CN105171688B

CN105171688B - Assembly tool for a threaded connection between a brake pipe and a connection assembly

Info

Publication number: CN105171688B
Application number: CN201510263312.6A
Authority: CN
Inventors: 胡柏图斯·冯·查普伊; 埃里克·格赖斯; 马克·迈莱
Original assignee: Ford Global Technologies LLC
Current assignee: Ford Global Technologies LLC
Priority date: 2014-05-21
Filing date: 2015-05-21
Publication date: 2020-02-07
Anticipated expiration: 2035-05-21
Also published as: CN105171688A; DE102015206397A1; BR102015011575A2

Abstract

The invention relates to an assembly tool (1) for a threaded connection between a brake pipe (3) and a connecting assembly, in particular a brake hose. For this purpose, the assembly tool (1) comprises a base body (5) with a swivel insert supported so as to be rotatable about a longitudinal direction (a). The rotary insert has a channel with an inner contour extending in the longitudinal direction (a). The rotary insert can be driven and can engage with a brake pipe nipple of the brake pipe (3) by means of an inner contour for the transmission of torque. According to the invention, a holding device (6) can be provided, which is designed to hold the brake pipe (3) in place during rotation of the rotary insert for transmitting torque to the brake pipe connection.

Description

Assembly tool for a threaded connection between a brake pipe and a connection assembly

The invention relates to an assembly tool for a threaded connection between a brake pipe and a connecting assembly, in particular a brake hose, according to the preamble of claim 1.

The threaded connection is used for detachable connection of the components. A positive-locking based connection requires at least one thread. This can be screwed into a matching thread provided or self-tapping into the bore of the connection assembly. Due to the pitch of the thread, its rotation about the longitudinal direction translates into a corresponding axial force. Depending on the level of torque applied, the positive locking is thereby assisted by the self-tightening threaded friction connection. The elastic tension generated in this way counteracts the possible tendency of the connection to loosen.

The lines and hose connections can be joined and/or connected together by means of a threaded connection in the form of a threaded joint for transporting fluids. Since such a connection needs to be tight, it is usual in this case for the two sealing surfaces of the connecting lines to bear against one another. For this purpose, the free end of the pipe may have, for example, a conical expansion (flare)

) The coupling member is pressed with the coupling member against a sealing surface of a coupling assembly, for example a brake hose, which abuts the pipe. Depending on the particular purpose, it is possible to transport fluids and at the desired fluid pressure, such threaded connections may be sealed by suitable sealing or simply by metal-to-metal contact.

A braking system utilized in a vehicle includes a transmission and a drive interconnected by a fluid-carrying brake circuit. These devices are operated primarily hydraulically or pneumatically. The separate fluid line consists of a rigid brake pipe and a flexible brake hose. The brake pipe is here arranged generally on the vehicle body. In contrast, brake hoses are used to attach a brake pipe to an actuator of a drive device, which is arranged, for example, on a mobile chassis component in the form of a brake caliper and a brake cylinder.

The threaded coupling in the brake circuit relies on a brake pipe having an end flare. The brake hose, on the other hand, has a corresponding end piece with an internal seat. In order to make the sealing surface larger, the shoulder of the respective flared section and the seat of the end piece may be inclined, in particular of conical design.

In order to obtain a sealed connection, the brake pipe must have the sealing surface of its flared portion pressed against the sealing surface of the inner seat of the end piece. For this purpose, the movable engagement member is arranged around the separate brake pipe. The engagement member can preferably take the form of a threaded union nut. The union nut advantageously has an engagement surface for coupling to a suitable tool. It is clear that the development of various designs for union nuts is feasible, especially with regard to the threads required for the thread joints. For example, the union nut may have internal or external threads, while the coupling assembly corresponding to the union nut has mating threads that mate therewith.

In the context of the present invention, the pipe connection thread described herein may also be referred to simply as a pipe connection or brake pipe fitting.

The brake pipe connection has a thread, for example an external thread. The brake pipe nipple also has an outer contour, for example in the form of at least one engagement surface. The purpose of the outer profile is to allow the application of torque by means of a tool that can be engaged with the outer profile. On the other hand, the end piece of the attached brake hose has a corresponding mating thread, for example an internal thread. Thus, by rotating it, the brake pipe nipple can be tapped into or screwed onto the end piece of the brake hose. By so doing, the flared portion of the brake pipe is engaged between the end surface of the brake pipe joint and the sealing surface of the inner seat. In this way, as the torque increases, the sealing surfaces of the brake pipe and the brake hose are pressed against each other more firmly.

Special assembly tools for the threaded connection of brake pipes and brake hoses are known. These are used to apply torque to the brake pipe joint. For such purposes, the assembly tool typically includes an electrically or pneumatically driven rotary insert (dreheinatzes) that is capable of engaging the brake pipe joint. The assembly tool described here is preferably of slotted design in such a way that it can be mounted more or less transversely to the brake pipe and brought into engagement with the brake pipe nipple by a subsequent longitudinal displacement of the brake pipe.

With regard to the assembly tool, the patent document US 5432968A discloses a universal tool that combines various individual tools into one. Here, the separate tool can be folded compactly in the form of a small folding knife into the hollow shaft or at least partially supported thereby. The separate tools here comprise an adjustment wrench as well as a tube wrench and a blade and at least one screwdriver.

Patent document CN 201900569U discloses an assembly tool comprising two interconnected pairs of jaws. One of the pairs of jaws is a clamping jaw, the clamping of which can be adjusted in terms of the width of the clamping area by means of a screw. The respective hinge points of the two pairs of jaws are connected to each other in axial alignment by a shaft. Here at least one of the pair of jaws is pivoted to the shaft in such a way that the pair of jaws can be moved closer to the other pair of jaws by sliding axially on the shaft. The two pairs of jaws are spaced apart from each other by a helical spring arranged around the shaft.

DE 19832363C 1 shows a multifunctional tool with which a plurality of functions can be carried out in a short time and without difficulty. For this purpose, the tool comprises an arm element, similar to a pliers, whose rear end is connected to a piston-cylinder drive unit. An operable tool element is also provided on the front end of the arm element. In the central region, each arm element has a guide groove to which the sliding unit of the drive is assigned. The drive means here comprise two co-acting cylinders with the arm member arranged between them.

Since the vehicle brake system is a safety-critical unit, its tightness must be ensured even after an extended service life.

In practice, it has now been recognized that such threaded connections can sometimes become loose even after a short time due to their loosening, even if a sufficient pretension is applied by means of a suitable assembly tool. Thus, up to now, the assembly tool for the threaded connection of the brake circuit clearly provides room for improvement.

Against this background, the object of the present invention is to further develop an assembly tool for a threaded connection between a brake pipe and a connecting assembly, so that the threaded connection thus achieved offers increased safety against loosening.

According to the invention, this object is achieved by an assembly tool having the features of claim 1. Furthermore, particularly advantageous developments of the invention are disclosed by the respective dependent claims.

It should be noted that the features mentioned separately in the following description may be combined with each other in any technically appropriate manner and thus give further developments of the invention.

According to this, the assembly tool comprises a base body with a rotary insert. The rotary insert is supported in or on the base body so as to be rotatable about the longitudinal direction by suitable drive. The swivel insert has a longitudinally extending channel with an inner profile. The inner contour is intended to engage at least some area of the brake pipe nipple for transmitting torque. Where the inner profile of the swivel insert and the outer profile of the brake pipe nipple engage. The assembly tool according to the invention further comprises a holding device. The retaining means is designed to hold the brake pipe in place while rotating the swivel insert for transferring torque to the brake pipe nipple when the swivel insert and the brake pipe nipple are in an engaged state.

In other words, the invention provides an additional retaining means, the purpose of which is to temporarily fix the brake pipe against possible twisting when torque is applied to the brake pipe nipple. In this way, a possible twisting of the brake pipe during the transmission of torque is limited by the short section between the holding device and the free end of the brake pipe, which can be, for example, flared and in direct contact with the brake nipple rotating in the process.

This has the advantage that a range is currently provided for preventing, during screwing, twisting of the brake pipe over its entire length, which would lead to loosening of the connection. This illustrates the fact that the cause of such loosening of the threaded connection arises from a previous twisting of the brake pipe, as has been observed in practice. This is caused by an undesired twisting of the brake pipe when torque is applied to the brake pipe joint. Such twisting is caused by frictional contact between the end face of the brake pipe joint and the flared portion at which one end of the brake pipe is disposed. As a result, uncontrolled rotation of the brake pipe can also occur during the assembly (rotation) of the brake pipe nipple. In particular, in unfavorable friction states, undesirable and hitherto unrecognized torsional torques are thereby applied to the brake pipe, which disadvantageously weakens the threaded connection in the subsequent assembly. As a result of this torsional moment, the brake pipe joint thus loaded by frictional contact with the brake pipe flare exhibits a tendency to swivel, counteracting the applied torque.

The threaded connection produced in this way provides a significantly increased safety against loosening by means of the inventive device for reliably avoiding a possible twisting of the brake pipe and of the brake pipe connection.

It has to be emphasized that the connecting assembly connected to the brake pipe may not only be a brake hose. For example, the connecting assembly may be configured substantially as other embodiments, such as a brake cylinder or another hydraulic system, for example. The design of the connection assembly is irrelevant, since the assembly tool according to the invention is essentially in contact with the brake pipe and the associated brake pipe nipple.

According to a particularly preferred development of the basic idea of the invention, the holding means can be mounted on the base body. The retaining device is preferably arranged on the basic body in such a way that, in the transmission of torque, at least some regions of the part of the brake pipe located outside the channel can be fastened by the retaining device. This offers the advantage that the brake pipe can be oriented in terms of its position about its longitudinal axis by means of the retaining means on the base body of the assembly tool.

In this way, the personnel using the assembly tool can now check to ensure that the brake pipe is in fact not rotating. For this purpose, the make-up tool must be applied to the threaded connection and held without any torsion around the brake pipe when torque is applied. Since the holding device is coupled to the base body, the position of the brake pipe relative to the rotation about its longitudinal axis is currently determined by the orientation of the base body.

By virtue of these features, the assembly tool according to the invention achieves two functions, namely that the assembly of the brake pipe nipple to the flared portion of the brake pipe free end is firmly seated, while the brake pipe is secured against twisting.

In an advantageous development of the invention, the holding device can comprise at least two pliers heads (back) which can be moved relative to one another. The purpose of the holding device jaw is to contact a portion of the area of the brake pipe. Here, the two jaws define a clamping area between them. The clamping area of the holding device more preferably corresponds to the passage of the rotary insert. In other words, the clamping region of the holding device can advantageously be aligned on the passage of the rotary insert in such a way that the brake pipe, which is arranged through the passage, can be simultaneously fastened by the holding device so that it is secured against twisting.

According to the invention, the holding device preferably comprises at least two opposing arms. Alternatively, the arms of the holding device are arranged in such a way that they cross each other. This provides a design similar to the clip arms. More preferably, the arms are suitably pivotally connected to each other by hinge points. Such a configuration of the retaining device advantageously allows to use the arm there to exert a retaining action on the brake pipe.

In a particularly preferred development of the invention, each arm of the holding device comprises a first lever arm and a second lever arm. A separate lever arm may advantageously extend from the free end of each arm to the hinge point. In this regard, the arms may be coupled together by hinge points in regions remote from their respective free ends.

This results in a forceps-like arrangement of the holding device.

Due to the fact that the lever arm is formed at the location of the hinge point, these can be used advantageously so that the retaining action on the brake pipe can be exerted by using only slight forces. On the other hand, the lever arm can be designed so as to obtain an extremely precise clamping action on the brake pipe. This reduces the risk that the brake pipe may break. The precise adjustment of the lever arm required is subject to the provisions of the person skilled in the art who will make the corresponding configuration based on the clamping force applied by the brake pipe and the holding means.

According to a preferred development of the inventive assembly tool, each binding clip of the holding device is arranged on one of the first lever arms. Alternatively, each of the binding heads may be formed on one of the first lever arms. The two pliers heads are thus advantageously located on the opposite first lever arm. In this way, a clamping area is established between the two first lever arms of the pivotably connected arm of the holding means.

According to a particularly preferred development of the assembly tool according to the invention, the holding device can be provided with a drive. The holding device can be operated by the drive in such a way that the clamping area of the holding device can be opened and/or closed by the drive. By using a suitable drive, the person using the assembly tool can advantageously operate the holding device without difficulty. This provides a facility for the corresponding control drive, so that the applied clamping force is, for example, electronically preset and/or monitorable, so that possible breaking and thus damage to the brake pipe is prevented.

According to a preferred development of the invention, a linearly movable pin can also be provided. The pin can be more preferably connected to the driver, so that the pin can be moved linearly by the driver. The purpose is to allow the pin to be placed between the two second lever arms of the holding device. In this case, the pin is preferably in contact with both second lever arms, at least in some areas. Alternatively or additionally, the pin here does not require any continuous contact with the second lever arm, so that for example the pin can make such contact with the second lever arm only when required. The second lever arms can advantageously be aligned in a V-shape relative to each other at least in sections in such a way that they can be pivoted about the hinge point by a linear movement of the pin.

In other words, for example, the two second lever arms can be pivoted about the hinge point by a linear movement of the pin guided between these and at the same time be separated from one another in such a way that the clamping region of the holding device is thereby opened or closed.

Such a configuration is also possible today, for example, with existing pliers tools as holding devices. Its second lever arm, which is a shank, must here be oriented so that the pin moves between them. These may take the form of, for example, flat pliers.

With regard to the actuator, the invention proposes that it be actuated by a fluid. The drive may thus be a pneumatic or hydraulic drive, for example. Alternatively, the driver may also be electrically operated. Possible electrically operated drives may be of electromagnetic design.

The use of linearly movable pins for operation of the holding device makes it possible to utilize a wide range of drives. Finally, this can be adapted, for example, to the local environment with respect to the possible supply. Here, for example, connectionless operation is also possible, which can be achieved, for example, by means of a suitable energy accumulation of the drive.

In order to allow an arrangement for applying pure torque to the brake pipe joint which is as simple as possible and which can be combined with existing tools, according to a preferred development of the invention at least one mounting plate is provided. In this way, the holding device can be placed on the base body by means of the mounting plate. Such tools are known, for example DC (direct current) tools.

The invention currently allows the production of a durable connection between the brake pipe and the brake hose by means of the described assembly tool. This is effective, inter alia, for preventing possible twisting of the brake pipe during application of torque to the brake pipe joint. The holding device according to the invention for this purpose is used for the controlled fixing of the brake pipe during assembly. As a result of which such a threaded connection can now be reliably assembled in production.

Further advantageous detailed descriptions and effects of the invention are explained in more detail below with reference to at least one exemplary embodiment which is schematically represented in the drawing, wherein:

fig. 1 shows a top view of a first variant of an assembly tool according to the invention in an open state immediately before and after assembly;

FIG. 2 shows a second variant of the closed state of the assembly tool of FIG. 1 during assembly, presented in the same manner, according to the invention;

FIG. 3 shows the assembly tool of FIG. 2 incorporating a driver in accordance with the present invention; and

fig. 4 shows a side view of the assembly tool of fig. 1 to 3 according to the invention.

List of reference numerals

1 assembling tool

2 threaded connection

3 brake pipe

4 connecting assembly, such as brake hose

5 base body

61 holding device

71 assembly plate

86 first arm

96 second arm

10 hinge point between 8 and 9

118 first lever arm, short

129 first lever arm, short

138 second lever arm, long

149 second lever arm, long

158 of the first free end

169 first free end

178 second free end

189 second free end

198 of the utility model

209 nipples

2113. 14 between the pins

225 supply line

236 driver

2423 coupling rod between 21

253 brake pipe joint (Bremsleitungsippel)

264 of a medical device

273 and 4

a longitudinal direction

B channel

Clamping area between C19 and C20

direction of d 21

Fig. 1 shows an assembly tool 1 according to the invention, which is suitable for the production of a threaded connection 2 between a brake pipe 3 and a connecting assembly, in an exemplary development a brake hose 4, which is represented in detail in fig. 4.

The assembly tool 1 comprises a basic body 5 of an existing torque tool, in particular a DC tool, which is shown here only with dashed lines. Supported in the base body 5 is a rotary insert (not shown in detail) which can be rotated about a longitudinal direction a out of the plane of the page by means of a drive, which is likewise not shown. The rotary insert has a channel B extending in the longitudinal direction a and has an inner contour which is not shown in detail.

A holding device 6 like a pair of pliers fixed to the base body 5 by a fitting plate 7 is placed on the base body 5. The top view of the assembly tool shown here shows that both the threaded connection 2 and the brake hose 4 are concealed by the retaining device 6. According to a variant of the first design shown here, the retaining means 6 comprise a first arm 8 and a second arm 9, which cross each other. The two

arms

8, 9 are connected together by a hinge point 10.

It can be seen that the holding device 6 is designed to hold the brake pipe 3. The inner contour of the channel B is here intended for engagement with a brake pipe nipple (not shown because it is hidden) of the brake pipe 3 for transmitting torque. In this way, the brake pipe 3 can be held by the holding device 6 while the swivel insert is turned for transmitting torque to the brake pipe joint.

The profile and leverage ratio of the

arms

8, 9 of the holding device 6 determine the clamping force and kinematics required by the system. Each of the two

arms

8, 9 of the holding device 6 comprises a short

first lever arm

11, 12 and an opposite long

second lever arm

13, 14. Here each of the lever arms 11-14 extends from the free ends 15-18 of the two

arms

8, 9 to the hinge point 10. The holding device 6 further comprises two

jaws

19, 20 which are movable relative to each other, each formed on one of the two short

first lever arms

11, 12.

It can be seen that the clamping areas C of the holding means 6 between the

opposite jaws

19, 20 are aligned in the longitudinal direction a so that this corresponds to the passage B of the swivel insert.

A pin 21 is further provided which is linearly movable in the direction d towards the longitudinal axis direction a. The pin 21 is here arranged between the two long

second lever arms

13, 14 of the holding device 6. At the same time, the pin 21 is in contact with the long

second lever arm

13, 14 at least in some areas. The long

second lever arms

13, 14 are at least partially V-aligned relative to each other at least towards their free ends 17, 18 in such a way that these can be pivoted about the hinge point 10 by linear movement of the pin 21 in the direction d in the longitudinal direction a. Here, it serves to close the clamping area C of the holding device 6.

The clamping area C can be opened again by running the pin 21 back. For this purpose, the two

arms

8, 9 of the holding device 6 can be separated from each other in a manner not shown in detail, for example by spring elements, in such a way that the clamping area C can be opened again more or less automatically when the pin 21 runs back.

Fig. 2 shows the assembly tool in a holding state (clamping function) during assembly. The linear movement of the pin 21 in the direction d in the longitudinal direction a shown here produces the closing of the clamping area C.

Fig. 3 again shows a further illustration of the assembly tool 1 according to the invention. In this illustration, the substrate 5 is now fully visible. It has a supply line 22 at the end of the base body 5 opposite the channel B. The supply line 22 may be, for example, a power cable. In this case, a driver 23 is provided, in contrast to what is presented in fig. 1 and 2. The holding device 6 is here coupled to the drive 23. In this way, the holding device 6 is operated by the drive 23 in such a way that the drive 23 is able to close the clamping area C of the holding device 6. For this purpose, the pin 21 is connected to a driver 23 by means of a coupling rod.

In this case, the driver 23 is electromagnetically driven. Alternatively or additionally, this may obviously also be driven by pneumatic or other forms of energy.

Fig. 4 shows a side view of an assembly tool 1 according to the invention. It can be seen that a total of two mounting plates 7 are provided which enclose the retaining device 6 between them. The brake hose 4 and the brake pipe connection 25 can now be clearly seen. The brake pipe nipple 25 is arranged in the form of a union around the brake pipe 3 and is screwed into the end piece 26 of the brake hose 4.

From this view it is clear that the retaining means 6 are arranged on the basic body 5 in such a way that, while transmitting torque, a part of the brake pipe located outside the channel B can be fastened at least in some areas by the retaining means 6, so that a threaded connection 27 is created.

Claims

1. An assembly tool for a threaded connection (27) between a brake pipe (3) and a connection assembly, comprising a base body (5) with a rotary insert which is supported so as to be rotatable about a longitudinal direction (a) and has a channel (B) extending in the longitudinal direction (a) with an inner contour, wherein the rotary insert can be driven and can engage with a brake pipe nipple (25) of the brake pipe (3) via the inner contour for the transmission of torque,

it is characterized in that the preparation method is characterized in that,

a holding device (6) designed to hold the brake pipe (3) in place when the rotary insert is rotated for transmitting torque to the brake pipe nipple (25),

the holding device (6) is arranged on the base body (5) in such a way that at least some regions of a part of the brake pipe (3) located outside the channel (B) can be clasped by the holding device (6) during torque transmission.

2. The assembly tool according to claim 1, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

the holding device (6) comprises at least two jaws (19, 20) which are movable relative to one another, wherein a clamping region (C) of the holding device (6) located between the jaws (19, 20) corresponds to the passage (B) of the rotary insert.

3. The assembly tool according to claim 1, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

the holding device (6) comprises at least two opposing or intersecting arms (8, 9) which are connected together by a hinge point (10).

4. The assembly tool according to claim 3,

it is characterized in that the preparation method is characterized in that,

each of the arms (8, 9) of the holding device (6) comprises a first lever arm (11, 12) and a second lever arm (13, 14), wherein the lever arms (11-14) extend from a free end (15-18) of each arm (8, 9) to the hinge point (10).

5. The assembly tool according to claim 2, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

each of the jaws (19, 20) of the holding device (6) is arranged or formed on one of the first lever arms (11, 12).

6. The assembly tool according to claim 2, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

an actuator (23), wherein the holding device (6) can be operated by the actuator (23) in such a way that the clamping region (C) of the holding device (6) can be opened and/or closed by the actuator (23).

7. The assembly tool of claim 6, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

a pin (21) which can be moved linearly by means of an actuator (23) and is arranged between the two second lever arms (13, 14) of the holding device (6) and at least in some regions is or can be brought into contact with these, wherein at least some sections of the second lever arms (13, 14) are aligned in a V-shape relative to one another in such a way that they can be pivoted about a hinge point (10) by means of the linear movement of the pin (21) and thereby open and/or close a clamping region (C) of the holding device (6).

8. The assembly tool of claim 6, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

the actuator (23) can be electromagnetically driven or driven by a fluid.

9. The assembly tool of claim 8, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

the drive (23) is hydraulically or pneumatically driven.

10. The assembly tool according to claim 1, wherein the tool is a tool,

it is characterized in that the preparation method is characterized in that,

the holding device (6) is attached to the base body (5) by means of at least one mounting plate.