CN206478360U - A kind of connector applied to oil circuit transmission in motor vehicle - Google Patents

Abstract

The utility model provides a kind of connector applied to oil circuit transmission in motor vehicle, including pin end and female joint, and the pin end is fixedly connected by lock fastener with female joint；The pin end is hollow tubing conductor, and the pin end is formed by public connecting tube, first annular projection, the second annular protrusion, the 3rd annular protrusion and the first hose transition integrally connected successively；First annular raised with forming the clamping groove portion that can be engaged with lock fastener between the second annular protrusion.The lock fastener designed in symmetrical structure is employed in the utility model in connector, avoid existing self-locking device or lock fastener it is positive or reversely on adjustment spent by the set-up time, i.e. while reducing cost, improving attaching/detaching efficiency, the performance of the lock fastener in the utility model in turn ensure that；Ensure the sealing and stability of the connector that oil circuit is transmitted in the motor vehicle in the lock fastener to be applied to the connector transmitted applied to oil circuit in motor vehicle simultaneously.

Description

A kind of connector applied to oil circuit transmission in motor vehicle

Technical field

The utility model belongs to motor vehicle pipeline/technical field of pipeline connection, and in particular to one kind is applied in motor vehicle The connector of oil circuit transmission.

Background technology

Connector is a kind of device for being used for conveying the fluids such as gas, liquid, and usual connector is by pipe, pipe connection Part, valve etc. are formed by connecting；In the prior art, the arrangement of connector and installation for convenience, generally using the side of pipe joint Formula is completed, and the connected mode of existing joint has threaded connection, welding and card pressure etc., in actual operation is installed, there is one A little problems, such as joint are manufactured, and install the problems such as inconvenient, handling are difficult, installation rate is slow, lock fastener confining force is inadequate, In order to solve these problems, quick connector arises at the historic moment.

In current existing connector, lock fastener is all submerged this kind of quick connector of female joint, there is suitable one The confining force that part lock fastener is produced to pin end is insufficient to assure that being reliably connected for pipeline.Simultaneously after being dismounted for multiple times, locking Fastener easily loses original confining force, so can disconnect connection.

Utility model content

In order to which the confining force for overcoming existing quick connector technology to there is lock fastener generation is not enough carried there is provided one kind The lock fastener of symmetrical structure design, and with attaching/detaching is efficient, confining force is powerful enough, function admirable and with intelligence The connector for being applied to oil circuit transmission in motor vehicle of function can be changed.

The purpose of this utility model is to overcome in existing product deficiency there is provided following technical scheme：

The utility model provides a kind of connector applied to oil circuit transmission in motor vehicle, including pin end and female joint, The pin end is fixedly connected by lock fastener with female joint；The pin end be hollow tubing conductor, the pin end be successively by Public connecting tube, first annular projection, the second annular protrusion, the 3rd annular protrusion and the first hose transition integrally connected are formed 's；First annular raised with forming the clamping groove portion that can be engaged with lock fastener between the second annular protrusion；In public affairs even The sealing device of sealing state can be kept with female joint by being arranged with the outside wall surface of adapter.

The female joint is constituted in the middle part of clamping head, female joint with the second hose transition integrally connected；To When the public connecting tube of pin end extends into female joint inner via hole, the outside wall surface of public connecting tube passes through sealing device and female joint Internal face is tightly connected in the middle part of female joint；Lock fastener is downward through the open top surface end by clamping head and with being embedded in Clamping groove portion is in mating connection in pin end in female joint；The open top surface end on clamping head leads to provided with the horizontal fastener in side Groove, longitudinal opening fixed part, intermediate openings fixed part.

The lock fastener is centrosymmetric structure design, specifically：The lock fastener takes base plate, two offsides including hand Checkpost buckle, two longitudinally fixed card articles, stiffener plate, reinforcement and the semicircular arc that is linked into an integrated entity with the reinforcement are inserted Part head；The two opposite sides clamping part, two longitudinally fixed card articles, stiffener plate, reinforcements are separately fixed at hand and take base plate Same side on；Two opposite side clamping parts are separately positioned on hand and taken in base plate homonymy both ends of the surface, two longitudinally fixed card articles Hand is also set, respectively on to take in base plate homonymy both ends of the surface, and two longitudinally fixed card articles are located at one opposite side buckle of correspondence respectively In the middle of portion；Reinforcement and the semicircular arc connection-peg linked into an integrated entity with the reinforcement are respectively located at two opposite side clamping parts Between and two longitudinally fixed card articles between；The semicircular arc connection-peg includes half-arc groove oral area and positioned at the semicircle The bound edge button that arc notch bottom is connected；Being designed to of the structure effectively wraps the clamping groove portion on pin end, with Prevent clamping groove portion and whole pin end from waving or fluctuating on laterally (before and after i.e. or left and right) direction.

Two opposite side clamping parts are nested with the horizontal fastener groove in corresponding side connect respectively；Laterally block in side The left and right sides portion of fastener groove is offered can be with breach is engaged on every opposite side clamping part arc opening；Wherein：Often Opposite side clamping part is secondary and the second clamping pair is formed side by side by the first clamping, the first clamping pair be by the first connection rib with First arc elastic connection part integrally connected, the second clamping pair is integrally connected with the second arc elastic connection part by the second connection rib Connect；Junction forms the breach A of upward 45 ° of angles between first arc elastic connection part and the first connection rib；Second arc Junction forms the breach B of upward 45 ° of angles between shape elastic connection part and the second connection rib；Longitudinally fixed card article is arranged at first Clamping is secondary between the second clamping pair；When by lock fastener downward through open top surface end by clamping head, semi arch Shape connection-peg extends through the open top surface end on clamping head and withholds the pin end being embedded in female joint downwards simultaneously Middle clamping groove portion；Reinforcement is set into intermediate openings fixed part, while the semicircular arc connection-peg positioned at reinforcement lower end Mutually deducted with intermediate openings fixed part；Such structure design is also effectively guaranteed lock fastener in longitudinal direction (above and below i.e.) direction On steadiness.

Set per opposite side clamping part into the horizontal fastener groove in corresponding side, per the first of opposite side clamping part It is horizontal that the second arc elastic connection part difference buckle access on the first arc elastic connection part, the second clamping pair in clamping pair is located at side In arc opening in the portion of the fastener groove left and right sides；And two longitudinally fixed card articles are set into corresponding longitudinal opening In fixed part.

Preferably, the sealing device includes outer O-shaped rubber seal, inner shield ring, interior O-shaped rubber seal；It is described Outer O-shaped rubber seal, inner shield ring, interior O-shaped rubber seal are closely folded in the outer wall of public connecting tube from outside to inside successively Between face and the internal face of female joint；So as to ensure that the sealing of the connector.

Preferably, external diameter of the external diameter of the second annular protrusion more than the 3rd annular protrusion, and the 3rd annular protrusion External diameter is more than first annular raised external diameter.

Preferably, the internal face lower end side in the middle part of female joint is provided with RFID tag, pressure sensor and temperature Spend sensor.Due to being realized between internal face in the middle part of the outside wall surface of public connecting tube and the female joint of female joint by sealing device Connection；Consider：Sealing device is tight from outside to inside successively by outer O-shaped rubber seal, inner shield ring, interior O-shaped rubber seal Thickly it is folded between the outside wall surface of public connecting tube and the internal face of female joint；Sealing device is by long lasting for use Cause aging, liquid there may be the internal face penetrated into the middle part of female joint in pin end and the hollow pipe of female joint The junction between the outside wall surface of public connecting tube, therefore RFID tag is arranged on to the internal face lower end side in the middle part of female joint Main function is to carry out early warning so that RFID tag can transmit relative alarm information in time after occurring liquid leakage, Reach very first time early warning effect.It is fitted in naturally on the downside of pipeline when simultaneously in view of liquid deadweight or original liquid flowing Face.

Know preferably, offering one in the middle part of female joint in the utility model on lower surface and can set into radio frequency The notch of distinguishing label, pressure sensor or temperature sensor, and coordinate for the notch provided with a notch cap, notch envelope Capping include be easy to staff operate cap hand take portion and two embedded threaded posts, by RFID tag, pressure Force snesor or temperature sensor are set into after internal face in the middle part of female joint, then embedded by two of notch cap Threaded post is connected with outside wall surface screw thread in the middle part of female joint, while realizing the sealing to notch.

Compared with prior art, the beneficial effects of the utility model are：

The lock fastener designed in symmetrical structure is employed in the utility model in connector, it is to avoid existing self-locking device or Person's lock fastener it is positive or reversely on adjustment spent by the set-up time, that is, reducing cost, raising attaching/detaching efficiency While, it in turn ensure that the performance of the lock fastener in the utility model；It is applied to simultaneously by the lock fastener applied to machine Ensure the sealing and stability of the connector that oil circuit is transmitted in the motor vehicle in the connector that oil circuit is transmitted in motor-car.

RFID RFID tags and related sensor are employed in the utility model, its effect has：RFID radio frequency identifications Label can be used in detecting the presence of liquid leakage；Due to temperature sensor or pressure sensor and sealing ring (i.e. outer O-shaped rubber Sealing ring, inner shield ring or interior O-shaped rubber seal) indirect general one millimeter of most bottom surface less than, and by temperature sensor Lai Detect the temperature change from closest approach；Pressure sensor has central liquid accumulation phenomenon certainly due to occurring leakage simultaneously, inevitable Pressure is caused to become big.Other RFID RFID tags and temperature sensor or pressure sensor can monitor the working environment Temperature change and control air granule density and joint working time.When RFID RFID tags can be with writing task Between, marked product model whether (can be shown in process of production in LED display qualified by) RFID radio frequency identification markings Label can also realize product back-tracing, because RFID tag can record service condition, facilitate later stage research and service condition to chase after Track, material is provided for follow-up improvement.Realized using RFID RFID tags and temperature sensor or pressure sensor Intelligent product, can on automobile instrument panel the fluid temperature (F.T.) of display pipes, flow condition, ambient temperature, it is also possible to In bonnet, temperature acquisition is used everywhere or each section of temperature of conveyance conduit and flow velocity are gathered, and can finally allow car owner, maintenance personal, design Personnel, testing crew directly know joint fluid temperature by mobile phone-downloaded APP, have No leakage, flow rate of liquid, periphery to work Environmental monitoring etc..Prevent accident generation.

Brief description of the drawings

Fig. 1 is integrally-built explosive view in the utility model.

Fig. 2 is the structural representation of lock fastener in the utility model.

Fig. 3, Fig. 4 are the structural representation of female joint in the utility model.

Fig. 5 is the structural representation of notch cap (4) in the utility model.

Fig. 6, Fig. 7 and the structural representation that Fig. 8 is overall different section view angles in the utility model.

Embodiment

The technical solution of the utility model is described further with reference to Figure of description：

As shown in Fig. 1~8, the utility model provides a kind of connector applied to oil circuit transmission in motor vehicle, specifically： As shown in Fig. 1 and Fig. 6~8, the connector includes pin end 1 and female joint 2, and the pin end 1 passes through lock fastener 3 and mother Joint 2 is fixedly connected；The pin end 1 is hollow tubing conductor, and the pin end 1 is by public connecting tube 15, first annular projection successively 11st, the second annular protrusion 13, the 3rd annular protrusion 14 and the first hose transition integrally connected；In first annular projection The clamping groove portion 12 that can be engaged with lock fastener 3 is formed between 11 and the second annular protrusion 13；In the outer of public connecting tube 15 The sealing device of sealing state can be kept with female joint 2 by being arranged with wall.

Shown as shown in Figure 1, Figure 3 and Figure 4, the female joint 2 is connected by clamping head 21, female joint middle part 23 and the second flexible pipe Socket part integrally connected composition；When the public connecting tube 15 of pin end 1 is extended into 2 inner via hole of female joint, public connecting tube 15 Outside wall surface pass through sealing device and female joint 2 female joint in the middle part of 23 internal faces be tightly connected；Lock fastener 3 is downward through logical Cross the open top surface end on clamping head 21 and in mating connection with clamping groove portion 12 in the pin end 1 that has been embedded in female joint 2； The open top surface end on clamping head 21 is solid provided with the horizontal fastener groove 211 in side, longitudinal opening fixed part 212, intermediate openings Determine portion 213；

As depicted in figs. 1 and 2, the lock fastener 3 is centrosymmetric structure design, specifically：The lock fastener 3 includes Hand take base plate 31, two opposite side clamping parts 32, two longitudinally fixed card articles 33, stiffener plate 34, reinforcement 35 and with this The semicircular arc connection-peg 36 that reinforcement 35 links into an integrated entity；The two opposite sides clamping part 32, two longitudinally fixed card articles 33, Stiffener plate 34, reinforcement 35 are separately fixed at hand and taken on the same side of base plate 31；Two opposite side clamping parts 32 are set respectively Put and taken in hand in the homonymy both ends of the surface of base plate 31, two longitudinally fixed card articles 33 are also set, respectively on hand and take the homonymy two of base plate 31 On end face, and two longitudinally fixed card articles 33 are located in the middle of one opposite side clamping part 32 of correspondence respectively；Reinforcement 35 and with this The semicircular arc connection-peg 36 that reinforcement 35 links into an integrated entity respectively is located between two opposite side clamping parts 32 and two vertical To between fixing strip 33；The semicircular arc connection-peg 36 includes half-arc groove oral area 361 and positioned at the semi arch notch The bound edge button 362 that the bottom of portion 361 is connected；Being designed to of the structure effectively wraps the clamping groove portion 12 on pin end 1, To prevent buckling groove portion 12 and whole pin end 1 from waving or fluctuating before and after laterally i.e. or on left and right directions.

Connect as shown in Fig. 2 two opposite side clamping parts 32 are nested with the horizontal fastener groove 211 in corresponding side respectively Connect；In side, the left and right sides portion of horizontal fastener groove 211 offers and can matched with breach on every opposite side clamping part 32 The arc opening 22 of conjunction；Wherein：Formed side by side with the second clamping pair per opposite side clamping part 32 by the first clamping is secondary, first Clamping pair is formed by the first connection rib 322a with the first arc elastic connection part 321a integrally connecteds, and the second clamping pair is by the Two connection rib 322b and the second arc elastic connection part 321b integrally connected.First arc elastic connection part 321a is connected with first Junction forms the breach A323a of upward 45 ° of angles between rib 322a；Second arc elastic connection part 321b is connected rib with second Junction forms the breach B323b of upward 45 ° of angles between 322b；Longitudinally fixed card article 33 is arranged at the first clamping pair and second Between clamping pair.

As shown in Fig. 2 and Fig. 6~8, when by lock fastener 3 downward through open top surface end by clamping head 21, Semicircular arc plug head 36, which extends through the open top surface end on clamping head 21 simultaneously and withheld downwards, has been embedded in female joint 2 Clamping groove portion 12 in interior pin end 1；Reinforcement 35 is set into intermediate openings fixed part 213, while positioned at reinforcement 35 The semicircular arc connection-peg 36 of lower end mutually deducts with intermediate openings fixed part 213；Such structure design is also effectively guaranteed Lock fastener 3 is the steadiness on above-below direction in longitudinal direction.Set into corresponding side and laterally block per opposite side clamping part 32 In fastener groove 211, on the first arc elastic connection part 321a, the second clamping pair in the first clamping pair of every opposite side clamping part 32 The second arc elastic connection part 321b arcs that buckle access is located in the horizontal left and right sides portion of fastener groove 211 in side respectively open In mouth 22；And two longitudinally fixed card articles 33 are set into corresponding longitudinal opening fixed part 212.

As shown in figure 1, the sealing device includes outer O-shaped rubber seal 231, inner shield ring 232, interior O-shaped rubber seal Circle 233；The outer O-shaped rubber seal 231, inner shield ring 232, interior O-shaped rubber seal 233 are closely pressed from both sides from outside to inside successively It is located between the outside wall surface of public connecting tube 15 and the internal face of female joint 2；So as to ensure that the sealing of the connector.Second ring The external diameter of shape projection 13 be more than the 3rd annular protrusion 14 external diameter, and the 3rd annular protrusion 14 external diameter be more than it is first annular convex Rise 11 external diameter.

23 internal face lower end side is provided with RFID tag, pressure sensor and TEMP in the middle part of female joint Device.Due to being realized between 23 internal faces in the middle part of the outside wall surface of public connecting tube 15 and the female joint of female joint 2 by sealing device Connection；Consider：Sealing device be by outer O-shaped rubber seal 231, inner shield ring 232, interior O-shaped rubber seal 233 successively from It is outer to be closely folded between the outside wall surface of public connecting tube 15 and the internal face of female joint 2 in；Sealing device through it is long when Between lasting use and cause aging, liquid, which there may be, in pin end 1 and the hollow pipe of female joint 2 penetrates into mother and connects Junction between the outside wall surface of the internal face of centriciput 23 and public connecting tube 15, therefore RFID tag is arranged on female joint The internal face lower end side main function at middle part 23 be carry out early warning so that occur liquid leakage after RFID tag can and When transmit relative alarm information, reach very first time early warning effect.When simultaneously in view of liquid deadweight or original liquid flowing Naturally it is fitted in pipeline downside.

As shown in Figure 1 and Figure 5, offered in the middle part of female joint in the utility model on 23 lower surfaces one can set into Enter the notch of RFID tag, pressure sensor or temperature sensor, and coordinate for the notch provided with a notch cap 4, the cap hand that the notch cap 4 includes being easy to staff to operate takes portion 41 and two embedded threaded posts 42, is inciting somebody to action RFID tag, pressure sensor or temperature sensor are set into after 23 internal faces in the middle part of female joint, then pass through notch Two embedded threaded posts 42 of cap 4 are connected with 23 outside wall surface screw threads in the middle part of female joint, while realizing to notch Sealing.

The lock fastener designed in symmetrical structure is employed in the utility model in connector, it is to avoid existing self-locking device or Person's lock fastener it is positive or reversely on adjustment spent by the set-up time, that is, reducing cost, raising attaching/detaching efficiency While, it in turn ensure that the performance of the lock fastener in the utility model；It is applied to simultaneously by the lock fastener applied to machine Ensure the sealing and stability of the connector that oil circuit is transmitted in the motor vehicle in the connector that oil circuit is transmitted in motor-car.

RFID RFID tags and related sensor are employed in the utility model, its effect has：RFID radio frequency identifications Label can be used in detecting the presence of liquid leakage；Due to temperature sensor or pressure sensor and sealing ring (i.e. outer O-shaped rubber Sealing ring 231, inner shield ring 232 or interior O-shaped rubber seal 233) indirect general one millimeter of most bottom surface less than and by temperature Sensor detects the temperature change from closest approach；Pressure sensor has central liquid accumulation existing certainly due to occurring leakage simultaneously As necessarily causing pressure to become big.Other RFID RFID tags and temperature sensor or pressure sensor can be monitored The temperature change of working environment and the granule density of control air and joint working time.RFID RFID tags can also be remembered Record working time, marked product model whether (can be shown in process of production in LED display qualified by) RFID are penetrated Frequency identification tag can also realize product back-tracing, because RFID tag can record service condition, facilitate the later stage to study and make Followed the trail of with situation, material is provided for follow-up improvement.Use RFID RFID tags and temperature sensor or pressure sensing Device realizes intelligent product, can on automobile instrument panel the fluid temperature (F.T.) of display pipes, flow condition, surrounding environment temperature Degree, it can also be used to which use everywhere or each section of temperature of conveyance conduit and flow velocity are gathered by temperature acquisition for bonnet, can finally allow car owner, maintenance Personnel, designer, testing crew directly know joint fluid temperature by mobile phone-downloaded APP, have No leakage, liquid flow Speed, the monitoring of periphery working environment etc..Prevent accident generation.

It, to explanation of the present utility model, is limited of the present utility model that above-described embodiment, which is, any new to this practicality Scheme after type simple transformation belongs to protection domain of the present utility model.

Claims (4)

1. a kind of connector applied to oil circuit transmission in motor vehicle, including pin end (1) and female joint (2), the pin end (1) it is fixedly connected by lock fastener (3) with female joint (2)；It is characterized in that：

The pin end (1) is hollow tubing conductor, the pin end (1) be successively by public connecting tube (15), first annular raised (11), Second annular protrusion (13), the 3rd annular protrusion (14) and the first hose transition integrally connected；First annular convex Play the clamping groove portion (12) that is formed and can be engaged with lock fastener (3) between (11) and the second annular protrusion (13)；In public affairs even The sealing device of sealing state can be kept with female joint (2) by being arranged with the outside wall surface for taking over (15)；

The female joint (2) (23) and second hose transition integrally connected in the middle part of clamping head (21), female joint are constituted 's；When the public connecting tube (15) of pin end (1) is extended into female joint (2) inner via hole, the outside wall surface of public connecting tube (15) It is tightly connected by sealing device with (23) internal face in the middle part of the female joint of female joint (2)；

Lock fastener (3) is downward through the open top surface end by clamping head (21) and with being embedded in female joint (2) Clamping groove portion (12) is in mating connection in pin end (1)；The open top surface end on clamping head (21) is provided with the horizontal fastener in side Groove (211), longitudinal opening fixed part (212), intermediate openings fixed part (213)；

The lock fastener (3) takes base plate (31), two opposite side clamping parts (32), two longitudinally fixed card articles including hand (33), stiffener plate (34), reinforcement (35) and the semicircular arc connection-peg (36) linked into an integrated entity with the reinforcement (35)； The two opposite sides clamping part (32), two longitudinally fixed card articles (33), stiffener plate (34), reinforcements (35) are separately fixed at Hand is taken on the same side of base plate (31)；

Two opposite side clamping parts (32) are separately positioned on hand and taken in base plate (31) homonymy both ends of the surface, two longitudinally fixed card articles (33) hand is also set, respectively on to take in base plate (31) homonymy both ends of the surface, and two longitudinally fixed card articles (33) are located at correspondence respectively In the middle of one opposite side clamping part (32)；Reinforcement (35) and the semicircular arc connection-peg linked into an integrated entity with the reinforcement (35) (36) respectively it is located between two opposite side clamping parts (32) and between two longitudinally fixed card articles (33)；

The semicircular arc connection-peg (36) includes half-arc groove oral area (361) and positioned at half-arc groove oral area (361) bottom Hold the bound edge button (362) being connected；Two opposite side clamping parts (32) are embedding with the horizontal fastener groove (211) in corresponding side respectively Set is connected；Being offered in the left and right sides portion of side transverse direction fastener groove (211) can be with every opposite side clamping part (32) arc opening (22) that breach is engaged on；

Wherein：Formed side by side with the second clamping pair per opposite side clamping part (32) by the first clamping is secondary, the first clamping pair is By the first connection rib (322a) and first arc elastic connection part (321a) integrally connected, the second clamping pair is connected by second Connect rib (322b) and second arc elastic connection part (321b) integrally connected；

First arc elastic connection part (321a) is connected the breach A that junction between rib (322a) forms upward 45 ° of angles with first (323a)；Junction forms lacking for upward 45 ° of angles between second arc elastic connection part (321b) is connected rib (322b) with second Mouth B (323b)；It is secondary between the second clamping pair that longitudinally fixed card article (33) is arranged at the first clamping；

When by lock fastener (3) downward through open top surface end by clamping head (21), semicircular arc connection-peg (36) Extend through the open top surface end on clamping head (21) simultaneously and withhold the pin end being embedded in female joint (2) downwards (1) clamping groove portion (12) in；

Reinforcement (35) is set into intermediate openings fixed part (213), while the semicircular arc positioned at reinforcement (35) lower end Connection-peg (36) offsets with intermediate openings fixed part (213)；

Set per opposite side clamping part (32) into the horizontal fastener groove (211) in corresponding side, per opposite side clamping part (32) the second arc elastic connection part (321b) on the first arc elastic connection part (321a), the second clamping pair point in the first clamping pair Other buckle access is located in the arc opening (22) in horizontal fastener groove (211) left and right sides portion in side；And two vertical Set to fixing strip (33) into corresponding longitudinal opening fixed part (212).

2. a kind of connector applied to oil circuit transmission in motor vehicle according to claim 1, it is characterised in that described Sealing device includes outer O-shaped rubber seal (231), inner shield ring (232), interior O-shaped rubber seal (233)；The outer O-shaped rubber Glue sealing ring (231), inner shield ring (232), interior O-shaped rubber seal (233) are closely folded in public connection from outside to inside successively Manage between the outside wall surface of (15) and the internal face of female joint (2)；So as to ensure that the sealing of the connector.

3. a kind of connector applied to oil circuit transmission in motor vehicle according to claim 1, it is characterised in that second The external diameter of annular protrusion (13) is more than the external diameter of the 3rd annular protrusion (14), and the external diameter of the 3rd annular protrusion (14) is more than the The external diameter of one annular protrusion (11).

4. a kind of connector applied to oil circuit transmission in motor vehicle according to claim 1 or 2, it is characterised in that The internal face lower end side of (23) is provided with RFID tag, pressure sensor or temperature sensor in the middle part of female joint.