JPS6325377Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a self-aligning joint for a concrete mixer housing in a concrete mixer truck.

[Conventional technology]

Conventionally, in a concrete mixer truck, a drum (concrete mixer housing) with one end open is supported between a pair of vertical members at a slight inclination from the horizontal. A large sprocket is attached to the bottom of the drum. Additionally, a small sprocket is attached to the output shaft of the reduction gear connected to a hydraulic motor or the like. A chain is wound between the large and small sprockets, and the drum is rotated by a hydraulic motor via a reduction gear and the chain, and the fresh concrete is transported to the construction site while being stirred by blades formed inside the drum. Such conventional concrete mixer trucks have large sprockets fixed to the drum, making them difficult and expensive to manufacture.

In order to eliminate these shortcomings, the special public
Publication No. 39219 proposes driving a concrete mixer housing and an actuator by directly connecting them with a self-aligning joint without using a sprocket or a chain. That is, the self-aligning joint described in this prior document has a head member having an outer spline on the outer peripheral surface and a spherical outer surface located on both sides of the outer spline, and a concave surface that slides into contact with one of the spherical outer surfaces of the head member. The first flange member has an inner spline that engages with the outer spline, and a second flange member has a concave surface that slides on the other spherical outer surface of the head member, and the first flange member is attached to the mixer housing. They are connected by bolts, etc.

With this configuration, since no sprocket or chain is used, manufacturing is relatively easy and equipment costs can be reduced. Moreover, this self-aligning joint allows the drum to rotate smoothly despite twisting of the drum that occurs during the mixing process of internal concrete due to drum rotation.

[Problem that the invention attempts to solve]

However, with this device, it is difficult to discharge the ready-mixed concrete in the drum when an actuator such as a reducer or a hydraulic motor breaks down while the drum is rotating and the drum stops rotating. That is, in the configuration described in the above-mentioned literature, the internal splines are formed directly on the flange member that connects to the mixer housing, so even if the bolts that connect the flange to the drum are removed, the engagement between the internal and external splines does not occur. I can't. For this reason, the drum slides using the circumferential surface of the flange member, which is not originally formed as a sliding guide surface, as a guide surface, and it is virtually difficult to rotate the drum smoothly manually.

In this way, the fresh concrete in the drum cannot be promptly discharged, and it is not possible to prevent the fresh concrete from hardening in the drum.

[Purpose of the invention]

The present invention is the direct type mentioned above,
Moreover, it is an object of the present invention to provide a self-aligning joint for a concrete mixer housing that allows ready-mixed concrete to be quickly discharged in the event of a failure.

[Means for solving problems]

The present invention achieves the above object by providing a self-aligning joint that connects a concrete mixer housing and an actuator, wherein the mixer housing has a shoulder portion, the head member of the self-aligning joint is connected to the actuator, and the outer peripheral surface has an outer spline and a spherical outer surface located on both sides of the outer spline, and a first flange member has a concave surface that slides against the spherical outer surface of one of the head members and is capable of fitting into a shoulder of the mixer housing. a second flange member has a concave surface slidingly in contact with the other spherical outer surface of the head member, and an intermediate flange member is sandwiched between the first and second flange members and The mixer housing has an inner spline that engages with the outer spline of the mixer housing, and bolts passing through the first, second, and intermediate flange members integrally connect the three members to the mixer housing, and the mixer housing can be detached by removing the bolts. This is achieved through self-aligning joints in the concrete mixer housing.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments of the present invention. FIG. 1 shows a side view of a concrete mixer truck equipped with a self-aligning joint for a concrete mixer housing according to the present invention. A drum 13 is rotatably supported. In FIG. 1, the drum 13 is open on the left side and closed on the right side to form the bottom. The bottom of the drum 13 is connected to an actuator 15 via a self-aligning joint 14 of the present invention.

That is, as shown in FIGS. 2 and 3,
The bottom of the right side of the drum 13 is cut down to a predetermined depth from the end surface 13c to form a recess 13b, and the recess 1
3b accommodates the tip of the self-aligning joint 14, and the bottom end surface 13c and the bottom surface 13d of the recess 13b.
A shoulder portion 13a is formed between the two.

A shoulder 28a of the first flange member 28 of the self-aligning joint 14 fits into this shoulder 13a.

Next, the self-aligning joint 14 of the present invention will be described in detail. Fig. 2 is an enlarged side view with a part of the self-aligning joint 14 in cross section. The actuator 15 shown in the figure comprises a hydraulic motor 16 and a reduction gear 17 connected to the hydraulic motor 16. A bracket portion 19 at the bottom of the reduction gear 17 is fixed directly to the body frame of the concrete mixer truck 11 or is fixed to the body frame of the concrete mixer truck 11 via a base, and the hydraulic motor 16 is secured to the body frame of the concrete mixer truck 11 by a bolt 1.
The head member 21 is integrally connected to the reducer 17 by a spline formed on an output shaft 20 of the reducer 17. The head member 21 has an external spline 22 that goes around the entire circumference of the head member 21 at the center of the outer periphery, and has spherical outer surfaces 23, 24 on both sides of the external spline 22. A collar 25 is provided between the reducer 17 and the head member 21.
The bolt 2 is screwed onto the tip of the output shaft 20.
6 fastens the contact plate 27 and fixes the head member 21 to a predetermined position on the output shaft 20 of the reducer 17.

The first flange member 28 and the second flange member 29 each have a recess that engages a spherical outer surface 23, 24 formed on the head member 21. Intermediate flange member 30 has internal splines that engage external splines 22 formed on head member 21 .

A predetermined number of screw holes 33 are formed in the bottom of the drum 13. Screw holes 3 are provided in the first flange member 28, the second flange member 29, and the intermediate flange member 30.
3 and the same number of bolt holes 34 are drilled, and the bolt holes 34 are
The first flange member 28, the second flange member 29, and the intermediate flange member 30 are attached to the drum 1 by inserting bolts 35 through them and screwing them into the screw holes 33 of the drum 13.
It is integrally attached to 3.

The bolt 35 shown in FIG. 2 is a so-called pin bolt consisting of a cylindrical portion and a threaded portion formed at the tip of the cylindrical portion. The cylindrical portion acts like a parallel pin to connect the first flange member 28 and the second flange member 2.
The threaded portion connects the first flange member 28 , the second flange member 29 and the intermediate flange member 30 to the drum 13 .

The rotational driving force of the hydraulic motor 16 is decelerated by a reducer 17 and then transmitted from an output shaft 20 to a head member 21, and is further transmitted to an outer spline 22 formed on the head member 21.
The inner spline 3 engaged with the outer spline 22 from
1 to the intermediate flange member 30, and further to the drum 13 via the bolts 35. As a result, the drum 13 is rotated at a predetermined rotational speed.

For some reason during operation, the hydraulic motor 16,
If a failure occurs in the reducer 17 or other drive system, loosen the bolt 35 and remove it from the drum 13.
The bolt engagement between the first flange member 28, the second flange member 29, and the intermediate flange member 30 and the drum 13 is released. First flange member 28 and drum 1
3 is engaged with the shoulders 28a and 13a and remains substantially integral, but is free from the second flange member 29 and the intermediate flange member 30. Accordingly, the drum 13 and the first flange member 28 integrally form the spherical outer surface 2 of the head member 21.
It becomes possible to slide around 3. Therefore, by wrapping a rope or the like around the body of the drum 13 and manually pulling the rope and rotating the drum 13 with a small force, it is possible to discharge the ready-mixed concrete inside the drum 13 without solidifying it.

In the embodiment shown in FIG. 2, the bolt 35 is 1
Different types of pin bolts were used. However, as shown in FIG. 3, the first flange member 28, the second flange member 29, and the intermediate flange member 30 are
bolts 36 for fastening to the third flange, and parallel pins 37 that bear the shearing force between the first flange member 28, the second flange member 29, and the intermediate flange member 30.
may be used to improve the workability of the pin hole for inserting the parallel pin. Note that 38 is a screw hole into which a extraction bolt (not shown) is screwed when removing the parallel pin 37.

[Effect of idea]

This invention takes advantage of the fact that the spherical surface of the self-aligning joint is usually finished to an extremely smooth surface to enable the rocking motion of the drum, and is used to prevent failures in actuators such as hydraulic motors and speed reducers. When this occurs, the bolts are removed, a rope or the like is hung around the drum, and the drum is made rotatable using the spherical surface as a guide surface, making it possible to quickly discharge the fresh concrete inside the drum.

[Brief explanation of the drawing]

Fig. 1 is a side view of a concrete mixer truck equipped with a self-aligning joint for a concrete mixer housing according to the present invention, and Fig. 2 is an enlarged side view showing a partial cross section of an embodiment of the self-aligning joint of the present invention. figure,
FIG. 3 is a partially enlarged sectional view of another embodiment of the self-aligning joint of the present invention. 11... Concrete mixer truck, 12... Vertical support member, 13... Drum, 14... Self-aligning joint, 15... Actuator, 16... Hydraulic motor, 17... Reduction gear, 20... Output shaft, 21...
...Head member, 22...Outer spline, 23, 24...
... Spherical outer surface, 28 ... First flange member, 29
... second flange member, 30 ... intermediate flange member, 31 ... internal spline, 35, 36 ... bolt, 37 ... parallel pin.

Claims (1)

[Scope of utility model registration request] In a self-aligning joint that connects a concrete mixer housing and an actuator, the mixer housing has a shoulder portion, a head member of the self-aligning joint is connected to the actuator, and an outer spline and an outer spline are formed on the outer peripheral surface of the self-aligning joint. a first flange member having spherical outer surfaces located on both sides, a first flange member having a concave surface slidingly contacting one of the spherical outer surfaces of the head member and a shoulder portion fitable to a shoulder portion of the mixer housing; two flange members have a concave surface that slides on the other spherical outer surface of the head member, and an intermediate flange member has a concave surface that slides on the other spherical outer surface of the head member;
an inner spline sandwiched between the flange members and engaged with an outer spline of the head member;
A self-aligning joint for a concrete mixer housing, characterized in that the three members are integrally connected to the mixer housing by bolts passing through the first, second and intermediate flange members, and can be separated by removing the bolts. .