JPH0642546A - Journal hauling body of cardan joint - Google Patents

Abstract

PURPOSE: To provide a joint constituted in as short dimension as possible with respect to a journal entraining body of a propeller shaft. CONSTITUTION: This journal entraining body 1 is constituted in a compact manner so as to recompensate (offset) an extended part of a length partially. A central part 2 of the journal entraining body 1 forms a compact and integrated unit together with a journal 3 and a flange 6, and a cross key 8 in some cases. Furthermore, a recessed part 12 is formed in a scope between both journals 3 so that a joint portion on the opposite side approaches the journal entraining body together with the other journal 3 in a joint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller shaft rotation axis which is arranged between a drive shaft or a driven shaft for transmitting torque and an oscillating center portion of a cardan joint, and with respect to the oscillating center portion. To a journal drive of a propeller shaft of the type movably mounted in an oscillating center by at least one journal extending along a journal axis lying at right angles to the journal axis.

[0002]

Cardan joints for propeller shafts of this type are already known and are disclosed, for example, in DE-A 2734048. This type of joint is used to form a non-rotatable joint for transmitting torque between the longitudinally slidable propeller shaft part and the shaft to be driven.

Suitable for application of this type of cardan joint is a propeller shaft in which the bending stress applied during operation is kept to a relatively small value. In this case, the imbalance in the rotational movement caused by the axial distance between the journal axes is largely harmless. Moreover, the advantage of this construction is that the joint for transmitting the predetermined torque can be configured as a joint having a relatively small rotating diameter, or a considerably large torque can be transmitted by the joint having the predetermined diameter. Can be mentioned.

The known type of joint, however, suffers from the disadvantage that the axial design dimensions of the entire joint must be designed to a fairly large value. This drawback is particularly noticeable when the joint between the journal and the component carrying it must be strongly constructed, and in order to meet this further requirement Space is limited, and it is inevitable to increase the bending angle.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to improve the previously known joints of the type mentioned at the outset to reduce the required axial constructional dimensions as much as possible.

[0006]

SUMMARY OF THE INVENTION A journal driver according to the present invention comprises a flange for fixing to an end surface of a drive shaft or a driven shaft, and a central portion centrally connected along the rotation axis of a propeller shaft. , Two journals having a common journal axis extending perpendicular to the axis of rotation of the propeller shaft, in which case the flange, the central part and the journal are combined as a compact, unitary unit.

[0007]

According to the invention, the flange having the central portion and the respective journals are arranged in close proximity to each other so as to obtain a shape-stable unit which requires only a small axial configuration dimension. It is possible to at least partially offset the required length dimension of a cardan joint whose respective journal axes are axially spaced.

[0008]

Further preferred embodiments of the invention are disclosed in the respective dependent claims.

The embodiments according to claims 2 to 5 relate to a structure in which the flange is fixed to the shaft by means of an integrally molded solid cross key, in which case the flange and the shaft are connected to each other via a threaded joint. Be combined.
The cross key preferably extends at right angles to the journal axis, in which case each threaded connection is arranged circumferentially between the cross key and the journal or journal axis.

According to the sixth aspect, since the torque is transmitted between the shaft and the flange, a radial serration flange can be provided.

Claims 7 to 9 disclose the construction of flanges having smooth surfaces parallel to each other, which are fitted in identically shaped recesses formed in the shaft by means of screws. It is fixed.

If these smooth surfaces are formed like wedges (keys) towards the shaft as disclosed in claims 10 and 11, the axial force exerted by the fixing screws is on the smooth surfaces. It produces a large circumferential force that acts against it. According to this measure, each passive side of the smooth surface is never unloaded in the event of an alternating load and no fine wear (fretting) occurs, so a mechanical connection with a satisfactory service life. Part is obtained.

In the embodiment disclosed in claim 12, one recess is provided in the area between the two journals in the central part, and according to this measure, two journal entrainers of the same construction type are provided. It is possible to place the two close to each other on the rear side, which also serves to reduce the structural length dimension of the joint. A partial surface forming an outer contour of the central portion, that is, a normal plane which is paired with each other and is substantially flat and extends substantially parallel to the journal end surface, and one of the outer peripheral surface of the cone. A configuration with two curved outer surfaces forming a part is disclosed.

[0014]

The invention will now be described in detail with reference to an embodiment illustrated in the accompanying drawings: a short-dimension journal driver (1) according to the invention depicted in perspective in FIG. 1 has a central part (2). A flange (6) having a relatively large diameter is connected to the end face side of the central portion (2). Two journals (3) are arranged on the opposite side of the central portion (2), each journal (3) corresponding to a common propeller shaft axis of rotation along a common journal axis (4). It extends radially outward with respect to the rotation axis (5). The journal axis (4) is orthogonal to this axis of rotation (5).

The flange (6) is a journal entrainment body (1).
Has a cross key (8) which is used to fix the shaft to the end surface of the drive shaft or the driven shaft and extends in the axial direction. The same cross key (8) is also arranged on the opposite flange surface, which cannot be seen from FIG. The end surface of the shaft (not shown) is formed with a recess having the same shape for receiving the cross key (8), so that form-locking torque transmission can be achieved. The flange (6) is connected to the shaft via a mounting surface (7) located on the end face side, and the two are coupled by a screw joint which is passed through a fixing hole (9).

2 and 3 show the bottom surface of the journal carrier (1) according to FIG. As is clear from these figures, the cross key (8) has a common vertical axis (8
a) and the longitudinal axis (8a) extends at right angles to the journal axis (4) when viewed in the direction of the axis of rotation (5). In this case, each fixing hole (9) is located in the circumferential direction between the cross key (8) and the journal (3) extending along the journal axis (4), respectively. FIG. 3 shows a front view of the cross key (8) viewed in the direction of the arrow in FIG. 2. As is clear from this, the flange (6) is shown.
The cross key (8) is also integrally formed, as is the case with the central part (2) and the journal (3).

FIGS. 4 and 5 show an alternative construction known per se for the form-fitting connection of the flange (6) and the drive or driven shaft (not shown) by means of radial serrations (10). Has been done. The connection between the flange (6) and the end face of the shaft is again carried out by means of screws which pass through the arrow fixing holes (9).

FIGS. 6 and 7 show an alternative design for the form-locking transfer of torque by means of two parallel smooth surfaces (11). These smooth surfaces (11) are engaged on the end surface side of the shaft having a suitable corresponding surface. Also in this embodiment, the connection between the two is made by a screw penetrating the fixing hole (9).
In order to effectively approach the fixing screw, it is advantageous to arrange the smooth surface (11) at right angles to the journal axis (4).

FIG. 8 shows a perspective view of a journal carrier similar to the embodiment according to FIGS. 6 and 7. However, the smooth surface (13) in this case is formed in a wedge shape, that is, as a surface that converges toward the shaft. Each of these smooth surfaces (13) extends at an angle of inclination (a) with respect to the shaft, the angle being between 4 ° and 8 °.
It is set to a value between 0 ° and more preferably to a value between 5 ° and 6 °. Therefore, in this case, the flange (6) itself can be compared with a cross key. Also in this embodiment, the connection between the two is made by a screw penetrating the arrow fixing hole (9).

As is apparent from FIG. 9, the shaft (14) is provided on the wedge-shaped surface (13) formed on the journal entrainment body.
Taper-shaped surfaces (13a) thereof face each other. The depth dimension of the recessed portion (15) formed on the shaft (14) is preferably such that the end surface as the mounting surface (7) of the flange (6) abuts the bottom surface of the recessed portion (15). It is set not to. The axial force generated by the screw engaged on the bottom surface of the recessed portion (15) is the smooth surface (13), (1) of the journal entrainment body (1) and the shaft (14).
Since the pressing force between 3a) is sufficiently increased to prevent mutual separation of smooth surface areas that are not loaded during torque transmission, occurrence of fine movement wear (fretting) is avoided. . Further, according to such a key coupling system, it is possible to prevent the parts from being dissociated during operation.

As shown in FIGS. 1 and 8, the journal carrier (1) has a recess (12) in the area between the journals (3) on the side facing the interior of the joint. Such a recessed part (12) can be provided in the relevant part because the load applied to the journal driver is small in this part, that is, the force flow is from the journal (3) to the central part (2). It is based on being directed inside. If a recess (12) of this kind is provided, the journal axes of both journal drive bodies can be arranged close to each other, so that, for example, two journal drive bodies of the same type can be connected to each other in a joint not shown. Particularly advantageous results are obtained when trying to place them face-to-face. Furthermore, this measure also contributes to reducing the structural length of the joint.

FIG. 10 shows the journal carrier viewed in the direction of the journal axis (4). As is apparent from the figure, the outer surface on the left side of the central portion (2) is a flange (6).
And the journal (3) form part of the outer peripheral surface of the cone. The conical axis (16) intersects the axis of rotation (5) at an angle (b) and extends at right angles to the journal axis (4). The axis of rotation (5) thus forms with the cone axis (16) a normal plane to the journal axis (4). The tip of this virtual cone is located outside the end face (7) of the flange (6) facing the shaft.
The journal (3) has a circular outer contour (19), the partial-conical outer peripheral surface (17) and the journal surface (1).
9) there is a transition surface (18) which can be formed substantially flat, as also shown in FIGS. 1 and 8. The outer surface shown symmetrically on the right side of FIG. 10 is also part of the outer surface of the conical cone, the axis (16) of which is on the left side of the axis of rotation (5) with respect to the axis of rotation (5) (b). However, this is not shown for the sake of clarity. The end face (20) in the drawing plane of the central part (2) is a flat normal plane to the journal axis (4), as also shown in FIGS. 1 and 8.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a journal carrier.

FIG. 2 is a bottom view of the journal entrainment body as viewed in the rotation axis direction.

FIG. 3 is a view of the bottom surface portion of FIG. 2 viewed in the direction of the arrow.

FIG. 4 is a plan view of the radial serration formed on the bottom surface.

5 is a side view of the bottom portion according to FIG.

FIG. 6 is a diagram showing a configuration of flanges having smooth surfaces parallel to each other.

FIG. 7 is a side view of the flange according to FIG.

FIG. 8 is a perspective view showing a configuration of a flange having a tapered smooth surface,

FIG. 9 is a perspective view showing a configuration of a shaft end portion having a tapered smooth surface.

FIG. 10 is a schematic view of the journal carrier viewed in the direction of the journal axis so that the outer contour of the central part is shown.

[Explanation of symbols]

 1 short dimension journal driver, 2 central part, 3 journal, 4 journal axis, 5 rotation axis, 6 flange, 7 mounting surface, 8 cross key, 8a vertical axis, 9 fixing hole, 10 radial serration, 11 smooth Surface, 12 concave part, 13 wedge surface, 13a tapered surface, 14 shaft, 15 concave part, 16 conical axis line, 17 part-conical outer peripheral surface, 18 transition surface, 19 external contour, 20 end surface.

Claims (13)

[Claims] 1. A journal entrainer for a propeller shaft, the propeller shaft being arranged between a drive shaft or a driven shaft for transmitting torque and a vibrating center part of a cardan joint. In the form of being journaled in a movably and oscillating central part by at least one journal extending along a journal axis centered on the journal axis lying at right angles to the axis of rotation of the shaft Is a flange (6) for fixing to an end surface of a drive shaft or a driven shaft (14), a central portion (2) centrally connected along a rotation axis (5) of the propeller shaft, and a propeller shaft Two jigs with a common journal axis (4) extending perpendicular to the axis of rotation (5) A journal (3), in which case the flange (6), the central part (2) and the journal (3) are combined as an integral unit (1). . 2. The shaft (1) of the flange (6), wherein the flange (6) has a larger diameter than the central portion (2).
4. The journal drive according to claim 1, characterized in that a solid cross key (8) for transmitting torque is integrally molded on the side facing 4). 3. A recessed portion having a shape corresponding to the shape of the cross key (8) is formed on a corresponding surface of the shaft (14) arranged to face the cross key (8), and the flange is formed. The journal drive according to claim 2, characterized in that the connection between the shaft (14) and the shaft (14) is made by screw connection on the end face side. 4. The journal axis (4) of the journal (3) extends at right angles to the longitudinal axis (8a) of the cross key (8) when viewed in the direction of the axis of rotation (4). The journal carrier according to claim 3. 5. The flange (6) has a plurality of perforations (9) for screw fastening, these perforations (9) as viewed in the direction of the axis of rotation (5). The journal drive according to claim 4, characterized in that it is arranged in the periphery between the longitudinal axis (8a) of 8) and the journal axis (4). 6. The flange (6) has radial serrations (10) on the side facing the shaft (14) and a plurality of fixing holes (9) used for axial fixing are provided on the flange. The journal-carrying body according to claim 1, wherein the journal-carrying bodies are symmetrically distributed to the peripheral portion. 7. The opposite sides of the flange (6) are formed as smooth surfaces (11) for engaging in corresponding surfaces of the same shape of the shaft (14), in which case both 2. The journal carrier according to claim 1, wherein the smooth surface (11) extends at right angles to the journal axis (4). 8. Journal drive according to claim 7, characterized in that the smooth surface (11) forms a plane parallel to the axis of rotation (5). 9. The journal carrier according to claim 7, wherein the smooth surface (13) extends in a wedge shape toward the shaft (14). 10. Journal entrainment according to claim 9, characterized in that each smooth surface (13) has an angle of attack between 4 ° and 8 ° with respect to the axis of rotation (5). body. 11. The flange (6) has a plurality of perforations (9) for screw fastening, which perforations (9) form a smooth surface (13a) on the shaft (14). 8. The structure according to claim 7, which is configured to engage with a perforated portion (9) provided on the bottom surface of the recessed portion (15).
A journal carrier according to any one of claims 10 to 10. 12. The central part (2) is formed between two journals (3) along the rotation axis (5) in a direction from the outer peripheral surface of the journal (3) to the journal axis (4). A journal carrier according to claim 1, characterized in that it is provided with one recess (12). 13. The outer contours of the central part (2) are located in pairs between the journals (3) and the flanges (6) and are located on opposite sides of each other, ie on the journal axis (4). ), Which is formed by two substantially flat end faces (20) extending parallel to the end face of the journal (3) in the normal plane to) and two curved outer faces each forming a part of the outer circumference of the cone. The virtual cone forming the outer peripheral surface is the axis of rotation of the journal driver (5)
With a cone axis (16) intersecting at an angle (b) with respect to and extending at a right angle to the journal axis (4) and a cone tip located outside the flange plane on the side facing the shaft (14). And its part in the area of the journal (3) -the conical outer peripheral surface (17) and the outer contour (1
13. A journal carrier according to any one of claims 1 to 12, characterized in that a transition surface (18) is formed between it and the surface (9).