Hand vise for disassembling and assembling locking spring at aircraft engine valve guide pipe
Through the design of the hinged structure, the problem of unstable positioning and insufficient force application of the locking spring of the aircraft engine valve catheter in the prior art is solved, and stable positioning and efficient disassembly and assembly are achieved, avoiding valve catheter damage and operational risks.
Patent Information
- Application Number
- CN202420815464.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The locking spring disassembly and assembly clamps at the valve conduit of the existing aircraft engine have insufficient positioning stability and force application capabilities, which are prone to slip and cause disengagement, which increases the difficulty of operation and poses safety risks.
A hinge structure hand pliers are designed, which are connected through the hinge shaft of pliers one and pliers two to form a closed jaw that embraces the valve conduit. The pliers teeth match the locking spring slot to ensure that force is applied in the ring direction. It is difficult to disengage and provides stable positioning.
The stable positioning and greater force application ability of the locking spring at the valve conduit are realized during disassembly/installation, reducing the difficulty of operation, and effectively avoiding damage to the valve conduit and improving safety.
Smart Images
Figure CN222177601U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a work tool for repairing an aircraft engine, in particular to a pair of hand pliers for disassembling / installing a locking spring at a valve guide of the aircraft engine. Background Art
[0002] The engine valve guide of a small aircraft (such as Cirrus aircraft) is fixed to the engine by a special-shaped locking spring. The special-shaped locking spring is composed of two annular springs arranged axially, and each annular spring has two conical recessed grooves arranged circumferentially. The two grooves form a basically symmetrical arrangement structure in the circumferential direction, and the grooves of the two annular springs also form a basically symmetrical arrangement structure in the axial direction and are adjacent (see Figure 2 and Fig. 9 as shown).
[0003] When the valve guide of the above-mentioned aircraft engine is repaired, due to the structural particularity of the locking spring, it is necessary to use special pliers to disassemble / install it.
[0004] See also Figure 1 As shown, the hand pliers currently used for disassembling and assembling the locking spring at the valve guide of the aircraft engine have a handle A with a columnar structure, and a jaw B with a C-shaped contour structure which is integrally formed at the front end of the handle A. The occlusal side of the jaw B is protruded with two trapezoidal jaw teeth C, and the two jaw teeth C are arranged at intervals on the contour ring of the jaw B and match the groove on the locking spring.
[0005] See also Figure 2 As shown, when the above-mentioned pliers are used to remove / install the locking spring at the engine valve guide, the pliers part B is held on the valve guide beside the locking spring with the annularly open C-shaped jaws, and the two jaw teeth C on the engaging side of the pliers part B are correspondingly inserted into the two grooves of the locking spring. The pliers handle part A is rotated according to the set force direction, and the locking spring is driven to rotate around the valve guide by the concave-convex fit between the jaw teeth C and the locking spring grooves.
[0006] However, since the pliers of the above structure have a C-shaped jaw opening that is circumferentially open and surrounds the valve guide, the positioning stability on the valve guide is poor. During the process of applying a large circumferential force, the pliers cannot be reliably constrained by the circumferential limit, and the pliers are prone to slipping at the locking spring slot, causing the pliers to separate from the valve guide, increasing the technical difficulty of removing / installing the locking spring at the valve guide. In actual operation, other tools (such as wrenches, changers, etc.) are usually required to assist the pliers in applying force to the locking spring. Since other tools have poor fit with the locking spring, they are prone to slipping on the locking spring when a large force is applied, causing damage to the valve guide such as scratches or punctures, and even posing a safety risk of accidental injury to the operator.
[0007] Therefore, in view of the particularity of the locking spring at the valve guide of the above-mentioned aircraft engine, it is necessary to design a hand pliers with good fit and stable force.
[0008] The applicant has searched the prior art and has not found any effective special hand pliers technology disclosed. Utility Model Content
[0009] The technical purpose of the utility model is to provide a pair of pliers for disassembling and assembling the locking spring at the valve guide of an aircraft engine, which can form a stable constraint positioning at the valve guide and can bear a large force, in view of the particularity of the locking spring at the valve guide of the above-mentioned aircraft engine and the shortcomings of the prior art.
[0010] The technical purpose of the utility model is achieved through the following technical solutions: a pair of hand pliers for disassembling and assembling a locking spring at a valve guide of an aircraft engine, the hand pliers comprising a first pliers body and a second pliers body hinged together with a hinge axis as the center;
[0011] The pliers body has a pliers portion that forms a jaw opening and has a C-shaped outline, and the occlusal side of the pliers portion has convex pliers teeth;
[0012] The second pliers body has a second pliers portion which forms a pliers opening and has a C-shaped outline, and the occlusal side of the second pliers portion has a second pliers tooth which is convexly formed;
[0013] The first jaw of the first jaw body and the second jaw of the second jaw body, when engaged in the circumferential direction, form a jaw opening in the shape of a circular hole capable of inserting a valve guide of the aircraft engine to be repaired;
[0014] The biting side of the caliper body 1 and the biting side of the caliper body 2 are on the same side, and the caliper tooth 1 of the caliper body 1 and the caliper tooth 2 of the caliper body 2 match the circumferential groove of the locking spring connected to the valve guide in the circumferential direction of the jaws.
[0015] The pliers body 1 has a handle 1;
[0016] The handle part 1 of the pliers body 1 and the pliers part 1 of the pliers body 1 are formed in a step structure at the hinge; the occlusal sides of the pliers body 1 and the pliers body 2 hinged together by the hinge shaft are in the same plane.
[0017] The second pliers body has a second handle;
[0018] The handle part 2 of the pliers body 2 and the jaw part 2 of the pliers body 2 are formed in a step structure at the hinge; the occlusal sides of the pliers body 1 and the pliers body 2 hinged together by the hinge shaft are in the same plane.
[0019] The first jaw tooth of the first jaw body is the one farthest from the hinge axis;
[0020] The second jaw of the second jaw body is the one close to the hinge shaft;
[0021] When the jaw portion 1 of the jaw body 1 and the jaw portion 2 of the jaw body 2 are engaged in the circumferential direction to form a jaw opening, the jaw teeth 1 and the jaw teeth 2 form a symmetrical arrangement structure around the jaw opening.
[0022] The jaws of the jaw body are of a trapezoidal or triangular structure matching the outline of the slot of the locking spring.
[0023] The second jaw of the second jaw body is a trapezoidal or triangular structure matching the outline of the slot of the locking spring.
[0024] The beneficial technical effect of the utility model is as follows: the hand pliers of the utility model aim at the structural particularity of the locking spring at the valve guide of the above-mentioned aircraft engine, and form a jaw opening that can basically form a closed shape to embrace the valve guide with a pliers body one and a pliers body two that are hinged together. When the locking spring at the valve guide is disassembled / installed, the two pliers embrace the valve guide with a circular jaw opening that is basically closed in the annular direction, forming a stable positioning constraint in the annular direction of the valve guide, and can bear a large force in the annular force application process. It is not easy to slip at the locking spring slot, and is even less likely to fall off the valve guide. The positioning stability is good, which is conducive to reducing the technical difficulty of disassembling / installing the locking spring at the valve guide, and can also effectively avoid damage to the valve guide, and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The present invention is a structural schematic diagram of existing hand pliers used for disassembling and assembling locking springs at valve guides of aircraft engines.
[0026] Figure 2 for Figure 1 The reference diagram of the pliers shown is shown in the usage state.
[0027] Figure 3 It is a structural schematic diagram of the utility model.
[0028] Figure 4 for Figure 3 Side view of.
[0029] Figure 5 for Figure 3 Schematic diagram of the structure of the middle clamp body one.
[0030] Figure 6 for Figure 5 Side view of.
[0031] Figure 7 for Figure 3 Schematic diagram of the structure of the middle clamp body 2.
[0032] Figure 8 for Figure 7 Side view of.
[0033] Fig. 9 This is a reference diagram of the use status of the utility model.
[0034] The meaning of the codes in the figure are: 1—caliper body one; 11—handle one; 12—caliper part one; 13—caliper tooth one; 2—caliper body two; 21—handle two; 22—caliper part two; 23—caliper tooth two; 3—hinge shaft; 4—jaw mouth; 5—valve guide; 6—locking spring; 61—slot; A—handle; B—caliper part; C—caliper tooth. DETAILED DESCRIPTION
[0035] The utility model relates to a hand pliers tool for aircraft engine maintenance work, specifically a hand pliers for removing / installing a locking spring at a valve guide of an aircraft generator. Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 The technical solution of the utility model is clearly and in detail explained.
[0036] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention in the prior art. In addition, the expressions "approximately" and "substantially" in the following text regarding quantity or matching relationship mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantity or matching relationship.
[0037] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the utility model comprises a clamp body 1 and a clamp body 2 which are hinged together by a hinge shaft 3 to form a clamp bite structure (or a scissor-fork structure).
[0038] Specifically, the pliers body 1 has a handle 11 of a columnar structure, and a pliers 12 integrally formed at the front end of the handle 11 and having a C-shaped contour structure, and a hinge shaft hole is provided at the transition between the pliers 12 and the handle 11. The pliers 12 and the handle 11 form a step transition structure at the front side of the hinge shaft hole, that is, the C-shaped contour of the pliers 12 is protruded from one side of the handle 11. At the front end of the C-shaped pliers 12, that is, the end away from the hinge shaft hole, there is a pliers tooth 13 protruding from the occlusal side (that is, the side that fits the locking spring 6 during the disassembly and assembly operation, the same below), and the protruding contour structure of the pliers tooth 13 is a trapezoidal structure (or a nearly triangular structure) with a narrow top and a wide bottom that matches the contour of one of the slots 61 of the locking spring 6.
[0039] The pliers body 2 has a handle 21 of a columnar structure, and a pliers 22 of a C-shaped contour structure formed integrally at the front end of the handle 21. A hinge shaft hole is provided at the transition between the pliers 22 and the handle 21. The pliers 22 and the handle 21 form a step transition structure at the front side of the hinge shaft hole, that is, the part of the pliers 22 opposite to the occlusal side forms a protrusion with a C-shaped contour. At the rear end of the C-shaped pliers 22, that is, the end close to the hinge shaft hole, there is a pliers tooth 23 protruding from the occlusal side. The protruding contour structure of the pliers tooth 23 is a trapezoidal structure (or a nearly triangular structure) with a narrow top and wide bottom that matches the contour of the other slot 61 of the locking spring 6.
[0040] The caliper body 1 and the caliper body 2 of the above structure overlap axially at the hinge shaft hole to form an X-shaped scissor fit, and the hinge shaft 3 is inserted into the axially overlapping hinge shaft hole to achieve a hinged connection. In this connection structure, the caliper part 12 of the caliper body 1 is basically kept in the same plane with the occlusal side of the caliper body 2 due to the step protrusion, so as to ensure that their caliper teeth can effectively match the corresponding card groove 61 of the locking spring 6, that is, the caliper tooth 13 and the caliper tooth 23 are located on the same side; at the same time, the bottom side of the caliper part 22 of the caliper body 2 is basically kept in the same plane with the bottom side of the caliper part 12 of the caliper body 1 due to the step protrusion, so as to enhance the strength of the matching structure between them and improve the stability of positioning at the valve guide 5.
[0041] The hinged structure of the above-mentioned caliper body 1 and caliper body 2 enables the caliper portion 12 and the caliper portion 22 to be engaged in the circumferential direction to form a circular structure jaw 4 that is basically circumferentially closed and can be passed through the valve guide 5, and the caliper teeth 13 of the caliper body 1 and the caliper teeth 23 of the caliper body 2 2 basically form a symmetrical arrangement structure in the circumferential direction of the jaw 4 in the engaged state, so as to effectively match the slot 61 of the locking spring 6 connected to the valve guide 5.
[0042] The hand pliers of the above structure form a shape like a biting pliers structure, which can stably embrace the valve guide 5 during the removal / installation operation of the locking spring 6, and the hand pliers will not be separated from the valve guide 5 during the circumferential force application, thereby greatly improving or even avoiding the phenomenon of the hand pliers slipping on the locking spring 6, which is conducive to the easy and efficient removal / installation operation of the locking spring 6, and reduces or even avoids damage to the valve guide 5.
[0043] The above specific technical solutions are only used to illustrate the present invention, rather than to limit it.
[0044] Although the present invention has been described in detail with reference to the above-mentioned specific technical solutions, those skilled in the art should understand that they can still modify the specific technical solutions in the above-mentioned specific technical solutions, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the present invention.
Claims
1. A pair of hand pliers for disassembling and assembling a locking spring at a valve guide of an aircraft engine, characterized in that: The hand pliers comprises a pliers body 1 (1) and a pliers body 2 (2) which are hinged together; The clamp body (1) has a clamp portion (12) which surrounds the jaw (4) and has a C-shaped profile, and the occlusal side of the clamp portion (12) has a convexly formed clamp tooth (13); The second clamp body (2) has a second clamp portion (22) which surrounds the jaw opening (4) and has a C-shaped profile, and the occlusal side of the second clamp portion (22) has a second clamp tooth (23) which is formed in an outwardly convex manner; The first jaw portion (12) of the first jaw body (1) and the second jaw portion (22) of the second jaw body (2) form a circular hole-shaped jaw opening (4) capable of inserting a valve guide (5) of an aircraft engine to be repaired when engaged in the circumferential direction; The occlusal side of the caliper body 1 (1) and the occlusal side of the caliper body 2 (2) are on the same side, and the caliper tooth 1 (13) of the caliper body 1 (1) and the caliper tooth 2 (23) of the caliper body 2 (2) match the circumferential groove (61) of the locking spring (6) connected to the valve guide (5) in the circumferential direction of the jaw (4).
2. The hand pliers for disassembling and assembling the locking spring at the valve guide of an aircraft engine according to claim 1, characterized in that: The pliers body 1 (1) has a handle 1 (11); The handle part 1 (11) of the pliers body 1 (1) and the jaw part 1 (12) of the pliers body 1 (1) are formed in a step structure at the hinge; The occlusal sides of the hinged jaw body 1 (1) and the hinged jaw body 2 (2) are located in the same plane.
3. The pliers for disassembling and assembling the locking spring at the valve guide of an aircraft engine according to claim 1 or 2, characterized in that: The second clamp body (2) has a second handle (21); The handle part 2 (21) of the pliers body 2 (2) and the jaw part 2 (22) of the pliers body 2 (2) are formed in a step structure at the hinge.
4. The hand pliers for disassembling and assembling the locking spring at the valve guide of an aircraft engine according to claim 1, characterized in that: The jaw tooth 1 (13) of the jaw body 1 (1) is one that is far away from the reamer shaft hole; The second jaw tooth (23) of the second jaw body (2) is located close to the hinge shaft hole; When the jaw portion 1 (12) of the jaw body 1 (1) and the jaw portion 2 (22) of the jaw body 2 (2) are engaged in the circumferential direction to form a jaw opening (4), the jaw teeth 1 (13) and the jaw teeth 2 (23) form a symmetrical arrangement structure around the jaw opening (4).
5. The hand pliers for disassembling and assembling the locking spring at the valve guide of an aircraft engine according to claim 4, characterized in that: The jaw teeth 1 (13) of the jaw body 1 (1) are of a trapezoidal or triangular structure matching the profile of the slot (61) of the locking spring (6).
6. The hand pliers for disassembling and assembling the locking spring at the valve guide of an aircraft engine according to claim 4, characterized in that: The second jaw tooth (23) of the second jaw body (2) is a trapezoidal or triangular structure matching the outline of the slot (61) of the locking spring (6).