Durability running-in test tool for dustproof ring of helicopter undercarriage
By designing a durability run-in test tooling including nuts, outer cylinder test parts and inner cylinder test parts, the problems of high costs and equipment limitations in the prior art are solved, and the durability of the helicopter landing gear dust ring is efficiently evaluated on non-special equipment.
Patent Information
- Application Number
- CN202422257872.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing technology has high cost, long cycle and requires special equipment when evaluating the durability of the helicopter landing gear dust ring, which is very restrictive.
A durability run-in test tooling including nuts, outer cylinder test parts, inner cylinder test parts and bushings is designed to simulate the actual movement of the dust ring through reciprocating motion, and assemble the bushings in combination with temperature difference, simplify equipment requirements and reduce costs.
It realizes durability assessment on non-special equipment, reduces test costs, simplifies operating procedures, and improves efficiency.
Smart Images
Figure CN223166525U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the control technology of landing gear assembly test, and relates to a durability running-in test tool for a dust-proof ring of a helicopter landing gear. Background Technique
[0002] Whether the dust-proof ring can meet the use requirements is generally determined by the durability test of the landing gear. This test method has high cost, long cycle, and requires special equipment for testing, with high requirements and great limitations. Content of the Utility Model
[0003] The purpose of the utility model: to provide a durability running-in test tool for a dust-proof ring of a helicopter landing gear, which is not restricted by equipment and special supporting test pieces, and has a simple assessment method and low cost.
[0004] The technical solution of the utility model:
[0005] Provide a durability running-in test tool for a dust-proof ring of a helicopter landing gear, including: nut, outer cylinder test piece, inner cylinder test piece, bushing;
[0006] The inner cylinder test piece is sleeved inside the outer cylinder test piece. The bottom end of the outer cylinder test piece is provided with a two-stage step. A nut is installed inside the large bottom step, and a bushing is installed inside the small step. The bushing presses against the outer wall of the inner cylinder test piece to play a supporting role. An installation groove is opened on the side of the nut facing the outer wall of the inner cylinder test piece, and a test piece to be measured is installed in the installation groove. The test piece to be measured is in interference fit with the outer wall of the inner cylinder test piece; the top of the outer cylinder test piece is connected to the tester and is pulled by the tester to make reciprocating motion.
[0007] The stroke of the reciprocating motion is 240 mm, the lifting speed is 50 mm / s, and it stops for 2 - 5 minutes every 500 reciprocating motions.
[0008] The bushing is installed in the gap between the inner and outer cylinder test pieces by the way of temperature difference assembly.
[0009] The test piece to be measured is a dust-proof structure composed of an O-ring and a dust-proof ring in a new state.
[0010] A first observation port is opened at the position of the outer cylinder test piece that serves as the top of the motion formation, which is easy to observe the situation of the dust-proof ring moving to the limit position.
[0011] A second observation port is opened at the position of the lower end of the outer cylinder test piece close to the nut, which is easy to observe the situation of the dust-proof ring moving to the limit position.
[0012] Beneficial Effects:
[0013] The structure of the utility model is simple, and this set of tooling can be applied to any equipment that can achieve automatic reciprocating motion. During the durability test assessment process, it greatly reduces the manufacturing cost of test accessories, and also saves the cost of dedicated equipment investment or resource consumption. The assessment method for the durability of the dust-proof ring is simple and practical, easy to operate, and highly efficient. Brief Description of the Drawings
[0014] Figure 1 It is the assembly drawing of the durability test tooling for the dust-proof structure.
[0015] Figure 2 It is the assembly detail drawing of the durability test tooling for the dust-proof structure. Detailed Description of the Preferred Embodiment
[0016] The following further describes the present utility model in detail with reference to the drawings.
[0017] The present utility model provides a durability running-in test tooling for the dust-proof ring of a helicopter landing gear. As Figure 1-2 shown, it includes: nut 3, outer cylinder test piece 4, inner cylinder test piece 5, and bushing 6; the test piece to be measured is a dust-proof structure composed of an O-ring 1 and a new-state dust-proof ring 2.
[0018] This article provides a durability running-in test tooling applicable to the dust-proof ring of a helicopter landing gear. By mainly excerpting the typical structure of the dust-proof ring assembly, on the one hand, it plays a role in fixing the dust-proof ring, and on the other hand, it provides an interface for the equipment, connects to the main shaft of the equipment, and plays a role in transmitting force. The dust-proof ring is installed on the tooling, and the tooling is connected to the equipment interface. As the main shaft of the equipment reciprocates and extends, it drives the dust-proof ring to reciprocate and scrape, simulating the movement trajectory of the dust-proof ring. At the same time, by setting the reciprocating movement distance, movement speed, and number of times on the equipment, it simulates the actual movement parameters of the dust-proof ring.
[0019] Equipment requirements: It can achieve continuous reciprocating motion. It can set the up and down movement speed, and it is sufficient that the main shaft has a clamping and fixing interface.
[0020] Tooling requirements: It can be assembled with the main shaft interface and the interfaces match. The dimensions of the part that cooperates with the dust-proof ring can be adjusted and designed according to the shape of the dust-proof ring. There is an observation port, which is easy to observe the situation when the dust-proof ring moves to the limit position.
[0021] The assembly and use steps of the durability running-in test tooling for the dust-proof ring of a helicopter landing gear are as follows:
[0022] 1) Assemble the nut, dust-proof ring, and O-ring with the outer cylinder assembly of the tooling and the inner cylinder test piece. The external thread on the outer cylinder test piece is connected to the internal thread at the end of the press main shaft, and the inner cylinder is in contact with the press workbench surface.
[0023] 2) Reset the press. Without fixing the inner cylinder, reciprocate 2 times with a stroke of 100 mm to make the relative movement between the inner cylinder and the outer cylinder smooth. Then, use a pressing plate to compress the inner cylinder.
[0024] 3) The press reciprocates with a stroke of 240 mm and a lifting speed of 50 mm / s. Stop for 2 - 5 minutes every 500 reciprocations. Observe whether the dust-proof ring comes off during the test process. Check whether the dust-proof ring comes off after 9,600 reciprocations.
Claims
1. A durability running-in test tooling for a dust-proof ring of a helicopter landing gear, characterized in that, Including: Nut (3), outer cylinder test piece (4), inner cylinder test piece (5), bushing (6); The inner cylinder test piece is sleeved inside the outer cylinder test piece. The bottom end of the outer cylinder test piece is provided with a two-stage step. The nut (3) is installed inside the large bottom step, and the bushing (6) is installed inside the small step. The bushing (6) presses against the outer wall of the inner cylinder test piece to play a supporting role. An installation groove is opened on the side of the nut (3) facing the outer wall of the inner cylinder test piece, and the test piece to be measured is installed in the installation groove. The test piece to be measured is in interference fit with the outer wall of the inner cylinder test piece. The top of the outer cylinder test piece (4) is connected to the tester and is pulled by the tester to move reciprocally.
2. The test tooling according to claim 1, characterized in that, The reciprocating motion stroke is 240 mm, the lifting speed is 50 mm / s, and it stops for 2 - 5 minutes every 500 reciprocating motions.
3. The test tooling according to claim 1, characterized in that, The bushing is installed in the gap between the inner and outer cylinder test pieces by the temperature difference assembly method.
4. The test tooling according to claim 1, characterized in that, The test piece to be measured is a dust-proof structure composed of an O-ring (1) and a new-state dust-proof ring (2).
5. The test tooling according to claim 1, characterized in that, A first observation port is opened at the position of the outer cylinder test piece (4) that serves as the top of the movement formation, which is convenient for observing the situation where the dust-proof ring moves to the limit position.
6. The test tooling according to claim 1, wherein A second observation port is opened at the position near the nut at the lower end of the outer cylinder test piece (4), which is convenient for observing the situation where the dust-proof ring moves to the limit position.