CN202267433U

CN202267433U - Crankshaft axial gap detection device

Info

Publication number: CN202267433U
Application number: CN2011203992477U
Authority: CN
Inventors: 范炳良; 陈庆樟; 孟杰
Original assignee: Changshu Institute of Technology
Current assignee: Changshu Institute of Technology
Priority date: 2011-10-19
Filing date: 2011-10-19
Publication date: 2012-06-06
Anticipated expiration: 2021-10-19

Abstract

A crankshaft axial gap detection device belongs to the technical field of special-purpose equipment for detecting shaft parts. The device comprises a door-shaped rack with a door-shaped cavity; an indicating gauge positioning mechanism arranged on the top part of the door-shaped rack; an indicating gauge fixed on the indicating gauge positioning mechanism; a first clamping block and a second clamping block arranged inside the door-shaped cavity, wherein a first V-shaped cavity is formed on one side of the first clamping block, which is faced with the second clamping block, and a second V-shaped cavity which is opposite to the first V-shaped cavity and is formed on one side of the second clamping block, which is faced with the first clamping block; a guide rod passing through a first longitudinal arm and a second longitudinal arm of the door-shaped rack, and the first clamping block and the second clamping block are sleeved on the middle part of the lengthwise direction of the guide rod; and a clamping block folding mechanism which is connected with the first and second clamping blocks and supported on the first and second longitudinal arms. The device is ideal in reliability and safety, detection precision of an axial gap of a crankshaft can be guaranteed; the device is suitable to be fixed on magnetic conductive and non magnetic conductive carriers; and the device is simple in integral structure and convenient for operating.

Description

Bent axle end play pick-up unit

Technical field

The utility model belongs to a detection axle base part SM technical field, is specifically related to a kind of bent axle end play pick-up unit

Background technology

are example with the bent axle of motor car engine; Because when engine operation; Bent axle can receive clutch coupling and put on the effect of the axial force on the flywheel and axial float trend occurs; So, use guaranteeing correct relative between each parts of toggle by the axial float restriction of axial thrust bearing (generally being sliding bearing) to bent axle.Yet during the bent axle expanded by heating, should allow it freely to extend again, so the axial direction positioning device on the bent axle is indispensable, promptly must have, but can only has a place that axial direction positioning device is set.

The axial direction positioning device at this place; The general slide thrust bearing that adopts; Its version has two kinds: the one, transverse bearing and axial thrust bearing are integrated, and process the flange sliding bearing, the flange part Control Shaft that promptly utilizes flanger bearing liner is to play; The 2nd, the thrust plate limit axial play with antifriction alloy layer of single system, the latter's application is extensive than the former, no matter but the former or the latter, purpose all is to hold the gap that pushes away between end face and the axle journal location shoulder, i.e. end play in order to control bearing.

in order to ensure the operate as normal of motor car engine parts, bent axle must leave end play, but the end play of bent axle has strict control requirement.The gap is too small, can make the parts expanded by heating and blocks; Excesssive gap, the front and back play destroys correct relative between each parts of toggle as previously mentioned, brings abnormal wearing and tearing to piston rod part.Moreover thrust bearing surface weares and teares gradually in the engine use, and the gap is increased, and forms axial displacement.Therefore, during built-up crankshaft, should carry out the inspection of bent axle end play.

Detection to bent axle end play in prior art detects by means of dial gauge usually; Structure is as shown in Figure 4; Specifically: earlier dial gauge 3 is installed on the dial framework of Magnetic gauge stand, opens the Magnetic gauge stand switch again, Magnetic gauge stand is adsorbed on the automobile engine cylinder body side plane; Then adjust the dial framework connecting link of Magnetic gauge stand; The feeler lever crown that makes dial gauge gives the amount of the roof pressure about 1 ㎜ on the end face of crankshaft front end axle, the dial plate that rotates dial gauge again makes the indicator of dial gauge point to zero position.Then with crow bar or similar instrument forward and backward bent axle that prizes between crankshaft main bearing pedestal and crank arm, the indicator hunting range of dial gauge is the end play of bent axle.The end play of bent axle is generally 0.05-0.18 ㎜, and operating limit is 0.30 ㎜ (confirming according to engine model).Excessive or too small like end play, then should change or repair thrust bearing.

are because the structure of above-mentioned bent axle end play pick-up unit is unreasonable; Thereby produce following technical matters: the one, operate the reliability and the poor stability that promptly detect; Because the placement location of Magnetic gauge stand is difficult to hold or because of the factor of magnetic force cause with the cylinder body adhesive unreliable; Particularly be stained with the cylinder body of greasy dirt, have the anxiety of falling; The 2nd, be difficult to guarantee the end face squareness between dial gauge measuring head and the measured object, cause measuring error big, promptly influence measuring accuracy; The 3rd, have the fastidious property of use, because, cause measurement to carry out owing to adsorbing so if Magnetic gauge stand runs into the nonmetal non-magnet material that promptly runs into; The 4th, troublesome poeration and because the magnetic force factor is prone to cause the absorption of iron filings and loses cleaning.

the applicant has carried out literature search; China utility model patent Granted publication CN201348486Y recommends to have " a kind of device of detection of engine bent axle end play "; This patent scheme can be avoided aforesaid some shortcoming, for example need not to be adsorbed on the cylinder body, but has shortcoming poor for applicability; Because when detecting, need support bracket fastened two ends be fixed by means of set bolt and crankcase; Yet because the size of the crankcase of different engines is different, so the universalization degree is low.

The structure of " a kind of steering axle assembly end play pick-up unit " that Granted publication CN201407983Y provides is similar with aforesaid CN201348486Y basically, thereby with depositing aforementioned shortcoming.

In view of above-mentioned prior art, be necessary to improve, for this reason, the applicant has done actively and good try, and under secrecy provision, is practicable through facts have proved, and the technical scheme that will introduce below produces under this background

Summary of the invention

The task of the utility model is to provide a kind of reliability and security that helps to ensure detection, help guaranteeing accuracy of detection, be of value to the fastidious property when avoiding the use of and use location and can not occur fall or the move about situation and have be good at embody structure terse and easy to operate bent axle end play pick-up unit of adaptation on magnetic conduction and non-magnetic conduction carrier.

The task of the utility model is accomplished like this, and a kind of bent axle end play pick-up unit comprises a portal that constitutes door-shape cavity; One dial gauge detent mechanism, this dial gauge detent mechanism are arranged on the top of said portal and are positioned at the middle position of length direction at the top of portal substantially; One dial gauge, this dial gauge is fixed on the said dial gauge detent mechanism, wherein with the horizontally-arranged state of level: the table body of this dial gauge leans out a side at the top of portal, and the gauge outfit of dial gauge leans out the opposite side at portal top; One first fixture block and one second fixture block; The cooperation that faces each other of this first, second fixture block; And be positioned at described door-shape cavity; Constitute one first v-shaped cavity at first fixture block towards a side of second fixture block, and constitute one second v-shaped cavity towards a side of first fixture block and in the position corresponding to said first v-shaped cavity at second fixture block, first, second v-shaped cavity is fitted to each other; One guide rod, this guide rod are set on first trailing arm and second trailing arm of portal, and described first fixture block and second fixture block are placed on the middle part of the length direction of this guide rod movably; One is used to order about the fixture block open-and-close mechanism that said first, second fixture block closes up each other or the phase mutual exclusion is opened, and this fixture block open-and-close mechanism is connected with second fixture block with first fixture block, and is supported on rotationally on described first trailing arm and second trailing arm.

are in one of the utility model concrete embodiment; Described dial gauge detent mechanism comprises first, second holder and trip bolt; First holder is fixed on the top of said portal and is positioned at the middle position at the top of portal; Constitute one first semicircle groove at this first holder towards a side of second holder; Second holder is formed on first holder, constitutes one second semicircle groove at this second holder towards a side of first holder and in the position corresponding to first semicircle groove, and first, second semicircle groove is fitted to each other and constitutes circular cavity; Trip bolt revolves and fits on second holder and revolve and in first holder, the table body of described dial gauge is fixed between first, second holder.

in another concrete embodiment of the utility model, described table body has a table body fixed bar, and this table body fixed bar is corresponding in described first, second semicircle groove.

are in another concrete embodiment of the utility model; Offer a guide rod sliding eye on the top of described first trailing arm; And offering a guide rod fixed orifice on the top of second trailing arm, this guide rod fixed orifice is corresponding with the guide rod sliding eye; Middle position on the top of described first fixture block offers one first slide guide hole; And offer one second slide guide hole in the middle position on the top of described second fixture block; First, second slide guide hole corresponds to each other; And this first, second slide guide hole is also corresponding with described guide rod sliding eye and guide rod fixed orifice, and described guide rod passes guide rod sliding eye, first slide guide hole and second slide guide hole successively and described guide rod fixed orifice is fixed.

are in another concrete embodiment of the utility model; Said guide rod is provided with the qualification bead of a diameter greater than the diameter of said guide rod sliding eye towards the expansion of an end end of said first trailing arm, and is equipped with a snap ring at guide rod towards an end of said second trailing arm and in the end that leans out said guide rod fixed orifice.

also have among the concrete embodiment the utility model, in the wall of the chamber of described first v-shaped cavity, are provided with one first protection pad, and in the wall of the chamber of described second v-shaped cavity, are provided with one second protection pad.

the utility model more and among concrete embodiment, described first protection pad and described second protection pad are rubber, nylon or on-woven fiber felt.

the utility model so that concrete embodiment in; The bottom of described first fixture block is provided with first feed screw nut; And the bottom of described second fixture block is provided with second feed screw nut; First, second feed screw nut corresponds to each other; Revolve screw mandrel about described fixture block open-and-close mechanism comprises, revolve, first bracket and second bracket, about revolve screw mandrel and revolve and be assigned on first feed screw nut and second feed screw nut, revolve and revolve on the screw mandrel about being fixed on; First bracket corresponding to about revolve screw mandrel an end the below and fix with the bottom of said first trailing arm, second bracket corresponding to about revolve screw mandrel the other end the below and fix with the bottom of said second trailing arm.

are at again more and among concrete embodiment of the utility model; Be concaved with the recessed road of one second semicircle at described first bracket towards a side of said first trailing arm; And in the bottom of first trailing arm and be concaved with the recessed road of one second semicircle corresponding to the recessed position of first semicircle, the recessed road of first, second semicircle corresponds to each other; Be concaved with the recessed road of one the 3rd semicircle at described second bracket towards a side of said second trailing arm, and be concaved with the recessed road of one the 4th semicircle in the bottom of second trailing arm and in the position corresponding to the recessed road of the 3rd semicircle, the recessed road of the 3rd, the 4th semicircle corresponds to each other.

are at again and then among concrete embodiment of the utility model; When match with said first feed screw nut said about when revolving screw thread on the screw mandrel and being left-hand thread (LHT), then match with said second feed screw nut said about the screw thread that revolves on the screw mandrel be right-hand thread; And when match with said first feed screw nut said about when revolving screw thread on the screw mandrel and being right-hand thread, then match with said second feed screw nut said about the screw thread that revolves on the screw mandrel be left-hand thread (LHT).

The technical scheme that the utility model provides can by be provided on the portal and by first, second fixture block that the fixture block open-and-close mechanism orders about folding the unit under test bent axle is reliably clamped; And the gauge outfit of dial gauge vertically contacts on axle class assembling matrix transverse plane, thereby has desirable reliability and security and be able to ensure the accuracy of detection to the end play of bent axle; Prior art is is attached on the cylinder block by means of the magnetic suction type owing to need not to resemble, thereby is fit to be fixed on magnetic conduction and the non-magnetic conduction carrier, thereby but the expanded application scope; One-piece construction is simple and easy to operate.

Description of drawings

Fig. 1 is a concrete example structure figure of the utility model.

Fig. 2 is second bracket shown in Figure 1 and the synoptic diagram that cooperates of second trailing arm.

Fig. 3 is the application examples synoptic diagram of the utility model.

Fig. 4 is the pick-up unit and the application examples synoptic diagram of the bent axle end play in the prior art.

Embodiment

can be expressly understood the technical spirit and the beneficial effect of the utility model more for the auditor that the makes Patent Office especially public; The applicant general elaborates with the mode of embodiment below; But the description to embodiment all is not the restriction to the utility model scheme, any according to the utility model design done only for pro forma but not substantial equivalent transformation all should be regarded as the technical scheme category of the utility model.

Fig. 1 and Fig. 2 are asked for an interview in ; In Fig. 1, provided a portal 1; More properly say; Provided the portal 1 that have first, second trailing arm 12,13 and a door-shape cavity 11 an and shape is n shape substantially, offered a guide rod sliding eye 121 on the top of first trailing arm 12, and on the basal surface of first trailing arm 12, offer the recessed road 122 of one second semicircle; Offer a guide rod fixed orifice 131 on the top of second trailing arm 13, and on the basal surface of second trailing arm 13, offer the recessed road 132 of one the 4th semicircle (Fig. 2 shows); Top at portal 1 promptly offers adjustment fixed orifice 14 on the crossbeam of first, second trailing arm 12,13 of connection.In the present embodiment, adjustment fixed orifice 14 has three rows, and every row has a pair of, still, is not the restriction that receives this quantity, and adjustment fixed orifice 14 is used for fixing dial gauge detent mechanism 2.

preferably but not the dial gauge detent mechanism 2 that definitely is limited to comprises first, second holder 21,22 and trip bolt 23; First holder 21 adopts first screw 212 to be fixed on the aforesaid adjustment fixed orifice 14; In the present embodiment, first holder 21 being fixed on three teases and ridicule on the row's placed in the middle in the whole fixed orifice 14 a pair of adjustment fixed orifice 14.Second holder 22 in the present embodiment with first holder, 21 integral productions, but it is fixing with first holder 21 also can to make the back separately.Offer one first semicircle groove 211 at first holder 21 towards a side of second holder 22; And offer one second semicircle groove 221 towards a side of first holder 21 at second holder 22; First, second semicircle groove 211,221 corresponds to each other, and both cooperate the back to constitute a circular port.Trip bolt 23 is used for fixing dial gauge 3, revolve and the trip bolt hole 222 on second holder 22 in, and this trip bolt 23 also is threaded in the screw hole of first holder 21.

are being example by location status shown in Figure 1 at present; Dial gauge 3 is arranged on the aforesaid dial gauge detent mechanism 2 with the horizontally-arranged state of level; And the top that the table body 31 of this dial gauge 3 leans out portal 1 is a side of head piece; And the gauge outfit 32 of dial gauge 3 (dial gauge measuring head) is stuck in the top of portal 1 is the opposite side of head piece; Table body 31 is fixed on the dial gauge detent mechanism 2 through its table bar 311; Specifically: will show earlier bar 311 place aforesaid first, second semicircle groove 211, between 221, again trip bolt 23 is inserted trip bolt holes 222 and make trip bolt 23 be threaded on being preset in first holder 21 and with trip bolt hole 222 corresponding screw holes in.Aforesaid gauge outfit 32 can be movable in table bar 311.

Fig. 1 please be continued to see in ; One guide rod 6 penetrates guide rod fixed orifice 131 then after passing guide rod sliding eye 121; Constitute the diameter qualification bead 61 bigger than the diameter of guide rod sliding eye 121 towards an end end of first trailing arm 12 at this guide rod 6, and to offer one on the surface of these qualification bead 61 outwards both can be in-line, also can be criss-cross operating groove 611; In the time will making guide rod 6 operations, then can adopt instrument such as sieve type of criticizing to operating groove 611 operations.The end that leans out guide rod fixed orifice 131 at guide rod 6 offers annular groove (also can claim the jump ring groove, not shown), and in annular groove, is embedded snap ring 62 (also can claim jump ring).

Fig. 1 is please still seen in ; One first fixture block 4 and one second fixture block 5 that are positioned at door-shape cavity 11 have been provided; First, second fixture block 4,5 is fitted to each other; Offer one on the top of first fixture block 4 and be furnished with first slide guide hole 42 of slip cap, and offer nut bore, in nut bore, be provided with one first feed screw nut 43 in the bottom; Be designed with one first v-shaped cavity 41 at the middle part of first fixture block 4 and towards a side of second fixture block 5, and (chamber wall surface) is fixed with one first protection pad 411 (also can claim liner) on the wall of the chamber of this first v-shaped cavity 41.Offer on the top of second fixture block 5 and in position corresponding to first slide guide hole 42 one be furnished with slip cap second slide guide hole 52; And offer nut bore in the bottom and in position corresponding to aforesaid first feed screw nut 43; In this nut bore, be provided with one second feed screw nut 53; Offer one second v-shaped cavity 51 at the middle part of second fixture block 5 and towards a side of first fixture block 4, and (chamber wall surface) is fixed with one second protection pad 511 (also can claim liner) on the wall of the chamber of this second v-shaped cavity 51.

After being fitted to each other, aforesaid first, second v- shaped cavity 41,51 forms the cavity of a prismatic (◇); Aforesaid first, second protection pad 411,511 preferred rubber blankets that use; Fix with the cementation mode; Yet also can use nylon or on-woven fiber felt, perhaps use the material of other equivalence to fill the post of first, second protection pad 411,511.The rotation direction of aforesaid first, second feed screw nut's 42,53 screw thread (nut inner thread) is opposite each other, that is to say, when first feed screw nut's 43 screw thread was left-hand thread (LHT), then second feed screw nut's 53 screw thread was a right-hand thread, and vice versa.Aforesaid first, second slide guide hole 42,52 that corresponds to each other is located on the guide rod 6, that is to say, guide rod 6 is presented in the guide rod fixed orifice 131 after passing guide rod sliding eye 121, first, second slide guide hole 42,52 successively.The perhaps phase mutual exclusion of closing up each other of first, second fixture block 4,5 is opened by 7 realizations of fixture block open-and-close mechanism.

The preferred construction of fixture block open-and-close mechanism 7 is following: revolve screw mandrel 71 about comprising, revolve 72, first bracket 73 and second bracket 74; About revolve screw mandrel 71 and match with aforesaid first, second feed screw nut 43,53; Revolve 72 for two handle knob revolve handle; Revolve the end towards first trailing arm 12 of screw mandrel 71 about being fixed on; The basal surface of first bracket 73 and first trailing arm 12 is fixed; Offer the recessed road 731 of one first semicircle at this first bracket 73 towards a side of the basal surface of first trailing arm 12 and in the position corresponding to the recessed road 122 of aforesaid second semicircle, an end (the being right-hand member shown in Figure 1) end of revolving screw mandrel 71 about treating is placed in 731,122 interior backs, the recessed road of first, second semicircle and with second screw 732 bottom surface of first bracket 73 and first trailing arm 12 is fixed; The basal surface of second bracket 74 and second trailing arm 13 is fixed; Offer the recessed road 741 of one the 3rd semicircle (Fig. 2 shows) at this second bracket 74 towards a side of the basal surface of second trailing arm 13 and in the position corresponding to the recessed road 132 of aforesaid the 4th semicircle, the other end (the being left end shown in Figure 1) end of revolving screw mandrel 71 about treating is placed in 741,132 interior backs, the recessed road of the 3rd, the 4th semicircle and with the 3rd screw 742 surface of second bracket 74 and second trailing arm 13 is fixed.When about to revolve screw thread that screw mandrel 71 matches with first feed screw nut 43 be left-handed during to screw thread, revolve screw thread that screw mandrel 71 matches with second feed screw nut 53 about then and be dextrorotation to screw thread, vice versa.So, when the operator with clockwise or turn counterclockwise revolve 72 the time, then make be bearing in rotationally on first, second bracket 73,74 about revolve screw mandrel 71 and do corresponding rotation, first, second fixture block 4,5 closed up each other or scold out mutually.

are asked for an interview Fig. 3 and are combined Fig. 1; The applicant describes the use of the utility model, and the bent axle 8 of motor car engine has been shown in Fig. 3, in the time will measuring the end play of (detection) bent axle 8; The utility model is fixing on the front end axle 81 of bent axle 8; Specifically be, take first, second v- shaped cavity 41,51 by the utility model device shown in Figure 1 and extend in the front end axle 81, make the gauge outfit 32 of dial gauge 3 touch main beating cap 82 end faces or the cylinder block side transverse plane of bent axle 8; And give pre compressed magnitude about 1 ㎜ (according to the length that leans out of front end axle 81; Regulate by dial gauge detent mechanism 2), then handle revolving of fixture block open-and-close mechanism 7 72, make first, second fixture block 4,5 aspectant towards each other direction displacements; Until on front end axle 81, reliably clamping; With bottle opener or crow bar or similar instrument forward and backward bent axle that prizes between the main bearing seat of bent axle 8 and crank arm, this moment, the table body 31 of dial gauge 3 produced axially-movables with bent axle 8 subsequently, and the rolling momentum indicating value that the pointer 312 (Fig. 1 shows) of the table body 31 of dial gauge 3 is produced is the end play value of bent axle 8.Because first, second v- shaped cavity 41,51 of the utility model has bigger range of movement, can be suitable for diameter is the preceding end-journal detection of 20-50 ㎜, and measurement range is wider.

In the description of the utility model scheme, though given an example, be not so limited the measurement of the end play of the bent axle 8 of motor car engine, for example can the utility model be applied to the measurement to the end play of other class assembly

Claims

1. a kind of bent axle end play pick-up unit is characterized in that comprising a portal (1) that constitutes door-shape cavity (11); One dial gauge detent mechanism (2), this dial gauge detent mechanism (2) are arranged on the top of said portal (1) and are positioned at the middle position of length direction at the top of portal (1) substantially; One dial gauge (3); This dial gauge (3) is fixed on the said dial gauge detent mechanism (2) with the horizontally-arranged state of level; Wherein: the table body (31) of this dial gauge (3) leans out a side at the top of portal (1), and the gauge outfit (32) of dial gauge (3) leans out the opposite side at portal (1) top; One first fixture block (4) and one second fixture block (5); This first, second fixture block (4,5) cooperation that faces each other; And be positioned at described door-shape cavity (11); Constitute one first v-shaped cavity (41) at first fixture block (4) towards a side of second fixture block (5), and constitute one second v-shaped cavity (51) towards a side of first fixture block (4) and in the position corresponding to said first v-shaped cavity (41) at second fixture block (5), first, second v-shaped cavity (41,51) is fitted to each other; One guide rod (6), this guide rod (6) are set on first trailing arm (12) and second trailing arm (13) of portal (1), and described first fixture block (4) and second fixture block (5) are placed on the middle part of the length direction of this guide rod (6) movably; One is used to order about the fixture block open-and-close mechanism (7) that said first, second fixture block (4,5) closes up each other or the phase mutual exclusion is opened; This fixture block open-and-close mechanism (7) is connected with second fixture block (5) with first fixture block (4), and is supported on rotationally on described first trailing arm (12) and second trailing arm (13).

2. bent axle end play pick-up unit according to claim 1; It is characterized in that described dial gauge detent mechanism (2) comprises first, second holder (21,22) and trip bolt (23); First holder (21) is fixed on the top of said portal (1) and is positioned at the middle position at the top of portal (1); Constitute one first semicircle groove (211) at this first holder (21) towards a side of second holder (22); Second holder (22) is formed on first holder (21); Constitute one second semicircle groove (221) towards a side of first holder (21) and in position at this second holder (22) corresponding to first semicircle groove (211); First, second semicircle groove (211,221) is fitted to each other and constitutes circular cavity, and trip bolt (23) revolves and fits over second holder (22) and go up and revolve and in first holder (21), the table body (31) of described dial gauge (3) is fixed between first, second holder (21,22).

3. bent axle end play pick-up unit according to claim 2; It is characterized in that described table body (31) has a table body fixed bar (311), this table body fixed bar (311) is corresponding in described first, second semicircle groove (211,221).

4. bent axle end play pick-up unit according to claim 1; It is characterized in that offering a guide rod sliding eye (121) on the top of described first trailing arm (12); And offering a guide rod fixed orifice (131) on the top of second trailing arm (13), this guide rod fixed orifice (131) is corresponding with guide rod sliding eye (121); Middle position on the top of described first fixture block (4) offers one first slide guide hole (42); And offer one second slide guide hole (52) in the middle position on the top of described second fixture block (5); First, second slide guide hole (42,52) corresponds to each other; And this first, second slide guide hole (42,52) is also corresponding with described guide rod sliding eye (121) and guide rod fixed orifice (131), and it is fixing with described guide rod fixed orifice (131) that described guide rod (6) passes guide rod sliding eye (121), first slide guide hole (42) and second slide guide hole (52) successively.

5. bent axle end play pick-up unit according to claim 4; It is characterized in that said guide rod (6) is provided with the qualification bead (61) of a diameter greater than the diameter of said guide rod sliding eye (121) towards the expansion of an end end of said first trailing arm (12), and be equipped with a snap ring (62) towards an end of said second trailing arm (13) and in the end that leans out said guide rod fixed orifice (131) at guide rod (6).

6. bent axle end play pick-up unit according to claim 1; It is characterized in that in the chamber wall of described first v-shaped cavity (41), being provided with one first protection pad (411), and in the chamber wall of described second v-shaped cavity (51), be provided with one second protection pad (511).

7. bent axle end play pick-up unit according to claim 6 is characterized in that described first protection pad (411) and described second protection pad (511) are rubber, nylon or on-woven fiber felt.

8. bent axle end play pick-up unit according to claim 1; The bottom that it is characterized in that described first fixture block (4) is provided with first feed screw nut (43); And the bottom of described second fixture block (5) is provided with second feed screw nut (53); First, second feed screw nut (43,53) corresponds to each other; Revolve screw mandrel (71) about described fixture block open-and-close mechanism (7) comprises, revolve (72), first bracket (73) and second bracket (74); About revolve screw mandrel (71) and revolve and be assigned on first feed screw nut (43) and second feed screw nut (53); Revolve and revolve (72) on the screw mandrel (71) about being fixed on, first bracket (73) corresponding to about revolve screw mandrel (71) an end the below and fix with the bottom of said first trailing arm (12), second bracket (74) corresponding to about revolve screw mandrel (71) the other end the below and fix with the bottom of said second trailing arm (13).

9. bent axle end play pick-up unit according to claim 1; It is characterized in that being concaved with the recessed road of one second semicircle (731) towards a side of said first trailing arm (12) at described first bracket (73); And being concaved with the recessed road of one second semicircle (122) in the bottom of first trailing arm (12) and in position corresponding to the recessed road of first semicircle (731), the recessed road of first, second semicircle (731,122) correspond to each other; Be concaved with the recessed road of one the 3rd semicircle (741) at described second bracket (74) towards a side of said second trailing arm (13); And being concaved with the recessed road of one the 4th semicircle (132) in the bottom of second trailing arm (13) and in position corresponding to the recessed road of the 3rd semicircle (741), the recessed road of the 3rd, the 4th semicircle (741,132) corresponds to each other.

10. Bent axle end play pick-up unit according to claim 1; It is characterized in that when match with said first feed screw nut (43) said about when revolving screw thread on the screw mandrel (71) and being left-hand thread (LHT), then match with said second feed screw nut (53) said about the screw thread that revolves on the screw mandrel (71) be right-hand thread; And when match with said first feed screw nut (43) said about when revolving screw thread on the screw mandrel (71) and being right-hand thread, then match with said second feed screw nut (53) said about the screw thread that revolves on the screw mandrel (71) be left-hand thread (LHT)