CN109724796A - The continuously adjustable spiral bevel gear Power close pilot system of apex to crown - Google Patents

The continuously adjustable spiral bevel gear Power close pilot system of apex to crown Download PDF

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Publication number
CN109724796A
CN109724796A CN201811509498.9A CN201811509498A CN109724796A CN 109724796 A CN109724796 A CN 109724796A CN 201811509498 A CN201811509498 A CN 201811509498A CN 109724796 A CN109724796 A CN 109724796A
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CN
China
Prior art keywords
gear
box
spiral bevel
bevel gear
apex
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811509498.9A
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Chinese (zh)
Inventor
王成
吕庆军
邹天刚
张祖智
赵腊月
桂鹏
钟薇
侯威
孙雪岩
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China North Vehicle Research Institute
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China North Vehicle Research Institute
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Publication date
Application filed by China North Vehicle Research Institute filed Critical China North Vehicle Research Institute
Priority to CN201811509498.9A priority Critical patent/CN109724796A/en
Publication of CN109724796A publication Critical patent/CN109724796A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to gear transmission technology fields, and in particular to a kind of spiral bevel gear Power close pilot system that apex to crown is continuously adjustable.Comprising: variable-frequency motor, servo motor, torque loading device, speed reducer, main examination gear-box, accompany examination gear-box, torque sensor, closed gear case, flywheel casing, clutch and shaft coupling.The pilot system uses Power close form, main examination gear-box and accompany examination gear-box arrange in pairs, low speed quasi-static test and high speed dynamic test can be carried out, the present invention has widened the function and the scope of application of Power close formula spiral bevel gear pilot system, it can be for spiral bevel gear to dynamic tests such as low speed quasi-static test and vibration detection, boundary temperature such as development transmission error, contact patches using the pilot system, it is suitable for the test demand of spiral bevel gear pair under different apex to crowns, wide adaptation range, and effectively reduce replacement, assembly and debug time and cost.

Description

The continuously adjustable spiral bevel gear Power close pilot system of apex to crown
Technical field
The invention belongs to gear transmission technology fields, and in particular to a kind of spiral bevel gear power that apex to crown is continuously adjustable Blocking test system.
Background technique
Spiral bevel gear has the characteristics that small impact, low noise, bearing capacity height and stable drive, is widely used in high speed In heavy-duty drive system, the experimental study for carrying out spiral bevel gear can provide basic data for design, processing and assembly, improve arc The designing quality of bevel gear.Spiral bevel gear testing stand is different according to the mode that energy converts, and can be divided into the examination of Power close formula It tests platform and opens power streaming testing stand, Power close formula testing stand simple, small investment, less cost of power with structure, Revolving speed and torque are two independent control parameters, are used widely in spiral bevel gear experimental study.
Experimental study for spiral bevel gear includes two aspects of low speed quasi-static test and dynamic test, wherein low Fast quasi-static test mainly for Static transmissions error and contact patch etc. carry out testing research, high speed dynamic test mainly for Dynamic transmission error, vibration signal and boundary temperature etc. carry out testing research.Existing spiral bevel gear pilot system mainly for High speed dynamic test conducts a research, it is difficult to take into account quasi-static and two kinds of different types of dynamic test at a high speed the demand of low speed.In addition, Main examination gear-box in existing spiral bevel gear pilot system/accompany examination gear box structure and support complicated, adapts to different apex to crowns The range of lower spiral bevel gear test is small, and replaces, time length, the low efficiency of assembly and debugging, and be not easy to maintenance.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is how to provide a kind of spiral bevel gear power envelope that apex to crown is continuously adjustable Close pilot system, it is desirable that its function and the scope of application that can widen Power close formula spiral bevel gear pilot system, to realize For spiral bevel gear to low speed quasi-static test and vibration detections, boundary temperature such as development Static transmissions error, contact patches Etc. dynamic tests, and, it is desirable that it meets under a wide range of apex to crown the needs of spiral bevel gear is tested, and effectively reduce replacement, The time and cost of assembly and debugging.
(2) technical solution
In order to solve the above technical problems, the present invention provides a kind of spiral bevel gear Power close examination that apex to crown is continuously adjustable Check system, the system comprises: variable-frequency motor 1, torque loading device 5, main examination gear-box 7, accompanies examination gear at closed gear case 3 Case 9, torque sensor 11, flywheel casing 12, clutch 14, speed reducer 15 and servo motor 16;
Wherein, the variable-frequency motor 1 and torque loading device 5 are coaxially arranged;
The variable-frequency motor 1 and 3 rightmost side gear axis connection of closed gear case, 3 rightmost side gear shaft of closed gear case with Torque loading device 5 connects, and torque loading device 5 is connect with main examination gear-box 7;
Main examination gear-box 7 is arranged in pairs with examination gear-box 8 is accompanied, and main examination gear-box 7 is connect with examination gear-box 8 is accompanied;
It accompanies examination gear-box 9 to connect with flywheel casing 12, and accompanies and torque sensor is installed between examination gear-box 9 and flywheel casing 12 11;
Flywheel casing 12 and 3 leftmost side gear axis connection of closed gear case, 3 leftmost side gear shaft of closed gear case and clutch Structure 14, speed reducer 15 and servo motor 16 are coaxially arranged;
Servo motor 16 is connect with speed reducer 15, and speed reducer 15 passes through clutch 14 and 3 leftmost side tooth of closed gear case Take turns axis connection.
Wherein, the variable-frequency motor 1 and servo motor 16 are arranged in parallel, and variable-frequency motor 1 and servo motor 16 respectively with 3 two sides gear axis connection of closed gear case;
In low speed quasi-static test, clutch 14 is in bonding state, by servo motor 16, speed reducer 15 and torque 5 drive load of loader, for carrying out the slow-speed test including contact patch, Static transmissions error;
In high speed dynamic test, clutch 14 is in discrete state, is driven by variable-frequency motor 1 and torque loading device 5 Dynamic load, for carrying out the high-speed test (HST) including dynamic transmission error, vibration signal and boundary temperature.
Wherein, the master accompanies examination gear-box 7 and accompanies in examination gear-box 9, spiral bevel gear, transmission shaft, bearing and bearing block Using integrated design, spiral bevel gear and transmission shaft are connected by hydraulic expansion mode, and cantilever support main examination gear-box/ On the cabinet for accompanying examination gear-box, for adapting to the test demand of spiral bevel gear pair under different apex to crowns.
Wherein, the system also includes first shaft couplings 2;
The variable-frequency motor 1 passes through first shaft coupling 2 and 3 rightmost side gear axis connection of closed gear case.
Wherein, the system also includes second shaft couplings 4;
3 rightmost side gear shaft of closed gear case is connect by second shaft coupling 4 with torque loading device 5.
Wherein, the system also includes third shaft couplings 6;
The torque loading device 5 is connect by third shaft coupling 6 with main examination gear-box 7.
Wherein, the system also includes the 4th shaft couplings 8;
The main examination gear-box 7 and accompany examination gear-box 8 between by the 4th shaft coupling 8 connect.
Wherein, the system also includes the 5th shaft couplings 10;
It is described that examination gear-box 9 is accompanied to connect by the 5th shaft coupling 10 with flywheel casing 12, the 5th shaft coupling 10 and flywheel casing 12 Between install torque sensor 11.
Wherein, the system also includes the 6th shaft couplings 13;
The flywheel casing 12 passes through the 6th shaft coupling 13 and 3 leftmost side gear axis connection of closed gear case.
(3) beneficial effect
Compared with prior art, the present invention have it is following the utility model has the advantages that
(1) present invention is arranged in parallel by using variable-frequency motor and servo motor, variable-frequency motor and servo motor respectively with Closed gear case two sides gear axis connection, clutch is in bonding state when low speed quasi-static test, by servo motor, slows down Machine and torque loader drive load, when high speed dynamic test, clutch is in discrete state, is added by variable-frequency motor and torque It carries and sets drive load.
(2) present invention is main accompanies examination gear-box and spiral bevel gear, transmission shaft, bearing and bearing block etc. in examination gear-box is accompanied to adopt With integrated design, and spiral bevel gear and transmission shaft are connected by hydraulic expansion mode, and cantilever support main examination gear-box/ On the cabinet for accompanying examination gear-box, the apex to crown for meeting the spiral bevel gear pair in main examination gear-box/accompany examination gear-box is continuously adjustable, It is suitable for the test demand of spiral bevel gear pair under different apex to crowns, effectively reduces replacement, assembly and debug time, adaptation range Extensively.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of technical solution of the present invention.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to of the invention Specific embodiment is described in further detail.
To solve prior art problem, the present invention provides a kind of spiral bevel gear Power close examination that apex to crown is continuously adjustable Check system, as shown in Figure 1, including variable-frequency motor 1, first shaft coupling 2, closed gear case 3, second shaft coupling 4, torque load dress It sets 5, third shaft coupling 6, main examination gear-box 7, the 4th shaft coupling 8, accompany examination gear-box 9, the 5th shaft coupling 10, torque sensor 11, flywheel casing 12, the 6th shaft coupling 13, clutch 14, speed reducer 15 and servo motor 16.Variable-frequency motor 1 and torque load Device 5 is coaxially arranged, and variable-frequency motor 1 passes through first shaft coupling 2 and 3 rightmost side gear axis connection of closed gear case, closed gear Case 3 is connect by second shaft coupling 4 with torque loading device 5, and torque loading device 5 passes through third shaft coupling 6 and main examination gear Case 7 connects, and main examination gear-box 7 is arranged in pairs with examination gear-box 8 is accompanied, and main examination gear-box 7 and accompanies and tries to pass through the 4th between gear-box 8 Shaft coupling 8 connects, and examination gear-box 9 is accompanied to be connect with flywheel casing 12 by five shaft couplings 10, the 5th shaft coupling 10 and flywheel casing 12 it Between torque sensor 11 is installed, flywheel casing 12 passes through the 6th shaft coupling 13 and 3 leftmost side gear axis connection of closed gear case, closing 3 leftmost side gear shaft of gear-box and clutch 14, speed reducer 15 and servo motor 16 are coaxially arranged, servo motor 16 and deceleration Machine 15 connects, and speed reducer 15 passes through clutch 14 and 3 leftmost side gear axis connection of closed gear case.
As shown in Figure 1, being arranged in parallel using variable-frequency motor 1 and servo motor 16, variable-frequency motor 1 and servo motor 16 are distinguished With 3 two sides gear axis connection of closed gear case, clutch 14 is in bonding state when low speed quasi-static test, by servo motor 16,5 drive load of speed reducer 15 and torque loader, can carry out the slow-speed tests such as contact patch, Static transmissions error, Gao Sudong When state is tested, clutch 14 is in discrete state, by 5 drive load of variable-frequency motor 1 and torque loading device, can carry out dynamic The high-speed test (HST)s such as transmission error, vibration signal and boundary temperature.
Wherein, main to accompany examination gear-box 7 and spiral bevel gear, transmission shaft, bearing and bearing block etc. in examination gear-box 9 is accompanied to use Integrated design, spiral bevel gear and transmission shaft are connected by hydraulic expansion mode, and cantilever support is in master/accompany examination gear-box On cabinet, it is suitable for the test demand of spiral bevel gear pair under different apex to crowns, wide adaptation range can effectively reduce replacement, dress With with debug time and cost.
To sum up, pilot system provided by the present invention use Power close form, main examination gear-box and accompany try gear-box at To arrangement, low speed quasi-static test and high speed dynamic test can be carried out, wherein low speed quasi-static test is combined by clutch Servo motor and speed reducer, by servomotor, gear reducer and torque loader drive load, high speed dynamic test passes through clutch Structure disconnects servo motor and speed reducer, and by variable-frequency motor and torque loader drive load.Main examination gear-box/accompany examination gear-box Using integrated design, spiral bevel gear and transmission shaft are connected by hydraulic expansion mode, and cantilever support main examination gear-box/ On the cabinet for accompanying examination gear-box, the apex to crown for meeting the spiral bevel gear pair in main examination gear-box/accompany examination gear-box is continuously adjustable, It is suitable for the test demand of spiral bevel gear pair under different apex to crowns.The present invention has widened the test of Power close formula spiral bevel gear The function and the scope of application of system, can be for spiral bevel gear to development transmission error, contact patch etc. using the pilot system The dynamic tests such as low speed quasi-static test and vibration detection, boundary temperature are suitable for spiral bevel gear pair under different apex to crowns Test demand, wide adaptation range, and effectively reduce replacement, assembly and debug time and cost.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations Also it should be regarded as protection scope of the present invention.

Claims (9)

1. a kind of continuously adjustable spiral bevel gear Power close pilot system of apex to crown, which is characterized in that the system comprises: Variable-frequency motor (1), torque loading device (5), main examination gear-box (7), accompanies examination gear-box (9), torque to pass at closed gear case (3) Sensor (11), flywheel casing (12), clutch (14), speed reducer (15) and servo motor (16);
Wherein, the variable-frequency motor (1) and torque loading device (5) are coaxially arranged;
The variable-frequency motor (1) and closed gear case (3) rightmost side gear axis connection, closed gear case (3) rightmost side gear shaft It is connect with torque loading device (5), torque loading device (5) is connect with main examination gear-box (7);
Main examination gear-box (7) is arranged in pairs with examination gear-box (8) is accompanied, and main examination gear-box (7) connect with examination gear-box (8) is accompanied;
It accompanies examination gear-box (9) to connect with flywheel casing (12), and accompanies and torque sensing is installed between examination gear-box (9) and flywheel casing (12) Device (11);
Flywheel casing (12) and closed gear case (3) leftmost side gear axis connection, closed gear case (3) leftmost side gear shaft and clutch Mechanism (14), speed reducer (15) and servo motor (16) are coaxially arranged;
Servo motor (16) is connect with speed reducer (15), and speed reducer (15) passes through clutch (14) and closed gear case (3) most Left side gear axis connection.
2. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The variable-frequency motor (1) and servo motor (16) parallel arrangement, and variable-frequency motor (1) and servo motor (16) respectively with close tooth Roller box (3) two sides gear axis connection;
In low speed quasi-static test, clutch (14) is in bonding state, by servo motor (16), speed reducer (15) and turns round Square loader (5) drive load, for carrying out the slow-speed test including contact patch, Static transmissions error;
In high speed dynamic test, clutch (14) is in discrete state, by variable-frequency motor (1) and torque loading device (5) Drive load, for carrying out the high-speed test (HST) including dynamic transmission error, vibration signal and boundary temperature.
3. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The master accompanies examination gear-box (7) and accompanies in examination gear-box (9), and spiral bevel gear, transmission shaft, bearing and bearing block are using integration Design, spiral bevel gear and transmission shaft connected by hydraulic expansion mode, and cantilever support is in main examination gear-box/accompany examination gear-box Cabinet on, for adapting to the test demand of spiral bevel gear pair under different apex to crowns.
4. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The system also includes first shaft coupling (2);
The variable-frequency motor (1) passes through first shaft coupling (2) and closed gear case (3) rightmost side gear axis connection.
5. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The system also includes second shaft coupling (4);
Closed gear case (3) rightmost side gear shaft is connect by second shaft coupling (4) with torque loading device (5).
6. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The system also includes third shaft coupling (6);
The torque loading device (5) is connect by third shaft coupling (6) with main examination gear-box (7).
7. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The system also includes the 4th shaft couplings (8);
The main examination gear-box (7) is connect by the 4th shaft coupling (8) with accompanying between examination gear-box (8).
8. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The system also includes the 5th shaft couplings (10);
It is described that examination gear-box (9) is accompanied to connect by the 5th shaft coupling (10) with flywheel casing (12), the 5th shaft coupling (10) and flywheel Torque sensor (11) are installed between case (12).
9. the continuously adjustable spiral bevel gear Power close pilot system of apex to crown as described in claim 1, which is characterized in that The system also includes the 6th shaft couplings (13);
The flywheel casing (12) passes through the 6th shaft coupling (13) and closed gear case (3) leftmost side gear axis connection.
CN201811509498.9A 2018-12-11 2018-12-11 The continuously adjustable spiral bevel gear Power close pilot system of apex to crown Pending CN109724796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811509498.9A CN109724796A (en) 2018-12-11 2018-12-11 The continuously adjustable spiral bevel gear Power close pilot system of apex to crown

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811509498.9A CN109724796A (en) 2018-12-11 2018-12-11 The continuously adjustable spiral bevel gear Power close pilot system of apex to crown

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110864898A (en) * 2019-10-28 2020-03-06 浙江大学 High-power bevel gear comprehensive performance test bed capable of being quickly replaced and assembled
CN113203562A (en) * 2021-04-19 2021-08-03 中国航发湖南动力机械研究所 Gear dynamic stress measuring system
CN113418671A (en) * 2021-05-11 2021-09-21 中国船舶重工集团公司第七0三研究所 Drop-out type gear box impact test bed and test method thereof
CN113418697A (en) * 2021-08-07 2021-09-21 西北工业大学 Multifunctional spiral bevel gear experiment table
CN114279702A (en) * 2021-11-18 2022-04-05 太原重工轨道交通设备有限公司 Load test device for gear transmission system of rail engineering vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007040106A1 (en) * 2007-08-24 2009-02-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Mobile torque calibration device for e.g. engine dynamometer, has sensor subjected with reference torque sensor by calibration torque, where electric motor is arranged on frame of carriage
CN101957260A (en) * 2010-06-23 2011-01-26 国营武汉长虹机械厂 Closed type comprehensive test device for high-power gearbox machinery
CN202994465U (en) * 2012-12-28 2013-06-12 四川诚邦测控技术有限公司 Double-change gearbox test system for engineering machinery
CN103234747A (en) * 2013-03-28 2013-08-07 浙江大学 Test stand capable of adjusting installation errors for comprehensive performance of spiral bevel gears
CN105458317A (en) * 2015-12-02 2016-04-06 四川凌峰航空液压机械有限公司 Hydraulic tensioning clamping mandrel for thin-wall shaft sleeve
CN107588951A (en) * 2017-09-23 2018-01-16 吉林大学 A kind of low-temperature test platform of two casees face-to-face synchronous belt power closed loop compensation drivings

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007040106A1 (en) * 2007-08-24 2009-02-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Mobile torque calibration device for e.g. engine dynamometer, has sensor subjected with reference torque sensor by calibration torque, where electric motor is arranged on frame of carriage
CN101957260A (en) * 2010-06-23 2011-01-26 国营武汉长虹机械厂 Closed type comprehensive test device for high-power gearbox machinery
CN202994465U (en) * 2012-12-28 2013-06-12 四川诚邦测控技术有限公司 Double-change gearbox test system for engineering machinery
CN103234747A (en) * 2013-03-28 2013-08-07 浙江大学 Test stand capable of adjusting installation errors for comprehensive performance of spiral bevel gears
CN105458317A (en) * 2015-12-02 2016-04-06 四川凌峰航空液压机械有限公司 Hydraulic tensioning clamping mandrel for thin-wall shaft sleeve
CN107588951A (en) * 2017-09-23 2018-01-16 吉林大学 A kind of low-temperature test platform of two casees face-to-face synchronous belt power closed loop compensation drivings

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110864898A (en) * 2019-10-28 2020-03-06 浙江大学 High-power bevel gear comprehensive performance test bed capable of being quickly replaced and assembled
CN110864898B (en) * 2019-10-28 2020-10-16 浙江大学 High-power bevel gear comprehensive performance test bed capable of being quickly replaced and assembled
CN113203562A (en) * 2021-04-19 2021-08-03 中国航发湖南动力机械研究所 Gear dynamic stress measuring system
CN113418671A (en) * 2021-05-11 2021-09-21 中国船舶重工集团公司第七0三研究所 Drop-out type gear box impact test bed and test method thereof
CN113418697A (en) * 2021-08-07 2021-09-21 西北工业大学 Multifunctional spiral bevel gear experiment table
CN113418697B (en) * 2021-08-07 2023-07-14 西北工业大学 Multifunctional spiral bevel gear experiment table
CN114279702A (en) * 2021-11-18 2022-04-05 太原重工轨道交通设备有限公司 Load test device for gear transmission system of rail engineering vehicle
CN114279702B (en) * 2021-11-18 2024-04-16 太原重工轨道交通设备有限公司 Load test device for gear transmission system of track engineering vehicle

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Application publication date: 20190507

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