CN203636112U

CN203636112U - Camshaft hobbing tool

Info

Publication number: CN203636112U
Application number: CN201320755061.XU
Authority: CN
Inventors: 何根浩
Original assignee: CHONGQING JINQIAO MACHINE MANUFACTURING CO LTD
Current assignee: CHONGQING JINQIAO MACHINE MANUFACTURING CO LTD
Priority date: 2013-11-26
Filing date: 2013-11-26
Publication date: 2014-06-11
Anticipated expiration: 2023-11-26

Abstract

The utility model discloses a camshaft hobbing tool, which includes a first base, a second base, a rotary air cylinder, a drive gear, a seal ring, a driven gear, screw rods, a tip positioning base, a lower tip, an angle positioning sleeve, an end surface positioning plate, telescopic jacking pillars, friction plates, compression springs, steel balls, positioning pins and fixing pins, wherein two rotary air flow passages are arranged on the first base and the seal ring, and are communicated with second vent holes in the second base; the compression springs and the steel balls are mounted in axial blind holes of the screws, and form a differential gear with counter bores in the friction plates. The camshaft hobbing tool can be automatically adjusted through the differential gear so as to pre-tighten workpieces, and influence on clamping precision caused by processing error on the end surface is avoided; the processing manner that when the camshaft hobbing is processed, a workpiece is rotated and a cutter is fixed is creatively realized.

Description

Gear hobbing of cam shaft frock

Technical field

The utility model relates to a kind of machining frock, is specifically related to a kind of gear hobbing of cam shaft tool structure.

Background technology

Existing gear hobbing of cam shaft is all to carry out on gear-hobbing machine, is all conventionally that workpiece is motionless, hobboing cutter rotates, and due to the end face out-of-flatness of camshaft itself, the low situation of gear hobbing of cam shaft ubiquity machining accuracy after processing, has had a strong impact on the quality of product.

Utility model content

The purpose of this utility model is to provide the gear hobbing of cam shaft frock that a kind of hobboing cutter is motionless, workpiece rotates, and machining accuracy significantly improves.

For this reason, a kind of gear hobbing of cam shaft frock that the utility model provides, comprise the first base (1), the second base (2), rotary cylinder (3), driving gear (4), top positioning seat (8), lower top (9), angle orientation cover (10) and end face positioning disk (11), and all coaxially arrange, described the first base (1) is positioned at the below of the second base (2), and the first base (1) is fixed together by screw with the second base (2), the bottom of the first base (1) circumferentially stretches out and forms mounting disc (1a), be set with sealing ring (5) on the top of the first base (1), on the outer wall of described sealing ring (5), be provided with anti-rotation gear shifting block (5b),

On the outer wall of described the first base (1), be provided with two between the upper and lower every first, the second cannelure (1b, 1d) He two " L " shape connecting holes (1c), on the sidewall of sealing ring (5), have four the first passages (5a), wherein two the first passages (5a) are positioned on same circumference and just to the first cannelure (1b), two other first passage (5a) is also positioned on same circumference and just to the second cannelure (1d), on the second base (2), have two radial blind holes (2a), two radial blind holes (2a) are communicated with each self-corresponding " L " shape connecting hole (1c) respectively, on the sidewall of described the second base (2), have two the second passages (2b),

Described rotary cylinder (3) is arranged in the inner chamber of the second base (2), and insert in the centre bore of driving gear (4) upper end of rotary cylinder (3), insert in the centre bore of the first base (1) lower end of rotary cylinder (3), be evenly equipped with at least three driven gears (6) that engage with driving gear (4) in the periphery of driving gear (4), each driven gear (6) is sleeved on the lower end of corresponding screw rod (7), insert in the through hole arranging in top positioning seat (8) upper end of screw rod (7), and screw rod (7) is threaded with described through hole, expanding support pillar (12) is also installed in described through hole, the lower end of expanding support pillar (12) is supported by screw rod (7), described lower top (9) are fixed by screws on top positioning seat (8), described angle orientation cover (10) is sleeved on lower top (9), alignment pin (16) is housed in angle orientation cover (10), described end face positioning disk (11) is sleeved on angle orientation cover (10), and the lower surface of end face positioning disk (1) is pressed on top positioning seat (8), on the middle part axle journal of described screw rod (7), have the axial blind hole (7a) of upper end closed, between the middle part axle journal of screw rod (7) and driven gear (6), frictional disk (13) is housed, and frictional disk (13) is locked together by steady pin (17) with corresponding driven gear (6), on frictional disk (13), have the counterbore (13a) corresponding with axial blind hole (7a) position, Compress Spring (14) and steel ball (15) are housed in described axial blind hole (7a), and the lower end of steel ball (15) is pressed on counterbore (13a).

Be preferably, between described the first cannelure (1b) and the second cannelure (1d), the upper end of the top of the first cannelure (1b), the below of the second cannelure (1d), " L " shape connecting hole (1c) is provided with O type circle (18), to improve the sealing of frock.

Operation principle:

(1) gas enters by the first passage on sealing ring, the radial blind holes entering again on the second base through the first cannelure on the first base, " L " shape connecting hole successively picks out, the second passage access rotary cylinder on the second base again, rotary cylinder can do suitable, counterclockwise reciprocating rotary, drive driving gear to rotate by rotary cylinder, driving gear drives driven gear to rotate together with frictional disk.Driven gear is sleeved on screw rod, by driven gear suitable, be rotated counterclockwise and drive the rotation of screw rod, then promote expanding support pillar by screw rod and move up and down, realize the pretension of workpiece with this;

(2) on the middle part axle journal of screw rod, have the axial blind hole of upper end closed, on frictional disk, have the counterbore corresponding with axial blind hole position, Compress Spring and steel ball are housed in axial blind hole, and the lower end of steel ball is pressed on counterbore, form differential gear, guarantee that with this every expanding support pillar can contact the end face of camshaft, thereby eliminate the poor impact on harness precision of end face run-out; The operation principle of differential gear is: in the time that camshaft end face exists irregular phenomenon, first the minimum point of end face contacts with expanding support pillar, thereby make to occur skidding between frictional disk and screw rod, driven gear and frictional disk rotate, screw rod stops the rotation, and all the other expanding support pillars that do not contact camshaft end face continue to be moved up by screw rod drive, in the time that all camshaft end faces all contact with corresponding expanding support pillar, all screw rods all stop the rotation;

(3) owing to being threaded connection between screw rod and top positioning seat, can effectively reduce the vibrations in the course of work, the two ends up and down of camshaft are respectively by top location, and positioning precision is high.

The beneficial effects of the utility model are: this frock is adjusted to realize workpiece pretension automatically by differential gear, prevent from affecting clamping precision because of end face mismachining tolerance, and the creationary gear hobbing of cam shaft of having realized adds man-hour, workpiece rotation, the fixing processing mode of cutter, and positioning precision is high, good product quality.

Accompanying drawing explanation

Fig. 1 is front view of the present utility model (comprising camshaft and upper top).

Fig. 2 is the A-A cutaway view of Fig. 1.

The specific embodiment

Below in conjunction with drawings and Examples, the utility model is described in further detail:

In conjunction with Fig. 1---shown in Fig. 2, a kind of gear hobbing of cam shaft frock, is made up of the first base 1, the second base 2, rotary cylinder 3, driving gear 4, sealing ring 5, six driven gears 6, six screw rods 7, top positioning seat 8, lower top 9, angle orientation cover 10, end face positioning disk 11, six expanding support pillars 12, six frictional disks 13, six Compress Springs 14, six steel balls 15, alignment pin 16, six steady pins 17 and some screws.

The first base 1, the second base 2, rotary cylinder 3, driving gear 4, top positioning seat 8, lower top 9, angle orientation cover 10 and end face positioning disk 11, coaxially arrange.The first base 1 is positioned at the below of the second base 2, and the first base 1 and the second base 2 are fixed together by screw, the bottom of the first base 1 circumferentially stretches out and forms mounting disc 1a, mounting disc 1a is for being installed to workbench by whole frock, and the first base 1 rotates with workbench with the second base 2.Be set with sealing ring 5 on the top of the first base 1, on the outer wall of sealing ring 5, be provided with anti-rotation gear shifting block 5b and fix, keep off the rotation of shifting block 5b restriction sealing ring 5 by anti-rotation, so sealing ring 5 does not rotate with workbench.

On the outer wall of the first base 1, be provided with two between the upper and lower every first,

second cannelure

1b, 1d and two " L " shape connecting hole 1c, one of them " L " shape connecting hole 1c is communicated with the first cannelure 1b, and another " L " shape connecting hole 1c is communicated with the second cannelure 1d.On the sidewall of sealing ring 5, have four the first passage 5a, wherein two the first passage 5a are positioned on same circumference and just to the first cannelure 1b, and two other first passage 5a is also positioned on same circumference and just to the second cannelure 1d.Because sealing ring 5 does not rotate with the first base 1, the second base 2, therefore first,

second cannelure

1b, 1d are set on the first base 1 and are communicated with corresponding " L " shape connecting hole 1c to guarantee the first passage 5a.

On the second base 2, have two radial blind holes 2a, two radial blind holes 2a are communicated with each self-corresponding " L " shape connecting hole 1c respectively, have two the second passage 2b on the sidewall of the second base 2.Be positioned at two the first passage 5a of same circumference, form a revolution gas channel with a first cannelure 1b, " L " shape connecting hole 1c, a radial blind holes 2a, the first passage 5a, a second cannelure 1d, " L " shape connecting hole 1c, a radial blind holes 2a form another revolution gas channel; Two revolution gas channels, alternately as air inlet rotating channel and the rotating channel of giving vent to anger.Two revolution gas channels are communicated with one of them second passage 2b by a plastic flexible pipe respectively, thereby as the air inlet/outlet of rotary cylinder.Revolution gas channel is set, and is mainly during for fear of worktable rotary, and plastic flexible pipe is wrapped on the second base 2.

Rotary cylinder 3 is arranged in the inner chamber of the second base 2, and insert in the centre bore of driving gear 4 upper end of rotary cylinder 3, insert in the centre bore of the first base 1 lower end of rotary cylinder 3, drives driving gear 4 to rotate by rotary cylinder 3, and driving gear 4 is installed fixing by bearing 19.Be evenly equipped with six driven gears 6 that engage with driving gear 4 in the periphery of driving gear 4, each driven gear 6 is sleeved on the lower end of corresponding screw rod 7, gapped between driven gear 6 and screw rod 7.Insert in the through hole of top positioning seat 8 interior settings the upper end of screw rod 7, and screw rod 7 is threaded with through hole, expanding support pillar 12 is also installed in through hole, the lower end of expanding support pillar 12 is supported by screw rod 7, screw rod 7 moves up and down when rotation, moves up and down thereby promote expanding support pillar 12.Lower top 9 are fixed by screws on top positioning seat 8, and angle orientation cover 10 is sleeved on lower top 9, in angle orientation cover 10, alignment pin 16 are housed, and insert in the locating hole of camshaft 20 correspondences the termination of alignment pin 16, has realized the angle orientation of camshaft 20.The upper end of camshaft 20 also establish directly have on top 21(do not belong to the part of frock), camshaft 20 is by upper top 21 and lower top 9 location.End face positioning disk 11 is sleeved on angle orientation cover 10, and the lower surface of end face positioning disk 1 is pressed on top positioning seat 8, and expanding support pillar 12 promotes end face positioning disk and moves up, thereby realizes end face pretension.

On the middle part axle journal of each screw rod 7, have the axial blind hole 7a of upper end closed, between the middle part of screw rod 7 axle journal and driven gear 6, frictional disk 13 is housed, and frictional disk 13 is locked together by steady pin 17 with corresponding driven gear 6, on frictional disk 13, have the counterbore 13a corresponding with axial blind hole 7a position, Compress Spring 14 and steel ball 15 are housed in axial blind hole 7a, and the lower end of steel ball 15 is pressed on counterbore 13a.

In addition,, between the first cannelure 1b and the second cannelure 1d, the top of the first cannelure 1b, the below of the second cannelure 1d are provided with O type circle 18.

The quantity of driven gear 6, screw rod 7, expanding support pillar 12, frictional disk 13, Compress Spring 14, steel ball 15, steady pin 17 equates, is not limited to six, but is at least three, to guarantee the pretension of camshaft end face.

Claims

1. a gear hobbing of cam shaft frock, it is characterized in that: comprise the first base (1), the second base (2), rotary cylinder (3), driving gear (4), top positioning seat (8), lower top (9), angle orientation cover (10) and end face positioning disk (11), and all coaxially arrange, described the first base (1) is positioned at the below of the second base (2), and the first base (1) is fixed together by screw with the second base (2), the bottom of the first base (1) circumferentially stretches out and forms mounting disc (1a), be set with sealing ring (5) on the top of the first base (1), on the outer wall of described sealing ring (5), be provided with anti-rotation gear shifting block (5b),

2. according to gear hobbing of cam shaft frock claimed in claim 1, it is characterized in that: between described the first cannelure (1b) and the second cannelure (1d), the upper end of the top of the first cannelure (1b), the below of the second cannelure (1d), " L " shape connecting hole (1c) is provided with O type circle (18).