Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HYDRAULIC QUICK CONNECTOR
Document Type and Number:
WIPO Patent Application WO/2019/025296
Kind Code:
A2
Abstract:
The invention relates to a hydraulic quick connector comprising: – a coupling sleeve having a coupling end and an opposite connection end for connection with a fluid line; – a nipple having an insertion end and a connection end for connection with a fluid line, which nipple is insertable with the insertion end into the coupling sleeve at the coupling end; and - a releasable lock for blocking the nipple in an inserted position, wherein the nipple is inserted into the coupling sleeve; and - an electric contact ring for ensuring electrical contact between the coupling sleeve and the nipple in the inserted position, which contact ring is mounted in a circumferential groove arranged in the coupling sleeve, wherein the contact ring is a coiled wire having at least one winding with a discontinuous curvature.

Inventors:
PUNDE, Dipak (Tulsi Landmark, Moshi pradhikaran Sector-11, Pune 6, 411026, IN)
PHALLE, Vijay (FL-12, Avadhoot Residency Moshi Pradhikaran, Pune 5, 412105, IN)
MEIDLEIN, Jochen (Pullacher Platz 7, Munich, 81371, DE)
KIERNAN, Gregory (685 Church Street, Grass LakeMichigan, 49240, US)
NAGPURE, Sameer (Flat No04, Wing-BUnique Enclave, S.No. 168/1A, 168/2, Sadesatara Nali, Near Suzlon Company Hadapsar, Pune 8, 411028, IN)
WARAD, Nilesh (8Premdham, Housing Society Gokhale Road, Near E Square, Shivaji Nagar, Pune 6, 411016, IN)
AHER, Ravi (Deepratna Bungalow, Plot no 6Ashtavinayak Nagar, Amrutdham, Panchavati, Nashik 3, 422003, IN)
Application Number:
EP2018/070354
Publication Date:
February 07, 2019
Filing Date:
July 26, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
EATON INTELLIGENT POWER LIMITED (30 Pembroke Road, Dublin, 4, 4, IE)
International Classes:
F16L25/01; F16L37/23; H01R4/60
Attorney, Agent or Firm:
EATON IP GROUP EMEA (Route de la Longeraie 7, 1110 Morges, 1110, CH)
Download PDF:
Claims:
Claims

1. Hydraulic quick connector comprising:

- a coupling sleeve having a coupling end and an opposite connection end for connection with a fluid line;

- a nipple having an insertion end and a connection end for connection with a fluid line, which nipple is

insertable with the insertion end into the coupling sleeve at the coupling end; and

- a releasable lock for blocking the nipple in an inserted position, wherein the nipple is inserted into the coupling sleeve;

characterized by

- an electric contact ring for ensuring electrical contact between the coupling sleeve and the nipple in the inserted position, which contact ring is mounted in a

circumferential groove arranged in the coupling sleeve, wherein the contact ring is a coiled wire having at least one winding with a discontinuous curvature.

2. Hydraulic quick connector according to claim 1, wherein the coiled wire has straight portions connected by bent portions.

3. Hydraulic quick connector according to claim 2, wherein the straight portions are of equal length and wherein the bent portions are of substantially equal shape, such that the electric contact ring has in axial view a polygonal shape.

4. Hydraulic quick connector according to any of the preceding claims, wherein the diameter of the inscribed circle of the coiled wire is smaller than the outer diameter of the insertion end of the nipple.

5. Hydraulic quick connector according to any of the preceding claims, wherein the diameter of the circumscribed circle of the coiled wire is smaller than the diameter of the bottom of the circumferential groove and larger than the inner diameter of the coupling end of the coupling sleeve.

6. Hydraulic quick connector according to claim 5, wherein the thickness of the wire is equal or larger than the depth of the circumferential groove.

7. Hydraulic quick connector according to any of the preceding claims, wherein the insertion end of the nipple has a rounded leading edge.

Description:
Hydraulic quick connector

The invention relates to a hydraulic quick connector comprising:

- a coupling sleeve having a coupling end and an opposite connection end for connection with a fluid line;

- a nipple having an insertion end and a connection end for connection with a fluid line, which nipple is

insertable with the insertion end into the coupling sleeve at the coupling end;

- a releasable lock for blocking the nipple in an inserted position, wherein the nipple is inserted into the coupling sleeve.

Hydraulic quick connectors are widely known and used for connecting hydraulic lines, which also require to be disconnected. Typically such quick connectors have a

releasable lock with an axially movable operating sleeve, which allows or blocks balls arranged in the coupling sleeve, which balls also protrude in a groove of the nipple, such that the nipple can be locked in the coupling sleeve and can be released by moving the operating sleeve allowing the balls to move out of the groove in the nipple and allowing the nipple to be retracted from the coupling sleeve. However other releasable locks are also known for hydraulic quick

connectors .

For certain applications it is required that the hydraulic lines are hydraulically connected but also

electrically connected, for example in automotive

applications. With typical hydraulic quick connectors, rubber seals are used between the coupling sleeve and the nipple to provide a leak tight connection, but this also results in that it is not ensured that a reliable electric connection is provided . Other connectors are known for connection hydraulic lines, but such connectors are not releasable. For example US 2017040717 and DE 102005013981 describe such a quick connector for quickly connecting hydraulic lines. The quick connectors do not comprise a releasable lock, so after inserting a nipple into the coupling sleeve, the connection is permanent. The above mentioned prior art does use an electric contact ring to ensure an electric contact between the nipple and the coupling sleeve and therewith to ensure electric contact between connected hydraulic lines.

None of the electric contact rings are suitable for a releasable connection. The ring of DE 102005013981 locks into a groove after insertion, preventing retraction of the nipple, whereas the electric contact ring of US 2017040717 has a complex structure and requires a number of ribs and grooves in the connection sleeve. When a known hydraulic quick

connector is to be adapted for an electric contact ring as known in US 2017040717, a substantial redesign is required of the hydraulic quick connector, which is typically undesired.

Therefore, it is an object of the invention to reduce or even remove the above mentioned disadvantages.

This object is achieved with a hydraulic quick connector according to the preamble, which hydraulic quick connector is characterized by an electric contact ring for ensuring electrical contact between the coupling sleeve and the nipple in the inserted position, which contact ring is mounted in a circumferential groove arranged in the coupling sleeve, wherein the contact ring is a coiled wire having at least one winding with a discontinuous curvature.

Using a coiled wire with a discontinuous curvature provides the possibility to create a circumscribed circle radius and an inscribed circle radius of which the difference is larger than the wire diameter. As a result, the coiled wire with discontinuous curvature can be clamped on the nipple and in the coupling sleeve. The discontinuous curvature further enables deformation of the coiled wire within the boundaries of the circumscribed circle and inscribed circle, which in turn provides the desired contact force on both the nipple and the coupling sleeve to provide a reliable electrical contact between both parts of the hydraulic quick connector.

In an embodiment of the hydraulic quick connector according to the invention the coiled wire has straight portions connected by bent portions.

By varying the number of straight portions and bent portions, an electrical contact ring is obtained, wherein the stiffness of the ring can be varied for a given wire, i.e. diameter and material.

In a preferred embodiment of the hydraulic quick connector according to the invention the straight portions are of equal length and the bent portions are of substantially equal shape, such that the electric contact ring has in axial view a polygonal shape.

Using conventional wire bending machines, the coiled wire with polygonal shape can easily be made. Furthermore, the number bends provide for reliable contact points with the coupling sleeve, while the number of straight portions ensure a reliable number of contact points with the nipple. So, with this embodiment the number of contact points of the electric contact ring is easily predefined.

In a further embodiment of the hydraulic quick connector according to the invention the diameter of the inscribed circle of the coiled wire is smaller than the outer diameter of the insertion end of the nipple. This ensures that when the nipple is inserted into the coupling sleeve, the electric contact ring will always be clamped on the nipple ensuring good electrical contact. In yet another embodiment of the hydraulic quick connector according to the invention the diameter of the circumscribed circle of the coiled wire is smaller than the diameter of the bottom of the circumferential groove and larger than the inner diameter of the coupling end of the coupling sleeve. Preferably, the thickness of the wire is equal or larger than the depth of the circumferential groove.

In this embodiment the coiled wire is accommodated in the circumferential groove and even when it is deformed by insertion of the nipple, it will still protrude partially out of the groove, as the depth of the groove is less than the thickness of the wire.

In still another embodiment of the hydraulic quick connector according to the invention the insertion end of the nipple has a rounded leading edge.

The rounded leading edge facilitates insertion of the connection end of the nipple into the electric contact ring and facilitates deformation of the ring, such that a good electrical contact is obtained between the nipple and the coupling sleeve.

These and other features of the invention will be elucidated in conjunction with the accompanying drawings.

Figure 1 shows a perspective view with cut away portions of a prior art hydraulic quick connector.

Figures 2A and 2B show a perspective view with cut away portions of an embodiment of the invention.

Figures 3A and 3B show respectively front and side view of the electric contact ring of the embodiment of figures 2A and 2B.

Figure 4 shows a front view of a second embodiment of an electrical contact ring for an hydraulic quick connector according to the invention.

Figure 1 shows a perspective view of a prior art hydraulic quick connector having a nipple 1 and a coupling sleeve 2. The nipple 1 has an insertion end 3 and a connection end 4 for connection with a fluid line. The connection can for example be embodied as a shrink fit or with a thread. The nipple 1 has furthermore a flange 5, with which the nipple 1 can be locked into the coupling sleeve 2.

The coupling sleeve 2 has also a connection end 6 for connection with a fluid line. Opposite of the connection end 6 is arranged the coupling end 7. Balls 8 protrude into this coupling end 7, such that after insertion of the

insertion end 3 the balls 8 will lock behind the flange 5. The operating sleeve 9, which is slidable over the coupling sleeve 2 prevents the balls 8 from moving out of engagement with the flange 5, until the operating sleeve 9 is slid against the force of the spring 10. Furthermore, a seal 11 is arranged in the coupling sleeve 2 to ensure a leakproof connection.

Figure 2A shows an embodiment 40 according to the invention. This embodiment 40 corresponds largely with the hydraulic quick connector 1, 2 shown in figure 1. The coupling sleeve 2 has a circumferential groove 41 arranged in the coupling end 7 of the coupling sleeve 2. An electric contact ring 42, which is a coiled wire, is mounted in the

circumferential groove 41.

When a nipple 1 is inserted with the insertion end 3 into the coupling end 7, the insertion end 3 will extend through the ring 42 (see figure 2B) such that the ring 42 is both in contact with the insertion end 3 and the

circumferential groove 41 and a reliable electrical contact is established between the coupling sleeve 2 and the nipple 1.

Figure 3A shows a front view of the ring 42. This ring 42 is a coiled wire having straight portions 43 and bend portions 44, such that a polygonal shape is obtained.

With the polygonal shape, the ring 42 has an inscribed circle with diameter D i and a circumscribed circle with diameter D 2 . Due to the polygonal shape the difference between the diameter D i and D 2 is more than twice the wire diameter D w . As a result, the ring 42 can expand/deform when the insertion end 3 with diameter D n of the nipple 1 is inserted into the ring 32. This ensures that the ring 42 is clamped onto the nipple 1 and also pushed in contact with the circumferential groove 41.

Figure 4 shows a front view of a second embodiment of an electrical contact ring 50. In this electrical contact ring 50, only three straight portions 51 are provided per winding, which straight portion 51 are connected with bend portions 52, which have a substantial longer length, than the bend portions 44 of the ring 42 of figures 3A and 3B. As a result, the ring 50 will be more stiff than the ring 42 when made from the same wire.

Due to the straight portions 51 the difference between the diameter D i and D 2 is still more than the wire thickness, such that ring 50 can deform when an insertion end of a hydraulic coupling according to the invention is inserted into the ring 50, while being housed in a groove of the coupling part and provide good electrical contact.