A measuring tool for measuring the gap between a rotor and a rotor housing of a rotary engine

Abstract

A measuring fixture for the clearance between the rotor and rotor housing of a rotary engine belongs to the field of rotary engine testing technology. An eccentric shaft hole is located at the center of the fixture body. Two fixture locating pin holes are located on the upper and lower sides of the eccentric shaft hole, respectively. Two clearance measuring holes are located on the left and right sides of the eccentric shaft hole, respectively. Each fixture locating pin hole has two tension bolt holes on each side. A waist-shaped groove is formed between the eccentric shaft hole and one of the fixture locating pin holes. Two rotor timing alignment points and angle plate mounting holes are located within the waist-shaped groove. A rotor timing alignment groove is formed between the two rotor timing alignment points and angle plate mounting holes. This invention, relying on a precise positioning and limiting structure and integrated design, achieves efficient and convenient detection of static and dynamic clearances while ensuring the accuracy and authenticity of clearance measurement data. It solves the problems of insufficient accuracy, low efficiency, and unreliable data in traditional measurement methods, and better meets the actual assembly and testing requirements of rotary engines.

Description

Technical Field

[0001] This invention belongs to the field of rotary engine testing technology, specifically a measuring tool for the gap between the rotor and the rotor housing of a rotary engine. Background Technology

[0002] Rotary engines, with their high power density, compact structure, and smooth operation, are widely used in special power applications, model aircraft, and small power units. The clearance between the rotor and the rotor housing is a key parameter determining the engine's airtightness, compression ratio, and service life: too small a clearance can easily lead to scraping and seizure, while too large a clearance will result in air leakage, power loss, and increased fuel consumption, directly restricting the overall performance and reliability of the engine.

[0003] However, in actual assembly and factory testing, existing technologies are insufficient to meet the requirements for accurate measurement. On the one hand, the inner cavity of the rotor engine housing is usually closed when assembled, and ordinary measuring tools cannot reach inside to directly obtain gap data. On the other hand, if the side shell of the rotor housing is directly removed, the rotor and eccentric shaft will immediately lose their limiting support, causing the components to fall apart and become inaccurate in posture, making it impossible to restore the true assembly state, and the measured data will be severely distorted.

[0004] Therefore, the industry urgently needs a special tooling that can quickly clamp and position the rotor and eccentric shaft after disassembling the side housing, prevent the parts from falling apart, and restore the engine's actual working posture, thereby achieving accurate and efficient measurement of the gap between the rotor and the housing, in order to solve the industry pain points of insufficient accuracy and unreliable data in traditional measurement methods. Summary of the Invention

[0005] To address the problems existing in the background art, the present invention provides a measuring fixture for the gap between the rotor and the rotor housing of a rotary engine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a measuring fixture for the gap between the rotor and the rotor housing of a rotary engine, comprising a fixture body; The fixture body has two fixture positioning pin holes, eight tension bolt holes, one eccentric shaft hole, two clearance measuring holes, two rotor timing alignment points and angle plate mounting holes, and one rotor timing alignment groove. The eccentric shaft hole is located at the center of the fixture body. The two fixture positioning pin holes are symmetrically arranged and located on the upper and lower sides of the eccentric shaft hole, respectively. The two clearance measuring holes are symmetrically arranged and located on the left and right sides of the eccentric shaft hole, respectively. Each fixture positioning pin hole has two tension bolt holes on each of its left and right sides. An oblong groove is formed between the eccentric shaft hole and one of the fixture positioning pin holes. Two rotor timing alignment points and angle plate mounting holes are symmetrically arranged in the oblong groove. A rotor timing alignment groove is formed between the two rotor timing alignment points and angle plate mounting holes.

[0007] Each of the aforementioned gap measuring holes is an arc-shaped hole whose inner contour matches the cycloidal contour of the rotor housing. The opening angle of each arc-shaped hole is 77° and the hole width is 6mm.

[0008] Each rotor timing alignment point and angle plate mounting hole is a threaded hole, used to engage with fastening bolts to achieve a coaxial and secure assembly of the angle plate.

[0009] Compared with the prior art, the beneficial effects of the present invention are: 1. After disassembling the side housing, use this tooling for clamping and positioning to prevent the rotor from falling apart or shifting from the eccentric shaft, restore the actual assembly posture of the engine, avoid the rotor positioning failure and measurement data distortion problems caused by traditional disassembly and assembly measurement, and ensure the authenticity and accuracy of the measurement data.

[0010] 2. By using tooling positioning pin holes, tension bolt holes, and eccentric shaft holes, multiple precise positioning and rigid constraints equivalent to the original side shell are achieved, ensuring the stability of the relative position between the rotor and the shell during the measurement process and effectively improving the measurement accuracy.

[0011] 3. When combined with a rotor timing alignment structure and an angle plate, dynamic clearance measurement can be achieved at different rotor rotation angles, and clearance data can be comprehensively acquired under the entire working trajectory of the rotor to meet dynamic detection requirements.

[0012] 4. An arc-shaped gap measuring hole with a width of 6mm is adopted to match the cycloidal contour of the rotor housing. This ensures that the upper corner seal and line seal of the rotor are limited and will not come out. It can also be directly measured with a feeler gauge, making the operation simple. The symmetrical setting of measuring holes on both sides allows for simultaneous detection, improving measurement efficiency.

[0013] 5. The fixture body is an integrated structure that integrates positioning, fixing, limiting, measurement, timing alignment, and angle plate installation functions. It has a simple structure, is easy to disassemble and assemble, and is suitable for actual on-site testing.

[0014] In summary, this invention, relying on a precise positioning and limiting structure and integrated design, achieves efficient and convenient detection of static and dynamic gaps while ensuring the accuracy and authenticity of gap measurement data. It solves the problems of insufficient accuracy, low efficiency, and unreliable data in traditional measurement methods, and is more in line with the actual assembly and testing requirements of rotary engines. Attached Figure Description

[0015] Figure 1 This is a front view of the present invention; Figure 2 yes Figure 1 Sectional view at point AA; Figure 3 This is a rear view of the present invention; Figure 4 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] This embodiment describes a measuring fixture for the clearance between the rotor and the rotor housing of a rotary engine, including a fixture body 7; The tooling body 7 has two tooling positioning pin holes 1, eight tension bolt holes 2, one eccentric shaft hole 3, two clearance measuring holes 4, two rotor timing alignment points and angle plate mounting holes 5, and one rotor timing alignment groove 6. The eccentric shaft hole 3 is located at the center of the tooling body 7. The two tooling positioning pin holes 1 are symmetrically arranged and located on the upper and lower sides of the eccentric shaft hole 3, respectively. The two clearance measuring holes 4 are symmetrically arranged and located on the left and right sides of the eccentric shaft hole 3, respectively. Each tooling positioning pin hole 1 has two tension bolt holes 2 on each of its left and right sides. An oblong groove is formed between the eccentric shaft hole 3 and one of the tooling positioning pin holes 1. Two rotor timing alignment points and angle plate mounting holes 5 are symmetrically arranged in the oblong groove. A rotor timing alignment groove 6 is formed between the two rotor timing alignment points and angle plate mounting holes 5.

[0018] Each of the aforementioned gap measuring holes 4 is an arc-shaped hole whose inner contour is adapted to the cycloidal contour of the rotor housing. The opening angle of each arc-shaped hole is 77° and the hole width is 6mm.

[0019] Each of the rotor timing alignment points and angle plate mounting holes 5 is a threaded hole, used to engage with the fastening bolts to achieve a coaxial and secure assembly of the angle plate.

[0020] The core working principle of this measuring fixture is as follows: After removing the side shell of the rotor housing, the fixture clamps, positions, and limits the rotor and eccentric shaft. Through the precise positioning and rigid fixation of the fixture body 7 with the rotor housing, and the precise limiting of the eccentric shaft, the rotor can maintain a motion posture consistent with the actual operation of the engine even after the side shell is removed. The fixture body 7 is an integrated structure adapted to the mounting surface of the rotor housing. It achieves direct measurement of the gap by relying on the arc-shaped gap measuring hole 4 adapted to the cycloidal contour of the rotor housing. Through the linkage of the rotor timing alignment groove 6 in the waist-shaped groove, the rotor timing alignment point, and the angle plate mounting hole 5 with the angle plate, the dynamic and precise measurement of the gap under different rotation angles of the rotor is achieved. The key function of the waist-shaped groove is to eliminate the obstruction of vision caused by the thickness of the tooling body, providing the operator with a transparent observation window, making it easy to clearly identify the rotor timing mark and the alignment point and alignment groove on the tooling body, ensuring the precise alignment of the initial position and the angle reference, structurally solving the problems of rotor losing its limit, attitude distortion, and inaccurate clearance data after the side shell is removed, ensuring that the measurement state is consistent with the actual working state of the rotor engine throughout the process, and ultimately achieving accurate and efficient measurement of the clearance between the rotor and the rotor housing; The specific working process is as follows: First, the rotor and eccentric shaft are fully assembled into the inner cavity of the rotor housing according to the engine assembly process. The original side shells of the rotor housing are removed. Then, the tooling body 7 is fitted against the corresponding mounting surface of the rotor housing, so that the locating pins on the rotor housing are inserted into the two tooling locating pin holes 1 on the tooling body 7, achieving precise circumferential and radial positioning of the tooling body 7 on the rotor housing and preventing the tooling body 7 from shifting. At the same time, the end of the rotor's eccentric shaft is precisely inserted into the eccentric shaft hole 3 in the center of the tooling body 7, completing the axial and radial limiting of the eccentric shaft, ensuring that the rotor can perform a cycloidal revolution and rotation compound motion around the eccentric shaft consistent with the actual working, and will not move or shift due to the loss of side shell constraint. Subsequently, bolts are inserted into the eight tension bolt holes 2 of the tooling body 7 and threadedly connected to the rotor housing. All bolts are tightened symmetrically and evenly, so that the tooling body 7 and the rotor housing fit tightly, while forming a stable clamping limit on the rotor, further limiting the rotor's displacement, and ensuring that the relative position of the rotor and the housing is always consistent with the actual working state of the engine during the measurement process.

[0021] Next, using the fixture body 7 as a reference, the eccentric shaft is slowly rotated, causing the rotor to move synchronously within the rotor housing cavity. The rotor's timing mark is precisely aligned with the rotor timing alignment slot 6, rotor timing alignment point, and angle disc mounting hole 5 on the fixture body 7, completing the precise alignment of the rotor's initial measurement position. Then, the angle disc is screwed onto the two symmetrically arranged rotor timing alignment points and angle disc mounting holes 5 on the fixture body 7 using fastening bolts. The threaded connection ensures a secure coaxial assembly between the angle disc and the fixture body 7, enabling coaxial linkage between the angle disc, the eccentric shaft, and the rotor. The zero point of the angle disc's scale is matched with the rotor's initial alignment position, achieving real-time and precise reading of the rotor's rotation angle.

[0022] Then, clearance measurement can be carried out: The operator inserts a feeler gauge through two symmetrical clearance measurement holes 4 on both sides of the eccentric shaft hole 3 on the tooling body 7, along the cycloidal contour of the rotor housing, into the mating clearance between the rotor housing and the rotor. The clearance measurement hole 4 is a 77° arc-shaped hole with a width of 6mm, which can completely cover the minimum clearance position between the rotor and the rotor housing. The operator can insert the feeler gauge point by point along the minimum clearance position and surrounding key areas, read the measured value of the feeler gauge, and record the static mating clearance data of the rotor's initial alignment position. The two symmetrical clearance measurement holes 4 can also simultaneously measure the clearance on both sides of the rotor-housing mating, improving measurement efficiency and data comprehensiveness.

[0023] Using the initial alignment position of the rotor as the angular reference, the eccentric shaft is slowly rotated, causing the rotor to perform a cycloidal motion around the eccentric shaft hole 3. The rotation angle of the rotor is read in real time through the angle dial, which is installed at the rotor alignment point and the angle dial mounting hole 5. According to the working cycloidal trajectory of the rotary engine and the requirements of clearance detection technology, the eccentric shaft is stopped at each preset angle measurement node. The rotor position is kept stable by using the fixing structure between the tooling body 7 and the rotor housing. The clearance between the rotor and the housing is measured again through the two clearance measurement holes 4 using a feeler gauge at the corresponding angle node. The data is read and recorded point by point to complete the dynamic measurement of the clearance between the rotor and the housing at different rotation angles. During the measurement process, the rotor's motion posture and the fit relationship with the housing are always consistent with the actual working state of the engine to ensure that the dynamic measurement data is accurate and reliable.

[0024] After completing the static and dynamic clearance measurements of all preset angle nodes, first remove the angle plate installed on the rotor timing alignment point and angle plate mounting hole 5. Then, symmetrically and evenly loosen the bolts in the eight tension bolt holes 2 to separate the tooling body 7 from the rotor housing, completing the tooling disassembly. At this time, the rotor housing, rotor, and eccentric shaft still maintain their original assembly state. After the measurement is completed, the original rotor housing side shell can be reinstalled to restore the engine to its normal assembly state. Finally, all static and dynamic clearance data recorded during the measurement process are organized and analyzed to determine whether the fit clearance between the rotor and the rotor housing meets the engine design and assembly technical requirements.

[0025] This fixture achieves an integrated design for positioning, limiting, and fixing after the side shell is removed through the fixture positioning pin hole 1, tension bolt hole 2, and eccentric shaft hole 3 integrated into the fixture body 7. Combined with the functional cooperation of the gap measurement hole 4, rotor timing alignment point and angle plate mounting hole 5, and rotor timing alignment slot 6, it realizes the direct measurement of the gap between the rotor engine rotor and the housing after the side shell is removed. At the same time, relying on the linkage between the rotor timing alignment slot 6, rotor timing alignment point and angle plate mounting hole 5 and the angle plate, it realizes the dynamic and accurate measurement of the gap under the preset movement angle of the rotor, effectively ensuring the authenticity and accuracy of the measurement data, and solving the problems of insufficient accuracy, low efficiency, and unreliable data of traditional measurement methods.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A measuring fixture for the clearance between the rotor and the rotor housing of a rotary engine, characterized in that: Including the tooling body (7); The tooling body (7) has two tooling positioning pin holes (1), eight tension bolt holes (2), one eccentric shaft hole (3), two clearance measuring holes (4), two rotor timing alignment points and angle plate mounting holes (5), and one rotor timing alignment groove (6). The eccentric shaft hole (3) is located at the center of the tooling body (7). The two tooling positioning pin holes (1) are symmetrically arranged and located on the upper and lower sides of the eccentric shaft hole (3). The two clearance measuring holes (4) are symmetrically arranged and located on the left and right sides of the eccentric shaft hole (3). Each tooling positioning pin hole (1) has two tension bolt holes (2) on each of its left and right sides. An oblong groove is provided between the eccentric shaft hole (3) and one of the tooling positioning pin holes (1). Two rotor timing alignment points and angle plate mounting holes (5) are symmetrically arranged in the oblong groove. A rotor timing alignment groove (6) is provided between the two rotor timing alignment points and angle plate mounting holes (5).

2. The measuring fixture for the clearance between the rotor and the rotor housing of a rotary engine according to claim 1, characterized in that: Each of the gap measuring holes (4) is an arc-shaped hole whose inner contour is adapted to the cycloidal contour of the rotor housing. The opening angle of each arc-shaped hole is 77° and the hole width is 6mm.

3. The measuring fixture for the clearance between the rotor and the rotor housing of a rotary engine according to claim 1, characterized in that: Each of the rotor timing alignment points and angle plate mounting holes (5) is a threaded hole, used to engage with the fastening bolts to achieve a coaxial and secure assembly of the angle plate.

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