JPH08232970A - Toothed shaft coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft coupling for allowing the displacement of a shaft in the axial direction, completely or mostly ensuring insertion connection, correcting inaccuracy between the driving side and the driven side and totally mounting a driving device coupled to a driven device in a very simple structure without using an adjusting tool. SOLUTION: This shaft coupling has an inside member 3 as a fixed shaft coupling boss and an outside member 1 as a fixed flange formed of elastic material. These members are concentrically fixed and fitted to each other to form integrated shaft coupling members 1, 2, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing flange detachably connected to a driving device and a driving flange for transmitting an elastic torsion moment, particularly for connecting an internal combustion engine to a working machine such as a hydraulic pump. And a shaft coupling boss that can be fixed to a machine, and an axially and angularly movable insert-type toothed shaft coupling.

[0002]

2. Description of the Related Art Flexible shaft couplings for connecting an internal combustion engine and a working machine are disclosed, for example, in German Official Gazette No.
608. In the case of the shaft coupling disclosed in the publication, there is an annular coupling element made of an elastic material between the driving coupling half and the driven coupling half, and the coupling elements are arranged in the periphery and alternately in the axial direction and the radial direction. Are fastened to both fitting halves with fixing screws arranged in the axial direction, the axial threads entering the flange end surface of one fitting half and the radial threads entering the cylindrical outer surface of the other fitting half. The shaft coupling element is movable both radially and axially and between both coupling halves.

[0003]

Due to the above construction, this shaft coupling is made up of three mutually tightenable members, which require precise mutual adjustment when mounted. During manufacture, the metal body gripped by the fixing screw must be vulcanized together with the elastic ring by a special working process.

In addition, as a commercially available torsion-flexible shaft coupling having elements for compensating the radial, axial and angular displacements of the connected machine, the transmission of a torsional moment is achieved by an annular rubber element which requires torsional shearing. Possible embodiments are known. Each displacement is completely absorbed in the radial, angular and axial directions by the rubber element, and in the case of the axial displacement, the rubber is relatively stiff due to the pressure load, so that the reaction force becomes large. In order to eliminate this drawback, a shaft coupling has been developed in which pins arranged on the outer diameter or the inner diameter can be attached in a pluggable manner. Achieving such a pin-plug connection is costly and expensive. The flange for receiving the pin and the corresponding member cause the rattling noise and wear of the pin connecting portion due to the circumferential play, and therefore the manufacturing tolerance must be small. In addition, it is necessary to protect the pins from the friction rust generated by the plastic coating. Another drawback of the plug-in connection is that only axial displacement is allowed. In such an embodiment, angular misalignment must be corrected by the strain energy of the rubber as before.

In another commercially available shaft coupling, a shaft coupling boss with spherical external teeth is adapted to fit directly into a shaft coupling flange with internal teeth, which is made of plastic. Yes, it is fixed directly to the drive with screws.
It is not necessary to provide a mounting opening in the casing of the drive device, and since it is fixed to the drive device, the shaft coupling boss fixed to the driven set can be pushed into the inner teeth of the flange together with the attached outer teeth. Therefore, it enters through the outer portion of the shaft coupling flange. Such examples are described in "Shaft Coupling Illustrated", a. Schalitz, 4th
Edition, shown in Figures 3.2.7-16.

Further, there is DE-OS 34 34 722 as a shaft coupling having a high elasticity and a complicated structure.
The members that can be fixed on the drive side and the driven side of this shaft joint cannot be inserted into each other after fixing. In this case, if fundamental simplification is attempted, the assembly cost is very high.

A toothed insertable and axially and angularly movable tooth for transmission of elastic torsional moments by means of a fixed flange detachably connected to the drive device and an externally toothed shaft coupling boss fixable to the driven device. As a shaft coupling,
There is DE-PS 37 02 778. in this case,
By at least one element of vulcanized elastic material,
A plastic shaft coupling bush is connected to the fixing flange. This elastic element forms a ring, by means of which the torsional moment is introduced and accepted at the axial end of the elastic element.

The present invention has been made to solve the above-mentioned conventional problems, allows axial displacement in the axial direction, and enables complete or most of the displacement by a plug-in connection.
To provide a shaft coupling which corrects the inaccuracy between the driving side and the driven side and allows a total mounting for coupling the driving device with the driven device without an adjusting device with a particularly simple structure. With the goal.

[0009]

SUMMARY OF THE INVENTION The present invention forms a concentrically fixedly fitted integral member that includes an inner member as a fixed shaft joint and an outer member as a fixed flange made of an elastic material. It is a shaft coupling member.

The shaft coupling according to the invention is characterized, inter alia, by its very simple construction and by its extremely low cost.

In particular, the shaft coupling boss enters the fixing flange in conjunction with the concentric teeth for ensuring compatibility. This makes it possible to combine with a drive with a basic model of various axes.

It is particularly advantageous that the shaft coupling boss with the fixing flange is connected to the inner teeth by an intermediate member in the form of a bush made of a rigid material embedded in the material of the fixing flange. In this case, the boss is registered trademark Pol
The fixing flange may be polyurethane, although it is preferably made of a hard plastic such as yloy. During manufacture, the boss is extrusion coated with the soft material of the fixed flange. It is not necessary to carry out another vulcanization step subsequently. On the other hand, the axial boss may be steel as the fixing element. Axial bosses with small outer teeth fit into corresponding inner teeth of a hard plastic bushing.

In order to further improve the connection with the fixing flange, the bush can be provided with a flange that surrounds the outer periphery of the bush, and can also be provided with external shaft teeth for twist-fixing glazing with the material of the fixing flange.

To ensure axial displacement, the shaft coupling boss at one end may be provided with a clamping ring which surrounds its outer circumference, in which case there is a separate outer tooth end before the clamping ring. Since the flange, which points inward in the radial direction of the boss, fits into the space between the tightening ring and the teeth, axial displacement becomes impossible after the tightening ring is attached.

Due to the special outer shape, the elasticity of the fixing flange is sensitive, which can be protected by a particularly triangular shape. The inside of the chamfered corner is provided with a fixed opening for a screw for mounting the flange of the drive set. In addition, it is possible to arrange notches that influence the elasticity inwardly from the screw opening. The outer shape is preferably triangular, but it is also conceivable to implement a square structure or the like.

The shaft of the driven device can be pushed weakly into the teeth of the shaft coupling. In addition to its simple structure and easy assembly without adjustment tools, one of the advantages is the interchangeability of shaft coupling bosses. Only the basic model can be versatile with different pump shafts besides the boss.

That is, in the case of various driven devices such as pumps having a conical shaft or a cylindrical shaft, it is possible to fix the shaft coupling to the driven shaft first and achieve the desired insertability on the outer teeth of the shaft coupling. is there. All that is required is an inventory of different shaft couplings for different shaft sizes.

The shaft coupling according to the present invention is suitable for fixing to a motor flywheel with a cylindrical screw having a hexagonal hole.
Preferred drives are pumps, especially axial piston pumps, gear pumps and the like. This shaft joint makes it possible to correct inaccuracy on the driving side and the driven side of at least 0.5 mm in the radial direction. An economically advantageous production is ensured by combining the bushing as a molding and the fixing flange without additional machining. Inside the shaft coupling,
It can be mechanically finished by off-the-shelf products with internal boring teeth as toothed bushes with rotating external teeth.

Other features that advantageously form the subject of the invention are set forth in the protective claims.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION One of many possible embodiments will be described below.
One is illustrated and specifically described.

The shaft joint according to the present invention comprises a fixing flange 1 made of elastic plastic such as polyurethane and having a substantially equilateral triangular outer shape, a bush 2 made of hard plastic, and a shaft joint boss 3 made of steel. The three members fit together to form a unitary member. That is, the above 3
The two parts are connected together so that they cannot be lost. In this case, the bush 2 which is the central member is firmly coupled to the fixed flange 1 by extrusion coating with the material of the fixed flange 1, but the shaft joint boss which is the inner member is formed of both outer members. Stationary in the hole.

In the region of its chamfered corner 4, the fixing flange has a hole 5 for receiving a fixing screw, for example a cylindrical screw with a hexagonal hole. These holes are reinforced with steel bushes 6.

A notch 7 is provided radially inward between the hole and the bush, which further affects the elasticity of the fixed flange.

The bush 2 is provided with a flange 8 and an outer tooth 9 which surround the entire outer circumference on the outer circumference thereof, and achieves a good connection and a firm connection with the fixed flange even when the torsional moment and the axial displacement force are large. . Since the depth and width of the groove of the external tooth are different in order to obtain a substantially uniform side surface force of the bush, the distortion of the bush due to extrusion casting injection during manufacturing is avoided. Bush internal teeth 1
Reference numeral 0 is a small size and enters the outer teeth 11 of the shaft coupling boss 3.
This is done by means of a groove 12 for receiving a clamping ring 13 at the drive end of the internal tooth. A space is provided between the tightening ring and the drive-side end of the boss outer tooth in order to provide a space for the bush 2 to enter the flange that is radially inward. When the tightening ring is inserted, the shaft coupling is fixed against axial displacement inside the bush 2. The inner teeth 15 of the shaft coupling boss can be implemented as normal involute teeth, for example.

Upon assembly, this shaft coupling is secured to the engine flywheel or the like only by cylindrical screws not shown here. For example, in the case of the driven side shaft end of the hydraulic pump, it is necessary to insert it into the inner teeth 15 of the shaft coupling boss 3 with the corresponding outer teeth.

[0026]

According to the present invention, an inner member serving as a fixed shaft coupling boss and an outer member serving as a fixing flange made of an elastic material are provided, and both members are fixed concentrically.
Since they are fitted to each other to form the integral type shaft coupling member, the mounting structure is very simple, and the manufacturing cost can be extremely low.

Further, since the shaft joint boss is inserted into the fixed flange in conjunction with the concentric teeth for ensuring compatibility, it is possible to connect with the drive device in various basic models of shafts.

[Brief description of drawings]

FIG. 1 is a view of a side of a shaft coupling facing a driven device.

FIG. 2 is a cross-sectional view of a shaft coupling.

FIG. 3 is a cross-sectional view of a bush made of hard plastic.

FIG. 4 is a view showing a front surface of a bush.

FIG. 5 is a cross-sectional view of a shaft coupling boss.

6 shows a front view of the shaft coupling according to FIG.

[Explanation of symbols]

 1 Fixed Flange 2 Bushing 3 Shaft Coupling Boss 4 Chamfering Angle 5 Screw Receiving Hole 6 Steel Bushing 7 Notch 8 Flange 9 External Teeth 10 Bushing Internal Teeth 11 Boss External Teeth 12 Groove 13 Ring 15 Boss Internal Teeth

Claims (13)

[Claims] 1. To transmit an elastic torsion moment,
In particular, in order to connect the internal combustion engine to a working machine such as a hydraulic pump, a fixing flange separably connected to the drive device and a shaft coupling boss that can be fixed to the machine being driven are provided, and the axial and angular directions are An inner member as a rigid shaft coupling boss (3) in a movable insert type toothed shaft coupling;
Outer member as fixed flange made of elastic material (1)
A toothed shaft coupling, comprising: a shaft coupling member (1, 2, 3) concentrically fitted together to form an integral member. 2. The shaft coupling according to claim 1, wherein the shaft coupling boss is connected to the fixed flange by concentric external teeth (11) to ensure compatibility. 3. The rigid material (2) in which the shaft coupling boss and the fixed flange are embedded in the material of the fixed flange.
3. Coupling according to claim 1 or 2, characterized in that it is joined by an intermediate member in the form of a Bosch. 4. The shaft joint according to claim 1, wherein the Bosch is made of hard plastic. 5. The shaft coupling according to claim 1, wherein the Bosch is manufactured by Polyloy and the fixing flange is manufactured by polyurethane. 6. The shaft joint according to claim 1, wherein the shaft joint boss is made of steel. 7. The shaft coupling according to claim 1, wherein the shaft coupling boss and the bush are mutually gripped by a grooved tooth (10, 11). 8. The shaft coupling according to claim 1, wherein the bush includes a flange that surrounds an outer periphery of the bush. 9. The shaft coupling boss is provided with a separable tightening ring (13) surrounding the outer circumference in order to avoid axial displacement at one end, and the external teeth end in a position separated from the tightening ring. 9. The bush according to claim 1, characterized in that the bush is inserted into the space between the tightening ring and the tooth (11) by means of a flange (14) pointing radially inward. The shaft coupling described in. 10. The outer shape of the fixing flange is substantially triangular with a chamfered end (4) and an opening for a fixing screw arranged therein. 9. The shaft coupling according to any one of 9. 11. The fixing flange in the area between the screw opening and the bush is provided with a notch (7).
Shaft coupling described in one. 12. Bush (2) according to any one of claims 1 to 11, characterized in that it is embodied by axial teeth (9) at the outer circumference for fixing with the material of the fixing flange. The described shaft coupling. 13. The external toothing (9) of the bushing is formed with different depths and widths in order to obtain a substantially uniform bush lateral force. Shaft coupling described in one.