FR2646797A1 - APPARATUS FOR DISASSEMBLING AND MOUNTING VALVES AND FOR RECTIFIING VALVE SEATS - Google Patents

Abstract

It is a device of the type comprising a support receiving the cylinder head, and it is notably remarkable in that the cylinder head support is constituted by a clamping table carried by a support frame 1 on which said table is rotatably mounted on a generally horizontal direction axis, said clamping table being movable between two locking positions, an assembly-disassembly position in which the cylinder head has its upper face upwards, and a grinding position in which, by turning 180degre (s) , the cylinder head has its underside upwards with a view to grinding the valve seats, and in that the support frame 1 carries a grinding device as well as a valve assembly-disassembly device. The present invention relates to the overhaul of heat engines and makes it possible to carry out on one and the same work station the successive dismantling, grinding and reassembly operations without the cylinder head being removed from the apparatus.

Description

Apparatus for dismounting and mounting

  valves and for the grinding of valve seats ".

  The present invention relates to the reconditioning of the heat engines and, more particularly, to the grinding operation of the valve seats. These valves are arranged through the cylinder head of the engine, their head rests against a valve seat while their rod protrudes from the other side of the cylinder head so as to be pushed by the rocker arm against the action of the spring valve which is held on the support cup by means of a key engaging in a groove formed in the stem of

the valve.

  When it is necessary to carry out a grinding operation of the valve seats, it is necessary to disassemble the cylinder head, then to disassemble the valves before carrying out the grinding operation itself, these operations being followed of course.

  corresponding winding operations.

  At present, this operation is carried out on two work stations, a station in which the operations of disassembly or reassembly of the valve are carried out and a station in which the actual grinding work is carried out. To disassemble or reassemble, it is necessary that the cylinder head is with its upper face on top. It is necessary to carry out a compression operation of the spring to extract the key and one generally uses devices which are similar to clamps of which one of the bill bears on the head of the valve while the other, fork-shaped, comes to rest on the support cup of the spring. This first disassembly operation (or reassembly) is difficult because it monopolizes the two

  hands of the operator and requires a

relatively important.

264,679?

  Furthermore, to perform the grinding operation, it is necessary to turn the breech so as to have its lower face upwards, so that it is necessary to proceed to an operation not only transfer but reversal of the breech from the dismantling station to the

grinding and vice versa.

  The present invention aims to remedy these drawbacks, and it relates to an apparatus that allows to perform on a single workstation the successive operations of disassembly, rectification and reassembly without the breech is

disassembled-from the device.

  This apparatus is of the type comprising a support receiving the breech and it is particularly remarkable in that the support of the breech is

  constituted by a clamping table carried by a building

  support on which said table is rotatably mounted on an axis of general horizontal direction, said clamping table being movable between two lockable positions, a mounting-disassembling position in which the yoke has its top face up and a grinding position in which, by turning 180, the cylinder head has its underside upwards for rectifying the valve seats and in that said support frame carries a grinding device and a device for

assembly and disassembly of the valves.

  With this arrangement, the above three operations can be performed on the device, without manipulation of the cylinder head which is simply rotated 180 between the different operations. According to another characteristic of the invention, the device for mounting and dismounting of the valves consists of a valve head retaining arm and a spring compression piece, said retaining arm and said compression piece being arranged on either side of the clamping table and carried by a movable vertical support in

  horizontal and vertical translation in said building

  support, its vertical translation causing the vertical movement of the retaining arm and the compression piece between a rest position and a working position and being actuated by a control member.

control consisting of a pedal.

  In the working position, the retaining arm bears on the valve head and the compression piece is pressed against the cup so as to compress the spring and release the key. This operation is performed by a foot control, the removal of the key can be achieved very easily. Advantageously, the axis of rotation of the clamping table on the support frame can be eccentric in height relative to said table so that the working level is substantially the same in the two positions of assembly-disassembly and of

  grinding, taking into account the dimensions of the cylinder head.

  This allows to work substantially at the same

  height for the three successive operations.

  According to one embodiment of the invention, the compression piece is mounted on a horizontal arm of adjustable length, itself mounted on the vertical support formed of a vertical rod, with the possibility of height adjustment; the retaining arm is fixed hinged about a horizontal axis on the vertical rod, rests on a horizontal transverse bar and has at its end a support rod of the perpendicular valve heads

  arm audit and directed upwards.

  According to another characteristic of the invention, the clamping table consists of a tubular bar rotatably mounted on a horizontal crossmember of the support frame, two plates slidably fixed to said tubular bar near its ends and perpendicular to these, and on which is slidably attached at least one support block which is perpendicular to said corresponding plate and whose free end carries clamping fingers parallel to said plates; the support blocks of different height are slidably fixed on the corresponding plate by lights arranged on said plate and through which clamping screws pass; each clamping finger has a support end on the cylinder head and a longitudinal slot in which a clamping screw slides and abuts on a support screw of

adjusting the height of said finger.

  Thanks to this arrangement, it is easy to

  attach engine cylinder heads of different sizes.

  According to another characteristic of the invention, a locking device, blocking the

  clamping table in its two positions, mounting-

  disassembly and grinding, consists of at least one rod passing through the tubular bar and cooperating with holes arranged in the crosspiece and arranged symmetrically with respect to the axis; the crossmember has two upper and two lower holes and the two locking rods are each provided with a return spring and at their end a

grip button.

  According to yet another characteristic of the invention, the compression part consists of a clamp having two branches adjustable in spacing on a threaded rod with opposite pitch, the spacing of the branches being locked by a nut.

& ears.

  - The grinding device consists of a tool driven by an electric motor via a hose and has a rotating handle at its end close to the tool, the hose can rotate in this handle. According to an alternative embodiment, it consists of a tool driven by an electric motor via a transmission, a gearbox and a universal joint. According to other features of the invention, the clamping table comprises an adjustable tilting device; the crossbar is mounted on the support frame with horizontal and vertical translation; it is carried by two tubes each of which is slidably mounted in another tube rotatably mounted on the support frame and is locked in position by thumb screws; on each side of the support frame is provided a tilting device of the crossbar

  consisting of a system of connecting rods.

  Thanks to these latter characteristics, it is easy to adapt the position of the cylinder head according to its dimensions and possibly to

the pleasure of the manipulator.

  Other features and benefits of

  the invention will emerge from the description which follows,

  by way of non-limiting illustration with reference to the accompanying drawings in which: - Figure 1 is a general perspective view of the apparatus; - Figure 2 is a partial perspective view and side of the apparatus; in position of

assembly-disassembly, -

  FIG. 3 is a view similar to that of FIG. 2 but in a grinding position; FIG. 4 is a partial view showing the compression of a valve spring; FIG. 5 is a top view of the table; in FIG. 6 is a partial perspective and front view of the apparatus in the grinding position, and FIG. 7 is a partial view in FIG.

  perspective and from behind the camera.

  FIG. 8 is a general perspective view of the apparatus, showing a variant of

  realization of the grinding device.

  The apparatus shown in FIG. 1 in particular comprises a support frame 1 consisting of a frame 2 resting on the ground and supporting two vertical uprights 3 held by a top rail.

  4. In accordance with the invention, this building

  support is provided with a valve seat grinding device consisting of a bur 5 driven by an electric motor 6 via a hose 7, as seen in particular in Figure 6. Advantageously, this device of grinding comprises a rotary handle 8 at its end adjacent to the cutter 5, the flexible rotating in the handle 8. According to an alternative embodiment shown in Figure 8, the grinding device is driven by an electric motor connected by a transmission 71 to a reducer q72; the latter supports the tool holder or the cutter, via a universal joint 73, 74; between these two gimbals, a tube 75 surrounds a hexagonal rod retained by a key. On the other hand, the grinding device is provided with a device

brake 76.

  The support frame 1 also comprises a valve assembly / disassembly device consisting essentially of a vertical cylindrical rod 11 which is mounted on the support frame 1 so as to be displaced in horizontal translation parallel to the crosspiece 4; as shown in FIG. 6, this translation is obtained by means of a support member 12 which is slidably mounted on a horizontal cylindrical axis 13 secured to the frame 1. This vertical rod supports on the one hand an arm 14 of retaining the valve heads and a spring compression part of the valve. The compression part 15, see FIG. 2, is substantially vertical and mounted on a horizontal arm 16 of adjustable length which is fixed to rotate around the rod 11; the height of this arm 16 and, consequently, of the compression part 15 is discreetly adjustable by means of holes 17 formed in the rod 11. A screw 18 allows fine adjustment of the

  height of the compression part 15.

  The retaining arm 14, Figure 1, is hinged about a horizontal axis 19 on the rod 11 and rests on a horizontal transverse bar 21; this retaining arm 14 has at its end a support rod 22 perpendicular to the arm 14 and directed upwards; the height of this support rod 22 by

  relative to the bar 14 is adjusted by means of a screw 23.

  As indicated above, the rod 11 is mounted to slide vertically in its support 12 and this vertical translation is controlled by means of a pedal 24 whose end is fixed on a vertical rod 26 and which is connected to the rod 11 by

via a cable 25.

  As can be seen in particular in Figure 7, the vertical rod 26 above is secured to a part 27 secured to the support 12 of the rod 11; it follows that the assembly-disassembly device is integral with the part 27 which constitutes a kind of carriage which is mounted to slide horizontally on

  two cylindrical horizontal rods 13 and 13 '.

  The apparatus according to the invention comprises a clamping table for fixing the cylinder heads and which is rotatably mounted on a substantially horizontal axis. As can be seen in particular in Figures 2 and 3, the clamping table consists of a horizontal tubular bar of square section 31 which is fixed to rotate on a horizontal cross member 32 secured to the frame, the rotation being effected around an axis 33 which is substantially central on the crossbar 32 but which is offset in height relative to the tubular bar 31 (see Figure 2 and 5); two plates 34 and 35 which are substantially horizontal are fixed perpendicularly to the tubular bar 31; as can be seen in particular in Figures 2, 5 and 6, the plates 34 and 35 are slidably mounted on the bar 31 and are fixed in position by means of a nut or butterfly 36; the two plates 34 and 35 are disposed on either side of the axis of rotation 33 at the ends of the bar

tubular 31.

  Plate 34 or 35 carries at least one block

  support perpendicular to its surface and adjustable in position. In the example shown, each plate comprises two support blocks of different height, a large support block 37 and a small support block 38; these two support blocks are mounted to slide transversely on the plate 34 or 35 which comprises for this purpose lights 39 and 41 through which

pass tightening screws 42.

  Each support block supports at its free end a clamping finger 43 which, in the example shown, has at one of its ends a small round rod 44 which is intended to come into contact with the edge of the bolt and a g longitudinal lumen in which slides a clamping screw (Figure 5); as can be seen in particular in Figures 2 and 5, each support block has at its free end two screws, namely the clamping screw 45 above and a support screw 46 which adjusts the height of the finger 43 according to the dimensions of the cylinder head to be locked so that the finger is substantially horizontal in the position of

Tightening.

  As indicated above, the assembly of this clamping table is rotatably mounted about the axis 33 which is eccentric in height and the clamping table can take two positions obtained by turning 180 about the axis 33. a first position which is shown in particular in Figures 2 and, the clamping table and therefore the yoke 47 are in the lower position, the cylinder head having its upper face 48 with the upwardly projecting valve tails; this position corresponds to the position of assembly-disassembly of the valves. In a second position, shown in particular in Figures 3 and 6, the entire clamping table and the yoke 47 are in the upper position, the yoke 47 having its lower face 49 with the seats of

valve 51 upwards.

  According to the invention there is provided a locking device of the clamping table in the two aforementioned positions; in the example shown, as shown in particular in Figures 1 and 2, the locking device is constituted by a rod 52 through the tubular bar 31 and cooperating with holes in the crosspiece 32 and arranged symmetrically with respect to the axis 33; two upper holes 53 serve for locking in the high rectifying position and the two lower holes 54 serve for locking in the lower position of assembly-disassembly. The locking rod 52 is provided at its end with a kind of button 55 which facilitates gripping and a spring 56 disposed on the locking rod 52 inside the tubular bar 31 and cooperating with a stop 57 disposed on the locking rod 52 maintains the rod in the locking position that is to say in the holes 53 or 54, while a locking cam ensures the maintenance of the rod 52 in the retracted position during the unlocking and

  the flipping of the clamping table.

  According to the invention, the position of the clamping table can be adjusted in translation

  horizontal with respect to the frame 1 and inclination.

  In the exemplary embodiment shown, as can be seen in particular in Figures 2 and 3, the cross member 32 on which is fixed the entire clamping table is carried by two tubes 58 which are each slidably mounted in another tube 59 mounted on the frame, the inner tubes 58 being locked in the outer tubes 59 by means of thumb screws; in the example shown, as can be seen in particular in Figure 2, the inner tube 58 is of circular section and the outer tube 59

is of square section.

  As can be seen in Figures 1 and 2, there is provided on each side of the frame 1, a tilting device consisting of two rods 61 and 62 hinged to one another; the free end of the first connecting rod 61 is hingedly mounted on the crossmember 32 and the other connecting rod 62 is fixed to rotate about a horizontal axis 63 on the frame 1. Furthermore, the outer tube 59 supporting the cross member 32 through the inner tube 58 is, in fact, also rotatably mounted on the frame 1 about the horizontal axis 63; the tube 59 has for this purpose a tab 64 articulated on the axis 63, and the pivoting of the tube 59 is achieved through a system of

connecting rods 65, 66.

  Finally, as can be seen in particular in Figures 1, 2 and 7, two threaded rods 67 having a crank 68 are provided on each side of the frame 1 at its upper part to adjust the horizontality of the crosspiece 32. These rods threaded 67 cooperate with parts 69 guided in a vertical groove in the support frame 1, and solidarity

  the upper part of the frame, adjustable in height.

  The operating mode of the device is

  now be described more precisely.

  The yoke is therefore put in place by placing its two ends on the plates 34 and 35; on each plate 34 or 35, one of the two support blocks is displaced by transverse sliding on the plate thanks to the lights 39 and 41 provided therein; then the clamping finger 43 is adjusted on the upper face 48 of the yoke with the aid of the support screw 46 and is locked in position by screwing the clamping screw 45. Two support blocks are provided: a large support block 37 and a small block support 38; thus yokes of different thickness can easily be fixed. When the yoke 47 is thus fixed on the clamping table, it acts on the valve disassembly device (Figures 2 and 5). As described above, this device comprises a compression part 15 mounted on the horizontal arm 16. This compression part 15 comprises a disassembly clamp, consisting of two branches adjustable in spacing 15 'on a threaded rod with opposite pitch, the spacing of the branches being locked by a wing nut. Thus the clamp can adapt to different spring diameters depending on the type of

motor cylinder head to be machined.

  The operator therefore presses on the pedal, and as described above, the rod 11 is translated vertically; the downward movement of the rod 11 causes the upward tilting of the retaining arm 14, since the latter rests on the horizontal bar 21; simultaneously, the valve disassembly O10 clamp, which has been positioned facing the spring 71 of a valve considered, descends, compresses the spring 71 by pressing on its support cup 72 and thus releases the key 73 which is constituted two half-shells and held the valve in place (Figure 4); after removal of this key 73, the spring 71 can be removed and the valve extracted. The holding arm 14 has the effect that, during the action of the clamp 15 on the springs, the head of the valve is maintained applied to its seat. The positioning of the clamp 15 on the spring of each valve is achieved firstly by displacement of the rod 11 and secondly by changing the length of the horizontal arm 16 telescopic, the position of the latter being

  locked by a wing nut.

  When all the valves have been extracted, it releases the action on the pedal 24 which is biased upwards by a return spring and thus the retaining arm 14 and the compression clamp 15 are released. The latter is then neutralized by pivoting to clear the clamping table, in order to proceed with its reversal of 180. To do this, the two grip knobs 55 are pulled in order to disengage the rods 52 from the lower holes 54 arranged in the crosspiece 32. These rods 52 being locked in the retracted position, the clamping table 180 is pivoted so as to bring the lower surface 49 carrying the valve seats 51 upwards facing the operator. The clamping table is locked in this position by locking the rods 52 in the upper holes 53 of the cross member 32 (Figure 3). The operator can then perform the grinding operation using the grinding device

described above (Figure 6).

  It goes without saying that once the grinding is done, the valves are rolled up

  from the clamping table to the lower mounting position-

  disassembly and control of the pedal 24, by which the operator resets the valves with the support arm 14 of the valve heads and

  the compression clamp 15 of the spring.

  It goes without saying that, before these operations, the position at the clamping table can be set in horizontal and vertical translation with respect to the

chassis 1 and tilt.

Claims (11)

CLAIMS.   1) Apparatus for dismounting and mounting valves and for grinding the valve seats on a motor cylinder head having a support receiving the cylinder head, characterized in that the support of the cylinder head is constituted by a clamping table carried by a support frame (1) on which said table is rotatably mounted on a horizontal axis of general direction, said clamping table being movable between   two lockable positions, a mounting position-   disassembly in which the yoke (47) has its upper face (48) upwards and a grinding position in which, by turning 180, the yoke (47) has its lower face (49) upwards for rectification valve seats (51) and in that said supporting frame (1) carries a grinding device and an assembly-disassembly device valves.   2) Apparatus according to claim 1,   characterized in that the mounting device   disassembly of the valves comprises a retaining arm (14) of the valve head and a compression member (15) of the spring, said retaining arm (14) and said compression member (15) being disposed of both sides of the clamping table and carried by a vertical support (11) movable in horizontal and vertical translation in said support frame (1), its vertical translation causing the vertical displacement of the retaining arm (14) and the compression piece (15) between a resting position and a working position, and being actuated by a member   control unit consisting of a pedal (24).   3) Apparatus according to claim 2, characterized in that the compression member (15) is mounted on a horizontal arm (16) adjustable length itself mounted on the vertical support (11) formed of a   vertical stem, with possibility of height adjustment.   4) Apparatus according to claim 2 or 3, characterized in that the retaining arm (14) is hinged about a horizontal axis (19) on the vertical rod (11), rests on a horizontal transverse bar (21). ) and has at its end a support rod (22) perpendicular to the valve heads   said arm (14) and directed upwards.   ) Apparatus according to any one of   preceding claims, characterized in that the   clamping table consists of a tubular bar (31) rotatably mounted on a horizontal crossbar (32) of the support frame (1), two plates (34, 35) slidably attached to said tubular bar (31) at adjacent its ends and perpendicular thereto, and on which is slidably attached at least one support block (37, 38) which is perpendicular to said corresponding plate and whose free end carries parallel clamping fingers 43 said plates.   6) Apparatus according to claim 5, characterized in that the blocksupports different height (37, 38) are slidably fixed on the plate (34, 35) corresponding to lights (39, 41) provided on said plate (34, 35). or 35) and   through which tightening screws (42) pass.   7) Apparatus according to claim 6, characterized in that each clamping finger (43) has a bearing end (44) on the yoke (47) and a longitudinal lumen in which slides a clamping screw (45) and comes resting on a screw   support (46) for adjusting the height of said finger.   8) Apparatus according to any one of   Claims 5 to 7, characterized in that   locking device, blocking the clamping table in its two positions, assembly-disassembly and grinding, consists of at least one rod (52) passing through the tubular bar (31) and cooperating with holes formed in the cross-member ( 32) and arranged symmetrically with respect to the axis (33). 9) Apparatus according to claim 8, characterized in that the crossbar (32) has two upper holes (53) and two lower holes (54) and in that the two locking rods (52) are each provided with a spring (56) and to their   end of a button (55) gripping.   ) Apparatus according to any one of   Claims 2 to 9, characterized in that the coin   compression (15) consists of a clamp comprising two branches (15 ') adjustable in spacing on a threaded rod with opposite pitch, the spacing of the branches   being locked by a wing nut.   11) Apparatus according to any one of   preceding claims, characterized in that the   grinding device consists of a tool (5) driven by an electric motor (6) via a hose (7) and comprises a rotary handle (8) at its end adjacent to the cutter (5), the hose (7) being rotatable in this handle (8).   12) Apparatus according to any one of   Claims 1 to 10, characterized in that the   grinding device is constituted by a tool driven by an electric motor via a transmission (71), a gearbox (72) and a cardan joint (73, 74).   13) Apparatus according to any one of   preceding claims, characterized in that the   clamping table has a tilting device adjustable.   14) Apparatus according to any one of   preceding claims, characterized in that the   crossbar (32) is mounted on the support frame (1) in horizontal and vertical translation. Apparatus according to claim 14, characterized in that the cross member (32) is carried by two tubes (58), each of which is slidably mounted in another tube (59) rotatably mounted on the support frame (1) and is blocked in position by thumb screws.   16) .The apparatus of claim 15, characterized in that on each side of the support frame (1) is provided a device for inclining the crossbar (32) consisting of a connecting rod system (61, 62). .