CN1299842C

CN1299842C - Exciting method and vibration exciter for torsional damper performance test bed

Info

Publication number: CN1299842C
Application number: CNB2004100252795A
Authority: CN
Inventors: 沈瑜铭; 李松和; 翟昕; 俞小莉
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2004-06-11
Filing date: 2004-06-11
Publication date: 2007-02-14
Anticipated expiration: 2024-06-11
Also published as: CN1583288A

Abstract

The present invention discloses a vibration exciting method and a vibration exciter for torsional damper performance test beds. In the process of the rotation of a camshaft, the camshaft is periodically subjected to the pressure which is exerted on a cam by a hydraulic plunger pump. Consequently, vibration exciting moment is generated. The size of the vibration exciting moment is adjusted through hydraulic pressure. The change rule of vibration exciting force along with time is controlled by changing the shape line of the cam on a rotary shaft of the vibration exciter. A proper cam shape line can achieve the goal of fitting the vibration exciting moment of an actual engine. The vibration exciter is driven by a speed adjusting motor through an elastic coupling with large flexibility, which is favourable for protecting the motor. The output end of the vibration exciter is connected with the back end of a torsional vibration shaft through the coupling. In addition, the vibration exciter can also simulate torsional vibration conditions of four-stroke engines such as four-cylinder devices, eight-cylinder devices, etc. through the number of plunger pumps and simple changes of the arrangement of the plunger pumps on a shell body of the vibration exciter.

Description

Torsional vibration damper performance test stand vibrator

Technical field

The present invention relates to a kind of torsional vibration damper performance test stand vibrator.

Background technology

Engine shaft is that intrinsic elasticity and the multiple humorous moment of torsion of periodicity that is applied to it make and produce twisting vibration and become inevitable.Along with internal combustion engine is continually strengthened, the flexible increase and the raising of rotating speed etc. are reversed by the lengthening of axle system, axle system, and the torsional vibration problems of axle system is become increasingly conspicuous.Solving the Torsional Vibration efficient ways is to engine assembling torsional vibration damper.The method for designing and the processing and manufacturing level of torsional vibration damper all can not guarantee its vibration damping usefulness fully at present.Therefore, exploitation torsional vibration damper performance test stand is imperative.The core of torsional vibration damper performance test stand is a torsional activator, the torsional vibration excitation moment that it should be able to altitude simulation engine crankshaft system.The present invention has realized this function with hydraulic cam mechanism.

The performance of torsional vibration damper can be carried out experimental test by two kinds of approach: one, shock absorber is carried out the engine pedestal experiment, and analyze its performance quality by a cover torsional oscillation testing equipment.This method directly utilizes engine to make vibration source, and condition of work is truer, but environmental disturbances noise complexity is unfavorable for signal analysis and processing, and the result of the test deviation is bigger, and can bring consequences such as fuel consume, air pollution, and the mounting or dismounting shock absorber is also very inconvenient; Its two, simulated test promptly designs an exciter test platform, in order to the axle system and the vibrational state thereof of simulated engine, can judge the performance of shock absorber by measuring relevant parameter.By contrast, the latter has the former incomparable superiority.

Complete torsional vibration damper testing stand is also few both at home and abroad at present.External state-of-the-art torsional vibration damper experimental facilities adopts driven by servomotor, and the high frequency pole-changing performance by servomotor evokes twisting vibration.This equipment and technology complexity costs an arm and a leg.The domestic existing testing stand is tested based on the resonance method principle, University Of Chongqing has developed engine silicon oil damper testing stand, the centrifugal force that this equipment utilization produces when neither the eccentric mass of balance gear rotates evokes twisting vibration, its installation accuracy requires high, and, can not detect the dynamic characteristic of shock absorber because the torsional oscillation axle is only turned round and do not changeed.Domestic have some rotary damper test stands in addition, and all the driving torque difference of driving torque that produces because of vibrator and actual engine is too big, and test effect is not good.

Summary of the invention

In order to have solved the problems referred to above, the object of the present invention is to provide a kind of torsional vibration damper performance test stand vibrator that produces driving torque by cam and hydraulic coupling.

The technical solution adopted for the present invention to solve the technical problems is:

One, excitation method

Utilize in the camshaft rotation process, periodically be subjected to hydraulic planger pump and put on pressure on the cam, thereby produce driving torque.

Two, vibrator

Cam cooperates with the vibrator rotating shaft by flat key, the vibrator rotating shaft is bearing on the vibrator housing by the single-row tapered roller bearing at two ends respectively, plunger one end center drilling, the other end has groove, the plunger that 2～4 centres have a groove cooperates with separately plunges pump body respectively, in each plunger one end center drilling and between the plunges pump body stage clip is housed, in each the plunger other end groove single-row radial ball bearing is housed, 2～4 plunges pump bodies are distributed on the vibrator housing, and use bolting, advancing that oil circuit is connected all is housed on each plunges pump body, go out the hydraulic oil pipe joint, single-row radial ball bearing contacts with cam face, the input of vibrator rotating shaft is equipped with the big flexibility yielding coupling of being made up of two yielding coupling dishes, the output of vibrator rotating shaft links to each other with the torsional oscillation axle by shaft coupling, and vibrator housing base is installed on the body.

The useful effect that the present invention has is: vibrator of the present invention, simulate the exciting rule of six cylinder four-stroke engines: bent axle whenever takes two turns, and is subjected to exciting six times.For reduce and cam between friction, use roller follower.For lubricated cam and guarantee the cleaning of their working environments, camshaft is sealed in the housing, and adopts the flooding system lubrication mode.The size of driving torque is adjusted by hydraulic pressure, and rule is by changing the shape line traffic control of vibrator rotating shaft overhead cam over time for exciting force, and suitable cam profile can reach the purpose of match actual engine driving torque.Vibrator is driven by big flexibility yielding coupling by buncher, and this helps the protection to motor itself.The output of vibrator links to each other with the torsional oscillation shaft rear end by shaft coupling.In addition, by the simple change to plunger displacement pump number and its layout on the vibrator housing, this vibrator also can be simulated the torsional oscillation situation of four-stroke engine such as four cylinders, eight cylinders.

Description of drawings

Fig. 1 is a structural principle schematic diagram of the present invention;

Fig. 2 is a left view of the present invention;

Fig. 3 is the enlarged drawing of plunger;

Fig. 4 is the plunges pump body enlarged drawing.

Among the figure: 1, body, 2, plunges pump body, 3, stage clip, 4, plunger, 5, single-row radial ball bearing, 6, straight pin, 7, the vibrator housing, 8, cam, 9, the vibrator rotating shaft, 10, yielding coupling dish bullet, 11, property shaft coupling dish, 12, the hydraulic oil pipe joint

The specific embodiment

Excitation method of the present invention is to utilize in the camshaft rotation process, periodically is subjected to hydraulic planger pump and puts on pressure on the cam, thereby produce driving torque.

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the present invention includes cam 8 cooperates with vibrator rotating shaft 9 by flat key, vibrator rotating shaft 9 is bearing on the vibrator housing 7 by the single-row tapered roller bearing at two ends respectively, plunger 4 one end center drillings 4.1, the other end has groove 4.2, the plunger 4 that three centres have a groove 4.2 cooperates with separately plunges pump body 2 respectively, in each plunger 4 one end center drillings 4.1 and between the plunges pump body stage clip 3 is housed, in each plunger 4 other end groove 4.3 single-row radial ball bearing 5 is housed, straight pin 6 passes plunger 4 groove lateral aperture 4.3, single-row radial ball bearing 5 holes are single-row radial ball bearing 5 fixedly, three plunges pump bodies 2 are distributed on the vibrator housing 7, and use bolting, advancing that oil circuit is connected all is housed on each plunges pump body 2, go out hydraulic oil pipe joint 12, single-row radial ball bearing 5 contacts with cam 8 surfaces, the input of vibrator rotating shaft 9 is equipped with by two yielding coupling dishes 10, the 11 big flexibility yielding couplings of forming, the output of vibrator rotating shaft 9 links to each other with the torsional oscillation axle by shaft coupling, and vibrator housing 7 bases are installed on the body 1.

During work, motor is two tie-plates of shaft coupling by big flexibility yielding coupling 10,11, they cooperate the rotating shaft of driving vibrator respectively with motor reel and vibrator rotating shaft, vibrator rotating shaft 9 drives cam 8 and rotates together, and the output of vibrator rotating shaft 9 links to each other with the torsional oscillation axle by shaft coupling.When in the hydraulic pressure oil duct oil pressure being arranged, moving two circles of cam revolution are subjected to six excitations, and promptly hydraulic coupling is six works done by plunger displacement pump to the torsional oscillation axle, for the twisting vibration of torsional oscillation axle provides energy.

Claims

1, a kind of torsional vibration damper performance test stand vibrator, it is characterized in that: cam (8) cooperates with vibrator rotating shaft (9) by flat key, vibrator rotating shaft (9) is bearing on the vibrator housing (7) by the single-row tapered roller bearing at two ends respectively, plunger (4) one end center drillings (4.1), the other end has groove (4.2), the plunger (4) that 2～4 centres have groove (4.2) cooperates with separately plunges pump body (2) respectively, in each plunger (4) one end center drilling (4.1) and between the plunges pump body stage clip (3) is housed, single-row radial ball bearing (5) is housed in each plunger (4) other end groove (4.2), 2～4 plunges pump bodies (2) are distributed on the vibrator housing (7), and use bolting, advancing that oil circuit is connected all is housed on each plunges pump body (2), go out hydraulic oil pipe joint (12), single-row radial ball bearing (5) contacts with cam (8) surface, the input of vibrator rotating shaft (9) is equipped with by two yielding coupling dishes (10,11) the big flexibility yielding coupling of Zu Chenging, the output of vibrator rotating shaft (9) links to each other with the torsional oscillation axle by shaft coupling, and vibrator housing (7) base is installed on the body (1).