CN220354428U - Helicopter tail transmission shaft rigid shaft assembly - Google Patents

Abstract

The utility model discloses a helicopter tail transmission shaft rigid shaft assembly, which comprises a front rigid shaft and a rear rigid shaft, wherein the front rigid shaft is formed by connecting two rigid shaft tubes, the rear rigid shaft is formed by connecting three rigid shaft tubes, and each rigid shaft is supported by a sealing ball bearing arranged at the convex steps of the shaft tubes, the convex steps of a mounting disc joint and the convex steps of a spline joint, and the helicopter tail transmission shaft rigid shaft assembly further comprises: the bearing support ring is arranged between the installation convex steps of the sealing ball bearing and the end face of the inner ring of the sealing ball bearing; the bearing support ring is provided with a step hole on the inner side wall matched with the installation convex step, so that the installation convex step part extends into the larger end of the step hole. The utility model provides a rigid shaft assembly of a helicopter tail transmission shaft, which is characterized in that a step hole is designed in a bearing support ring, so that the bearing support ring can partially cover an installation convex step, and an inner hole of the bearing support ring is not contacted with a rigid shaft tube even if the bearing support ring loosens, thereby effectively controlling the damage of the shaft tube.

Description

Helicopter tail transmission shaft rigid shaft assembly

Technical Field

The utility model relates to the field of equipment structural member assembly. More particularly, the present utility model relates to a helicopter tail drive shaft rigid shaft assembly.

Background

The helicopter is driven by an engine to drive a transmission part, and then the transmission part drives a rotor wing and a tail rotor to rotate to generate a pulling force so as to keep flying. The transmission part mainly comprises a main speed reducer, a middle speed reducer, a tail transmission shaft and the like. The tail transmission shaft is used for transmitting part of torque of the main speed reducer to the tail rotor through the middle speed reducer and the tail speed reducer, and consists of four movable shaft assemblies, a front rigid shaft assembly and a rear rigid shaft assembly. The front and rear rigid shaft assemblies are provided with 7 sealing ball bearings (3 front rigid shafts and 4 rear rigid shafts) in total, and bearing supporting rings are arranged between the sealing ball bearings and the interfaces of the shaft tubes.

As shown in fig. 2-3, the front rigid shaft assembly is formed by connecting two rigid shaft tubes i 1 with each other, the rear rigid shaft is formed by connecting three rigid shaft tubes ii 2 with each other, and the shaft tubes are connected by interference fit, in practical application, two taper bolts i 6, two taper bolts ii 7, two nuts i 8 and two nuts ii 9 are installed at each connection position between the rigid shaft tube and the spline joint 3, the mounting disc joint i 4, the mounting disc joint ii 5 and between the rigid shaft tubes for transmitting torque, and simultaneously the taper bolts respectively pass through taper holes on the two sections of rigid shaft tubes, so that the rigid shaft tubes are tightly connected. The rigid shaft is supported and rotated by a sealing ball bearing I10 and a sealing ball bearing II 11 which are arranged at the convex steps of the shaft tube, the convex steps of the mounting disc joint and the convex steps of the spline joint, and the outer ring of each sealing ball bearing is provided with a rubber sleeve 12.

As shown in fig. 4, the bearing support ring i 13 and the bearing support ring ii 14 are respectively installed between the installation convex step 15 of each sealing ball bearing and the end face of the inner ring of the sealing ball bearing, and are used for supporting the bearing and facilitating the disassembly of the sealing ball bearing. However, in the use process of the external field, the bearing support ring is similar to a washer-type structure in structure, so that the bearing support ring is frequently loosened, and the bearing support ring is easy to rotate along with the rotation of the tail transmission shaft after being loosened, and the rotation can cause the surface of the shaft tube to be contacted with the inner hole of the bearing support ring, so that the surface of the shaft tube is scratched by the support ring, and if the annular scratch is formed, serious hidden danger is caused to flight safety.

From the above, the existing rigid shaft assembly has defects in the design structure of the bearing support ring. After the sealing ball bearing is pressed, the bearing support ring has a constraint condition in the axial direction, but has no corresponding constraint along the radial direction of the rigid shaft, so that the bearing support ring is in a static free state in the radial direction, and if the axial pressing force is large enough, the bearing support ring cannot loosen; if the axial compression force is lost due to centripetal force caused by vibration of a helicopter tail beam, high-speed rotation or other reasons during operation, the bearing support ring loses axial constraint and is in a complete free state. At this time, the inner hole of the bearing support ring is contacted with the surface of the shaft tube and rotates along with the rotation of the tail transmission shaft, so that the shaft tube is scratched.

Disclosure of Invention

It is an object of the present utility model to address the above problems and/or disadvantages and to provide advantages which will be described below.

To achieve these objects and other advantages and in accordance with the purpose of the utility model, there is provided a helicopter tail drive shaft rigid shaft assembly comprising a front rigid shaft and a rear rigid shaft, the front rigid shaft being formed by interconnecting two rigid shaft tubes, the rear rigid shaft being formed by interconnecting three rigid shaft tubes, each rigid shaft being supported by a seal ball bearing mounted in the shaft tube boss, the mounting plate joint boss, and the spline joint boss, further comprising: the bearing support ring is arranged between the installation convex steps of the sealing ball bearing and the end face of the inner ring of the sealing ball bearing;

the bearing support ring is provided with a step hole on the inner side wall matched with the installation convex step, so that the installation convex step part extends into the larger end of the step hole.

Preferably, the inner diameter of the larger end of the stepped hole is configured to be larger than the outer diameter of the mounting boss, and the fit clearance thereof is controlled to be 0.05-0.1 mm.

Preferably, the thickness of the bearing support ring is 5.5-6 mm.

The utility model at least comprises the following beneficial effects: according to the utility model, the stepped holes are designed in the bearing support ring, so that the bearing support ring can partially cover the installation convex steps, and even if the bearing support ring is loosened, the inner hole of the bearing support ring cannot contact with the rigid shaft tube, and the damage of the shaft tube is effectively controlled.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.

Drawings

FIG. 1 is a schematic view of a bearing race in cooperation with a rigid shaft mounting step in a helicopter tail drive shaft rigid shaft assembly of the present utility model;

FIG. 2 is a schematic view of a prior art front rigid axle assembly;

FIG. 3 is a schematic view of a rear rigid axle assembly of the prior art;

fig. 4 is a schematic view of a prior art bearing race mated with a rigid shaft mounting step.

Detailed Description

The present utility model is described in further detail below with reference to the drawings to enable those skilled in the art to practice the utility model by referring to the description.

It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It should be noted that, in the description of the present utility model, the orientation or positional relationship indicated by the term is based on the orientation or positional relationship shown in the drawings, which are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "I", "II" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, may be a detachable connection, or may be integrally connected, may be mechanically connected, may be electrically connected, may be directly connected, may be indirectly connected through an intermediate medium, may be communication between two members, and may be understood in a specific manner by those skilled in the art.

Furthermore, in the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first and second features, or an indirect contact of the first and second features through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

The utility model aims to solve the problem of scratch of a shaft tube of a rigid shaft assembly of a tail transmission shaft of a helicopter in the prior art.

Example 1

A rigid shaft assembly of a helicopter tail transmission shaft comprises a front rigid shaft and a rear rigid shaft, wherein the front rigid shaft is formed by connecting two rigid shaft tubes with each other, the rear rigid shaft is formed by connecting three rigid shaft tubes with each other, two conical bolts and nuts are arranged at each connecting position between the rigid shaft tubes and a spline joint and between mounting disc joints and between the rigid shaft tubes, the rigid shafts are supported by sealing ball bearings arranged at the convex steps of the shaft tubes, the convex steps of the mounting disc joints and the convex steps of the spline joints, and rubber sleeves are arranged on outer rings of the sealing ball bearings.

As shown in fig. 1, further includes:

and a bearing support ring 18 mounted between the mounting step 17 of each seal ball bearing 16 and the inner ring end surface of the seal ball bearing. The step hole 19 is designed at the joint of the bearing support ring and the installation convex steps, so that the bearing support ring has constraint conditions in the radial direction, and even if the bearing support ring loosens along the axial direction, the inner hole of the bearing support ring cannot contact with the rigid shaft tube due to the existence of the step hole, so that damage is caused.

According to the scheme, the bearing support ring is improved, so that the problem of scratch of the rigid shaft tube caused by looseness of the bearing support ring is effectively prevented, the potential safety hazard of flying is eliminated, and the survivability of the helicopter is further guaranteed.

Example 2

Embodiment 2, which is a preferred example of the present utility model, discloses the following modifications on the basis of embodiment 1:

the diameter of the step hole is(phi B is the convex step size), and meanwhile, in order to ensure the depth of the step hole, the thickness S of the bearing support ring is as follows: (5.5-6) mm, which is increased by (1.5-2) mm based on the prior art, without other equipmentThe influence is caused, and the structural stability can be ensured.

This scheme is through the step hole design of great scale (make it have certain activity allowance), even if the bearing ring takes place not hard up, its hole also can not take place to contact with the rigidity central siphon, leads to the central siphon damage, further through thickness design for its inside has the step hole, and its structural stability also can not receive the restriction, can not influence life.

The above embodiments are merely illustrative of a preferred embodiment, but are not limited thereto. In practicing the present utility model, appropriate substitutions and/or modifications may be made according to the needs of the user.

The number of equipment and the scale of processing described herein are intended to simplify the description of the present utility model. Applications, modifications and variations of the present utility model will be readily apparent to those skilled in the art.

Although embodiments of the utility model have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present utility model. Additional modifications will readily occur to those skilled in the art. Therefore, the utility model is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (3)

1. The utility model provides a helicopter tail transmission shaft rigid shaft subassembly, includes two sets of rigid axles in front and back, and preceding rigid axle is formed by two rigid shaft tube interconnect, and back rigid axle is formed by three rigid shaft tube interconnect, and each rigid axle all supports through installing the sealed ball bearing in central siphon protruding order, mounting disc joint protruding order, spline joint protruding order position, its characterized in that still includes: the bearing support ring is arranged between the installation convex steps of the sealing ball bearing and the end face of the inner ring of the sealing ball bearing;

the bearing support ring is provided with a step hole on the inner side wall matched with the installation convex step, so that the installation convex step part extends into the larger end of the step hole.

2. The helicopter tail drive shaft rigid shaft assembly of claim 1 wherein the larger end inner diameter of the stepped bore is configured to be larger than the outer diameter of the mounting boss and the mating clearance is controlled to be between 0.05 and 0.1mm.

3. The helicopter tail drive shaft rigid shaft assembly of claim 1 wherein said bearing race is 5.5-6 mm thick.