial cross-section.

[0014] By adopting the above technical solution, the expansion rod limits the circumferential movement of the screw and the head, so that when the head is rotated by force, the screw rotates together, and the rotation of the head by force does not affect the movement of the threaded rod.

[0015] Preferably, the expansion rod includes a first mating section, a connecting section, and a second mating section. The connecting section is located between the first mating section and the second mating section, and the first mating section is located at the end of the screw away from the head. The first mating section is gradually narrowed from the end near the connecting section to the end away from the connecting section, and the second mating section is gradually widened from the end near the connecting section to the end away from the connecting section.

[0016] By adopting the above technical solution, the expansion rod is divided into three sections. When the expansion rod moves, the first and second mating sections cause deformation and expansion at both ends of the screw axis, making the deformation at both ends of the screw axis relatively the same. This does not affect the middle end of the screw, reducing the possibility that deformation in the middle section of the screw will affect the deformation at both ends of the screw, thereby reducing the possibility that the bolt will loosen at one end in the bolt hole. Furthermore, the mating sections and the screw together reduce the possibility that the expansion rod will fall off the screw when not in use.

[0017] Preferably, the expansion rod further includes a displacement section located at one end of the second mating section near the head, the displacement section being slidably connected to the head, and the threaded rod being rotatably connected to the end of the displacement section away from the mating section.

[0018] By adopting the above technical solution, the screw and the head are connected through the combination of the displacement section and the threaded rod.

[0019] Preferably, the head is provided with a sliding groove, and the displacement segment is slidably connected in the sliding groove. The axial cross-section of the sliding groove is equal to the maximum cross-section of the mating segment near the second expansion segment. When the expansion rod does not move, the second mating segment is partially located in the sliding groove. When the expansion rod moves to the limit position towards the screw, the second mating segment moves out of the sliding groove.

[0020] By adopting the above technical solution, by making the axial cross-section of the sliding groove equal to the maximum cross-section of the mating section near the second expansion section, when the expansion rod moves, the sliding groove does not affect the movement of the second expansion section. Moreover, when the expansion rod moves to the limit position towards the screw, the deformation at both ends of the screw axis is relatively the same, thereby reducing the possibility of the bolt loosening at one end in the bolt hole.

[0021] The main technical effects of this utility model are reflected in the following aspects:

[0022] 1. This utility model opens expansion grooves at both ends of the screw and drives the expansion rod to expand both ends of the screw simultaneously, so that both ends of the screw in the axial direction are tightly attached to the inner wall of the bolt hole, which increases the contact area between the screw and the bolt hole, thereby further enhancing the connection strength and the sealing of the hole, and reducing the possibility of bolt loosening.

[0023] 2. This utility model divides the expansion rod into three sections. When the expansion rod moves, the first and second mating sections cause deformation and expansion at both ends of the screw axis, making the deformation at both ends of the screw axis relatively equal. This does not affect the middle end of the screw, reducing the possibility that deformation in the middle section will affect the deformation at both ends of the screw, thereby reducing the possibility of the bolt loosening at one end within the bolt hole. Furthermore, the mating sections' cooperation with the screw reduces the possibility of the expansion rod detaching from the screw when not in use.

[0024] 3. By making the axial cross-section of the sliding groove equal to the maximum cross-section of the mating section near the second expansion section, the sliding groove does not affect the movement of the second expansion section when the expansion rod moves. Furthermore, when the expansion rod moves to the limit position towards the screw, the deformation at both ends of the screw axis is relatively the same, thereby reducing the possibility of the bolt loosening at one end in the bolt hole. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the expansion groove structure in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the expansion rod structure according to an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the screw structure according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Head; 11. Sliding groove; 2. Screw; 21. Expansion groove; 3. Expansion rod; 31. First mating section; 32. Connecting section; 33. Second mating section; 34. Displacement section; 4. Driving component; 41. Threaded rod; 42. Force application groove. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0031] This application discloses an anti-loosening bolt for automobiles.

[0032] Reference Figures 1-4 An anti-loosening bolt for automobiles according to this embodiment includes a head 1, a screw 2, an expansion rod 3, and a driving member 4. Expansion grooves 21 are respectively provided at both ends of the screw 2 along the axial direction. The expansion rod 3 passes through and is slidably connected to the screw 2 along the axial direction. The other end of the expansion rod 3 is slidably connected to the head 1 along the axial direction of the screw 2. The driving member 4 is used to drive the expansion rod 3 to slide. When the driving member 4 drives the expansion rod 3 to slide towards one side of the screw 2, both ends of the screw 2 gradually expand along the axial direction.

[0033] Reference Figure 1 , Figure 3 and Figure 4 By opening expansion grooves 21 at both ends of the screw 2 and driving the expansion rod 3 to expand both ends of the screw 2 simultaneously, both ends of the screw 2 in the axial direction are tightly attached to the inner wall of the bolt hole, which increases the contact area between the screw 2 and the bolt hole, thereby further enhancing the connection strength and the sealing of the hole, and reducing the possibility of bolt loosening.

[0034] Reference Figure 1 , Figure 3 and Figure 4 The driving component 4 includes a threaded rod 41, one end of which is rotatably connected to the expansion rod 3, and the other end of which passes through and is threadedly connected to the head 1. Rotating the threaded rod 41, through its threaded connection to the head 1, causes the threaded rod 41 to move along its axial direction, thus moving the expansion rod 3 along with it. A force-applying groove 42 is provided at the end of the threaded rod 41 furthest from the expansion rod 3. The force-applying groove 42 facilitates the rotation of the threaded rod 41 by applying force.

[0035] Reference Figure 1 , Figure 3 and Figure 4The expansion rod 3 has a polygonal axial cross-section. The expansion rod 3 limits the circumferential movement of the screw 2 and the head 1, so that when the head 1 is rotated by force, the screw 2 rotates together, and the rotation of the head 1 by force does not affect the movement of the threaded rod 41.

[0036] Reference Figure 1 and Figure 3 The expansion rod 3 includes a first mating section 31, a connecting section 32, and a second mating section 33. The connecting section 32 is located between the first mating section 31 and the second mating section 33. The first mating section 31 is located at the end of the screw 2 away from the head 1. The first mating section 31 is gradually narrowed from the end near the connecting section 32 to the end away from the connecting section 32. The second mating section 33 is gradually widened from the end near the connecting section 32 to the end away from the connecting section 32.

[0037] Reference Figure 4 and Figure 3 This design divides the expansion rod 3 into three sections. When the expansion rod 3 moves, the first mating section 31 and the second mating section 33 cause deformation and expansion at both ends of the screw 2 along the axial direction, respectively, so that the deformation at both ends of the screw 2 along the axial direction is relatively the same. This design does not affect the middle end of the screw 2, reducing the possibility that deformation of the middle section of the screw 2 will affect the deformation at both ends of the screw 2, thereby reducing the possibility that the bolt will loosen at one end in the bolt hole. Furthermore, through the mating of the mating sections with the screw 2, the possibility that the expansion rod 3 will fall off the screw 2 when not in use is reduced.

[0038] Reference Figure 4 and Figure 3 The expansion rod 3 also includes a displacement section 34, which is located at the end of the second mating section 33 near the head 1. The displacement section 34 is slidably connected to the head 1, and the threaded rod 41 is rotatably connected to the end of the connecting section 32 away from the mating section. The screw 2 and the head 1 are connected by the combination of the displacement section 34 and the threaded rod 41.

[0039] Reference Figure 4 Figure 3 Figure 4 Figure 3 The head 1 has a sliding groove 11, and the displacement section 34 is slidably connected in the sliding groove 11. The axial cross-section of the sliding groove 11 is equal to the maximum cross-section of the mating section near the second expansion section. When the expansion rod 3 is not moving, the second mating section 33 is partially located in the sliding groove 11. When the expansion rod 3 moves towards the screw 2 to its limit position, the second mating section 33 moves out of the sliding groove 11. By making the axial cross-section of the sliding groove 11 equal to the maximum cross-section of the mating section near the second expansion section, when the expansion rod 3 moves, the sliding groove 11 does not affect the movement of the second expansion section. Furthermore, when the expansion rod 3 moves towards the screw 2 to its limit position, the deformation at both ends of the screw 2 along the axial direction is relatively the same, thereby reducing the possibility of the bolt loosening at one end in the bolt hole.

[0040] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. An anti-loosening bolt for automobiles, characterized in that: The device includes a head (1), a screw (2), an expansion rod (3), and a driving component (4). The screw (2) has expansion grooves (21) at both ends along its axial direction. The expansion rod (3) passes through and is slidably connected to the screw (2) along its axial direction. The other end of the expansion rod (3) is slidably connected to the head (1) along its axial direction. The driving component (4) is used to drive the expansion rod (3) to slide. When the driving component (4) drives the expansion rod (3) to slide towards the screw (2), both ends of the screw (2) gradually expand along its axial direction.

2. The anti-loosening bolt for automobiles according to claim 1, characterized in that: The drive component (4) includes a threaded rod (41), one end of which is rotatably connected to the expansion rod (3), and the other end of which is threaded through and threaded to the head (1).

3. The anti-loosening bolt for automobiles according to claim 2, characterized in that: The threaded rod (41) has a force-applying groove (42) at the end away from the expansion rod (3).

4. The anti-loosening bolt for automobiles according to claim 2, characterized in that: The expansion rod (3) has a polygonal axial cross-section.

5. The anti-loosening bolt for automobiles according to claim 4, characterized in that: The expansion rod (3) includes a first mating section (31), a connecting section (32), and a second mating section (33). The connecting section (32) is located between the first mating section (31) and the second mating section (33). The first mating section (31) is located at the end of the screw (2) away from the head (1). The first mating section (31) is gradually narrowed from the end near the connecting section (32) to the end away from the connecting section (32). The second mating section (33) is gradually widened from the end near the connecting section (32) to the end away from the connecting section (32).

6. The anti-loosening bolt for automobiles according to claim 5, characterized in that: The expansion rod (3) further includes a displacement section (34), which is located at the end of the second mating section (33) near the head (1). The displacement section (34) is slidably connected to the head (1), and the threaded rod (41) is rotatably connected to the end of the displacement section (34) away from the mating section.

7. The anti-loosening bolt for automobiles according to claim 6, characterized in that: The head (1) is provided with a sliding groove (11), and the displacement section (34) is slidably connected in the sliding groove (11). The axial cross-section of the sliding groove (11) is equal to the maximum cross-section of the mating section near the second expansion section. When the expansion rod (3) does not move, the second mating section (33) is partially located in the sliding groove (11). When the expansion rod (3) moves to the limit position towards the screw (2), the second mating section (33) moves out of the sliding groove (11).

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