Self-locking gear box structure with reinforced braking part

Abstract

The utility model relates to a self-locking gear box structure with a reinforced braking part, which comprises a mounting shell, a first gear and a second gear meshed with the first gear are arranged in the mounting shell, the second gear is connected onto a gear shaft, an elastic piece is connected onto the second gear, and a locking block is movably connected onto the second gear. A plurality of braking grooves distributed in the circumferential direction of the gear shaft are formed in the inner surface of the mounting shell, the locking block is provided with a braking part and an unlocking part, the elastic element is used for driving the braking part to be inserted into the braking groove so as to prevent the second gear from rotating, and a thickening block is arranged on the side, away from the end face of the second gear, of the locking block; and a step for forming the braking part is formed between the thickening block and the locking block. According to the self-locking gear box structure provided with the reinforced braking part, the locking part is not prone to being torn, and the problem that the locking part of an existing self-locking gear box is prone to being torn is solved.

Description

Technical Field

[0001] The utility model relates to a lifting component, in particular to a self-locking gear box structure with a reinforced braking part. Background Art

[0002] In order to adjust the height of tables and chairs, the support legs of the tables and chairs are designed as lifting structures. One of the design structures designs the support legs into two parts, a threaded sleeve is fixed on one part, and a rotatable screw (shaft) is suspended on the other part. The screw is threadedly connected in the threaded sleeve, and the table top or chair seat is connected to the threaded sleeve. The screw is driven by a motor or manually rotated to rotate the screw so that the threaded sleeve is raised and lowered on the screw to achieve the lifting of the table and chair. Corresponding to the motor drive method, the motor brake can be used to prevent the screw from rotating so that the position of the threaded sleeve is different, so that the table and chair are maintained at the current height. If the height is adjusted by manually driving the screw to rotate, a self-locking gear box needs to be designed after the height is adjusted to prevent the height of the table top seat from being reduced due to the load. The existing self-locking gear box locking gear has a high manufacturing cost. Utility Model Content

[0003] The utility model aims to provide a self-locking gear box structure with a reinforced braking part and a locking part which is not easy to tear, thereby solving the problem that the locking part of the existing self-locking gear box is easy to tear.

[0004] The above technical problems are solved by the following technical solutions: a self-locking gear box structure with a reinforced braking part, characterized in that it includes a mounting shell, the mounting shell is provided with a screw mounting hole, a first gear and a second gear meshing with the first gear are provided in the mounting shell, the first gear is used to connect with the screw inserted in the screw mounting hole to drive the screw to rotate, the second gear is connected to the gear shaft, the gear shaft is rotatably connected in the mounting shell and at least one end is exposed to the mounting shell, a driving hole is provided on the end surface of the gear shaft, an elastic member and a locking block are connected to the second gear, and a plurality of gears are provided on the inner surface of the mounting shell along the circumference of the gear shaft. The brake groove of the cloth, the locking block is provided with a braking part and an unlocking part, the elastic member is used to drive the braking part to be inserted into the braking groove so as to prevent the second gear from rotating, the gear shaft is provided with a connecting hole connecting the outer peripheral surface of the gear shaft and the driving hole, when the braking part is inserted into the braking groove for braking, the unlocking part is penetrated in the connecting hole, the driving hole is for the release member to be inserted to drive the unlocking part so as to make the braking part escape from the braking groove, when the braking part is located outside the braking groove, the elastic member is in an energy storage state, the locking block is provided with a thickening block on the side away from the end face of the second gear, and a step constituting the braking part is formed between the thickening block and the locking block. When the screw rod needs to be rotated, the release member is inserted into the driving hole and has an unlocking part, so that the braking part escapes from the braking groove, the gear shaft is rotated to drive the second gear to rotate, the second gear drives the first gear to rotate, and the first gear drives the screw rod to rotate, so that the screw rod drives the component threadedly connected to the screw rod to translate along the extension direction of the screw rod. After the release member is pulled out, when the second gear rotates until the braking part is aligned with a prepared groove, the braking part is inserted into the prepared groove under the action of the elastic member, so that the second gear cannot rotate, thereby braking the screw rod and preventing it from rotating. The elastic member can be a spring, a spring sheet, a rubber block, etc.

[0005] Preferably, the gear shaft comprises a first shaft section and a second shaft section connected together at one end, and the second gear is integrally formed on the first shaft section, so that when locked, the locking block is not prone to breakage due to force.

[0006] Preferably, the second gear is a plastic part made by jet, so that the second gear can be made with high strength while the increase in manufacturing cost is low.

[0007] Preferably, the first shaft section is provided with a large diameter section and a small diameter section, the large diameter section is located between the small diameter section and the large diameter section, the second gear is connected between the large diameter section and the small diameter section, the driving hole passes through the first shaft section, the inner circumference of the large diameter section is provided with a groove of the first shaft section that passes through the end face of the large diameter section away from one end of the small diameter section, the groove passes through the end face of the second gear connected to the small diameter section to form the connecting hole. It is convenient to make the connecting hole.

[0008] Preferably, the locking block is provided with a hook at one end of the connecting hole, the hook is inserted into the portion of the groove on the second gear, and the locking block is rotatably connected to the end face of the second gear via a cylindrical head, so that the locking block is not easily displaced during assembly.

[0009] Preferably, the unlocking portion is provided with a guide surface for contacting with the release member to guide the unlocking portion to shrink toward the communicating hole, so that the release member can reliably drive the unlocking portion to make the braking portion escape from the braking groove.

[0010] Preferably, the driving hole passes through the gear shaft, both ends of the gear shaft are exposed from the mounting shell, and both ends of the unlocking portion along the axial direction of the gear shaft are provided with the guide surface, so that the release member can be unlocked by inserting it from either end of the driving hole, which improves the convenience of unlocking.

[0011] Preferably, one end of the guide surface is located outside the space surrounded by the wall surface of the driving hole. After the release member is inserted into the driving hole, it can contact the guide surface without alignment, which improves the convenience of use.

[0012] Preferably, the mounting shell comprises a box body with a gear mounting port and a cover plate detachably connected to the box body and covering the gear mounting port, the cover plate is provided with an escape through hole for inserting a release member, a plurality of connection pits are provided on the end face of one end of the box body with the gear mounting port, the cover plate is provided with connection ears correspondingly inserted into the connection pits, and the connection ears are connected to the connection pits by connecting bolts. It is convenient for assembly and maintenance. When a force is generated to rotate the second gear during the locking process, the connection between the cover plate and the box body is not easy to be torn, thereby improving the load capacity of the utility model after locking.

[0013] Preferably, the surface of the connecting ear connected to the box body extends beyond the inner surface of the cover plate toward the side where the box body is located, so as to further improve the load capacity after locking.

[0014] Preferably, the driving hole is a prism hole, the release piece is a prism with the same number of prisms as the driving hole, and the release piece can drive the gear shaft to rotate after being inserted into the driving hole. The rod body that can drive the gear shaft to rotate also serves as the release piece.

[0015] The utility model has the following advantages: it is convenient to unlock, the release piece can be used as a rocker to drive the gear to rotate; the cost increase when the gear strength is improved is small; and the locking part is not easy to tear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a second gear and a locking component;

[0017] Figure 2 This is a schematic diagram of the utility model after the installation shell is removed;

[0018] Figure 3 It is a structural schematic diagram of the utility model;

[0019] Figure 4 is a schematic diagram of a cover plate, a second gear and a gear shaft;

[0020] Figure 5 is a schematic diagram of the second gear and the first shaft segment;

[0021] Figure 6 Schematic diagram of the cover and locking components.

[0022] In the figure: mounting shell 1, box body 3, cover plate 4, avoidance through hole 5, connecting pit 6, connecting ear 7, surface 9 on the side where the connecting ear is connected to the box body, inner surface 10 of the cover plate, screw 11, support bearing 12, first gear 13, second gear 14, gear shaft 15, drive hole 16, connecting hole 17, first shaft section 18, second shaft section 19, large diameter section 20, small diameter section 21, groove 22, elastic member 23, locking block 24, braking convex tooth 25, braking groove 26, base ring 27, unlocking part 29, braking part 30, thickening block 31, guide surface 32, one end of the guide surface 33, hook head 34, first abutting surface 35, second abutting surface 36, cylindrical head 37. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figures 1 to 6 A self-locking gear box structure with a reinforced braking part includes a mounting shell 1. The mounting shell includes a box body 3 with a gear mounting port and a cover plate 4 detachably connected to the box body to cover the gear mounting port. The cover plate is provided with an escape through hole 5 for inserting a release member. A plurality of connecting pits 6 are provided on the end surface of one end of the box body with the gear mounting port, and a connecting ear 7 correspondingly inserted into the connecting pit is provided on the cover plate. The connecting ear is connected by a connecting bolt ( Figure 5The connecting ear is connected to the housing (not shown) in the connecting pit. The surface 9 of the connecting ear connected to the housing extends beyond the inner surface 10 of the cover plate toward the housing side. The mounting shell is provided with a screw mounting hole, and the screw 11 is supported in the screw mounting hole by a support bearing 12. A first gear 13 and a second gear 14 meshed with the first gear are provided in the mounting shell, and the first gear is used to connect with the screw inserted in the screw mounting hole to drive the screw to rotate. The second gear is connected to the gear shaft 15, and the gear shaft is rotatably connected in the mounting shell and at least one end is exposed to the mounting shell (in this embodiment, the gear shaft is exposed to the mounting shell at both ends). The avoidance through hole is aligned with the gear shaft. A drive hole 16 is provided on the end face of the gear shaft. The drive hole passes through the gear shaft. A connecting hole 17 is provided on the gear shaft to connect the outer peripheral surface of the gear shaft and the drive hole. The gear shaft includes a first shaft section 18 and a second shaft section 19 connected together at one end, and the second gear is integrally formed with the first shaft section. Specifically, the second gear and the first shaft section are plastic parts made by jet. The first shaft section is provided with a large diameter section 20 and a small diameter section 21, the large diameter section is located between the small diameter section and the large diameter section, and the second gear is connected between the large diameter section and the small diameter section. The driving hole passes through the first shaft section and the second shaft section, and the inner circumferential surface of the large diameter section is provided with a groove 22 of the first shaft section that passes through the end face of the large diameter section away from one end of the small diameter section, and the groove passes through the end face of the second gear connected to the small diameter section to form a connecting hole 17.

[0025] The second gear is connected with an elastic member 23 and a locking block 24 that is movably connected. The elastic member is a spring sheet. One end of the elastic member is removably clamped on the end surface of the second bearing, and the other end is pressed on the side of the locking block away from the gear shaft. The inner surface of the mounting shell (specifically, the braking convex teeth are arranged on the cover plate) is provided with a plurality of braking convex teeth 25 distributed along the circumference of the gear shaft, and a braking groove 26 is formed between adjacent braking convex teeth. Specifically: a base ring 27 is arranged on the inner surface of the cover plate, and the braking convex teeth are connected to the outer circumference of the base ring. A cylindrical head 37 is arranged at one end of the locking block and is rotatably connected to a circular hole with an opening on the end surface of the second gear to achieve a movable connection with the second gear. An unlocking portion 29 is arranged at the other end of the locking block. A braking portion 30 is arranged between the cylindrical head and the unlocking portion, and a thickening block 31 is arranged on the side of the locking block away from the end surface of the second gear. A step is formed between the thickening block and the locking block to form the braking portion 30. The elastic member is used to drive the braking portion to be inserted into the braking groove to prevent the second gear from rotating. When the braking part is inserted into the braking groove for braking, the unlocking part is penetrated in the connecting hole and protrudes from the driving hole. The driving hole is a prismatic hole (specifically a regular hexagonal prism hole), and the release part is a prism with the same number of prisms as the driving hole. After the release part is inserted into the driving hole and rotated, it can drive the gear shaft to rotate. The driving hole is for the release part to be inserted to drive the unlocking part so that the braking part can be disengaged from the braking groove. When the braking part is located outside the braking groove, the elastic part is in an energy storage state. The unlocking part is provided with a guide surface 32 for contacting the release part and guiding the unlocking part to shrink toward the connecting hole. The unlocking part is provided with a guide surface 32 at both ends of the axial direction of the gear shaft. One end 33 of the guide surface is located outside the space surrounded by the wall surface of the driving hole, specifically located in the groove 22. The locking block is provided with a hook head 34 at one end of the connecting hole, and the hook head is penetrated in the part of the groove located on the second gear. The brake groove is provided with a first abutting surface 35 and a second abutting surface 36, and the first abutting surface and the second abutting surface are distributed along the circumference of the second gear. When the second gear rotates with the first abutting surface at the rear and the second abutting surface at the front until the first abutting surface abuts against the brake part, the brake part can prevent the second gear from rotating. When the second gear rotates with the first abutting surface at the front and the second abutting surface at the rear until the second abutting surface abuts against the brake part, the second abutting surface drives the brake part to escape from the brake groove. When the screw rod is in a state of extending up and down, the second gear is rotated with the first abutting surface at the rear and the second abutting surface at the front, and the direction in which the second gear drives the screw rod to rotate is such that the component when the thread is connected to the screw rod moves in the direction.

[0026] When the screw rod needs to be rotated, the release piece is inserted into the driving hole and has an unlocking part, so that the braking part is disengaged from the braking groove, the release piece is rotated to rotate the gear shaft to drive the second gear to rotate, the second gear drives the first gear to rotate, and the first gear drives the screw rod to rotate, so that the screw rod drives the component threadedly connected to the screw rod to translate along the extension direction of the screw rod. After the release piece is pulled out, when the second gear rotates to align the braking part with a prepared groove, the braking part is inserted into the prepared groove under the action of the elastic member, so that the second gear cannot rotate, which plays a role in braking the screw rod and preventing it from rotating.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A self-locking gear box structure with a reinforced braking part, characterized in that: The invention comprises a mounting shell, wherein the mounting shell is provided with a screw mounting hole, wherein a first gear and a second gear meshing with the first gear are arranged in the mounting shell, wherein the first gear is used to connect with a screw inserted in the screw mounting hole to drive the screw to rotate, wherein the second gear is connected to a gear shaft, wherein the gear shaft is rotatably connected in the mounting shell and at least one end is exposed in the mounting shell, wherein a driving hole is arranged on the end surface of the gear shaft, wherein an elastic member and a locking block are movably connected to the second gear, wherein a plurality of brake grooves distributed along the circumference of the gear shaft are arranged on the inner surface of the mounting shell, wherein the locking block is provided with a brake portion and an unlocking portion, The elastic member is used to drive the braking part to be inserted into the braking groove to prevent the second gear from rotating. The gear shaft is provided with a connecting hole connecting the outer circumferential surface of the gear shaft and the driving hole. When the braking part is inserted into the braking groove for braking, the unlocking part is penetrated in the connecting hole. The driving hole is for the insertion of the release part to drive the unlocking part so that the braking part is released from the braking groove. When the braking part is located outside the braking groove, the elastic member is in an energy storage state. A thickening block is provided on the side of the locking block away from the end face of the second gear, and a step constituting the braking part is formed between the thickening block and the locking block.

2. A self-locking gear box structure with a reinforced braking portion according to claim 1, characterized in that: The gear shaft includes a first shaft section and a second shaft section connected together at one end, and the second gear is integrally formed on the first shaft section.

3. A self-locking gear box structure with a reinforced braking portion according to claim 2, characterized in that: The second gear is a plastic part made by jet.

4. A self-locking gear box structure with a reinforced braking portion according to claim 2 or 3, characterized in that: The first shaft section is provided with a large diameter section and a small diameter section, the large diameter section is located between the small diameter section and the large diameter section, the second gear is connected between the large diameter section and the small diameter section, the drive hole passes through the first shaft section, and the inner circumferential surface of the large diameter section is provided with a groove of the first shaft section that passes through the end face of the large diameter section away from one end of the small diameter section, and the groove passes through the end face of one end of the second gear connected to the small diameter section to form the connecting hole.

5. A self-locking gear box structure with a reinforced braking portion according to claim 4, characterized in that: The locking block is provided with a hook at one end of the communicating hole, and the hook is inserted into the portion of the groove located on the second gear. The locking block is rotatably connected to the end surface of the second gear through a cylindrical head.

6. A self-locking gear box structure with a reinforced braking portion according to claim 1, 2 or 3, characterized in that: The unlocking portion is provided with a guide surface for contacting with the release member to guide the unlocking portion to shrink toward the communicating hole.

7. A self-locking gear box structure with a reinforced braking portion according to claim 6, characterized in that: The driving hole passes through the gear shaft, both ends of the gear shaft are exposed from the mounting shell, and both ends of the unlocking portion along the axial direction of the gear shaft are provided with the guide surfaces.

8. The self-locking gear box structure with a reinforced braking portion according to claim 6, characterized in that: One end of the guide surface is located outside the space surrounded by the wall surface of the driving hole.

9. A self-locking gear box structure with a reinforced braking portion according to claim 1, 2 or 3, characterized in that: The mounting shell includes a box body with a gear mounting opening and a cover plate detachably connected to the box body to cover the gear mounting opening, the cover plate is provided with an avoidance through hole for inserting a release member, a plurality of connecting pits are provided on the end surface of one end of the box body with the gear mounting opening, the cover plate is provided with connecting ears which are correspondingly inserted into the connecting pits, and the connecting ears are connected to the connecting pits through connecting bolts.

10. A self-locking gear box structure with a reinforced braking portion according to claim 1, 2 or 3, characterized in that: The driving hole is a prismatic hole, and the release member is a prismatic shape with the same number of prisms as the driving hole. After the release member is inserted into the driving hole and rotated, it can drive the gear shaft to rotate.

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