Reliable noiseless running ratchet wheel structure

Abstract

A reliable noiseless running ratchet wheel structure is characterized in that a pawl is connected with an arm, a ratchet wheel is fixed on a shaft through a key and connected with the arm, the pawl is located above the ratchet wheel, a connecting rod is connected with the pawl, the contact face of the arm, the pawl and the ratchet wheel is provided with a stop pin, and the other face of the arm is provided with a brake wheel which is sleeved on the shaft and rotates around the shaft. A brake applying pressure by a spring is sleeved on the brake wheel, the stop pin is positioned in the groove of the pawl, a rubber strip is arranged at the top end of a long rod end of the pawl, and a rubber pad is arranged on one side of the long rod end of the pawl relative to the stop pin. The mechanical mechanism can effectively eliminate noise, has the advantages of being small in size, simple in structure, small in number of parts, low in cost and convenient to install and use.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical design, in particular to a reliable and noiseless operating ratchet structure. Background Art

[0002] Ratcheting is a typical form of motion in mechanical transmission mechanisms. A driving mechanism drives the ratchet to produce movement. When the driving mechanism rotates the ratchet through a certain angle in one direction, the pawl slides on the back of the ratchet teeth. When the driving mechanism rotates in the opposite direction, the pawl becomes wedged between the ratchet gears, preventing the ratchet from rotating in the opposite direction, causing the ratchet to remain stationary. Thus, when the driving mechanism moves, the ratchet performs unidirectional intermittent motion. However, ratcheting has a major problem: when the pawl slides on the back of the ratchet teeth, it can either press into the ratchet teeth or skip over them during idle travel, creating a "clicking" noise. Therefore, eliminating this noise during ratcheting has become a pressing issue. Summary of the Invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present utility model is to provide a reliable and noiseless operating ratchet structure, which eliminates the "clicking" noise caused by the pawl pressing into the ratchet teeth or skipping over the ratchet teeth during the ratchet movement or during the idle stroke, and also reduces the wear of the pawl and the ratchet gear.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A reliable, noiseless ratchet structure comprises a pawl (4) and a ratchet (7), characterized in that the pawl (4) is connected to an arm (1), the ratchet (7) is fixed to a shaft (5) and connected to the arm (1) via a key, the pawl (4) is located above the ratchet (7), a connecting rod (3) is connected to the pawl (4), a stop pin (6) is provided on the contact surface between the arm (1), the pawl (4) and the ratchet (7), a brake wheel (8) is provided on the other side of the arm (1), the brake wheel (8) is mounted on the shaft (5) and rotates around the shaft (5), a brake (2) pressed by a spring is mounted on the brake wheel (8), the stop pin (6) is located in the groove position of the pawl (4), a rubber strip (4-2) is provided at the top end of the long rod end of the pawl (4), and a rubber pad (4-1) is provided on the side of the long rod end of the pawl (4) relative to the stop pin (6).

[0006] The brake wheel (8) is rigidly connected to the arm (1) to form a whole.

[0007] The beneficial effects of the utility model are:

[0008] The mechanical mechanism can effectively eliminate noise, and has the advantages of small size, simple structure, few parts, low cost, and easy installation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a front view schematic diagram of the utility model;

[0010] Figure 2 It is a rear view schematic diagram of the utility model;

[0011] Figure 3 This is a schematic diagram of the pawl structure of the present utility model.

[0012] Among them, 1 is the arm; 2 is the brake; 3 is the connecting rod; 4 is the pawl; 5 is the shaft; 6 is the stop pin; 7 is the ratchet; 8 is the brake wheel; 4-1 is the rubber pad; 4-2 is the rubber strip. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0014] like Figures 1 to 3 As shown in the figure, during the idle stroke of this mechanism, the connecting rod moves to the right, driving the pawl to rotate clockwise, first lifting the pawl and releasing it from contact with the ratchet wheel. At this point, the arm does not rotate on the shaft due to the frictional resistance of the brake. However, when the short finger of the pawl rotates a certain angle and contacts the stop pin on the arm, the connecting rod forces the arm to overcome the frictional resistance of the brake and rotate around the shaft. The pawl and arm now rotate on the shaft as a single unit.

[0015] During the return stroke of the mechanism, the connecting rod moves to the left, driving the pawl to rotate counterclockwise, the pawl engages with the ratchet, and then the connecting rod drives the entire mechanism, including the ratchet and the shaft, to rotate an angle as a whole.

[0016] When the connecting rod moves to the right, the pawl, hinged to the connecting rod, rotates clockwise, lifting the pawl. At this point, the pawl loses contact with the ratchet wheel and enters the idle stroke. The brake provides frictional resistance to the arm, preventing it from rotating on the axis. However, when the pawl's short finger rotates further, the arm's stop pin blocks the movement of the connecting rod, forcing the arm to overcome the frictional resistance of the brake and rotate around the axis. The pawl and arm now rotate on the axis as a single unit.

[0017] When the connecting rod moves to the left, the pawl will rotate counterclockwise in the return stroke, and then the pawl will engage with the ratchet. At this time, the connecting rod will drive the entire mechanism, including the ratchet and the shaft to rotate an angle as a whole.

[0018] Because the pawl is equipped with rubber strips and rubber pads, there will be no hard collision sound when in contact. The rubber strip will increase a certain amount of friction, and there will be a certain amount of friction during the rotation process, but because it is flexible, there will be no harsh metal friction sound.

Claims

1. A reliable and noiseless ratchet structure, comprising a pawl (4) and a ratchet (7), characterized in that: The pawl (4) is connected to the arm (1), the ratchet (7) is fixed on the shaft (5) and connected to the arm (1) through a key, the pawl (4) is located above the ratchet (7), the connecting rod (3) is connected to the pawl (4), the contact surface of the arm (1) and the pawl (4) and the ratchet (7) is provided with a stop pin (6), the other side of the arm (1) is provided with a brake wheel (8), the brake wheel (8) is mounted on the shaft (5) and rotates around the shaft (5), a brake (2) pressed by a spring is mounted on the brake wheel (8), the stop pin (6) is located in the groove position of the pawl (4), the top end of the long rod of the pawl (4) is provided with a rubber strip (4-2), and the side of the long rod of the pawl (4) relative to the stop pin (6) is provided with a rubber pad (4-1).

2. A reliable and noiseless ratchet structure according to claim 1, characterized in that: The brake wheel (8) is rigidly connected to the arm (1) to form a whole.

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