Reliable noiseless running ratchet mechanism

Abstract

A reliable noiseless running ratchet mechanism is characterized in that a pawl is connected with an arm, a ratchet is fixed on a shaft through a key and is connected with the arm, the pawl is positioned above the ratchet, a connecting rod is connected with the pawl, the contact surface of the arm, the pawl and the ratchet is provided with a stop pin, the other surface of the arm is provided with a brake wheel, and the brake wheel 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 invention relates to the technical field of mechanical design, and in particular to a reliable and noiseless ratchet mechanism. Background Art

[0002] In mechanical transmission mechanisms, ratchet motion is a typical motion mode. The driving mechanism can drive the ratchet to move. When the driving mechanism causes the ratchet to rotate an 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 will be embedded between the gears of the ratchet, which will prevent the ratchet from rotating in the opposite direction, so the ratchet will be stationary. In this way, when the driving mechanism moves, the ratchet will make unidirectional intermittent motion. However, there is a big problem with ratchet motion. When the pawl slides on the back of the ratchet teeth, the pawl will push into the ratchet teeth or jump over the ratchet teeth during the idle stroke, which will cause a "clicking" noise. Therefore, how to eliminate this noise in the ratchet motion has become an urgent problem to be solved. Summary of the invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a reliable and noiseless ratchet mechanism, which eliminates the "clicking" noise caused by the pawl pushing into the ratchet teeth during ratchet movement or jumping over the ratchet teeth during idle travel, while also reducing the wear of the pawl and the ratchet gear.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A reliable ratchet mechanism with noiseless operation comprises a pawl (4) and a ratchet wheel (7), characterized in that the pawl (4) is connected to an arm (1), the ratchet wheel (7) is fixed to a shaft (5) and connected to the arm (1) by a key, the pawl (4) is located above the ratchet wheel (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) and the pawl (4) and the ratchet wheel (7), a brake wheel (8) is provided on the other side of the arm (1), the brake wheel (8) is sleeved on the shaft (5) and rotates around the shaft (5), a brake (2) pressed by a spring is sleeved on the brake wheel (8), the stop pin (6) is located at 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).

[0005] The brake wheel (8) is rigidly connected to the arm (1) to form a whole.

[0006] The beneficial effects of the present invention are: 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

[0007] Figure 1 It is a front view schematic diagram of the present invention; Figure 2 It is a rear view schematic diagram of the present invention; Figure 3 It is a schematic diagram of the ratchet structure of the present invention.

[0008] Among them, 1 is an arm, 2 is a brake, 3 is a connecting rod, 4 is a ratchet, 5 is an axle, 6 is a stop pin, 7 is a ratchet wheel, 8 is a brake wheel, 4-1 is a rubber pad, and 4-2 is a rubber strip. DETAILED DESCRIPTION

[0009] 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.

[0010] like Figures 1 to 3 As shown in the figure, when the mechanism is in the idle stroke, the connecting rod moves to the right, driving the pawl to rotate clockwise, first lifting the pawl, so that the pawl is out of contact with the ratchet wheel. At this time, the arm will not rotate on the shaft due to the friction resistance of the brake. But when the short finger of the pawl rotates a certain angle and hits the stop pin on the arm, the connecting rod forces the arm to overcome the friction resistance of the brake and rotate around the axis. At this time, the pawl and the arm rotate on the shaft like a whole.

[0011] 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.

[0012] When the connecting rod moves to the right, the pawl rotates clockwise because it is hinged to the connecting rod, and the pawl is lifted. At this time, the pawl is out of contact with the ratchet wheel and is in an idle stroke. At this time, the brake will give the arm a friction resistance, so that the arm will not rotate on the axis. But when the short finger of the pawl rotates to a certain angle, because of the obstruction of the stop pin on the arm, the rightward movement of the connecting rod will force the arm to overcome the friction resistance of the brake and rotate around the axis. At this time, the pawl and the arm rotate on the axis like a whole.

[0013] When the connecting rod moves to the left, the pawl will rotate counterclockwise and be 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.

[0014] Because the ratchet is equipped with rubber strips and rubber pads, there will be no hard hitting sound when in contact. The rubber strip will increase a certain friction force, and there will be a certain friction feeling during the rotation process, but because it is flexible, there will be no harsh metal friction sound.

Claims

1. A reliable, noiseless ratchet mechanism, 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 between 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 sleeved on the shaft (5) and rotates around the shaft (5), a brake (2) pressed by a spring is sleeved 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, noiseless ratchet mechanism 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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