Rocker arm assembly lining taking-out device

Abstract

The utility model relates to the technical field of aviation machining, and discloses a rocker arm assembly bush taking-out device which comprises a U-shaped supporting piece, a short bush pressing rod and a convex shoulder bush pressing rod, and the top and the bottom of a U-shaped groove in the U-shaped supporting piece are each provided with a U-shaped step with the outer portion higher than the inner portion; the short lining pressing rod and the convex shoulder lining pressing rod are each composed of an upper section cylinder and a lower section cylinder, and a step is formed at the joint of each upper section cylinder and the corresponding lower section cylinder. The press presses the upper section cylinder of the short lining pressing rod or the shoulder lining pressing rod downwards, and the short lining or the shoulder lining in the rocker arm fork lug can be ejected out of the corresponding lining hole downwards. The tool can be used for repairing the returned rocker arm assembly, the success rate of taking out the rocker arm assembly lining is increased, the rejection rate of the rocker arm assembly is reduced, the production cost is reduced, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation machining, and more specifically, to a device for removing bushings of a rocker arm assembly. Background Art

[0002] The rocker arm assembly is mainly applied to the aerial operation of a helicopter and is mainly used to realize the function of controlling the pitch change of the tail rotor blade. The rocker arm assembly consists of a rocker arm, a shoulder bushing, a short bushing and an anti-collision washer. The rocker arm is made of an aluminum alloy forging. The shoulder bushing and the short bushing are assembled with the rocker arm fork ear by the method of differential temperature assembly to make the holes on the two joints of the rocker arm fork ear more wear-resistant. According to the requirements of the design document, when the damage depth on the shoulder bushing and the short bushing ≥ 0.1 mm, the bushings need to be replaced. If the bushings cannot be replaced, the whole rocker arm assembly will be scrapped. The manufacturing cost of the rocker arm is high, and the scrapping will lead to low product efficiency.

[0003] Currently, the bushings of the rocker arm assembly are usually removed by the way of secondary clamping. However, the secondary clamping in milling may cause damage to the rocker arm. Moreover, there is no specific device for removing the bushings of the rocker arm assembly at present, resulting in low efficiency and low success rate of removing the bushings. Summary of the Utility Model

[0004] In view of this, the utility model provides a specific device for removing the bushings of the rocker arm assembly, which can improve the success rate of removing the bushings of the rocker arm assembly, reduce the production cost and improve the product quality.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A device for removing bushings of a rocker arm assembly includes a U-shaped support member, a short bushing pressing rod and a shoulder bushing pressing rod. The top and bottom of the U-shaped groove in the U-shaped support member are both provided with U-shaped steps with an outer height and an inner low, and the two U-shaped steps can respectively fit and support two fork ear pieces in the rocker arm fork ear. And in the supporting state, the bushing holes in the two fork ear pieces are vertically opposite to the U-shaped groove in the U-shaped support member. Both the short bushing pressing rod and the shoulder bushing pressing rod are composed of an upper section cylinder and a lower section cylinder. The diameter of the upper section cylinder is larger than that of the lower section cylinder and they are concentric. A step is formed at the connection between the upper section cylinder and the lower section cylinder. The lower section cylinder of the short bushing pressing rod can extend into the inner hole of the short bushing on the rocker arm fork ear, and at the same time, the step surface on the upper part of the lower section cylinder will abut against the annular outer end surface of the short bushing. The lower section cylinder in the shoulder bushing pressing rod can extend into the inner hole of the shoulder bushing on the rocker arm fork ear, and at the same time, the step surface on the upper part of the lower section cylinder will abut against the annular outer end surface of the shoulder bushing. When the upper section cylinder of the short bushing pressing rod or the shoulder bushing pressing rod is pressed down by a press, the short bushing or the shoulder bushing in the rocker arm fork ear can be pushed down out of the corresponding bushing hole.

[0007] Preferably, the short bushing is installed on the outer ear piece one of the rocker arm fork ear, the shoulder bushing is installed on the inner ear piece two of the rocker arm fork ear, and the shoulder part of the shoulder bushing is installed at the bushing hole on one side inside the U-shaped groove of the rocker arm fork ear.

[0008] Preferably, the length of the shoulder bushing pressing rod is determined according to the structure of the rocker arm fork ear and the press, and it is necessary to ensure that the shoulder bushing pressing rod will not interfere with the rocker arm fork ear and the press during the process of removing the bushing.

[0009] Compared with the prior art, the bushing removal device for a rocker arm assembly of the present utility model uses a press to cooperate with a U-shaped support and a corresponding short bushing pressing rod or shoulder bushing pressing rod to eject the bushing, avoiding the damage to the rocker arm caused by secondary clamping in milling processing. It can be used for the repair work of the returned rocker arm assembly, improving the success rate of removing the bushing of the rocker arm assembly, reducing the scrap rate of the rocker arm assembly, lowering the production cost, and enhancing the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0011] Figure 1 It is a schematic structural diagram of the U-shaped support in the device of the present utility model.

[0012] Figure 2 It is a schematic structural diagram of the short bushing pressing rod in the device of the present utility model.

[0013] Figure 3 It is a schematic structural diagram of the U-shaped support cooperating with the short bushing pressing rod to eject the short bushing.

[0014] Figure 4 It is a schematic structural diagram of the shoulder bushing pressing rod in the device of the present utility model.

[0015] Figure 5 It is a schematic structural diagram of the U-shaped support cooperating with the shoulder bushing pressing rod to eject the shoulder bushing.

[0016] Figure 6 It is a top view of the U-shaped support cooperating with the bushing pressing rod to eject the bushing in the rocker arm fork ear downward.

[0017] Figure 7 It is a schematic structural diagram of the rocker arm fork ear.

[0018] Figure 8 It is a schematic structural diagram of the short bushing.

[0019] Figure 9 It is a schematic structural diagram of a shoulder bushing.

[0020] In the figure: 1 - U-shaped support, 11 - U-shaped step, 2 - short bushing press rod, 3 - shoulder bushing press rod, 4 - rocker arm fork ear, 41 - first fork ear piece, 42 - second fork ear piece, 43 - bushing hole, 5 - short bushing, 6 - shoulder bushing. Specific embodiments

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element 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 invention.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0024] Embodiment:

[0025] The present invention provides a device for removing the bushing of a rocker arm assembly, mainly aiming at the rocker arm assembly in a helicopter to efficiently remove the bushing in the rocker arm assembly. Refer to Figures 1-9 This device for removing the bushing of the rocker arm assembly includes a U-shaped support 1, a short bushing press rod 2, and a shoulder bushing press rod 3.

[0026] On the top and bottom of the U-shaped groove inside the U-shaped support 1, U-shaped steps 11 with an outer height and an inner low are provided. The two U-shaped steps 11 can respectively fit and support the two fork ear pieces in the rocker arm fork ear 4, and in the supported state, the bushing holes 43 in the two fork ear pieces are vertically opposite to the U-shaped groove inside the U-shaped support 1.

[0027] The rocker arm assembly to be processed is equipped with a short bushing 5 and a shoulder bushing 6 on the fork ear part of the rocker arm assembly. Taking a specific embodiment as an example, the inner diameter of the bushing hole for installing the short bushing 5 is φ16.6 (0+0.018) mm, the corresponding outer circle of the short bushing is φ16.6 (+0.028+0.039) mm, and the interference fit between the short bushing 5 and the rocker arm fork ear is 0.01mm-0.039mm; the inner diameter of the bushing hole for installing the shoulder bushing 6 is φ13.6 (0+0.018) mm, the outer circle of the shoulder bushing is φ13.6 (+0.028+0.039) mm, and the interference fit between the shoulder bushing 6 and the rocker arm fork ear is 0.01mm-0.039mm.

[0028] The short bushing pressure rod 2 and the shoulder bushing pressure rod 3 are both composed of an upper cylinder and a lower cylinder. The diameter of the upper cylinder is larger than the diameter of the lower cylinder and is concentric with the upper cylinder, and a step is formed at the connection between the upper cylinder and the lower cylinder; the lower cylinder of the short bushing pressure rod 2 can be inserted into the inner hole of the short bushing 5 on the rocker arm fork ear 4, and the step surface on the upper part of the lower cylinder will abut against the annular outer end surface of the short bushing 5; the lower cylinder in the shoulder bushing pressure rod 3 can be inserted into the inner hole of the shoulder bushing 6 on the rocker arm fork ear 4, and the step surface on the upper part of the lower cylinder will abut against the annular outer end surface of the shoulder bushing 6.

[0029] The utility model rocker arm assembly bushing removal device is designed and manufactured according to the size of the rocker arm assembly, the short bushing 5 and the shoulder bushing 6. During operation, the rocker arm assembly fork ear part is placed on the U-shaped support 1 of the bushing removal device, the short bushing pressure rod 2 is pressed on the short bushing 5 of the rocker arm assembly, and the press machine evenly presses down the upper cylinder of the short bushing pressure rod 2 to push the short bushing 5 downward out of the bushing hole 43; then the rocker arm fork ear 4 is turned over, the shoulder bushing pressure rod 3 is pressed on the shoulder bushing 6 of the rocker arm assembly, and the press machine evenly presses down the upper cylinder of the shoulder bushing pressure rod 3 to push the shoulder bushing 6 downward out of the bushing hole 43.

[0030] In this embodiment, the short bushing 5 is installed on the outer fork ear piece 1 41 of the rocker arm fork ear 4, the shoulder bushing 6 is installed on the inner fork ear piece 2 42 of the rocker arm fork ear 4, and the shoulder part of the shoulder bushing 6 is installed at the bushing hole 43 on one side of the inner side of the U-shaped groove of the rocker arm fork ear. Therefore, the device can remove the shoulder bushing 6 from the rocker arm fork ear 4 by using the shoulder bushing pressure rod 3 to insert and support the shoulder bushing on the outer side of the rocker arm fork ear 4.

[0031] In this embodiment, the length of the shoulder bushing pressure rod 3 is determined according to the structure of the rocker arm fork ear 4 and the press, and it is necessary to ensure that the shoulder bushing pressure rod 3 does not interfere with the rocker arm fork ear 4 and the press during the withdrawal process.

[0032] After the bushing in the rocker arm assembly is removed using the bushing removal device of the present utility model, upon inspection, the anodized layers of the two bushing holes on the rocker arm fork ear are intact, and the rocker arm base is not damaged. The aperture sizes of the two bushing holes, φ16.6(0+0.018)mm and φ13.6(0+0.018)mm, are detected using a smooth plug gauge. The go gauge passes and the no-go gauge stops, indicating that the bushing hole sizes are qualified. The perpendicularity of the hole φ13.6(0+0.018)mm is detected using a vertical gauge, and the detection is qualified. The symmetry of the hole is detected using a comprehensive gauge, and the detection is qualified. Therefore, after the bushing removal work is completed using the bushing removal device of the present utility model, the sizes and position tolerances of the interference-fitted bushing holes are not affected by out-of-tolerance. Therefore, the bushing removal device of the present utility model can be used for the repair work of the returned rocker arm assembly, reducing the scrap rate of the rocker arm assembly and lowering the production cost.

[0033] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bushing removal device for a rocker arm assembly, characterized in that, It includes a U-shaped support member, a short bushing pressing rod, and a shoulder bushing pressing rod. U-shaped steps with a higher outer side and a lower inner side are provided at both the top and the bottom of the U-shaped groove inside the U-shaped support member. The two U-shaped steps can respectively fit and support two ear pieces among the rocker arm fork ears. And in the supported state, the bushing holes in the two ear pieces are vertically opposite to the U-shaped groove inside the U-shaped support member. Both the short bushing pressing rod and the shoulder bushing pressing rod are composed of an upper-section cylinder and a lower-section cylinder. The diameter of the upper-section cylinder is larger than that of the lower-section cylinder and they are concentric. A step is formed at the connection between the upper-section cylinder and the lower-section cylinder. The lower-section cylinder of the short bushing pressing rod can extend into the inner hole of the short bushing on the rocker arm fork ear, and at the same time, the step surface at the upper part of the lower-section cylinder will abut against the annular outer end surface of the short bushing. The lower-section cylinder in the shoulder bushing pressing rod can extend into the inner hole of the shoulder bushing on the rocker arm fork ear, and at the same time, the step surface at the upper part of the lower-section cylinder will abut against the annular outer end surface of the shoulder bushing. When the press machine presses down the upper-section cylinder of the short bushing pressing rod or the shoulder bushing pressing rod, the short bushing or the shoulder bushing in the rocker arm fork ear can be pushed downward out of the corresponding bushing hole.

2. The bushing removing device for a rocker arm assembly according to claim 1, characterized in that, The short bushing is installed on ear piece 1 which is located outside on the rocker arm fork ear, and the shoulder bushing is installed on ear piece 2 which is located inside on the rocker arm fork ear. And the shoulder part of the shoulder bushing is installed at the bushing hole on one side inside the U-shaped groove of the rocker arm fork ear.

3. The bushing removal device for a rocker arm assembly according to claim 2, characterized in that, The length of the shoulder bushing pressing rod is determined according to the structure of the rocker arm fork ear and the press machine, and it is necessary to ensure that the shoulder bushing pressing rod will not interfere with the rocker arm fork ear and the press machine during the bushing removal process.

Images