Novel overrun clutch

Abstract

The utility model discloses a novel overrun clutch which comprises a power shaft, an inner ring and an outer ring, the outer ring is installed on the power shaft, and an end plate and a shaft sleeve are arranged at the end of the power shaft. The power shaft is provided with a first shaft shoulder, the inner ring is arranged on the power shaft between the outer ring and the first shaft shoulder, the outer ring of the inner ring is provided with outer spiral teeth, the inner ring of the outer ring is provided with inner spiral teeth, and the right end of the inner ring is provided with a limiting shaft shoulder; and an energy storage spring is sleeved on the power shaft between the inner ring and the first shaft shoulder. The clutch is simple in structure and convenient to install, the inner ring and the outer ring are meshed in a spiral mode, the radial size of the clutch is reduced, large torque can be transmitted, reliability is high, and practicability is high. When the rotating speed of the outer ring is higher than that of the inner ring, the inner ring gradually rotates out of the outer ring to realize separation due to speed difference between the outer ring and the inner ring; when the rotating speed of the inner ring is larger than that of the outer ring, the inner ring is gradually screwed into the outer ring to realize connection.

Description

Technical Field

[0001] The utility model relates to a clutch, in particular to a new type of overrunning clutch. Background Art

[0002] An overrunning clutch is a clutch that can achieve automatic connection and separation. When the rotational speed of the driving shaft is greater than that of the driven shaft, the automatic connection between the driving shaft and the driven shaft is realized to achieve power transmission; when the rotational speed of the driving shaft is less than that of the driven shaft, the connection is disconnected and the power transmission is interrupted. The overrunning clutch is a commonly used basic part in the mechanical transmission system. Currently, there are mainly roller type and wedge type, etc. The roller type realizes the clutch through the rolling of the rollers in the wedge-shaped grooves, and the wedge type switches the power through the wedging and relaxation of the wedges between the inner and outer rings. The structures of these clutches are relatively complex and the radial dimensions are relatively large, which limits the installation and use in some occasions. In addition, these clutches rely on the frictional force between the rollers or wedges and the corresponding components to transmit torque, and the torque transmission capacity is relatively small. Summary of the Invention

[0003] In view of this, the utility model provides a new type of overrunning clutch, which can not only transmit a large torque, but also has a simple and compact structure, and is particularly suitable for narrow installation spaces.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] The new type of overrunning clutch of the utility model includes a power shaft, an inner ring and an outer ring. The inner ring of the outer ring is installed on the power shaft through a bearing. An end plate and a shaft sleeve for axially positioning the bearing are arranged at the end of the power shaft. The power shaft has a first shaft shoulder. The inner ring is arranged on the power shaft between the outer ring and the first shaft shoulder. The inner ring of the inner ring is slidably matched with the power shaft. The outer ring of the inner ring has an external helical tooth. The inner ring of the outer ring is provided with an internal helical tooth that is helically meshed with the external helical tooth. The right end of the inner ring has a limiting shaft shoulder. A storage spring is sleeved on the power shaft between the inner ring and the first shaft shoulder. The beneficial effects are as follows: The structure of the utility model is simple and convenient for installation. The inner ring and the outer ring of the utility model are helically meshed, which not only reduces the radial dimension of the clutch, but also can transmit a large torque, with high reliability and strong practicability.

[0006] Preferably, the inner ring of the inner ring has an internal spline, and the power shaft has an external spline that is matched with the internal spline. A part of the external spline is located inside the outer ring to ensure that the inner ring smoothly slides into the outer ring.

[0007] Preferably, the axial length of the internal helical tooth is greater than the axial length of the external helical tooth, and the axial length of the external helical tooth is the same as the length of the external spline located inside the outer ring.

[0008] More preferably, a fillet is provided between the spiral surface of the outer spiral teeth near the end face of the inner ring and the end face of the inner ring. In the present utility model, a fillet is provided between one spiral surface of each outer spiral tooth and the end face of the inner ring, reducing the frictional impact when the outer spiral groove formed by the inner spiral teeth and the outer spiral teeth comes into contact.

[0009] Compared with the prior art, the structure of the present utility model is simple and convenient for installation; the inner ring and the outer ring of the present utility model are in spiral engagement, which not only reduces the radial size of the clutch, but also can transmit a large torque, with high reliability and strong practicability. Specifically: when the rotational speed of the outer ring is higher than that of the inner ring, due to the speed difference between the two, the inner ring gradually screws out of the outer ring, thereby achieving separation; when the rotational speed of the inner ring is greater than that of the outer ring, the inner ring gradually screws into the outer ring to achieve the connection between the two, and then drives the outer ring to rotate together, and the energy storage spring helps the connection between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic cross-sectional view of the present utility model.

[0011] Figure 2 is an axonometric schematic view of the inner ring in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0013] It should be noted that in the description of the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0014] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected" and "connected" that may appear should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication between two elements inside. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0015] Such as Figure 1-2As shown in the figure, the new overrunning clutch of the present utility model includes a power shaft 1, an inner ring 2 and an outer ring 3 (the outer ring 3 has meshing teeth on its outer circumference, and power can be transmitted to the driven shaft through tooth meshing). The inner ring of the outer ring 3 is installed on the power shaft 1 through a bearing 4 to ensure the connection and separation of the power shaft 1 and the outer ring 3. A baffle 5 is fixed on the end face of the power shaft 1 by bolts, and a bushing 6 for axially positioning the inner ring of the bearing 4 is arranged inside the baffle 5.

[0016] The power shaft 1 has a first shaft shoulder 1.1, and the inner ring 2 is installed on the power shaft 1 between the outer ring 3 and the first shaft shoulder 1.1. The inner ring of the inner ring 2 is provided with an internal spline 2.1, and the power shaft 1 has an external spline 1.2 that cooperates with the internal spline 2.1. The inner ring 2 and the power shaft 1 are connected by splines to ensure that the inner ring 2 can slide along the power shaft 1 and can also ensure the synchronous rotation of the inner ring 2 and the power shaft 1. Among them, the left end of the external spline 1.2 extends to the bearing 4 inside the outer ring 3. On the one hand, it can axially position the bearing 4, and on the other hand, it enables the inner ring 2 to enter the outer ring 3 to achieve their connection.

[0017] The outer circumference of the inner ring 2 has external spiral teeth 2.2, and the outer circumference of the inner ring 2 correspondingly has a plurality of external spiral grooves. The inner circumference of the outer ring 3 is provided with internal spiral teeth that are helically meshed with the external spiral teeth 2.2, and the inner circumference of the outer ring 3 correspondingly has a plurality of internal spiral grooves 3.1. When connecting, the external spiral teeth 2.2 of the inner ring 2 enter the internal spiral grooves 3.1 of the outer ring 3, and the internal spiral teeth of the outer ring 3 are screwed into the external spiral grooves of the inner ring 2, thereby realizing their helical meshing. A energy storage spring 7 is sleeved on the power shaft 1 between the inner ring 2 and the first shaft shoulder 1.1. The energy storage spring 7 can promote the helical meshing of the inner ring 2 and the outer ring 3. When separating, the energy storage spring 7 keeps the end faces of the outer ring 3 and the inner ring 2 in contact all the time, which is beneficial to their helical meshing. Among them, the right end of the inner ring 2 has a limiting shaft shoulder 2.3. When the limiting shaft shoulder 2.3 and the end face of the outer ring 3 are closely attached together under the action of the energy storage spring 7 to form a whole of the inner ring 2 and the outer ring 3, the power shaft 1 can drive the outer ring 3 to rotate synchronously through the inner ring 2 to achieve power transmission.

[0018] During actual installation, a fillet F is designed between the helical surface of each external spiral tooth 2.2 and the end face of the inner ring 2 near the end face of the inner ring 2. When the end face of the outer ring 3 and the end face of the inner ring 2 are in contact, it can effectively reduce the friction impact between the two, thereby protecting the inner ring 2 and the outer ring 3 and extending the working life of the clutch.

[0019] During actual processing, the axial length of the internal spiral teeth is slightly greater than the axial length of the external spiral teeth 2.2, and the axial length of the external spiral teeth 2.2 is the same as the length of the external spline 1.2 located inside the outer ring 3. The helix direction of the external spiral teeth 2.2 is the same as the rotation direction of the power shaft 1 (viewed from the left side of the spring).

[0020] The working principle and operation process of the present utility model are as follows: The power shaft 1 is the driving part. The inner ring 2 is splined to the power shaft 1, so that their rotational speeds always remain the same and the inner ring 2 can axially move on the power shaft 1. The outer ring 3 is the driven part. When the rotational speed of the outer ring 3 is greater than that of the power shaft 1, the rotational speed of the outer ring 3 is correspondingly greater than that of the inner ring 2. Since there is a speed difference between the inner ring 2 and the outer ring 3 and they are helically meshed, at this time, the inner ring 2 screws out of the inner circle of the outer ring 3 along the power shaft 1. The end face of the inner helical teeth of the outer ring 3 and the end face of the outer helical groove of the inner ring 2 remain in contact under the action of the energy storage spring 7, and the fillet on the outer ring 3 is used to reduce the frictional impact when they come into contact; when the rotational speed of the power shaft 1 is greater than that of the outer ring 3, the rotational speed of the inner ring 2 is also correspondingly greater than that of the outer ring 3, so that the inner ring 2 moves inward into the outer ring 3 under the push of the energy storage spring 7 to realize the helical meshing of the inner ring 2 and the outer ring 3; when the limiting shoulder 2.3 of the inner ring 2 is in contact with the end face of the outer ring 3, they form a whole, and the power shaft 1 drives the outer ring 3 to rotate synchronously through the inner ring 2 to realize the transmission of power.

[0021] Finally, it should be emphasized that the above description is only the preferred embodiment of the present utility model and is not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or make equivalent replacements for some of the technical features. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A novel overrunning clutch, comprising a power shaft, an inner ring and an outer ring, characterized in that: The inner ring of the outer ring is installed on the power shaft through a bearing, and the end of the power shaft is provided with an end plate and a sleeve for axial positioning of the bearing; the power shaft has a first shoulder, and the inner ring is arranged on the power shaft between the outer ring and the first shoulder, the inner ring of the inner ring is slidingly matched with the power shaft, the outer ring of the inner ring has external helical teeth, and the inner ring of the outer ring is provided with internal helical teeth helically meshed with the external helical teeth, and the right end of the inner ring has a limiting shoulder; an energy storage spring is mounted on the power shaft between the inner ring and the first shoulder.

2. The novel overrunning clutch according to claim 1 is characterized in that: The inner ring has an inner spline on the inner circle, and the power shaft has an outer spline that matches the inner spline.

3. The new overrunning clutch according to claim 2 is characterized in that: The axial length of the inner helical teeth is greater than the axial length of the outer helical teeth, and the axial length of the outer helical teeth is consistent with the length of the outer spline located in the outer ring.

4. The novel overrunning clutch according to claim 1 is characterized in that: A rounded corner is provided between the helical surface of the outer helical tooth near the end surface of the inner ring and the end surface of the inner ring.

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