DE3443072A1 - Torque limiter - Google Patents

Abstract

To reduce premature wear, reduce weight and make the torque limiter easy to handle and pleasant to operate, the torque limiter provided can be set without an auxiliary tool and without changing the set torque, being constructed as an exchangeable unit on the ball-and-roller principle.

Description

Torque limiter

The invention relates to a torque limiter with a cylindrical Housing with a fixed end wall and a cover plate and one arranged therein Trigger mechanism that is effective at a torque, the drive and Output takes place through inner stop and outer stop part.

The torque limiter is intended to apply a set torque to the behraube and can be adjusted to the appropriate moment during use and be convertible, or have the same target torque by adjusting the interior height.

Such torque limiters are already known and, inter alia, in the U.S. Patent Nos. 3,012,456, 7,137,187, 557,724, and 3,595,105 in the form of torque wrenches and torque limiters, which are described used when tightening fastening elements such as nuts, screws and bolts to achieve certain exerted torques.

Existing versions have the disadvantage that they are complete Tools with levers or as complicated mechanisms with hard metal friction surfaces, which are part of the housing. Due to the multitude of superfluous Elements themselves are heavy and expensive. The rapid wear and tear of the friction surfaces makes this torque limiter unusable. he adjustment mechanism is complicated and can be done without tools, e.g. B. Screwdriver, not set will.

The invention is based on the object of a torque limiter with exchangeable hard metal release elements in a simple torque adjustment mechanism as to create with simplified and few construction parts. In addition, the friction should be reduced as much as possible.

This object is achieved in that a torque limiter is created is, in which the triggering of the torque limit by hard metal ball (1) and preferably Hard metal cylinder roller (2) on which a neck (3) with the radius (15) of the hard metal ball (1) is attached, the hard metal ball (1) and the preferably hard metal cylinder roller (2) are compressed with a preferably disc spring column (28), takes place, the hard metal ball (1) and the preferably hard metal cylinder roller (2) being rotatable are stored and attached as far as possible to the housing shell (24) from the inside be, the preferably hard metal cylinder roller (2) in a preferably Evenly spaced, outwardly open radial bores (12) in a Roller bearing washer (27) having a recessed track (9) with a radius equal to that Radius of the hard metal ball (1), must be installed, whereby the path depth (33) is chosen so that the web (9) with the preferably hard metal cylinder roller (2) cross in the neck area of the same and that the preferably hard metal cylinder roller (2) in the middle of the track (9) a transverse barrier with a height of the spring travel plus Cover thickness (29) forms, furthermore, the hard metal balls (1) are preferably in the Drive pulley (4) installed so that the hard metal ball (1) in the direction of the preferably hard metal cylinder rollers (2) at the height of the spring travel plus distance between the cylindrical roller jacket surface (47) and the drive pulley surface having, the hard metal ball (1) on the opposite side with the preferably Spring cover plate (14) touches and there in the cover plate ball track (8) rolls, in addition, the preferably disc spring columns (28) are rotated around their own axis in with respect to the spring housing, which is also the spring guide (45) and preferably represents the housing of the torque limiter, installed non-rotatably, the setting or conversion of the setpoint torque by means of a pair of threads (30) that is affected by the action of torsional forces is blocked by longitudinal sliding connection preferably toothing (49), and through Threaded element (31), pressure distribution disc (19), stop element (42) made the adjustment structural parts can be on the side of the drive as well as output.

Furthermore, the object is achieved in that a variant with individually working balls (32) is provided, in which the housing drum (46) with preferably four spring guides (45), which run parallel to the longitudinal axis (35), installed and in the spring guides (45), preferably cup spring columns (28), spring cover disks (14) and ground balls (32) must be installed, and above the ground balls (32) a cylinder space (50) in which the cover disk (43), preferably a standard roller bearing ring (25), drive pulley (4) with a preferably inner stop part (23).

The construction parts of the conversion are on the housing base (44) such as pressure distribution disk (19), pair of threads (30), threaded part (31), stop element (42) attached.

In the manufacture of the torque limiter without conversion and adjustment in such a way that it will be specified immediately after the production of the torque limiter Setpoint torque is reached, the interior height (52) through the shoulder (51) is the corresponding Adjusted target torque.

The rotatably mounted hard metal cylinder roller (2) can also be used in the Cylindrical pulley (27) are installed so that they are slightly less than their radius protrudes from the surface of the same.

The setting is also achieved by means of a pair of internal threads that go over the toothing is produced, achieved after the setting in this case the cover disc (43), to prevent spinning, frictionally with the housing jacket (24) tied together.

A hole is made along the axis (35) in the drive pulley (4) (54) attached, in which a compression spring (53) to hold the hard metal balls (1) built into its ball bed (6).

To use such a torque limiter once at a specific moment set are a pair of threads (30), threaded part (31) and a stop element (42) installed in a bore in the outer stop part (5) or inner stop part (23). By adjusting the pressure distribution disc (19), which is preferably with the Is connected to the disc spring column (28), the target torque is set on a device. To increase security, the stop element (42) is preferably provided with a Eappe (22) covered.

When manufacturing the torque limiter with changing the target torque the maximum target torque is to be set on the setting device by punching in to be fixed and, starting from the maximum setpoint torque, further required divisions to undertake. In this way, the manufacturing accuracy is largely reduced of construction elements.

In addition, grinding in (repeated spinning at the maximum target torque) advisable before setting the two variants.

If greater accuracy of the target torque is required, a rotatable inner drum (37), similar to a revolver drum, is provided in the the spring guides (45) radially, along the axis, as far as possible on the edge of the drum shell are attached, and each opposing spring guides (45) with a bottom (41), which results in a greater spring deflection with the same inner drum height, achieved, which enables a more precise adjustment.

The advantages achieved with binding are in particular: that instead of a large number of large hard metal parts, smaller preferably replaceable ones in- are set. Two rotatable hard metal parts make a smoother and more accurate as well as a longer usage time achieved. By the lower The size and weight will make the torque limiter easier to handle achieved. When setting the target torque, there is no longer an additional tool necessary.

An embodiment of the invention is shown in the drawing and is described in more detail below.

1 shows a section through the longitudinal axis (35) of the torque limiter with hard metal balls in two planes Fig. 2 - Top view A-A of the cylindrical roller disc (27) with built-in hard metal cylinder rollers (2) Fig. 3 - Section B-B of the cylinder roller disc (27) with hard metal cylinder rollers (2) Fig. 4 - Section through the longitudinal axis of the Torque limiter with a high accuracy of the target torque setting. Broken Spring column.

Fig. 5 - Section D-D. Top view of the inner drum with balls (32) and guide base pair (41) Fig. 6 - Section through the longitudinal axis (35) of the torque limiter with a disc spring column and a ball bearing fused in the drive pulley (4) Fig. 7 - Section through the longitudinal axis (35) of the torque limiter with a Housing drum (46) and the ability to change the target torque on the housing base (44) Fig. 8 - Section through the longitudinal axis (35) of the torque limiter with a Fused rubber spring (21) and setting in the inner stop part (23) and a ball bearing with the drive pulley (4) 21ig 9 - section through the longitudinal axis (35) of the torque limiter with the possibility of converting the Target torque and standard roller bearing ring (25) Fig.10 - Section through the longitudinal axis (35) of the torque limiter with a Disk spring column (28) and setting in the inner stop part (23) and standard roller bearing ring (25) Fig. 11 - Section through the longitudinal axis (35) of the torque limiter with a Disc spring column (28), an adjustment option in the inner stop part (23) and a ball bearing fused with the drive pulley (4) Fig.12 - view. Carbide cylinder roller (2) with neck and hard metal ball (1) Fig. 1 / - detail. Attachment of the spring protection jacket (18) with the spring cover disk (14) and pressure distribution disk (19) Fig. 1 - section O-C. Disc spring column break for increasing; increase of the spring deflection Fig. 1 / - partial section through the cylindrical roller disc (27) with the hard metal cylinder roller (2).

Variant.

Furthermore, the drawings are explained by the reference symbols.

1 Carbide ball 2 Carbide cylinder roller 3 Neck 4 Drive pulley 5 Outer stop part 6 Ball bed 7 Sliding connection, preferably toothing (49) 8 Cover disk ball track 9 track 10 housing teeth 11 drive pulley teeth 12 bore 13 free 14 spring cover disk 15 radii 16 cover disk teeth 17th Sealing ring 18 Spring protection jacket 19 Pressure distribution disc 20 Stop hole 21 Rubber spring 22 Cap 23 Inner stop part 24 Housing jacket 25 Standard roller bearing ring or standard ball bearing ring 26 flange, locking ring, weld seam 27 cylindrical roller disc 28 preferably disc spring column 29 cover thickness 30 thread pair 31 thread part 32 Bottom ball 33 Track depth 34 Lid ball 35 Axis 35 Recess 37 Inner drum 38 Drum spring guide (bore) 39 base 40 housing track 41 guide base pair 42 stop element 43 Cover disk 44 Housing base 45 Spring guide 46 Housing drum 47 Cylindrical roller jacket surface 48 Adjustment travel 49 Toothing 50 Cylinder space 51 Shoulder 52 Inner length 53 Compression spring 54 bore

Claims (1)

Claims: 1. Torque limiter with a cylindrical housing with a fixed end wall and a cover plate and a trigger mechanism arranged therein, which is effective at a target torque, whereby the input and output are controlled by inner stop and outer stop part takes place, characterized in that the triggering of the torque limit by hard metal ball (1) and preferably hard metal cylinder roller (2) on which a preferably the neck (3) with the radius (15) of the hard metal ball (1) is attached, wherein the hard metal ball (1) and the preferably hard metal cylinder roller (2) with a preferably disc spring column (28) are compressed, takes place, wherein the hard metal ball (1) and the preferably hard metal cylinder roller (2) rotatable are stored and attached as far as possible to the housing shell (24) from the inside be, the preferably hard metal cylinder roller (2) in a preferably Evenly spaced, outwardly open radial bores (12) in a Roller bearing washer (27) having a recessed track (9) with a radius equal to the Radius of the hard metal ball (1), the path depth (33) is chosen so that the web (9) with the preferably hard metal cylinder roller (2) cross in the neck area of the same and that the preferably hard metal cylinder roller (2) in the middle of the track (9) a transverse blocking of a height of the spring travel plus the thickness of the cover (29) forms, furthermore, the hard metal balls (1) are in the preferably drive pulley (4) installed so that the hard metal ball (1) faces the direction of the hard metal cylinder rollers (2) at the height of the spring travel plus the distance between the cylindrical roller jacket surface (47) and drive pulley surface, the hard metal ball (1) on the Opposite side with the preferably spring cover disk (14) touched ulld rolls there in the cover disk ball track (8), and the Disc spring columns (28) around their own axis with respect to the operator housing, which at the same time represents the spring guide (45) and the preferably torque limiter housing, non-rotatably installed, whereby the setting or adjustment of the target torque is carried out a pair of threads (30), which is preferably affected by torsional forces through a longitudinal sliding connection Toothing (49) is blocked, and by threaded part (31), pressure distribution disc (19), stop element (42) is made, the adjustment structural parts can be attached to the side of the drive and output. 2. Torque limiter according to claim 1, characterized in that a variant with individually working balls (32) is provided in which the housing drum (4G) with preferably four spring guides (45) parallel to the longitudinal axis (35) run, are installed and in the spring guides (45) preferably disc spring columns (28), spring cover washers (14) and ground balls (32) are also installed Above the bottom balls (32) a cylinder space (50) in which the cover plate (43), preferably standard ball bearing ring (25), drive pulley (4) with a preferably Inner stop part (23) arranged. 7. Torque limiter according to claim 1, characterized in that that in the manufacture of the torque limiter without conversion and that its intended target torque immediately after the torque limiter has been manufactured To achieve, the interior height (52), through the shoulder (51), is adapted to the target torque. 4. torque limiter according to claim 1, thereby identified "BarS'dadie 'rotatably mounted, preferably hard metal cylinder roller (2), can also in the cylindrical roller disc (27) are installed so that they are slightly less than their radius protrudes above the surface of the same. 5. Torque limiter according to claim 1, characterized in that thread pair (30), thread part are used for a one-time setting of the target torque (31) and a stop element (42) in a bore in the outer stop part (5) or Inner stop part (23) installed, whereby by adjusting the pressure distribution disc (19), which is connected to the preferably disc spring column (28), becomes the target torque set on a device, and to increase the safety of the stop element (42) covered with a cap (22). 6. torque limiter according to claim 1, characterized in that the accuracy of the setting of the target torque by means of a rotatable inner drum (37), which is similar to a revolver drum, in which the spring guides (45) radially, longitudinally the axis, are largely attached to the edge of the drum shell, and each opposite Spring guides (45) are completed with a base (41), is increased, and Although there is a greater spring deflection with the same inner drum height, which is more precise Setting enabled. 7. Torque limiter according to claim 1, characterized in that a hole (54) is made in the drive pulley (4) along the axis (35), in which a compression spring (53) to hold the hard metal balls (1) in their ball beds (6) becomes effective.