CN102768116B - General reducer testing table - Google Patents
General reducer testing table Download PDFInfo
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- CN102768116B CN102768116B CN201210225611.7A CN201210225611A CN102768116B CN 102768116 B CN102768116 B CN 102768116B CN 201210225611 A CN201210225611 A CN 201210225611A CN 102768116 B CN102768116 B CN 102768116B
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Abstract
The invention discloses a kind of general reducer testing table, comprise testing table base, for driving the driver element of main examination reductor, for arranging the first mounting bracket of main examination reductor and providing the loading unit of loading to main examination reductor, wherein, driver element is arranged on testing table base, and in the first mounting bracket and loading unit, at least one position is arranged on testing table base adjustably, makes the distance adjustable between described first mounting bracket and described loading unit.The present invention is based on testing table base, driver element, loading unit, the first mounting bracket are all arranged on testing table base, the distance of the first mounting bracket and loading unit is adjustable, form a basic general reducer testing table with this, general reducer testing table of the present invention can be applicable to the reductor of different size type.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of general reducer testing table.
Background technology
Reductor is as the important composition parts of engineering machinery, and its quality serviceability, operational security, serviceable life etc. on car load manufacturing quality all can produce important impact.Manufacturing firm generally all can carry out stricter inspection to composition parts each in reductor, and assemble in strict accordance with linkage editor and technological requirement, but the quality of the final reductor assembly formed how, necessary reductor complete machine inspection and the break-in of certain hour must be carried out.If there are quality problems when reductor uses, not only can shorten the serviceable life of reductor, also easily cause complete vehicle quality accident.Therefore, will carry out load test, strength test and torture test etc. to reductor, both can have been checked the quality of the products by test, the supplemental characteristic simultaneously again by obtaining test carries out analysiss and contrasts, for the improvement of product and optimization provide reliable foundation.
Existing reductor testing table is loaded by electric eddy current dynamometer usually, to complete the performance test of crawler travel speed reducer loading, fatigue strength, transmission efficiency, but can not be widely used in the performance test of other type reductor.One being produced to the manufacturer of many moneys reductors, is obviously specially unpractical for every money reductor all makees a testing table that can detect its performance, because this needs the cost of at substantial, manpower and space.
Summary of the invention
In view of this, the present invention proposes a kind of general reducer testing table, and it can be applicable to the reductor of different size type.
On the one hand, the invention provides a kind of general reducer testing table, comprise testing table base, for driving the driver element of main examination reductor, for arranging the first mounting bracket of described main examination reductor and providing the loading unit of loading to described main examination reductor, wherein, described driver element is arranged on described testing table base, and in described first mounting bracket and described loading unit, at least one position is arranged on described testing table base adjustably, makes the distance adjustable between described first mounting bracket and described loading unit.
Further, general reducer testing table of the present invention also comprises:
For regulating the first adjusting part of the relative position of described first mounting bracket and described loading unit, described first adjusting part is connected with described first mounting bracket; And/or
For regulating the second adjusting part of the relative position of described first mounting bracket and described loading unit, described second adjusting part is connected with described loading unit.
Further, described first adjusting part comprises the first ball-screw and the first axial guidance, described first ball-screw is connected with described first mounting bracket, described first mounting bracket is slidably disposed on described first axial guidance, and described first axial guidance is fixedly installed on described testing table base;
Described second adjusting part comprises the second ball-screw and the second axial guidance, described second ball-screw is connected with described loading unit, described loading unit is slidably disposed on described second axial guidance, and described second axial guidance is fixedly installed on described testing table base.
Further, described driver element comprises:
Drive motor, described drive motor is arranged on described testing table base;
First torque sensor, described first torque sensor is connected with the output terminal of described drive motor, and described drive motor is driven by described first torque sensor and connects described main examination reductor.
Further, described loading unit comprises accompanies examination reductor, loading motor and the second torque sensor, wherein, the described output terminal of examination reductor of accompanying is connected with the output terminal of described main examination reductor, and the output terminal of described loading motor is driven described in connection by described second torque sensor accompanies examination reductor; And
Described examination reductor of accompanying is connected with described second ball-screw, and is slidably disposed on described second axial guidance.
Further, described driver element also comprises the first transmission shaft, and one end of described first transmission shaft is connected with described first torque sensor, and the other end is for connecting described main examination reductor, and described first transmission shaft is extension type universal drive shaft; And/or
Described loading unit also comprises second driving shaft, and one end of described second driving shaft is connected with described second torque sensor, and the other end tries reductor be connected with described accompanying, and described second driving shaft is extension type universal drive shaft.
Further, described loading unit also comprises reductor web member, described in accompany examination reductor be coaxially connected by described reductor web member with described main examination reductor.
Further, described reductor web member is flexible connecting member.
Further, described loading unit also comprises axial loading component and/or radial loaded parts, and wherein, described axial loading component tries reductor be connected with described accompanying, described in passing through, accompany examination reductor to provide axial loading to described main examination reductor;
Described radial loaded parts are connected with the side of described reductor web member, to provide radial loaded by described reductor web member to described main examination reductor.
Further, described loading unit also comprises the second mounting bracket, described in accompany examination reductor be fixedly installed on described second mounting bracket,
Described examination reductor of accompanying is slidably disposed on described second axial guidance by described second mounting bracket.
Further, described axial loading component is axial load cylinder, and one end of described axial load cylinder is connected with described second mounting bracket, and the other end is fixedly installed on described testing table base; And/or
Described radial loaded parts comprise radial loaded oil cylinder, and one end of described radial loaded oil cylinder is connected with described reductor web member, and the other end is fixedly installed on described first mounting bracket and/or the second mounting bracket.
Further, between described axial load cylinder and described second mounting bracket, and be provided with pressure transducer between described radial loaded oil cylinder and described reductor web member.
Further, described radial loaded oil cylinder has two, comprises the first radial loaded oil cylinder and the second radial loaded oil cylinder, wherein,
One end of described first radial loaded oil cylinder is connected with described reductor web member, and the other end is fixedly installed on described first mounting bracket;
One end of described second radial loaded oil cylinder is connected with described reductor web member, and the other end is fixedly installed on described second mounting bracket.
The present invention of the present invention is based on testing table base, driver element, loading unit, the first mounting bracket are all arranged on testing table base, the distance of the first mounting bracket and loading unit is adjustable, form a basic general reducer testing table with this, general reducer testing table of the present invention can be applicable to the reductor of different size type.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of general reducer testing table embodiment provided by the invention;
Fig. 2 is the schematic side view of the embodiment shown in Fig. 1;
Fig. 3 is the schematic top plan view of the embodiment shown in Fig. 1.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
In addition, directional terminology described herein as axial, radial, unless otherwise indicated, should be understood to be with main examination reductor for reference, refer to axial direction and the radial direction of main examination reductor respectively.
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in further detail:
As shown in Figure 1, the invention provides a kind of general reducer testing table embodiment, it comprises testing table base 1, for driving the driver element of main examination reductor, for arranging the first mounting bracket 6 of main examination reductor and providing the loading unit of loading to main examination reductor, wherein, driver element, the first mounting bracket 6 and loading unit are arranged on testing table base 1, and the distance adjustable between the first mounting bracket 6 and loading unit.
The first mounting bracket 6 on general reducer testing table of the present invention is for installing main examination reductor, on testing table base 1, distance between this first mounting bracket 6 and loading unit can adjust, the space between the first mounting bracket 6 and loading unit is made to allow to hold the reductor of different size model after adjustment, thus, the reductor that general reducer testing table of the present invention can be applicable to different model is tested.
Skilled person should be understood that, when utilizing reductor testing table to test reductor in existing technology, usually utilize the sensor such as torque sensor, pressure transducer to driving torque or load moment of torsion and each force value and monitor, general reducer testing table of the present invention also can utilize similar sensor to carry out data monitoring, hereafter will discuss at needs place, repeat no more herein.As shown in Figure 1, as a preferred embodiment, general reducer testing table of the present invention comprises testing table base 1; Driver element, driver element comprises drive motor 3, first torque sensor 4, first transmission shaft 5; Loading unit, loading unit comprises reductor web member 7, second mounting bracket 8, second driving shaft 9, second torque sensor 10, loading motor 11, and do not show in figure accompany examination reductor; Loading unit after Function Extension also additionally comprises axial load cylinder 13, radial loaded oil cylinder 14.General reducer testing table of the present invention also comprises for first ball-screw 2, second ball-screw 12 and second axial guidance 15 of adjustment first mounting bracket 6 with the spacing of loading unit.
In this embodiment, the left part mainly driver element of testing table front view, wherein, drive motor 3 and loading motor 11 are fixedly installed on testing table base 1, the output terminal of drive motor 3 connects the first torque sensor 4, and then connect the first transmission shaft 5, first transmission shaft 5 for being connected with the input end of the main examination reductor be arranged on the first mounting bracket 6.First mounting bracket 6 can be arranged in the first axial guidance (not shown), first axial guidance is fixedly installed on testing table base 1, and the first mounting bracket 6 is connected with the first ball-screw 2, the first ball-screw 2 also connects promising its provides the motor of power source.
The right part mainly loading unit of testing table front view, each composition component of loading unit and the composition component almost symmetry of aforementioned driver element.The rightmost side is loading motor 11, the output terminal of loading motor 11 is connected with second driving shaft 9 by the second torque sensor 10, second driving shaft 9 is connected to again the input end of accompanying examination reductor (not shown) be arranged on the second mounting bracket 8, accompanies the output terminal of examination reductor to be connected by the output terminal of reductor web member 7 in above-mentioned main examination reductor.Equally, second mounting bracket 8 is slidably disposed on the second axial guidance 15, second axial guidance 15 is fixedly installed on testing table base 1, and the second mounting bracket 8 is also connected with the second ball-screw 12 of the low order end of testing table, and testing table is also provided with the motor of driving second ball-screw 12.Optionally, this second axial guidance 15 and above-mentioned first axial guidance can be overall guide rails, and this integrated guide rail is arranged on testing table base 1, and the first mounting bracket 6 and the second mounting bracket 8 are all arranged on this integrated guide rail.
Loading unit also comprises the axial loading component and radial loaded parts that are arranged on side, as as described in start herein, axis herein and radial direction all refer to main examination reductor shaft to and radial direction, the left and right directions namely in Fig. 1 is axially, and the left and right directions in Fig. 2 be radial direction.In the present embodiment, axially loading and radial loaded all adopt oil cylinder to load, wherein, as shown in Figure 3, the cylinder body of axial load cylinder 13 is fixedly installed in testing table base 1(Fig. 3 and omits testing table base 1) on, the piston rod of axial load cylinder 13 is fixedly connected with the second mounting bracket 8; Radial loaded oil cylinder 14 has two, comprise the first radial loaded oil cylinder and the second radial loaded oil cylinder, wherein, one end (such as tailpiece of the piston rod) of first radial loaded oil cylinder is connected with reductor web member 7, the other end (such as cylinder body end) is fixedly installed on the first mounting bracket 6, one end (such as tailpiece of the piston rod) of second radial loaded oil cylinder is connected with reductor web member 7, and the other end (such as cylinder body end) is fixedly installed on the second mounting bracket 8.In the present embodiment, preferred reductor web member 7 is terminal pad or connecting cylinder structure, make main examination reductor with accompany examination reductor be coaxially connected, reductor web member 7 comprises the inside connector of connection two reductor, with the outside connector being set in outside, outside connector can rotate around inner connector, similar bearing arrangement, inner connector is for connecting two reductors, and outside connector is for connecting radial loaded oil cylinder 14.
In addition, between axial load cylinder 13 and the second mounting bracket 8, also install between radial loaded oil cylinder 14 and reductor web member 7 and be provided with pressure transducer, in order to detect load cylinder applied pressure.
Before test, according to type and the size of main examination reductor to be tested, determine type and the size of accompanying examination reductor that match, and determine the installing space demand of two reductors, then the first ball-screw 2 and/or the second ball-screw 12 is driven by motor, adjust the distance between the first mounting bracket 6 and the second mounting bracket 8, to be adjusted after suitable distance, first mounting bracket 6 installs main examination reductor, second mounting bracket 8 is installed and accompanies examination reductor, after installation, the output terminal of main examination reductor is connected with reductor web member 7 with accompanying the output terminal trying reductor.
During test, start drive motor 3, drive motor 3 exports predetermined power, and passes to by the first torque sensor 4 and the first transmission shaft 5 the main examination reductor be arranged on the first mounting bracket 6, drives main examination reductor to rotate; Opposite side, loading motor 11 starts, export predetermined loading moment, pass to be arranged on by the second torque sensor 10 and second driving shaft 9 and second mounting bracket 8 accompanies examination reductor, accompany examination reductor to be applied the loading moment of torsion hindering it to rotate to main examination reductor by reductor web member 7.The driving force moment of torsion of the drive motor 1 in process of the test is detected by the first torque sensor 4, and the loading moment of torsion of loading motor 11 is detected by the second torque sensor 10.Drive motor is preferably controlled by AC converter, and rotating speed is stepless adjustable, to realize output torque continuously adjustabe.
In experimentation, due to drive motor 3, loading motor 11, the rotation of reductor etc. all can produce vibration, the connection state of each parts can be affected when vibrating excessive, normal work can be affected when especially making each parts produce axial error, for this reason, reductor web member 7 preferred flexible web member of the present invention, this flexible connecting member mainly the terminal pad of relatively existing rigidity or connecting cylinder structure relative, the web member of the unlike rigidity of flexible connecting member, the isostructural position relationship of reductor that two ends connect is required very strictly (such as, rigid connecting extend neck requires that two reductors must be that straight line is coaxial), but allow the reductor axial deviation within the specific limits that two ends connect, thus, at main examination reductor with when accompanying the running of examination reductor to occur axial deviation, reductor web member 7 can adapt to equally, and keep two reductor normal synchronized to rotate.
Further, the first transmission shaft 5 in the present embodiment and/or second driving shaft 9 all preferably adopt telescopic universal drive shaft, and telescopic universal drive shaft can eliminate the vibration that motor height rotating speed brings, and the axial error between each parts.Simultaneously, two torque sensors in the present embodiment are all preferably flange torque sensor, and the safe shear pin of employing between torque sensor with transmission shaft is connected, when the impulsive force in drive path is excessive, safe shear pin disconnects, and ensures the safety of whole kinematic train.Safe shear pin also can be arranged on the junction between transmission shaft and reductor.
In experimentation, axis and radial loaded need be carried out to main examination reductor, to simulate various axial, the radial load of reductor in actual condition, can provide axially load and radial loaded to meet axial load cylinder 13 in this demand the present embodiment and radial loaded oil cylinder 14.Axial load cylinder 13 utilizes telescopic piston rod, and to connected second mounting bracket 8 output shaft to loading force, this loading force tries reductor through accompanying, reductor web member 7 is passed to main examination reductor.Radial loaded oil cylinder 14 utilizes telescopic piston rod to apply radial force to reductor web member 7, and reductor web member 7 and main examination reductor try reductor be fixedly connected with accompanying, and further radial loaded power are passed to main examination reductor.
It should be noted that, on the one hand, radial loaded oil cylinder 14 one end of the present invention is connected with mounting bracket (mounting bracket 6 and/or 8), the other end is connected with reductor web member 7, and reductor web member 7 and two reductors are connected, such radial loaded oil cylinder 14 and reductor just have employed same mounting bracket, make radial loaded power and radial loaded oil cylinder 14 reacting force become the internal force of mounting bracket, can not damage the miscellaneous part of the present embodiment, on the other hand, although the above embodiment of the present invention enumerates the quantity of axial load cylinder 13 and radial loaded oil cylinder 14, but, those skilled in the art are to be understood that on the basis realizing axial and radial loaded, the present invention does not limit the quantity of load cylinder, such as, when using a radial loaded oil cylinder 14, also can by arranging suitable syndeton (as U-shaped or Y type web member) at radial loaded oil cylinder 14 two ends, its cylinder body end is connected with the first mounting bracket 6 and the second mounting bracket 8 simultaneously, and its tailpiece of the piston rod can be connected with the suitable position of reductor web member 7 simultaneously, to keep the stability of loading system.
Preferably having two radial loaded oil cylinders 14 in this embodiment is separately positioned on first, second mounting bracket, the other end is the corresponding two link places being arranged on reductor web member 7 respectively, can make to be applied to reductor web member 7 radial loaded power like this and more balance.It should be noted that, the quantity of radial loaded oil cylinder can need to reselect according to different tests; In like manner, the quantity of axial load cylinder is also optional.
Discussion in annexation described above, axial load cylinder 13 and radial loaded oil cylinder 14 are all connected with pressure transducer, are used for detecting its respective actual loaded power.
In addition, some test needs the temperature of main examination reductor privileged site, as bearing case temperature variation, can arrange degree of stability sensor at bearing case; The present embodiment preferably adopts infrared radio thermocouple temperature sensor to detect bearing skin temperature, utilizes high strength magnet to inhale on its surface, rotates together thereupon.
The above is one provided by the invention most preferred general reducer testing table embodiment, and except the above-mentioned alternative discussed, miscellaneous part also has optional allocation plan, such as:
1, two ball-screws are adopted to regulate the axial location of two mounting brackets respectively in above preferred embodiment, namely the first ball-screw 2 is for regulating the position of the first mounting bracket 6, second ball-screw 12 is for regulating the position of the second mounting bracket 8, according to the design requirement of testing table, also can configure a ball-screw as adjusting part, regulate the position of the first mounting bracket 6 or the second mounting bracket 8; In addition, as the possibility of adjusting part, gear & rack structure can also be adopted to replace above-mentioned ball screw arrangement, other equivalent versions that those skilled in the art can expect, as long as the position that can realize between adjustment first mounting bracket 6 and loading unit and general reducer testing table used in the present invention, and belong to the scope of the claims in the present invention protection;
2, in order to the vibration that reduces whole experimental system and the axial error eliminated between each link, especially the axial error caused is vibrated, in above preferred embodiment, be provided with telescopic universal drive shaft (the first transmission shaft 5) between first torque sensor 4 with main examination reductor to be connected, second torque sensor 10 tries also to be provided with telescopic universal drive shaft (second driving shaft 9) between reductor and is connected with accompanying, axial relative movement is there is when rotating in telescopic universal drive shaft at certain link at two ends that allows, or exist and match axial error, but, if other modes can be adopted to control vibration or the error of the parts on this general reducer testing table, or when vibrate or error do not affect test carry out, this telescopic universal drive shaft can correspondingly be replaced or cancel,
3, the axial loading component in above preferred embodiment and radial loaded parts all adopt hydraulic jack, also can select other power take-off mechanisms, as motor, pneumatic cylinder etc.;
4, the drive motor in above-described embodiment and loading motor all can select Switzerland ABB frequency conversion system, adopt the electric closure of common DC bus simultaneously.Drive motor is as motor, and loading motor is as generator, and the electric energy produced reoffers to driving motivation, greatly can save experimentation cost.
In sum, the present invention of the present invention is based on testing table base, based on adjusting part, driver element, loading unit, mounting bracket, the distance of the first mounting bracket and loading unit is adjustable, detect input speed with rotary speed torque sensor, load moment of torsion, with the temperature rise of reductor in the test of wireless thermocouple sensor record, the actual loaded power loaded with pressure transducer record hydraulic jack, forms a complete general reducer testing table.Testing table mainly through the various actual operating modes controlling drive motor rotating speed, loading motor moment of torsion simulates reductor, and is tested by the test of measuring rotating speed, input torque, output torque and correlation parameter and some cycles and is examined the performance index such as the rotation of reductor, fatigue strength and life-span.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a general reducer testing table, it is characterized in that, comprise testing table base (1), for driving the driver element of main examination reductor, for arranging first mounting bracket (6) of described main examination reductor and providing the loading unit of loading to described main examination reductor, wherein, described driver element is arranged on described testing table base (1), and described first mounting bracket (6) is arranged on described testing table base with at least one position in described loading unit adjustably, make the distance adjustable between described first mounting bracket (6) and described loading unit,
Described loading unit also comprises reductor web member (7), accompanies examination reductor to be coaxially connected by described reductor web member (7) with described main examination reductor;
Described loading unit also comprises radial loaded parts, and described radial loaded parts are connected with the side of described reductor web member (7), to provide radial loaded by described reductor web member (7) to described main examination reductor;
Described loading unit also comprises the second mounting bracket (8), described in accompany examination reductor be fixedly installed on described second mounting bracket (8),
Described examination reductor of accompanying is slidably disposed on the second axial guidance (15) by described second mounting bracket (8);
Described radial loaded parts comprise radial loaded oil cylinder (14), one end of described radial loaded oil cylinder (14) is connected with described reductor web member (7), and the other end is fixedly installed on described first mounting bracket (6) and/or the second mounting bracket (8).
2. general reducer testing table according to claim 1, is characterized in that, also comprise:
For regulating the first adjusting part of the relative position of described first mounting bracket (6) and described loading unit, described first adjusting part is connected with described first mounting bracket (6); And/or
For regulating the second adjustment group 25 of the relative position of described first mounting bracket (6) and described loading unit, described second adjusting part is connected with described loading unit.
3. general reducer testing table according to claim 2, it is characterized in that, described first adjusting part comprises the first ball-screw (2) and the first axial guidance, described first ball-screw (2) is connected with described first mounting bracket (6), described first mounting bracket (6) is slidably disposed on described first axial guidance, and described first axial guidance is fixedly installed on described testing table base (1);
Described second adjusting part comprises the second ball-screw (12) and the second axial guidance (15), described second ball-screw (12) is connected with described loading unit, described loading unit is slidably disposed on described second axial guidance (15), and described second axial guidance (15) is fixedly installed on described testing table base (1).
4. general reducer testing table according to claim 3, is characterized in that, described driver element comprises:
Drive motor (3), described drive motor (3) is arranged on described testing table base (1);
First torque sensor (4), described first torque sensor (4) is connected with the output terminal of described drive motor (3), and described drive motor (3) connects described main examination reductor by the driving of described first torque sensor (4).
5. general reducer testing table according to claim 4, it is characterized in that, described loading unit comprises accompanies examination reductor, loading motor (11) and the second torque sensor (10), wherein, the described output terminal of examination reductor of accompanying is connected with the output terminal of described main examination reductor, and the output terminal of described loading motor (11) is driven described in connection by described second torque sensor (10) accompanies examination reductor; And
Described examination reductor of accompanying is connected with described second ball-screw (12), and is slidably disposed on described second axial guidance (15).
6. general reducer testing table according to claim 5, it is characterized in that, single 25 yuan of described driving also comprises the first transmission shaft (5), one end of described first transmission shaft (5) is connected with described first torque sensor (4), the other end is for connecting described main examination reductor, and described first transmission shaft (5) is extension type universal drive shaft; And/or
Described loading unit also comprises second driving shaft (9), one end of described second driving shaft (9) is connected with described second torque sensor (10), the other end tries reductor be connected with described accompanying, and described second driving shaft (9) is extension type universal drive shaft.
7. general reducer testing table according to claim 6, is characterized in that, described reductor web member (7) is flexible connecting member.
8. general reducer testing table according to claim 6, it is characterized in that, described loading unit also comprises axial loading component, and described axial loading component tries reductor be connected with described accompanying, described in passing through, accompany examination reductor to provide axial loading to described main examination reductor.
9. general reducer testing table according to claim 8, it is characterized in that, described axial loading component is axial load cylinder (13), one end of described axial load cylinder (13) is connected with described second mounting bracket (8), and the other end is fixedly installed on described testing table base (1).
10. general reducer testing table according to claim 9, it is characterized in that, between described axial load cylinder (13) and described second mounting bracket (8), and be provided with pressure transducer between described radial loaded oil cylinder (14) and described reductor web member (7).
11. general reducer testing tables according to claim 10, is characterized in that, described radial loaded oil cylinder (14) has two, comprise the first radial loaded oil cylinder and the second radial loaded oil cylinder, wherein,
One end of described first radial loaded oil cylinder is connected with described reductor web member (7), and the other end is fixedly installed on described first mounting bracket (6);
One end of described second radial loaded oil cylinder is connected with described reductor web member (7), and the other end is fixedly installed on described second mounting bracket (8).
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| CN201210225611.7A CN102768116B (en) | 2012-07-03 | 2012-07-03 | General reducer testing table |
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| CN201210225611.7A CN102768116B (en) | 2012-07-03 | 2012-07-03 | General reducer testing table |
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