CN2409018Y

CN2409018Y - Hydraulic drawing machine for bolt of cylinder head

Info

Publication number: CN2409018Y
Application number: CN 00210750
Authority: CN
Inventors: 朱春瀛; 张伯荣; 张亚军
Original assignee: CNR Dalian Locomotive and Rolling Stock Co Ltd
Current assignee: CRRC Dalian Co Ltd
Priority date: 2000-01-27
Filing date: 2000-01-27
Publication date: 2000-12-06
Anticipated expiration: 2010-01-27

Abstract

The utility model relates to a bolt hydraulic stretcher which is particularly suitable for the assembly of cylinder covers of diesel engines and comprises a cylinder body (7) and a piston (8). sealing rings (9), (10) are installed between the cylinder body and the piston, and a scallop-shaped groove (5) and an oil inlet hole (15) are arranged on the side wall of the cylinder body. The utility model is characterized in that a stretching screw nut (3) is installed in a piston hole, the center of which is provided with a hole (12) with six sides and a threaded hole (2); a pulling sleeve (1) is installed between the stretching screw nut and a cylinder body hole; a spring (6) is installed in a hole between the upper end face of the pulling sleeve and the lower end face of the piston (8); the upper end of the cylinder body (7) is provided with a supporting frame (13) with a magnet; a measuring rod (4) and a measuring instrument (14) on the measuring rod (4) are installed in central holes of the supporting frame and the stretching screw nut (3); the lower end of the pulling sleeve (1) is provided with a tooth (16) matched with a groove on a clamp nut; The utility model has the advantages of simple structure and low cost.

Description

The cylinder head bolt hydraulic elongator

The utility model relates to a kind of cylinder head bolt hydraulic elongator, is particularly useful for when the assembling cylinder cover for diesel engine, to the prestretched of cylinder head bolt.

In assembling during diesel engine, use bolt to fix cylinder head on the diesel engine, before the nut on this bolt is tightened, tighten the nut on it after bolt need being stretched in advance usually again.Existing this class bolt tension device because unreasonable on the structure, therefore can not satisfy some special requirements of cylinder cover for diesel engine assembling fully at present.For example, a kind of cylinder head bolt stretching device that U.S. hydraulic technique company produces, stretching nut shape wherein is similar to common cover bucket spanner, its lower end head diameter is greater than the internal diameter of cylinder body upper end, therefore cylinder body and stretching nut wherein all can only be designed to the split type of structure relative complex, dress, tear open very inconveniently, also increased simultaneously the manufacturing cost of this stretching device.

The cylinder head bolt hydraulic elongator that the utility model relates to, its purpose will be simplified its structure exactly, reduces its manufacturing cost.

The cylinder head bolt hydraulic elongator that the utility model relates to comprises: cylinder body and the piston that is installed in this cylinder body, the sealing ring that adapts with the outside piston cylinder is housed respectively on the sidewall in the stepped hole of the described cylinder body first half, on the sidewall of described cylinder body Lower Half, have fan groove along its cross-sectional distribution, on cylinder body, have fuel feed hole, be characterized in: the stretching nut is housed in the hole of piston, the first half at this nut center has polygon hole, the screwed hole that its Lower Half has and the screw thread of the bolt that is stretched adapts, between the hole of the cylindrical of stretching nut and cylinder body, be equipped with and pull out cover, in this pulls out the hole that puts between end face and the piston lower surface, spring is housed, the support that covers on the stretching nut is housed in the upper surface of cylinder body, in the centre bore of this support and stretching nut, measuring stick is housed and is pressed against the measuring instrument on this measuring stick top, stud with magnet on support and the belt end face that the cylinder body upper surface contacts, the lower end of pulling out cover is provided with the tooth that the groove on the clamp nut of using with the fixed air cylinder cap matches.

The cylinder head bolt hydraulic elongator that the utility model relates to stretching nut and cylinder body wherein, by the original split type monoblock type that changes into, simplifies the structure respectively, make dress, tear open conveniently, also can reduce its manufacturing cost simultaneously.

Fig. 1 is the installation diagram of the cylinder head bolt hydraulic elongator that relates to of the utility model;

Fig. 2 is the zoomed-in view in A-A cross section among Fig. 1;

Now details are as follows to the embodiment of the related cylinder head bolt hydraulic elongator of the utility model in conjunction with the accompanying drawings:

As depicted in figs. 1 and 2, the cylinder head bolt hydraulic elongator that the utility model relates to comprises: cylinder body 7 and the piston 8 that is installed in this cylinder body, the sealing ring 9 and 10 that adapts with the outside piston cylinder is housed respectively on the sidewall in the stepped hole of the described cylinder body first half, on the sidewall of described cylinder body Lower Half, have fan groove 5 along its cross-sectional distribution, on cylinder body, have fuel feed hole 15, be characterized in: stretching nut 3 is housed in the hole of piston 8, the first half at this nut center has polygon hole 12, the screwed hole 2 that its Lower Half has and the screw thread of the bolt that is stretched adapts, between the hole of the cylindrical of stretching nut 3 and cylinder body 7, be equipped with and pull out cover 1, in this pulls out the hole that puts between end face and piston 8 lower surfaces, spring 6 is housed, in the upper surface of cylinder body 7 support 13 that covers on the stretching nut 3 is housed, measuring stick 4 is housed in the centre bore of this support and stretching nut 3 and is pressed against the measuring instrument 14 on this measuring stick top.Stud with magnet 11 on support 13 and the belt end face that cylinder body 7 upper surfaces contact, the lower end of pulling out cover 1 is provided with the tooth 16 that the groove on the clamp nut of using with the fixed air cylinder cap matches.

During the assembling cylinder head, stretching nut in the hydraulic elongator is screwed to the cylinder head bolt head of preparing stretching with hexagon, make the threaded engagement of the screwed hole and the bolt of this stretching nut, then measuring stick is put into the centre bore of stretching nut, the cover upper bracket also inserts measuring instrument, injection pressure oil in cylinder body again, under the effect of pressure oil, move on the relative cylinder body of piston, piston drove on the stretching nut and moved this moment, after will upwards elongating measured value with the bolt of its engagement simultaneously, be inserted in the circumferential hole of dial sleeve by the fan groove on the cylinder body with driving lever again, clamp nut locked by the tooth of this dial sleeve lower end.

Claims

1 one kinds of cylinder head bolt hydraulic elongators, comprise cylinder body (7) and be installed in the interior piston (8) of this cylinder body, the sealing ring (9) and (10) that adapt with the outside piston cylinder are housed respectively on the sidewall in the stepped hole of the described cylinder body first half, on the sidewall of described cylinder body Lower Half, have fan groove (5) along its cross-sectional distribution, on cylinder body, have fuel feed hole (15), it is characterized in that: stretching nut (3) is housed in the hole of piston (8), the first half at this nut center has polygon hole (12), the screwed hole (2) that its Lower Half has and the screw thread of the bolt that is stretched adapts, between the hole of the cylindrical of stretching nut (3) and cylinder body (7), be equipped with and pull out cover (1), in this pulls out the hole that puts between end face and piston (8) lower surface, spring (6) is housed, in the upper surface of cylinder body (7) support (13) that covers on the stretching nut (3) is housed, measuring stick (4) is housed in the centre bore of this support and stretching nut (3) and is pressed against the measuring instrument (14) on this measuring stick top.

2 cylinder head bolt hydraulic elongators according to claim 1, it is characterized in that: stud with magnet (11) on support (13) and the belt end face that cylinder body (7) upper surface contacts, the lower end of pulling out cover (1) is provided with the tooth (16) that the groove on the clamp nut of using with the fixed air cylinder cap matches.