Bidirectional arc-shaped groove type transmission overrunning clutch

Abstract

The invention provides a bidirectional arc-shaped groove type transmission overrun clutch. The bidirectional arc-shaped groove type transmission overrun clutch comprises a forward roller, a drum wheel, a center wheel, a backward roller and a baffle, the center wheel is provided with a two-way cambered surface, the two-way cambered surface comprises a forward cambered surface and a reverse cambered surface, the center wheel is installed in the drum wheel, a forward roller is installed on the forward cambered surface of the center wheel, a backward roller is installed on the reverse cambered surface of the center wheel, and the baffle is fixed to the end face of the drum wheel. A plurality of arc-shaped grooves are formed in the inner circumferential face of the drum wheel in the axial direction, and the arc-shaped grooves correspond to the forward pin rollers and the backward pin rollers. When large torque is transmitted, friction can be reduced through the ingenious mechanical principle, local overheating is avoided, and stable contact and transmission can still be kept under the action of the large torque.

Description

Technical Field

[0001] The present invention relates to the technical field of overrunning clutches, and specifically to a bidirectional arc groove type transmission overrunning clutch. Background Art

[0002] The existing overrunning clutches have low transmission efficiency. For the traditional wedge type structure, the contact surface friction loss reaches 15%-20% during high-speed operation; the torque is small, and the maximum torque density of the mainstream products on the market is only 50 Nm / kg; it slips under overload and the temperature is too high at high speeds. When the speed exceeds 5000 rpm, the working temperature rises at a rate of 8-10 °C per minute. Summary of the Invention

[0003] The purpose of the present invention is to provide a bidirectional arc groove type transmission overrunning clutch. The bidirectional arc groove shape and the shapes and sizes of the forward and backward rollers are reasonable. When transmitting large torque, through a clever mechanical principle, friction can be reduced, local overheating can be avoided, and stable contact and transmission can still be maintained under the action of large torque.

[0004] A bidirectional arc groove type transmission overrunning clutch includes a forward roller, a drum, a sun gear, a backward roller and a baffle; the sun gear has a bidirectional arc surface, the bidirectional arc surface includes a forward arc surface and a reverse arc surface, the sun gear is installed in the drum, the forward roller is installed on the forward arc surface of the sun gear, the backward roller is installed on the reverse arc surface of the sun gear, and the baffle is fixed to the end face of the drum; a plurality of arc grooves are provided on the inner peripheral surface of the drum along the axial direction, and the arc grooves correspond to the forward roller and the backward roller.

[0005] Further, the arc radius of the reverse arc surface is the same as that of the forward arc surface and is greater than the radius of the sun gear.

[0006] Further, the forward roller and the backward roller have the same shape and size.

[0007] Further, the forward arc surface and the reverse arc surface are connected by a transition surface.

[0008] Further, the baffle is fixed to the end face of the drum by countersunk head screws.

[0009] Further, when the sun gear rotates to the right, the forward roller moves along the forward arc surface of the sun gear under the action of centrifugal force, is coupled with the arc groove of the drum, realizes torque transmission, and drives the drum to rotate. When the sun gear stops rotating, the drum is still in a rotating state under the action of inertia and performs rightward overrunning; when the sun gear rotates to the left, the backward roller moves along the reverse arc surface of the sun gear, is coupled with the arc groove of the drum, and drives the drum to rotate at the same speed. When the sun gear stops rotating, the drum is still in a rotating state under the action of inertia and performs leftward overrunning.

[0010] The two-way arc groove type overrunning clutch of the present invention can achieve the rapid response of the transmission system under the conditions of high transmission speed and large torque; it can achieve forward and reverse overrunning, and there is no slippage between moving parts during overrunning, with small power loss; the ingenious design makes the transmission smooth and reliable, can reduce vibration and impact, and extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. is a schematic structural diagram of a two-way arc groove type overrunning clutch according to an embodiment of the present invention.

[0012] Figure 2 is Figure 1 a cross-sectional view of.

[0013] Figure 3 FIG. is the front view of the drum in the embodiment of the present invention.

[0014] Figure 4 is Figure 3 an enlarged view of part V in.

[0015] Figure 5 is Figure 3 a cross-sectional view of.

[0016] Figure 6 FIG. is the front view of the central wheel in the embodiment of the present invention.

[0017] Figure 7 is Figure 3 a cross-sectional view of.

[0018] The reference numerals in the drawings are described separately as follows: 1 - forward roller, 2 - drum, 3 - central wheel with a two-way arc surface, 4 - backward roller, 5 - baffle, 6 - two-way arc surface, 21 - arc groove, 61 - forward arc surface, 62 - reverse arc surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figure 1-7, an embodiment of the present invention provides a two-way arc groove type overrunning clutch, which includes a forward roller 1, a drum 2, a core wheel 3, a backward roller 4 and a baffle 5. The core wheel 3 has a two-way arc surface 6, and the two-way arc surface 6 includes a forward arc surface 61 and a reverse arc surface 62. The forward arc surface 61 and the reverse arc surface 62 are connected by a transition surface. The core wheel 3 is installed in the drum 2. The forward roller 1 is installed on the forward arc surface 61 of the core wheel 3, and the backward roller 4 is installed on the reverse arc surface 62 of the core wheel 3. The axial misalignment between the forward roller 1 and the backward roller 4 is 15°, which can avoid resonance phenomenon.

[0021] The arc radius of the reverse arc surface 62 is the same as that of the forward arc surface 61 and is greater than the radius of the core wheel 3. The forward roller 1 and the backward roller 4 have the same shape and size, so that the same overrunning effect can be achieved whether running forward or backward. As Figure 3 and Figure 4 shown, a plurality of arc grooves 21 are axially provided on the inner peripheral surface of the drum 2, and the arc grooves 21 correspond to the forward roller 1 and the backward roller 4. The baffle 5 is fixed to the end face of the drum 2 by 8 M4 countersunk head screws, and the axial clearance is controlled within 0.05 - 0.1 mm.

[0022] When the core wheel 3 rotates to the right, the forward roller 1 moves along the forward arc surface 61 of the core wheel 3 under the action of centrifugal force and is coupled with the arc groove 21 of the drum 2 to achieve torque transmission and drive the drum 2 to rotate; when the core wheel 3 stops rotating (when the input speed is lower than the output end), the drum 2 is still in a rotating state under the action of inertia and performs rightward overrunning.

[0023] When the core wheel 3 rotates to the left, the backward roller 4 moves along the reverse arc surface 62 of the core wheel 3 and is coupled with the arc groove 21 of the drum 2 to drive the drum 2 to rotate at the same speed; when the core wheel 3 stops rotating, the drum 2 is still in a rotating state under the action of inertia and performs leftward overrunning.

[0024] Since the rotational speed of the drum 2 is greater than or equal to the rotational speed of the core wheel 3, when the core wheel 3 rotates to the right, the backward roller 4 is at the lowest position from the rotation center, so it does not engage in transmission connection with the drum 2; when the core wheel 3 rotates to the left, the backward roller 4 is at the lowest position from the rotation center, so it does not engage in transmission connection with the drum 2.

[0025] The present invention discloses a two-way arc groove type overrunning clutch. Through the cooperation of a specially designed hyperbolic core wheel (3) and a multi-arc groove drum (2), the front / rear roller groups (1, 4) work in an axially separated installation ring, realizing the balanced distribution of contact stress during two-way transmission. This structure increases the rated torque to 2.3 times that of the traditional structure, and the working temperature is stable below 65℃ under the working condition of 5000 rpm, and the temperature rise is reduced by more than 40℃.

[0026] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A two-way arc groove type overrunning clutch, characterized in that: It includes a forward roller (1), a drum (2), a core wheel (3), a backward roller (4) and a baffle plate (5); the core wheel (3) has a bidirectional arc surface (6), the bidirectional arc surface (6) includes a forward arc surface (61) and a reverse arc surface (62), the core wheel (3) is installed in the drum (2), the forward roller (1) is installed on the forward arc surface (61) of the core wheel (3), the backward roller (4) is installed on the reverse arc surface (62) of the core wheel (3), and the baffle plate (5) is fixed to the end face of the drum (2); a plurality of arc grooves (21) are arranged axially on the inner peripheral surface of the drum (2), and the arc grooves (21) correspond to the forward roller (1) and the backward roller (4).

2. The bi-directional arc-groove type overrunning clutch as claimed in claim 1, wherein: The arc radius of the reverse arc surface (62) is the same as that of the forward arc surface (61) and is greater than the radius of the core wheel (3).

3. The two-way arc groove type overrunning clutch according to claim 1, characterized in that: The forward roller (1) and the backward roller (4) have the same shape and size.

4. The bidirectional arc-groove type overrunning clutch according to claim 1, wherein: The forward arc surface (61) and the reverse arc surface (62) are connected by a transition surface.

5. The bi-directional arc groove type overrunning clutch as claimed in claim 1, wherein: The baffle plate (5) is fixed to the end face of the drum (2) by countersunk head screws.

6. The bi-directional arc-groove type overrunning clutch according to claim 1, wherein: When the core wheel (3) rotates to the right, the forward roller (1) moves along the forward arc surface (61) of the core wheel (3) under the action of centrifugal force, couples with the arc groove (21) of the drum (2), realizes torque transmission, and drives the drum (2) to rotate. When the core wheel (3) stops rotating, the drum (2) is still in a rotating state under the action of inertia and performs rightward overrunning; when the core wheel (3) rotates to the left, the backward roller (4) moves along the reverse arc surface (62) of the core wheel (3), couples with the arc groove (21) of the drum (2), and drives the drum (2) to rotate at the same speed. When the core wheel (3) stops rotating, the drum (2) is still in a rotating state under the action of inertia and performs leftward overrunning.

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