JPS6031602B2 - Chuck grease supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grease supply coupling device for a chuck.

Conventional grease supply devices of this type require grease lubrication because they simply fill grease holes formed in the chuck body or chuck jaws with grease from a grease nipple. The supply of grease to the lubricating surface tends to be uncertain, and sometimes there is a problem of increased wear due to lack of grease. Also, the grease in the grease hole runs out in a very short period of time, making it difficult to replenish the grease hole right now. Therefore, there was a problem in that it caused a decrease in work efficiency.

In particular, as the rotational speed of the chuck increases recently, the grease on each sliding surface is blown out of the chuck by the far zero force, increasing the amount of grease consumed per unit time, and increasing the grease replenishment interval. There were problems such as having to keep the length of time extremely short. Therefore, the present invention aims to solve the above-mentioned problems, and provides a chuck grease supply device that can reliably supply grease to each sliding surface that requires grease lubrication over a long period of time. This is what I am trying to do.

Embodiments of the present application will be described below based on the drawings.

(The drawings are shown ignoring the possibility of assembly for the sake of simplicity.) Figures 1 to 4 show the first embodiment, in which 1 is a spindle of a machine tool such as a lathe, 2 is a chuck adapter fixed to spindle 1 with mounting bolt 3,
4 is a chuck fixed to the chuck adapter 2 with a bolt 5.

In this chuck 4, reference numeral 6 denotes a chuck body, which includes a face plate 7 having an overall cylindrical shape, a back plate 9 fixed to the back of the face plate 7 with mounting bolts 8, and a mounting bolt 10 fixed to the front of the face plate 7. A pilot bushing 11 is fixed to the pilot bushing 11. A sliding hole 12 in the rutting direction of the chuck 4 is formed in the center of the face plate 7, and a plurality of (three in this embodiment) chuck pawl grooves 13 (hereinafter referred to as pawl grooves 1) are formed on the front surface.
3) are formed radially at equal angular intervals. In addition, guide books 1 are provided on opposite sides of these pawl grooves 13, respectively.
3a is formed. A master jaw 14 is inserted into each pawl groove 13 so that it can freely move in the radial direction by connecting guide portions 14a protruding from both sides of the master jaw 14 to the guide groove 13a. A top jaw 15 is attached with a mounting bolt 16. The master jaw 14 and top jaw 15 constitute a chuck jaw 17. A wedge portion 14b having a T-shaped cross section is formed at the radially inner end of the master jaw 14. Next, a steel fitting portion 18a of the draw member 18 is fitted into the sliding hole 12 so as to be slidable in the bag line direction (left-right direction in FIG. 1). T-shaped wedge grooves 18b adjacent to the wedge portion 14b are formed on the outer periphery of the joint portion 18a of the draw member 18, and the wedge portion 1 of the master jaw 14 is formed in these wedge grooves 18b.
4b is iron-coupled for free movement. Upper draw member 18
The shaft portion 18c is inserted into the sliding hole 9a of the back plate 9 and protrudes into the hollow hole la of the spindle 1, and the rear end of the shaft portion 18c has a connection screwed into the drawbar 19 inside the spindle 1. A bolt 20 is connected by a fixing nut 21 or the like. The draw member 18, draw bar 19, and two connecting bolts constitute an operating member 22. The draw bar 19 is reciprocated in the wisteria line direction by a pneumatic or hydraulic cylinder (not shown) attached to the rear end of the spindle 1, and the reciprocating movement of the draw bar 19 causes the chuck claw 17 to is adapted to be slid in the radial direction. In the chuck 4 as described above, the grease supply device of this embodiment is further configured as follows. First, a storage chamber forming portion 23 is formed in the pilot bushing 11 of the chuck body 6, and this storage chamber forming portion 23 allows the super movement of the draw member 18 to enter the iron insertion hole 18d formed in the draw member 18 of the operating member 22. It is iron-inserted as if to forgive.

A grease storage hole 24, a cap insertion hole 25, and a cap head storage hole 26 are formed in this order in this storage chamber forming portion 23. This mouthpiece insertion hole 25 is formed to have a smaller diameter than the other holes 24 and 26, and the middle part 27a of the oil supply mouthpiece 27 is inserted into this mouthpiece insertion hole 25.
are fitted together so that they can slide in the axial direction. The oil supply cap 27 is biased rearward by a cap spring 28 compressed between the rear end bar 27b and the step of the cap insertion hole 25, so that the cap head 27c is pressed against the step of the cap insertion hole 25. The cap head 27c is located at the back of the cap head storage hole 26. Further, a check valve 29 as shown in the figure is provided in the middle of the oil supply hole 27d of the oil supply cap 27. A grease extrusion piston 30 is mounted in the grease storage hole 24 so as to be slidable in the axial direction, thereby forming a grease storage chamber 31. The grease in the grease storage chamber 31 is biased forward by the pressure spring 32 which is compressed between the grease extrusion piston 3 and the spring receiver 32 which is prevented from coming out by a circlip or the like (not shown). It is designed to pressurize. The pressure spring 32 has a larger spring force than the □ gold spring 28, and when the grease in the grease storage chamber 31 becomes low, the grease extrusion piston 30 moves to the oil supply mouth 27.
By pushing the grease forward, the operator can confirm that the grease is running low. Recessed grooves 34 and 35 are formed on the inner surface of the drum insertion hole 18d of the draw member 18 and the inner surface of the swamp hole 9a of the back plate 9, respectively.
A communication hole 36 is formed to allow the lotus 1 to pass through, and the draw part 18
There is a through hole 3 for moving the conveying groove 34 and the conveying groove 35.
7 is formed.

Reference numeral 38 denotes a grease metering feed device provided on the chuck body 6 and the chuck claws 17, and is provided for each chuck claw 17, respectively.

Since these grease metering feed devices 38 are constructed in the same way, only one of them will be explained next with reference to FIGS. 3 and 4. Reference numeral 39 denotes a pump hole formed in the face plate 7 from the outer peripheral surface toward the center, and a plunger 40 is enclosed in an iron bag so as to be slidable in the radial direction, thereby forming a pump chamber 41.

The plunger 40 is biased radially outward by the spring force of a return spring 42 compressed and interposed between the spring receiving portion 40a at the outer end and the face plate 7, and its outer end surface is formed in the master jaw 14. It is assisted by the actuation piece 43. A lotus hole 44 is closed on the side surface of the pump hole 39 at an appropriate distance from the bottom surface for allowing the lotus hole 35 of the back plate 9 to communicate with the pump chamber 41, and the master jaw 14 is in the open position. Plunger 40 when bet on
The inner end face of is slid radially outward from this entrance position,
The inner end surface of the plunger 40 that is slid to the closed position opens □
An appropriate amount of grease is spread in a radial direction from the position so that the grease in the pump chamber 41 is pushed out through a through hole 45 which is passed through a contact sliding hole to be described later. The communication hole 45
A check valve 46 is provided midway therein to allow flow from the pump chamber 41 side to the contactor sliding hole side, but to block the opposite flow. The check spring 46a of the check valve 46 is set to have a relatively large spring force so that the valve body 46b does not open due to the pressurizing force of the grease due to the spring force of the above-mentioned counter pressure 33. Reference numeral 47 denotes an inflow hole for allowing the bottom of the pump hole 39 and the through hole 44 to pass through each other, and the through hole 4 is inserted in the middle of the inflow hole.
A check valve 48 is provided that allows flow from the 4 side to the pump hole 39 side but blocks the opposite flow.

Next, reference numeral 49 denotes a contact sliding hole that opens at the bottom of the claw groove 13 and is formed in the face plate 7 so that its axis is parallel to the axis of the chuck body 6. A cap-shaped movable contact 50 having a through hole 50a is iron-mounted so as to be movable in the left and right directions in FIGS. 1 and 3.

This movable contactor 50 is biased in the projecting direction by a spring 51 compressed and sealed in the contactor tank movement hole 49, and its tip surface is supported by the back surface of the master jaw 14. Reference numeral 52 denotes a lotus through hole formed in the master jaw 14, one end of which is connected to the back surface, and the other end of which is connected to the sliding surface of the guide portion 14a, wedge portion 14b, etc., respectively.

The entrance 52a to the rear side of the lotus passage hole 52 is positioned so as to fit into the lotus passage hole 50a of the movable contact 50 at least when the plunger 40 is closing the opening of the transfer hole 44. Reference numeral 53 denotes a communication hole formed in the face plate 7, one end of which is connected to the contact emotion hole 49, and one end of which is connected to the abutment hole 12.
An opening is made on each side of the movement surface.

In addition, the lotus through hole 36 of the pilot bushing 11 described above,
The lotus passage groove 34 and the lotus passage hole 37 of the draw member 18, the lotus passage groove 35 of the back plate 9, the lotus passage hole 44 of the back plate 9 and the face plate 7, the pump chamber 41 and the lotus passage hole 45 of the face plate 7 , 53, the contact sliding hole 49, and the passage hole 52 of the master jaw 14 constitute a grease supply path 54 for moving the grease storage chamber 31 and each sliding surface. The effect will be explained.

First, with the chuck claw 17 slid to the open position,
When grease is press-fitted into the grease storage chamber 31 from the oil supply hole 27d of the oil supply cap 27 using a grease gun or the like, the grease moves the grease extrusion piston 30 to the left in FIG. 1 against the spring force of the pressure spring 33. The grease is slid and supplied into the grease storage chamber, and passes through the lotus passage hole 36, lotus passage groove 34, lotus passage hole 37, lotus passage groove 35, and lotus passage hole 44 to the grease metering feed device. 38 pump chambers 41.
As described above, the inside of the grease storage chamber 31 and the pump chamber 41 are
Even after the grease has been supplied from the oil supply hole 27d, the grease supplied therein is prevented from flowing out by the check valves 29 and 46 provided in the middle of the oil supply hole 27a and the lotus passage hole 45, and the pressure spring 33 is prevented from flowing out. It is stored in a pressurized state by the spring force. Grease can be supplied into the grease storage chamber 31 from one place from the front of the chuck 4, making it easy to supply grease even when the chuck 4 is installed on a machine tool with a loader or a cover. It can be carried out. next,
The drawbar 19 of the operating section 22 is moved to the left in FIGS. 1 and 3 to move each chuck jaw 17 toward the grasping position, thereby placing a workpiece (not shown) between each chuck jaw 17. The chuck claw 17 is used to grip the
When the lever is slid from the open position shown in FIG. 3 to the grasping position shown in FIG. make it move. This allows plunger 4 to reach through hole 4.
4, the grease in the pump chamber 41 is pressed to open the check valve 46, and the grease in the pump chamber 41 is brought into contact with the passage hole 45 until the chuck claw 17 reaches the grasping position. It is forcibly extruded into the child marsh moving hole 49. A portion of the grease pushed out into the contact sliding hole 49 in this way passes through the distribution hole 53 and passes through the sliding hole 12 of the face plate 7.
It is supplied to the silk moving surface between the inner surface and the outer peripheral surface of the iron fitting part 18a of the draw part village 18, and the rest is supplied to the lotus hole 52 of the master jaw 14 through the lotus hole 50a of the movable contact 50, The wedge part 14b and the wedge groove 1 pass through this lotus through hole 52.
8b and between the guide portion 14a and the guide groove 13a. As mentioned above, grease is supplied from the inside of the contact sliding hole 49 to the lotus through hole 52 of the master jaw I4 through the lotus through hole of the movable contact 50. Grease can be prevented from leaking from the gaps between the two, reducing grease waste. After that, the chuck 4 is rotated to process the workpiece, but in this case, the grease in the grease storage chamber 31 and the pump chamber 41 is prevented from being supplied to the contact super-motion hole 49 by the check valve 46. Therefore, leakage to the outside of the chuck 4 from each sliding surface is prevented. After processing the workpiece, the rotation of the chuck 4 is stopped and the chuck claws 17 are now slid in the radial direction to release the grip on the workpiece. When the plunger 40 is slid back, the plunger 40 is moved radially outward by the spring force of the return counter 42, and at this time, the pressurized grease in the grease storage chamber 31 pushes open the check valve 48 and flows into the pump chamber. 41. As described above, in this embodiment, a predetermined amount of grease is supplied to each sliding surface only when the chuck claws 17 are slid from the release position to the grasping position. Therefore, when the chuck 4 is not used for a long period of time, the amount of grease leaking out of the chuck 4 can be reduced even if the chuck claws are placed in either the grasping position or the open position. It can be made zero. Next, when the grease in the grease storage chamber 31 becomes low, the grease extrusion piston 30 pushes the oil filler cap 27 forward by the spring force of the pressurizing spring 33. This allows the operator to visually check the amount of remaining grease from the front of the chuck 4. It can be confirmed that there are few FIG. 5 shows a second embodiment of the present application, in which a grease storage chamber 31e is formed in the shaft portion 18ce of the draw member 18e, and the grease metering feed device is omitted.

Lotus through hole 50ae of movable contact 50e and master jaw 1
The closing opening 52ae of the lotus passage hole 52e of 4e is opposed to each other when the master jaw 14e is slid to the grasping position, and is opposed to each other when the master jaw 14e is slid to the open position. Now that it's gone, Rentsu is now cut off. Therefore, when the chuck 4e is not used for a long period of time, by keeping the chuck claws 17e in the open position, the amount of grease in the grease storage chamber 31e leaking out of the chuck 4e per unit time can be extremely reduced. can do. Note that for parts that are considered to have the same or equivalent configuration as the first embodiment, the same reference numerals as those of corresponding parts are given the letter "e", and redundant explanation will be omitted. (Furthermore, the following third embodiment is similarly marked with the alphabet f to omit redundant explanation.) Fig. 6 shows the third embodiment, in which there is a grease storage chamber in the periphery of the face plate f. 31f is formed.

The grease storage chambers 31f are provided at positions that are equally divided around the center of rotation so as not to upset the rotational balance of the chuck 4, and each grease storage chamber 31f has a wide opening. In the first embodiment, the movement of the master jaw is used to feed the grease in a fixed amount, but the movement of an operating member such as a draw member may be used to feed the grease in a fixed amount.

In addition, in each embodiment, a movable contactor is used to prevent grease from leaking from the gap between the chuck body and the chuck jaws, but the sliding and layering surface of the master jaw When supplying grease between the chuck jaws in a place where the gap between the main body and the chuck jaws is small, the movable contactor is not necessary. Further, although each of the embodiments shows a case where the invention is applied to a clean type chuck, the present invention can be similarly applied to other types of chucks such as a crank type chuck and a drawdown type chuck. In addition, although not shown in the above embodiment, if the grease supply path is branched, a fixed or variable throttle may be provided in the middle of the branched grease supply path as necessary for each sliding surface. It is a good idea to supply just the right amount of grease. As described above, in the present invention,
The grease in the grease storage chamber is pressurized, and the pressurized grease is supplied to each sliding surface from the grease supply joint path.By filling the grease storage chamber with grease, each sliding surface is This has the effect of reliably lubricating moving surfaces with grease over a long period of time with little waste.

In addition, the grease is transferred from the chuck body to the chuck jaws using a movable contact to prevent grease from leaking from the gap between the chuck body and the chuck jaws, thereby preventing grease leakage even when supplying grease to the chuck jaws. This has the advantage that the amount of grease can be extremely reduced, and that the lotus hole of the movable contact can be closed by changing the position of the chuck claw, thereby preventing grease leakage over a long period of time. In addition, even if grease can be reliably supplied as described above, a grease storage chamber is formed in the chuck body or the operating member, and the grease in this grease storage chamber is pumped using the spring force of a pressurizing spring. Since it is extruded, there is no need to separately install piping for grease supply when attaching the chuck to the spindle, and there is an advantage in handling that the chuck attaching work can be done quickly.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the first embodiment.
1 line is shown, and FIG. 2 is a 0-0 line sectional view of FIG.
Fig. 3 is an enlarged view of the main part of Fig. 1, Fig. 4 is a sectional view showing the operating state, Fig. 5 is a sectional view showing the second embodiment, and Fig. 6 is a sectional view showing the third embodiment. be. 4...Chuck, 6...Chuck body, 22...Operation member, 24...Grease storage hole, 30...Grease extrusion piston 3
1... Grease storage chamber, 33... Pressure spring, 54... Grease supply path. Figure 1 Figure 2 Figure 5 Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] 1. A grease storage hole is formed in the chuck body or the operating member, and a grease extrusion piston is slidably fitted into the grease storage hole to form a grease storage chamber capable of storing grease supplied from the outside. The grease extrusion piston is biased by a pressure spring so that the grease in the grease storage chamber can be pressurized, and the chuck body has one end communicating with the grease storage chamber and the other end opening at the bottom of the chuck pawl groove. A movable contact having a communicating hole in the tip surface is fitted in the vicinity of the opening of the grease supply path to the chuck pawl groove so as to be slidable toward the chuck pawl,
This movable contactor is biased by a spring to bring its tip end into contact with the back surface of the chuck claw, and the chuck claw is coated with grease, one end of which communicates with the sliding surface of the other member and the other end of which opens on the back surface. A chuck grease supply device characterized in that a supply path is formed, and the communication hole of the movable contact and the opening of the grease supply path of the chuck pawl are positioned so that they can communicate with each other.