CN217227904U - Combined rocker arm - Google Patents

Abstract

The application provides a modular rocking arm includes: the input end of the input rocker arm is provided with a joint bearing, and the output end of the input rocker arm is connected with the shaft sleeve; the input end of the output rocker arm is connected with the shaft sleeve, the output end of the output rocker arm is provided with a left lug and a right lug which are machined into a band with sinking after being bent and formed by a metal plate, and the left lug and the right lug are symmetrically riveted to two surfaces of the output end of the output rocker arm through rivets to form an output end fork lug; the shaft sleeve comprises a body structure of a hollow shaft, an input flange and an output flange which are fixed on the hollow shaft and are separated from each other by a preset distance, and the input flange and the output flange are staggered by a preset angle in the circumferential direction, wherein an input rocker arm is sleeved on the hollow shaft and is connected with the input flange, and an output rocker arm is sleeved on the hollow shaft and is connected with the output flange; the wear-resistant sleeve is arranged in the hollow shaft and forms a rocker arm main body together with the input rocker arm, the output rocker arm and the shaft sleeve; the rotating shaft sleeve is arranged in the wear-resistant sleeve and is connected with the machine body structure through a fixed rotating shaft hinge bolt assembly to form a rotating shaft of the rocker arm main body.

Description

Combined rocker arm

Technical Field

The application belongs to the technical field of mechanical transmission, and particularly relates to a combined rocker arm.

Background

The main control system of the general light small airplane generally consists of three-shaft control subsystems of an elevator, an aileron and a rudder, generally adopts non-boosting reversible hard mechanical transmission, and generally consists of 3-5 stages of transmission components consisting of pull rods, rocker arms, supports and the like between a driver control device and each control surface to form a mechanical transmission line system for transmitting the force and displacement control instructions of the driver.

For satisfying the transmission demand of driver's power and displacement, as the rocking arm of mechanical line system drive assembly, need satisfy two aspects demands:

first, the functional requirements of the rocker arm: the rocker arm should meet the requirements of the direction of input and output motion and the transmission ratio;

secondly, the rocker arm adapts to the installation requirement on the machine: the rocker arm needs to be hinged and installed on the machine body structure, so that the rocker arm integrally rotates around the fixed rotating shaft.

The traditional solution is that a casting or machining support made of aluminum alloy is fixedly arranged on a machine body structure through flange connection, and the support is provided with a double-fork lug as a hinged mounting interface of the rocker arm on a support; the rocker arm is made of aluminum alloy, a radial ball bearing is used for a fixed rotating shaft of the rocker arm, and joint bearings are used for input and output hinged points of the rocker arm.

The above-described conventional solutions have the following problems:

firstly, the severe weight index requirements of a general light small airplane are difficult to meet, and the weight cost of a casting or a machined part support made of an aluminum alloy material is high; for the aluminum alloy integral machined rocker arm, two 1026-center ball bearings with the specification are generally used at the fixed rotating shaft part, and according to the requirement of a bearing fixing mode HB0-37, the thickness of the fixed rotating shaft part of the integral machined rocker arm cannot be smaller than 25mm generally, so that the weight of a transmission assembly is further increased;

secondly, the machining manufacturability of the whole piece support and the whole machined rocker arm is not good, resulting in high economic cost, which is expressed as:

1) if the thickness of the corresponding material of the rocker arm part is larger and exceeds the specification of the existing aluminum alloy plate or bar, the aluminum alloy bar needs to be freely forged and then machined;

2) if the shape of the rocker arm part is complex (for example, the input motion and the output motion of the rocker arm are not in the same plane, or an included angle exists between the output motion of the rocker arm and the input motion plane), the part machining process is relatively complex, the machining workload from the blank to the part is large, the economic cost is high, and the economic cost is further improved due to the low material utilization rate;

thirdly, the maintainability of the integral machined rocker arm is poor, the rotating shaft part of the rocker arm is easy to wear in use, and once the radial clearance of the rotating shaft part of the rocker arm reaches the damage tolerance, the integral rocker arm needs to be scrapped and replaced by a new part.

Disclosure of Invention

It is an object of the present application to provide a combined rocker arm to solve or mitigate at least one of the problems of the background art.

The technical scheme of the application is as follows: a combination rocker arm, comprising:

the input end of the input rocker arm is provided with a joint bearing, and the output end of the input rocker arm is connected with the shaft sleeve through an input rocker arm fastener component;

the output rocker arm is of a platy structure, the input end of the output rocker arm is connected with the shaft sleeve through an output rocker arm fastener component, the output end of the output rocker arm is provided with a left lug and a right lug which are machined to be sunken after being formed by plate bending, and the left lug and the right lug are symmetrically riveted to two sides of the output end of the output rocker arm through rivets to form an output end fork lug;

the shaft sleeve comprises a body structure of a hollow shaft, an input flange and an output flange which are fixed on the hollow shaft and are separated from each other by a preset distance, and the input flange and the output flange are staggered by a preset angle in the circumferential direction, wherein the input rocker arm is sleeved on the hollow shaft and is connected with the input flange, and the output rocker arm is sleeved on the hollow shaft and is connected with the output flange;

the wear-resistant sleeve is arranged in the hollow shaft and forms a rocker arm main body together with the input rocker arm, the output rocker arm and the shaft sleeve;

the rotating shaft sleeve is arranged in the wear-resistant sleeve and is connected with the machine body structure through a fixed rotating shaft hinge bolt assembly to form a rotating shaft of the rocker arm main body.

Furthermore, the input rocker arm and the output rocker arm are formed by machining aluminum alloy plates.

Furthermore, the outer diameter of the hollow shaft of the shaft sleeve is in clearance fit with the input rocker arm and the output rocker arm.

Furthermore, wear-resisting sleeve be even symmetrical two, and with the hole interference fit of axle sleeve.

Furthermore, the outer cylindrical surface of the wear-resistant sleeve extending into the shaft sleeve is provided with a chamfer used for installation and guidance.

Further, the wear-resistant sleeve is made of steel materials.

Furthermore, the length of the rotating shaft sleeve is larger than the preset length of the hollow shaft of the shaft sleeve, so that the phenomenon that the transmission efficiency is reduced due to larger friction resistance between the rocker arm main body and the mounting structure of the combined rocker arm caused by large contact area in the rotating process of the combined rocker arm around the rotating shaft sleeve is avoided.

Furthermore, the combined rocker arm is riveted to a machine body structural part through a support upper corner piece and a support lower corner piece with flanges to form a mounting support of the combined rocker arm, wherein the support upper corner piece and the support lower corner piece are oppositely arranged at two ends of a rotating shaft sleeve in the combined rocker arm, and shoulder bushes are arranged between the support upper corner piece and the rotating shaft sleeve and between the support lower corner piece and the rotating shaft sleeve.

Furthermore, the excircle surface of the convex shoulder bush is in interference fit with a fixed rotating shaft hinge bolt assembly of the limiting rotating shaft sleeve, the end surfaces of the two convex shoulder bushes form a notch of the mounting support, and the nominal size of the notch is consistent with the axial length of the rotating shaft sleeve of the combined rocker arm.

Furthermore, the included angle between the radius of the input rocker arm and the axis of the input pull rod connected with the input rocker arm is 90 degrees, and the included angle between the radius of the output rocker arm and the axis of the output pull rod connected with the output rocker arm is 90 degrees.

The combined rocker arm overcomes the defects that the traditional rocker arm is heavy as an integral machine and high in economic cost due to poor machining manufacturability, low material utilization rate and poor maintainability of the integral machine and machining machine, is simple in structure, easy to realize, low in production cost and low in weight cost, is matched with a pull rod, a support, a fixed rotating shaft hinged bolt assembly and the like to form a transmission assembly, meets the requirements of mechanical motion power transmission (including force and speed transmission) in different occasions, and has higher popularization value in the mechanical motion transmission field of a general light small airplane control system in the mechanical transmission industry and related industries.

Drawings

In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.

Fig. 1 is a schematic structural view of a combined rocker arm according to the present application.

FIG. 2 is a top view of the composite rocker arm of the present application.

FIG. 3 is a cross-sectional view of the composite rocker arm of the present application.

FIG. 4 is a schematic view of a modular rocker arm mounting arrangement of the present application.

FIG. 5 is an enlarged cross-sectional view of section A-A of the unitized rocker arm of the present application.

Fig. 6 is a schematic view of the connection between the combined rocker arm and the input and output tie rods according to the present application.

1-input rocker arm

2-shaft sleeve

21-input flange

22-output flange

3-output rocker arm

31-left ear piece

32-Right ear tablet

33-rivet

4-wear-resistant sleeve

5-rotating shaft sleeve

6-output rocker arm fastener assembly

7-input rocker arm fastener assembly

8-fixed rotating shaft hinge bolt assembly

9-support upper angle sheet

10-shoulder bushing

11-machine body structural part

12-rivet

13-input draw bar hinge bolt assembly

14-lower corner piece of support

15-output pull rod hinge bolt assembly

16-input rod

17-output pull rod

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

Fig. 1 to 3 are schematic structural views of a combined rocker arm provided in the present application, and the combined rocker arm mainly includes: the input rocker arm 1, the output rocker arm 3, the shaft sleeve 2, the wear-resistant sleeve 4, the rotating shaft sleeve 5, the fastening assembly and the like are matched with an input/output pull rod, a support or a support corner piece, a fixed rotating shaft hinged bolt assembly and the like to form a transmission assembly, so that the power transmission (including the transmission of force and speed) of mechanical motion is realized.

The input rocker arm 1 is of a plate-shaped structure and is machined by adopting an aluminum alloy plate with the model number of LY12-CZ and the thickness specification of 6 mm. The single face of the binding face of the input rocker arm 1 and the shaft sleeve 2 made of 6mm plates is processed to be 5mm in thickness, and the binding face of the shaft sleeve 2 and the output end close to the input rocker arm 1 are provided with 0.5mm step faces serving as machining area separating faces of the input rocker arm 1; the input end of the input rocker arm 1 is provided with a joint bearing with specification GE6S and is fixed according to a navigation mark HB 0-37; the processing end face of the input rocker arm 1 is attached to the shaft sleeve 2, and the other end face is locally reamed flat to serve as the bolt head attachment face of the 2 groups of input rocker arm fastener assemblies 7.

The output rocker arm 3 is also of a plate-shaped structure and is machined by adopting an aluminum alloy plate with the model number of LY12-CZ and the thickness specification of 6 mm. The single surface of the binding surface of the output rocker arm 3 and the shaft sleeve 2 of 6mm sheet material is processed to the thickness dimension of 5mm, and the binding surface of the shaft sleeve 2 and the input end close to the output rocker arm 3 are provided with 0.5mm step surfaces as machined separating surfaces; the output end of the output rocker arm 3 is formed by bending two plates with model number LY12-M and thickness specification of 1.5-2 mm, and then is added with a left lug 31 and a right lug 32 with sunken parts (the lug torsion angle is determined by the angle requirement of an output motion plane and the axis of a rocker arm fixed rotating shaft, the sunken height of the lug is determined by the thickness dimension of the lug ring end of the output pull rod 17), the left lug 31 and the right lug 32 are quenched again and naturally aged to the final state of the lug part, and the two lugs are symmetrically riveted to two end faces of the output rocker arm 3 through rivets 33 to serve as output end fork lugs; the non-processing end face of the output rocker arm 3 is attached to the shaft sleeve 2, and the other end face is locally reamed flat to serve as the bolt head attaching face of the 2 groups of input rocker arm fastener assemblies 6.

The shaft sleeve 2 comprises a hollow shaft and two flanges which are fixed on the hollow shaft at a certain distance, the two flanges are staggered at a certain angle in the circumferential direction, and the shaft sleeve 2 is machined by a bar machine with the model number of LY12-CZ and the corresponding diameter specification. Specifically, the shaft sleeve 2 is provided with two middle flanges, namely an input flange 21 and an output flange 22, which are butted and attached with the input rocker arm 1 and the output rocker arm 3, the input flange 21 and the output flange 22 are respectively matched with the input rocker arm 1 and the output rocker arm 3 to process two phi 5 through holes which are used as through holes for the shaft sleeve 2, the input rocker arm connecting bolt component 7 and the output rocker arm connecting bolt component 6; the diameter of the outer cylindrical surface of the shaft sleeve 2 is phi 22H9 so as to form a clearance fit of phi 22(H9/H9) when the shaft sleeve 2 is combined with the input rocker arm 1 and the output rocker arm 3, and through holes of the shaft sleeve 2 when the shaft sleeve 2 is matched with the input rocker arm 1 and the output rocker arm 3 to process two phi 5 are used as positioning references by using the outer cylindrical hole of the shaft sleeve 2 and the axis of a central hole shaft; the size of the inner hole of the shaft sleeve 2 is phi 22H8, so that the shaft sleeve 2 and the outer cylindrical surfaces of 2 wear-resistant sleeves 4 arranged in the inner hole of the shaft sleeve are in phi 22(H8/x8) interference fit; the outer cylindrical surfaces of two ends of the shaft sleeve 2 are respectively provided with 0.5 multiplied by 45 degrees chamfers as installation guide, so that the outer cylindrical surfaces phi 22H9 of the shaft sleeve 2 can smoothly enter phi 22H9 holes of the input rocker arm 1 and the output rocker arm 3.

The wear-resistant sleeve 4 is of a tubular structure and is machined by a bar machine of the type Q235(A3 steel). The wear-resistant sleeve 4 is divided into two parts, the axial length of each wear-resistant sleeve 4 is [1/2 (axial dimension of the shaft sleeve 2) - (5-10) ] mm, the axial length of an inner hole of each wear-resistant sleeve 4 is reduced by more than half compared with an integral structure, the machining process difficulty of a slender hole can be reduced, and the process difficulty of interference fit assembly between a phi 15x8 outer cylindrical surface of each wear-resistant sleeve 4 and the inner hole (H8/x8) of the shaft sleeve 2 is reduced; the size of the outer cylindrical surface of the wear-resistant sleeve 4 is phi 15x8, the wear-resistant sleeve and the inner hole of the shaft sleeve 2 are in interference fit with phi 15(H8/x8), and after the wear-resistant sleeve and the inner hole of the shaft sleeve 2 are assembled into a combined rocker arm main body in interference fit, the inner hole of the wear-resistant sleeve 4 is reamed to phi 12H 9; a0.8 multiplied by 15 degree chamfer is arranged on the outer cylindrical surface of one end, inserted into the shaft sleeve 2, of the wear-resistant sleeve 4 to be used as a mounting guide, so that the phi 15 multiplied by 8 outer cylindrical surface of the wear-resistant sleeve 4 can smoothly enter a phi 15H8 inner hole of the shaft sleeve 2.

The rotating shaft sleeve 5 is of a tubular or rod-shaped structure and adopts a bar machine processing piece with the corresponding diameter specification of LY 12-CZ. The axial length of the rotating shaft sleeve 5 is consistent with the nominal size of the support notch, and is about 0.5mm longer than the axial length of the shaft sleeve 2, theoretically, a gap of 0.25mm is reserved between the main body of the combined rocker arm and the support notch respectively, so that the problem that the transmission efficiency is reduced due to the fact that the friction resistance is larger due to the fact that the contact area of the main body of the rocker arm and the end face of the support notch is large in the rotating process of the combined rocker arm around the rotating shaft sleeve 5 is avoided; the rotating shaft sleeve 5 is arranged in the wear-resistant sleeve 4, the size of the outer cylindrical surface of the rotating shaft sleeve 5 is phi 12H9, and a phi 12(H9/H9) clearance fit is formed between the rotating shaft sleeve and the inner hole of the wear-resistant sleeve 4; the outer cylindrical surfaces of two ends of the rotating shaft sleeve 5 are provided with chamfers of 0.5 multiplied by 45 degrees as installation guide, so that the outer cylindrical surface of phi 12H9 of the rotating shaft sleeve 5 can smoothly enter the phi 12H9 inner hole of the wear-resistant sleeve 4.

The end surfaces of the input rocker arm 1 and the output rocker arm 3 are respectively attached to an input flange 21 and an output flange 22 of the shaft sleeve 2, and are fixedly connected through 2 groups of fasteners to form a rocker arm main body, inner holes of the input rocker arm 1 and the output rocker arm 3 are in clearance fit with an outer cylindrical surface of the shaft sleeve 2 with phi 22(H9/H9), and are fixedly connected through 2 groups of fasteners to form the rocker arm main body; the axial length of the rotating shaft sleeve 5 is about 0.5mm longer than that of the shaft sleeve 4; the outer cylindrical surface of the rotating shaft sleeve 5 and the inner hole of the wear-resistant sleeve 4 are in clearance fit with phi 12(H9/H9), the inner hole of the rotating shaft sleeve 5 and the outer cylindrical surface of the bolt polish rod of the fixed rotating shaft bolt assembly 8 are in clearance fit with phi 8(H7/f7), the range of a rotating pair of the combined rocker arm fixed rotating shaft is limited at the matching position of phi 12(H9/H9) and phi 8(H7/f7), and the wear-resistant part is limited on the rotating shaft sleeve 5 with lower cost due to the fact that the strength and the wear resistance of the wear-resistant sleeve made of steel and the fixed rotating shaft bolt are much higher than those of the rotating shaft sleeve made of LY12, and therefore the overall maintenance economic cost of the combined rocker arm is reduced.

Fig. 4 to 6 are schematic views showing the installation structure of the combined rocker arm of the present application on the machine body, and the installation relationship of the combined rocker arm on the machine body is as follows,

1) two groups of LY12 sheet bending parts are riveted to a machine body structural part 11 to be used as a mounting support of a combined rocker arm, wherein 2 groups of LY12-M with the thickness specification of 1.5-2 mm are machined to the sheet bending parts with 90-degree flanges, quenching and natural aging are carried out, the sheets are machined into a support upper fillet 9 and a support lower fillet 14, the support upper fillet 9 and the support lower fillet 14 are riveted and fixed on the machine body structural part 11 through respective flange parts and are oppositely mounted to form the support, two shoulder bushes 10 with the material types of QAL10-3-1.5-Y (aluminum bronze) are respectively attached to the surfaces of the support upper fillet 9 and the support lower fillet 14 in a rotating shaft bolt hole, the outer circular surface of each shoulder bush 10 is in interference fit with the rotating shaft bolt hole (H8/x8), a notch of the support is formed between the end surfaces of the two shoulder bushes, the nominal size of the notch is consistent with the axial size of a combined rocker arm rotating shaft sleeve, and the dimensional tolerance of the notch adopts

So as to ensure that the combined rocker arm can be smoothly installed into the support;

2) the input and output interfaces of the combined rocker arm are in a single-lug joint bearing or fork lug type, the installation type between the input pull rod 16 and the output pull rod 17 is a pull rod fork lug and rocker arm single-lug joint bearing type or a pull rod single-lug joint bearing and rocker arm fork lug type, so that the characteristic that a small angle (generally, the using angle is not more than 3 degrees) can be rotated between the inner ring and the outer ring of the joint bearing is utilized, and the adaptability of the transmission assembly to manufacturing and installation tolerance in installation is realized;

3) the rotating shaft sleeve 5 of the combined rocker arm is in clearance fit with a bolt polished rod part of a fixed rotating shaft bolt assembly 8 by using phi 8(H7/f7) so as to reduce the radial clearance of the transmission of the combined rocker arm;

4) the axial dimension of the rotating shaft sleeve 5 is consistent with the dimension of a notch formed by the two support corner pieces, but the axial length of the rotating shaft sleeve 5 is about 0.5mm larger than the axial dimension of the rocker arm main body, theoretically, in the working process of the transmission assembly, the unilateral clearance between the combined rocker arm main body and the support notch is 0.25-0.5 mm, the rotating process of the combined rocker arm around the rotating shaft sleeve 5 can be avoided, and the friction resistance is larger and the transmission efficiency is reduced due to the large contact area between the rocker arm main body and the end surface of the support notch.

In the preferred embodiment of the present application, in the full-stroke motion range of the combined rocker arm, the overall dimension and the motion trajectory of the combined rocker arm satisfy that the included angle between the radius of the input rocker arm 1 and the axis of the input pull rod 16 is close to 90 °, and the included angle between the radius of the output rocker arm 3 and the axis of the output pull rod 17 is close to 90 °, so as to obtain a larger effective arm length and improve the transmission efficiency of the transmission assembly.

In addition, to reduce the nonlinearity of the motion, the initial positions of the input rocker arm 1 and the output rocker arm 3 of the combined rocker arm are set at intermediate position points in the motion range.

In the combined rocker arm, a rotating pair at the position of a fixed rotating shaft replaces a traditional bearing by a sleeve in clearance fit, an installation support of the combined rocker arm adopts a LY12 sheet metal bent part riveted on a machine body structure, or directly uses a structural part with a notch, the support has a simple structure and is easy to process and install, and the weight of the installation support is reduced so that the whole weight of a transmission assembly is reduced; the second characteristic: according to the mechanical transmission requirement difference, the appearance of local adjustment axle sleeve 2 and input rocking arm 1, output rocking arm 3 can realize multiple mechanical transmission occasion, for example: the shaft sleeve 2 is adjusted to be in a single flange type, so that the transmission requirement that the input motion and the output motion are in the same plane can be realized; the axial size of the shaft sleeve 2 is locally adjusted, and the fork lug notch plane of the output rocker arm 3 is adjusted to be parallel to the end face of the input rocker arm 1, so that the transmission that the planes of input motion and output motion are parallel to each other and are spaced at a certain distance can be realized; two groups of combined rocker arms share the same fixed rotating shaft bolt component and are arranged on the same group of supports in parallel, so that two transmission rod systems can realize independent transmission.

The combined rocker arm overcomes the defects that the traditional rocker arm is heavy as an integral machine and high in economic cost due to poor machining manufacturability of the integral machine and low material utilization rate and maintenance performance, is simple in structure, easy to realize, low in production and use cost and low in weight cost, is matched with a pull rod, a support, a fixed rotating shaft hinged bolt assembly and the like to form a transmission assembly, meets the requirements of mechanical motion power transmission (including force and speed transmission) in different occasions, and has high popularization value in the mechanical motion transmission field of a general light small airplane control system in the mechanical transmission industry and related industries.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A modular rocker arm, comprising:

the input rocker arm comprises an input rocker arm (1) with a plate-shaped structure, wherein a joint bearing is installed at the input end of the input rocker arm (1), and the output end of the input rocker arm (1) is connected with a shaft sleeve (2) through an input rocker arm fastener assembly (7);

the output rocker arm (3) is of a platy structure, the input end of the output rocker arm (3) is connected with the shaft sleeve (2) through an output rocker arm fastener component (6), the output end of the output rocker arm (3) is provided with a left lug (31) and a right lug (32) which are machined to be sunken after being formed by plate bending, and the left lug (31) and the right lug (32) are symmetrically riveted to two surfaces of the output end of the output rocker arm (3) through rivets (33) to form output end fork lugs;

the shaft sleeve (2) comprises a body structure of a hollow shaft, and an input flange (21) and an output flange (22) which are fixed on the hollow shaft and are separated from each other by a preset distance, wherein the input flange (21) and the output flange (22) are staggered by a preset angle in the circumferential direction, the input rocker arm (1) is sleeved on the hollow shaft and is connected with the input flange (21), and the output rocker arm is sleeved on the hollow shaft and is connected with the output flange (22);

the wear-resistant sleeve (4) is arranged in the hollow shaft, and the wear-resistant sleeve (4), the input rocker arm (1), the output rocker arm (3) and the shaft sleeve (2) form a rocker arm main body;

the rotating shaft sleeve (5), the rotating shaft sleeve (5) is arranged in the wear-resistant sleeve (4), and is connected with the machine body structure through a fixed rotating shaft hinged bolt component (8) to form a rotating shaft of the rocker arm main body.

2. The combined rocker arm of claim 1, wherein the input rocker arm (1) and the output rocker arm (3) are machined from aluminum alloy sheet material.

3. Combined rocker arm according to claim 2, in which the sleeve (2) has a hollow shaft with an outer diameter which is a clearance fit between the input rocker arm (1) and the output rocker arm (3).

4. A combined rocker arm according to claim 1, in which the wear-resistant sleeves (4) are uniformly symmetrical and have an interference fit with the internal bore of the sleeve (2).

5. Combined rocker arm according to claim 4, in which the outer cylindrical surface of the wear sleeve (4) which projects into the bushing (2) is provided with a chamfer for mounting guidance.

6. Combined rocker arm according to claim 4 or 5, in which the wear sleeve (4) is made of steel.

7. The combined rocker arm of claim 1, wherein the length of the rotating shaft sleeve (5) is greater than the length of the hollow shaft of the shaft sleeve (2) by a predetermined dimension, so as to avoid the transmission efficiency reduction caused by large friction resistance between the rocker arm body and the mounting structure of the combined rocker arm due to large contact area during the rotation of the combined rocker arm around the rotating shaft sleeve (5).

8. The combined rocker arm of claim 1, wherein the combined rocker arm is riveted to a body structural member (11) through a support upper corner piece (9) and a support lower corner piece (14) with flanges to form a mounting support of the combined rocker arm, wherein the support upper corner piece (9) and the support lower corner piece (14) are oppositely arranged at two ends of a rotating shaft sleeve (5) in the combined rocker arm, and shoulder bushes (10) are arranged between the support upper corner piece (9) and the rotating shaft sleeve (5) and between the support lower corner piece (14) and the rotating shaft sleeve (5).

9. A modular rocker arm according to claim 8, in which the external circumferential surface of the shoulder bush (10) is in interference fit with the fixed shaft hinge bolt assembly (8) which defines the shaft sleeve (5), the end faces of the two shoulder bushes defining the mounting socket rebate, the rebate having a nominal dimension corresponding to the axial length of the shaft sleeve (5) of the modular rocker arm.

10. A combined rocker arm according to claim 8, characterised in that the radius of the input rocker arm (1) forms an angle of 90 ° with the axis of the input link (16) connecting the input rocker arm (1), and the radius of the output rocker arm (3) forms an angle of 90 ° with the axis of the output link (17) connecting the output rocker arm (3).

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