JPH0516413Y2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention provides a drive shaft consisting of a male member and a female member that fit together so that they can slide in the axial direction but do not rotate relative to each other. The present invention relates to a drive shaft that can be connected to a female member in phase with each other. (Prior art and its problems) When connecting this type of male and female members,
To align the phases, a drive shaft is used that rotates one member relative to the other along a long helical groove. However, this drive shaft is made extra long for the purpose of forming a spiral groove for phase matching, which not only makes handling inconvenient but also increases the cost of the drive shaft. (Means for Solving the Problems) In order to solve these problems, the drive shaft of the present invention has a male member and a female member that can slide in the axial direction but are fitted together so that they do not rotate relative to each other. a drive shaft that is slidably housed in a center hole of the male member, has a pawl at the tip, and is attached to a guide pin of the male member so as to rotate around an axis when sliding within the male member; The male member is provided with a guide shaft in which a spiral groove is formed along the guide shaft, a spring that presses the guide shaft outward of the male member, and a protrusion for phasing the male member. a collar having a groove for accommodating the claw and fitting into a hole of the female member accommodating the male member; a spring for pressing the collar outward of the female member; and a spring for phasing the female member. A recessed portion is provided in the female member. (Function) When connecting the male member and the female member, by bringing the two members close to each other and pressing them, the claw at the tip of the guide shaft of the male member first engages with the groove of the collar of the female member. By further pressing both members, the guide shaft is rotated by the action of the helical groove, and the claw at the tip of the guide shaft completely fits into the groove of the collar of the female member. By further pressing both members, the guide shaft is further rotated by the action of the helical groove, thereby rotating the female member via the collar, and finally bringing the two members into phase. In this state, the protrusion of the male member and the recess of the female member are aligned in the axial direction, so that the two members can be completely connected by matching the phases. (Example) A case will be described in which the present invention is applied to a male member (shaft yoke) and a female member (sleeve yoke) having splines that connect a tractor and an agricultural machine. Male member 2 and female member 4 before being connected as shown in Figure 1
These members are connected to each other by splines 6 and 8, but as is clear from FIG. 1, the yoke portion 10 of the male member 2 and the yoke portion 12 of the female member 4 are The purpose of this invention is to correctly align the phase relationships that are shifted around the axis in a straight line, that is, to match the phases and connect them. The male member 2 has a guide shaft 14 in the central hole. As shown in Figures 1 and 2a, a flat pawl 16 is provided at the tip of the guide shaft 14. A spring 18 is provided within the center hole of the male member 2. A helical groove 20 is provided in the guide shaft 14, and a guide pin 22 fixed to the male member 2 is fitted into this groove 20. When the guide shaft is moved back and forth within the male member 2, the guide shaft 14 is aligned with its axis. Let it rotate around. In this example, the spiral groove spans 180°. A projection 24 is provided in the groove of the spline at a position that is diametrically aligned with the pawl 16 when the guide shaft 14 is freely projected by the spring 18. These effects will be explained later. The female member 4 is provided with a collar 26 having a guide groove that fits into the spline hole. This color 26
A groove 28 is provided in which the pawl 16 of the guide shaft 14 of the pushing member 2 fits. A spring 30 stronger than the spring 18 is placed in the spline hole of the female member 4, and the collar 2
6 is pressed outward. Color 26
The concave portion 32 is formed by cutting out the protrusion of the spline at a position that is diametrically aligned with the groove 28 . This recess is also formed for the female member 4. These effects will be explained later. Next, the operation of connecting the male member 2 and the female member 4 having the above configuration will be explained. As shown in FIGS. 2a and 2b, which are side views seen in the directions of arrows X and Y in FIG.
It is assumed that the female member 4 is also in a substantially vertical position and that the female member 4 is inclined by an angle α. Starting from this state, the female member is moved to the right as shown in FIG. 3, and the collar 26 is brought into contact with the pawl 16 of the guide shaft 14. Spring 1 inside male member 2
8 is weaker than the spring 30 inside the female member 4,
When the female member 4 is further moved to the right, the guide shaft 14
It retreats into the pushing member 2. In that case, the action of the helical groove 20 and the guide pin 22 causes the guide shaft 14 to
moves backward while rotating. When the rotation angle reaches the angle α, the pawl 16 of the guide shaft 14 enters the groove 28 of the collar 26. When the female member 4 is further moved to the right in FIG.
2, the guide pin 22 moves to the right in FIG.
are multiplied. At this time, the guide shaft has already rotated through an angle of 180°-α. In other words, the spiral groove 20
The total rotation angle is 180°. On the other hand, female member 4
Since the pawl 16 of the guide shaft 14 fits into the groove 28 of the collar 26, the collar 26 of the female member 4 rotates through an angle of rotation equal to the rotation angle of the guide shaft, that is, an angle of 180°-α. Since the collar 26 fits into the splines of the female member, the female member is also rotated through an angle of 180°-α. In this state, the protrusion 24 of the male member 2 and the guide shaft 1
The claws 16 of the female member 4 are in line, and the recess 32 of the female member 4 and the groove 28 are also in line.
That is, the phases of the male member 2 and the female member 4 match. As shown in FIG. 5, if the female member 4 is further pressed toward the male member 2 after the phases of the male member 2 and the female member 4 match, the spring 30 of the female member 4
is also compressed, and both parts are completely connected as shown in FIG. Therefore, the male member 2 and the female member 4 are connected to each other so that they can slide in the axial direction. Although the above explanation has been about a male member and a female member connected by a spline shaft, the invention can also be applied to a so-called lemon shaft consisting of a male member 34 and a female member 36 having a lemon-shaped cross section (see Fig. 8). reference). In addition, in the above explanation, the yoke of the Cardan joint is 180° symmetrical, and the projections 24 and recesses 32 for spline phasing are provided at two locations.
Depending on the number, the rotation angle of the guide shaft due to the spiral groove and the shape of the pawl 16 are as shown in the following table.

[Table] (Effects) Since the present invention is constructed as described above, it is possible to connect the male member and the female member by simply bringing them close to each other, aligning the phases of the two members, and the operation is extremely simple and easy. , and has the advantage of being reliable.
Further, the length of the drive shaft does not need to be particularly long for phase adjustment, and there is an advantage that it can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 shows the drive shaft of the present invention before connection, Fig. 2 a and b are side views seen in the direction of arrows X and Y in Fig. 1, respectively, and Fig. 3 shows the drive shaft of Fig. 1 connected. Figures 4a and 4b are side views seen in the directions of arrows X and Y in Figure 3, respectively, and Figure 5 shows the drive shafts in Figure 3 brought closer together to connect them. Figures 6a and b are side views seen in the directions of arrows X and Y in Figure 5, respectively, and Figure 7 shows the drive shaft in Figure 5 completely connected. Figure 8 is a sectional view of the lemon shaft, and Figures 9a, b, c, and d are schematic diagrams showing the shape of the claws of the guide shaft. 2... Male member, 4... Female member, 6, 8...
Spline, 10, 12... Yoke part, 14...
Guide shaft, 16...Claw, 18...Spring, 20...Spiral groove, 22...Guide pin, 24...Protrusion, 2
6...Color, 28...Groove, 30...Spring, 32
...Concavity.

Claims (1)

[Scope of utility model registration request] In a drive shaft consisting of a male member and a female member that are fitted together so that they can slide in the axial direction but do not rotate relative to each other, the male member is slidably housed in a center hole and has a claw at its tip. a guide shaft formed with a helical groove along the guide pin of the male member so as to rotate around an axis when sliding within the male member; and a guide shaft that is pressed outward of the male member. a collar that is provided with a spring and a protrusion for phasing the male member on the male member, has a groove that accommodates the pawl of the guide shaft, and that fits into a hole of the female member that accommodates the male member; A drive shaft characterized in that the female member is provided with a spring that presses the collar outward of the female member, and a recess for determining the phase of the female member.