CN113047989A

CN113047989A - Connection structure of air intake system and air intake system

Info

Publication number: CN113047989A
Application number: CN201911388030.3A
Authority: CN
Inventors: 刘亚洲; 曹晨吉
Original assignee: Mann and Hummel GmbH
Current assignee: Mann and Hummel GmbH
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-06-29

Abstract

The invention discloses a connecting structure of an air inlet system, which is used for connecting a first tubular component and a second tubular component of the air inlet system, and comprises a locking protrusion positioned on the first tubular component and a latch arm positioned on the second tubular component and used for being matched with the locking protrusion, wherein when the first tubular component is connected with and separated from the second tubular component, the locking protrusion can force the latch arm to generate relative movement for realizing locking and releasing between the latch arm and the locking protrusion by means of the movement of the first tubular component and/or the second tubular component along the self axial direction. The air filter air inlet pipe connecting and separating device can achieve connection and separation between a first tubular component (such as a tubular joint arranged on an air filter) and a second tubular component (such as an air filter air inlet pipe or a tubular joint arranged on the air filter air inlet pipe) of an air inlet system by hands without using tools. The invention also discloses an air inlet system with the connecting structure.

Description

Connection structure of air intake system and air intake system

Technical Field

The present invention relates to a connection structure of an intake system, which connects a first tubular member and a second tubular member of the intake system. The invention also discloses an air inlet system, which comprises an air filter and an air filter air inlet pipe, wherein the air filter and the air filter air inlet pipe can be connected through the connecting structure.

Background

The air filter air inlet pipe (also called as an air inlet system dirty air pipe) is connected to an air filter (also called as an air filter) in a mode of preferably using a buckle, a locking protrusion is designed at the outlet of the dirty air pipe, and a hollow-out part or a notch is designed at the inlet of the corresponding air filter. The in-process of dirty air hose installation air cleaner, during locking arch slipped the lock gradually to hollow out construction, because the boss has the back-off structure, can't deviate from easily, played the effect of connecting fixed dirty air hose and air cleaner. And relatively, the process of tearing out needs use tools to pull the buckle open certain angle through external force and just can take out dirty air pipe, and unable free-hand operation, and the tool damages the buckle easily when propping against the buckle and dismantling dirty air pipe.

Considering that the arrangement of the engine room of the automobile is becoming compact in recent years, a sufficient tool operation space cannot be secured. The headlamp, the washing liquid pot and the brake liquid pot need to remove a dirty air pipe of the air inlet system during maintenance, and have certain opportunity to be closer to the arrangement distance of the air inlet system, so that the operation space is more narrow.

The prior art snap connection structures, which require tools for removal and are easily damaged during removal, are therefore increasingly unsuitable for modern compact automotive engine compartment arrangements and repeated disassembly and assembly requirements.

Disclosure of Invention

In order to solve the above problems, the present invention provides a connection structure of an air intake system and an air intake system, which can achieve connection and separation between a first tubular member (e.g., a tubular joint portion provided on an air cleaner) and a second tubular member (e.g., an air filter intake pipe or a tubular joint portion on an air filter intake pipe) of the air intake system by hand without using tools.

The invention discloses a connecting structure of an air inlet system, which is used for connecting a first tubular component and a second tubular component of the air inlet system, and comprises a locking protrusion positioned on the first tubular component and a latch arm positioned on the second tubular component and matched with the locking protrusion in a relative motion mode.

Further, the locking projection comprises a first side and a second side arranged in the axial direction of the first tubular part, the second side being opposite to the first side and located on the side of the locking projection facing away from the second tubular part, the latch arm being clamped against the second side to form a lock when the first tubular part is connected to the second tubular part, the second side being a bevel extending obliquely in the axial direction from its tip edge in a direction facing away from the second tubular part, so that upon separation of the first tubular part from the second tubular part, the latch arm (10) is forced to perform a relative movement.

Further, the attachment structure locks in a manner that the latch arm remains in contact with the second side of the locking projection, and is spaced from the top and/or first side of the locking projection.

Further, the first side surface extends obliquely in the direction toward the second tubular member in the axial direction from the tip edge with respect to the second side surface, forming a guide slope capable of guiding the latch arm to slide along the locking projection and to cause relative movement when the first tubular member and the second tubular member are coupled.

Further, the first side surface and the second side surface are each angled with respect to a central axis of the first tubular member, and the second side surface is angled with respect to the central axis of the first tubular member at a greater angle than the first side surface.

Further, the second side surface is inclined at an angle of 45 ° to 80 ° with respect to the central axis of the first tubular member.

Further, the second side face is inclined at an angle of 60 ° with respect to the central axis of the first tubular member.

Further, the first side face is inclined at an angle of 10 ° to 45 ° with respect to the central axis of the first tubular member.

Further, the first side face is inclined at an angle of 20 ° with respect to the central axis of the first tubular member.

Further, the latch arm performs relative movement in a direction perpendicular to the axial direction of the second tubular member in a manner to have elastic deformation.

Further, the latch arm includes a connecting portion connected to the second tubular member and an abutting portion connected to the connecting portion, the abutting portion has an inclined structure in accordance with the inclination direction of the second side surface, and in the locked position, a side surface of the abutting portion (40) facing the locking protrusion (20) forms an abutting surface (102) for abutting engagement with the second side surface (201) of the locking protrusion (20).

Further, the connecting portion includes a base portion disposed in parallel with the central axis of the second tubular member and connected with the body of the second tubular member.

Further, the connecting portion further comprises an avoiding portion which is located between the base portion and the clamping portion and used for keeping a gap with the top and/or the first side surface of the locking protrusion after locking.

Further, the avoiding portion is an inclined structure extending from the base portion toward the catching portion, and the inclined direction of the avoiding portion is identical to or close to the inclined direction of the first side surface of the locking protrusion.

Further, the avoidance part comprises a first avoidance area and a second avoidance area which are sequentially arranged from the base part to the direction of the clamping part, a first avoidance gap is formed between the first avoidance area and the first side face at the locking position, and a second avoidance gap is formed between the second avoidance area and the top of the locking protrusion.

Further, the first avoidance gap and/or the second avoidance gap are/is 1-5 mm.

Further, the first avoidance gap is 2mm, and the second avoidance gap is 2.2 mm.

Further, the latch arm still includes the direction cooperation portion of being connected with the card portion, and the card portion is located between direction cooperation portion and the connecting portion, and the direction cooperation portion is used for forming the first guide part of direction with the bellied first side sliding fit of locking including when connecting at least, and first guide part is the slope structure that suits with the slope of the bellied first side of locking to the side of first guide part orientation locking arch one side forms the first direction inclined plane with first side matched with.

Further, the guide engagement portion further includes a second guide portion located between the abutment portion and the first guide portion, and during the locking and releasing processes, the second guide portion can be slidably engaged with the top of the locking projection in a surface contact manner to achieve transition of the latch arm between the first side and the second side of the locking projection, that is, transition of the latch arm from the first side to the second side of the locking projection or transition of the latch arm from the second side to the first side of the locking projection.

Furthermore, a transition top surface connected with the first side surface and the second side surface is formed at the top of the locking protrusion, the transition top surface is a plane, and the side surface of the second guide part facing one side of the locking protrusion is a matched plane.

Further, the transition top surface is a straight plane parallel to the central axis of the first tubular member.

Further, the second tubular component is also provided with an abutting shoulder for abutting and forming positioning of the end part of the first tubular component.

Further, the latch arm is integrally formed with the second tubular member.

Further, the first tubular member has a wall thickness of 2-4 mm.

Further, the wall thickness of the first tubular member was 2.2 mm.

Further, the second tubular member has a wall thickness of 1.5 to 3 mm.

Further, the wall thickness of the second tubular member was 2 mm.

Further, the first tubular component is a first tubular joint part which is arranged on the air filter and used for being connected with the air filter air inlet pipe, and the second tubular component is a second tubular joint part which is formed on the air outlet side of the air filter air inlet pipe and used for being connected with the air filter;

or the first tubular part is a first tubular joint formed on the air outlet side of the air filter air inlet pipe and used for being connected with an air filter, and the second tubular part is a second tubular joint arranged on the air filter and used for being connected with the air filter air inlet pipe.

The invention also discloses an air inlet system, which comprises an air filter and an air filter air inlet pipe, wherein the air filter and the air filter air inlet pipe are connected through the connecting structure of the air inlet system.

Further, be provided with on the empty filter and be used for with empty first tubular part of straining the intake pipe connection, the side of giving vent to anger of empty intake pipe forms and is used for the second tubular part with this first tubular part plug-in type cooperation.

Further, the locking protrusion is arranged on the first tubular component, the latch arm is arranged on the second tubular component, and the latch arm is matched with the locking protrusion to realize locking when the first tubular component and the second tubular component are in plug-in type matching.

Has the advantages that: the invention discloses a connecting structure of an air inlet system and the air inlet system thereof, wherein a latch arm and a locking bulge of the connecting structure are respectively and correspondingly arranged on a first tubular part and a second tubular part of the air inlet system, when the first tubular part and the second tubular part are connected, the locking bulge can force the latch arm to generate relative movement for realizing locking with the locking bulge by virtue of the connection movement of the first tubular part and/or the second tubular part along the self axial direction in the connecting process, and further realize the locking of the latch arm and the locking bulge; when the first tubular part is separated from the second tubular part, the second side surface can force the latch arm to generate relative movement for realizing the release with the locking bulge by means of the separation movement of the first tubular part and/or the second tubular part along the axial direction of the first tubular part and/or the second tubular part, and further realize the release between the latch arm and the locking bulge; through this connection structure to make and need not to borrow the tubular joint portion that the instrument just can bare-handed realize the connection and the separation between the first tubular component of air intake system (for example setting up on the air cleaner) and the second tubular component (for example empty tubular joint portion on straining the intake pipe or empty and strain the intake pipe).

Drawings

The connection structure of the intake system of the present invention will be described in more detail below with reference to the accompanying drawings:

FIG. 1 shows an isometric view of an air induction system in accordance with the present invention;

FIG. 2 shows a front view of the air induction system of the present invention;

FIG. 3 shows a partial cross-sectional view of the connection structure of the present invention taken along the A-A direction shown in FIG. 2;

FIG. 4 is a sectional structural view showing a locking projection in the coupling structure of the present invention;

fig. 5 is a cross-sectional structural view of the latch arm of the connection of the present invention;

FIG. 6 is a sectional view showing the connection structure of the present invention after the connection is completed;

fig. 7 to 9 show a connection process of the connection structure in the present invention, in which fig. 7 is a sectional view of the connection structure before connection, fig. 8 is a sectional view in connection, and fig. 9 is a sectional view of completion of connection.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the embodiment examples shown in the drawings. In the description of the embodiments of the present invention, it should be noted that the terms "front", "back", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally arranged when products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be constructed in specific orientations, and operated, and thus, cannot be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Fig. 1 is an axial view of an intake system in the present invention, and fig. 2 is a front view of the intake system in the present invention. As shown in fig. 1 and 2, the present invention discloses an air intake system comprising an air intake filter tube 1 and an air filter 2, wherein a first tubular joint portion forming a first tubular member 3 for connecting and communicating with the air intake filter tube 1 is provided on the air filter 2, a second tubular joint portion for connecting and communicating with the air filter 2 is formed on an air outlet side of the air intake filter tube 1 (i.e., a communication end with the air filter 2), the second tubular joint portion is a second tubular member 4, and the first tubular member 3 and the second tubular member 4 are in a plug-in type fit, as shown in fig. 1 and 2, when connected, an air inlet end of the first tubular member 3 as a male side is inserted into the second tubular member 4 as a female side to form a plug-in type fit, that is, the air intake filter tube 1 as a female side is directly fitted over an upper portion of the first tubular member 3. In other embodiments, the second tubular member 4 may be inserted into the first tubular member 3 to form a connection, i.e., as long as the plug-in fit of the first tubular member 3 with the second tubular member 4 is satisfied.

And in which the first tubular member 3 and the second tubular member 4 of the air intake system are connected by a connecting structure as shown in fig. 3 to 9, and tool-less connection and disconnection between the first tubular member 3 and the second tubular member 4 are achieved by the connecting structure. In further embodiments, the first tubular member 3 and the second tubular member 4 may also be other tubular members of the air intake system, such as a tubular member on the air intake side of the air filter intake duct and a tubular member on the air outlet side of the air filter, in which case tool-less connection and disconnection as described herein can also be achieved using the disclosed connection structure.

Specifically, a specific embodiment of the connection structure of the intake system in the present invention will be described below with reference to fig. 3 to 9.

The present invention discloses a connection structure of an intake system for connecting a first tubular member 3 and a second tubular member 4 of the intake system as described above. Fig. 3 is a partial sectional view of the connection structure of the present invention taken along the direction a-a in fig. 2. As shown in fig. 3, two radially symmetrical latch arms 10 are disposed on the second tubular member 4 of the air inlet filter 1 as the female side, the second tubular member 4 is provided with corresponding notches at the positions where the latch arms 10 are disposed to accommodate the latch arms 10 and ensure relative movement, the two latch arms 10 can be of a cantilever type structure and can be integrally formed with the second tubular member 4, while two corresponding locking protrusions 20 are integrally disposed on the first tubular member 3 as the male side, and the locking protrusions 20 are disposed on the outer side wall of the first tubular member 3. Of course, in other embodiments, the positions of the locking projection 20 and the latch arm 10 may be interchanged, such as the locking projection 20 being provided on the second tubular member 4 as the female side and the latch arm 10 being provided on the first tubular member 3 as the male side. Wherein upon connection or disconnection, the first tubular part 3 and/or the second tubular part 4 can be moved manually in their own axial direction, by means of which axial movement the locking projection 20 can force the latch arm 10 into a relative movement for locking and releasing with the locking projection 20.

Specifically, the air filter air inlet pipe 1 and the air filter 2 are connected through the plug-in type matching of the first tubular component 3 and the second tubular component 4, when the first tubular component 3 and the second tubular component 4 are connected, the locking protrusion 20 can force the latch arm 10 to generate relative movement for realizing locking with the locking protrusion 20 by virtue of the connection movement of the first tubular component 3 and/or the second tubular component 4 along the self axial direction during the connection process, and further realize the locking of the latch arm 10 and the locking protrusion 20; when the first tubular member 3 is separated from the second tubular member 4, the second side can force the latch arm 10 to produce a relative movement for effecting release from the locking projection 20 by means of a separating movement of the first tubular member 3 and/or the second tubular member 4 in its own axial direction, and thereby effect release between the latch arm 10 and the locking projection 20; through this connection structure to make and need not to use the instrument just can realize the connection and the separation between the first tubular component 3 of air intake system (for example the tubulose joint portion that sets up on the air cleaner) and the second tubular component 4 (for example the tubulose joint portion on the air filter intake pipe or the air filter intake pipe) by bare-handed. The relative movement of the latch arm 10 means that the latch arm can move in a direction perpendicular to the axial direction of the second tubular member relative to the locking projection 20 when pressed by the locking projection 20, specifically, move in a direction away from the locking projection 20 in a direction perpendicular to the axial direction of the second tubular member when pressed by the locking projection 20 immediately after the connection or separation, and perform a returning movement in a direction toward the locking projection when the latch arm passes over the top of the locking projection 20 during the connection and separation. In this embodiment, the latch arm 10 achieves this relative movement by having a resilient deformation, and in other embodiments, the latch arm may also be connected to the second tubular member 4 by a spring to achieve this relative movement.

Fig. 4 is a sectional structural view showing a locking projection in the coupling structure of the present invention. As can be seen in connection with fig. 3 and 4, the locking projection 20 comprises a first side surface 203 arranged in the axial direction of the first tubular part 3 and a second side surface 201 which is located opposite the second tubular part 4 of the locking projection 20 in the axial direction of the first tubular part 3 with respect to the first side surface 203, the latch arm 10 being locked in abutment against the second side surface 201 when the first tubular part 3 is connected to the second tubular part 4, the second side surface 201 being a sloping surface which extends obliquely away from the second tubular part 4 and which is at an angle to the centre axis L of the first tubular part 3, so that upon separation of the first tubular part 3 from the second tubular part 4, the second side surface 201 can force the latch arm 10 into a relative movement for effecting a release from the locking projection 20 by means of a separating movement of the first tubular part 3 and/or the second tubular part 4 in its axial direction.

And as shown in fig. 3 and 4, the first side 203 extends obliquely with respect to the second side 201 toward the second tubular member 4, forming a guide slope capable of guiding the latch arm 10 to slide along the locking projection 20 and to make a relative movement when the first tubular member 3 and the second tubular member 4 are coupled. That is, upon connection, latch arm 10 first contacts first side 203 forming a guide ramp and transitions to second side 201 guided by first side 203. And since the first side 203 extends obliquely in the direction of the axis L toward the second tubular member 4, the latch arm 10 can be moved relatively to the locking projection 20 and can be smoothly produced at the time of connection.

In addition, as shown in fig. 3 and 4, the top of the locking projection 20 is formed with a transition top surface 202 connected to both the first side surface 203 and the second side surface 201, the transition top surface 202 being a flat surface, and the transition top surface 202 being a straight flat surface parallel to the axis L of the first tubular member 3. When the latch arm 10 transits from the first side surface 203 to the second side surface 201 of the locking protrusion 20 or transits from the second side surface 201 to the first side surface 203 of the locking protrusion 20, the transition is realized by the straight planar transition top surface 202, so that abrupt change of the latch arm 20 in the transition between the first side surface 203 and the second side surface 201 is prevented, and smooth transition is ensured. And by the straight planar transitional top surface 202, latch arm 10 is able to remain in surface contact with the top of locking projection 20, thereby preventing stress concentrations and ensuring the useful life of latch arm 10.

Fig. 5 is a sectional view showing the latch arm in the connecting structure of the present invention. As can be seen from fig. 3 and 5, the latch arm 10 includes a connecting portion connected to the second tubular member 4 and a latching portion 40 connected to the connecting portion, the latching portion 40 has an inclined structure in accordance with the inclination direction of the second side surface 201, and the side surface of the latching portion 40 facing the locking projection 20 forms a latching surface 102 for latching and cooperating with the second side surface 201 of the locking projection 20. That is, during the connection, after the latch arm 10 has slid past the first side 203 and the transition top 202 of the locking projection 20 in this order, the latch arm 10 is caused to move relatively closer to the locking projection 20 in a direction perpendicular to the axis L of the first tubular member 3 (i.e., a return movement) until the abutment portion 40 is caught against the second side 201, at which time the catching surface 102 is locked against the second side 201. In the present embodiment, the catching portion coincides with the inclination direction and the inclination angle of the second side surface 201 in both the inclination direction and the inclination angle.

Also, as shown in fig. 5, the connecting portion includes a base portion 60 and a relief portion 50 located between the base portion 60 and the catching portion 40 and connected to each other, and the elastic deformation of the latch arm 10 is achieved by the elastic deformation at the base portion 60 or the elastic deformation of the relief portion 50; the base portion 60 is disposed in parallel with the central axis D of the second tubular member 4 and is connected to the body of the second tubular member 4.

In addition, it is to be noted that, in the connection structure of the intake system, when the lock position is performed, the escape portion 50 maintains a gap with the top and/or the first side surface 203 of the lock protrusion 20 after the lock. As shown in fig. 3 and fig. 6 and 9 below, a gap is maintained between the latch arm 10 and both the top and first side 203 of the locking projection 20 in the latched position, i.e., such that the latch arm 10 of the connecting structure is able to maintain a non-contact state between the top and first side 203 of the locking projection 20 while maintaining latching contact with the second side 201 of the locking projection 20 in the latched position. In this way, on the basis of ensuring the locking stability, the contact area between the locking arm 10 and the locking protrusion 20 after the locking connection is greatly reduced, so that the resistance of the locking protrusion 20 forcing the locking arm 10 to move relatively when the first tubular member 3 is separated from the second tubular member 4 is reduced, and the aim of detachably realizing the connecting structure of the invention without tools is further ensured. That is, the arrangement of the escape portion 50 in cooperation with the inclined second side surface 201 of the locking projection 20 ensures that the coupling structure of the present invention can be easily detached without using tools.

Specifically, the avoiding portion 50 has an inclined structure extending from the base portion 60 toward the abutment portion and substantially coinciding with the inclined direction of the first side surface 203 of the locking protrusion 20, and the avoiding portion 50 includes a first avoiding region 104 and a second avoiding region 103 which are sequentially arranged from the base portion 60 toward the abutment portion 40, and as shown in fig. 6 below, a first avoiding gap b is formed between the first avoiding region 104 and the first side surface 203, and a second avoiding gap a is formed between the second avoiding region 103 and the top of the locking protrusion 20. In this embodiment, the first avoidance gap b and/or the second avoidance gap a is 1-5mm, preferably, the first avoidance gap b is 2mm, and the second avoidance gap a is 2.2 mm.

By the provision of the relief portion 50, the attachment structure can be locked in such a manner that the latch arm 10 is held in contact with the second side 201 of the locking projection 20, with a gap maintained between the top and first sides 203 of the locking projection 20, as shown in fig. 3 and fig. 9 and 6 below. This allows the latch arm 10 and the lock projection 20 to be held in contact only between the second side surface 201 for engagement and the engagement surface 102 after the latch arm 10 and the lock projection 20 are locked together in the axial direction of the tubular member, and a gap (i.e., non-contact) is maintained at both the top and the first side surface 203 of the lock projection 20, so that on the basis of ensuring the stable locking, only the frictional force between the second side surface 201 and the engagement surface 102 needs to be overcome when the separation is required, further ensuring that the separation between the latch arm 10 and the lock projection 20 can be achieved without tools.

In addition, as can be seen from fig. 3 and 5, the latch arm 10 further includes a guiding engagement portion connected to an end of the latching portion 40 away from the connecting portion, the guiding engagement portion includes a first guiding portion 30 slidably engaged with and forming a guide with the first side surface of the locking protrusion 20 and a second guiding portion 80 located between the latching portion 40 and the first guiding portion 30 and connected to each other, the first guiding portion 30 is an inclined structure adapted to an inclination of the first side surface 203 of the locking protrusion 20, and a first guiding inclined surface 100 adapted to the first side surface 203 is formed on a side surface of the first guiding portion 30 facing the locking protrusion 20, that is, an inclination angle and a direction of the first guiding inclined surface 100 are both consistent with an inclination angle and a direction of the first side surface 203, a side surface of the second guiding portion 80 facing the locking protrusion 20 is an engagement plane 102 adapted to a straight plane transition top surface 202 of the locking protrusion 20, so that the transition of latch arm 10 from first side 203 to second side 201 of latch projection 20 or from second side 201 to first side 203 of latch projection 20 is effected by second guide 80 in surface contact with the top of latch projection 20.

In addition, as can be seen from fig. 3 and 5, the second tubular member 4 is further provided with an abutting shoulder 70 for abutting and positioning the end of the first tubular member 3. When the second tubular member 4 is connected to the first tubular member 3, the first tubular member 3 is inserted into the second tubular member 4, and the front end of the first tubular member 3 abuts against the abutment shoulder 70 to form an abutment position, and the abutment portion 40 of the latch arm 10 is locked by the abutment shoulder 70 and the latch arm 10 cooperating to form a locking position for the first tubular member 3, preventing its axial play. As shown in fig. 5, a stop shoulder 70 is provided at the junction of the base portion 60 of the latch arm 10 and the body of the air inlet filter tube 1.

Further, as shown in fig. 4 and 5, the first tubular member 3 has a wall thickness d1 of 2-4mm, preferably 2mm, 2.2mm, 3mm or 4mm, and the second tubular member 4 has a wall thickness d2 of 1.5-3mm, preferably 1.5mm, 2mm or 3 mm. The first tubular member is not deformed and its wall thickness has little effect compared to the second tubular member. When the second tubular member is mounted and dismounted, the second tubular member is deformed by the elastic material, and the wall thickness of the second tubular member will affect the mounting of the structure whether it is broken or not, but 2mm is the best mode.

Fig. 6 shows a cross-sectional view of the connection structure of the present invention after the connection is completed. As shown in fig. 6, when the connection is completed, the catching portion 40 of the latch arm 10 catches against the second side 201 of the locking projection 20 to form a lock. As can be seen in fig. 6, the first guiding bevel 100 of the latch arm 10 is arranged at an inclination β of 10 ° -45 ° with respect to the central axis D of the second tubular part 4 itself. As previously described, the first guide slope 100 of the latch arm 10 is inclined at an angle and in a direction corresponding to the angle and in a direction of inclination of the first side 203, and therefore the first side 203 is also inclined at an angle of 10 ° to 45 °, preferably 10 °, 20 °, or 45 °, with respect to the axis L of the first tubular member 3. And as shown in fig. 6, the clamping surface 102 is arranged at an inclination angle alpha relative to the central axis D of the second tubular member 4 and the second side surface 201 is arranged at an inclination angle alpha relative to the axis L of the first tubular member 3, wherein the inclination angle alpha is 45-80 degrees instead of a right angle, so that the latch arm 10 of the air filter inlet pipe 1 can be deformed and turned outwards during the disassembly process, and the air filter inlet pipe 1 can be detached from the air filter 2 without damage, thereby completing the disassembly process. The inclination angle α is preferably 45 °, 60 ° or 80 °.

The value of the inclination angle alpha of the second side surface 201 is directly related to the difficulty of dismounting the air filter inlet pipe 1 from the air filter 2, if the angle is designed to be too large, such as approaching 90 degrees, the connection is stable after installation, but the dismounting is difficult; if the angle is designed to be too small, for example, less than 45 degrees, the air filter is easy to disassemble, but the connection is not stable, and the air filter inlet pipe 1 is easy to be separated from the air filter 2 due to vibration when the vehicle normally runs. The 60 degree design of the present embodiment balances the stability of the connection and the easiness of disassembly. In addition, because the air filter inlet pipe 1 and the air filter 2 are both injection-molded parts, the design values of the second avoidance gap a and the first avoidance gap b should be greater than 1mm in consideration of the tolerance of injection-molded parts, so that the locking protrusions on the air filter 2 are entirely wrapped in the latch arms 10 on the air filter inlet pipe 1, no redundant contact occurs, and only the clamping surface 102 and the second side surface 201 need to be kept in contact to maintain stable connection.

The tool-less connection and separation of the first tubular member 3 and the second tubular member 4 can be achieved by the latch arm 10 and the locking projection 20 of the above structure, specifically, when the air cleaner intake duct 1 is connected to the air cleaner 2, namely, when the first tubular component 3 is inserted into the air outlet end of the air filter air inlet pipe 1 from bottom to top, or the air outlet end of the air filter air inlet pipe 1 is sleeved outside the air inlet end of the first tubular component 3 from top to bottom, locking projection 20 comes into progressive contact with latch arm 10 and radially compresses latch arm 10, which in turn causes the latch arm 10 to flip away from the locking projection 20, i.e., the relative movement described above, thereby allowing the latch arm 10 to clear the top of the locking projection 20, after the latch arm 10 has passed over the top of the locking projection 20, it will return under its own spring return force in a direction approaching the locking projection 20 until it forms a snap lock with the second side 201 of the locking projection 20. On the contrary, when dismantling empty intake pipe 1 from empty filter 2, workman or other operating personnel can strain intake pipe 1 to empty and exert axial separation effort, even when so that empty one end of giving vent to anger of straining intake pipe 1 breaks away from the one end of admitting air of first tubular component 3 from bottom to top, at the in-process that breaks away from, locking arch 20 equally can form radial extrusion to hasp arm 10, and then can make hasp arm 10 produce to the upset of keeping away from the protruding 20 direction of locking, so that hasp arm 10 can cross the protruding 20 tops of locking, and then make empty intake pipe 1 and the mutual break away from of first tubular component 3 of straining. Through this kind of mode, not only the installation is inserted easily, need not with the help of the instrument, also need not to remove empty intake pipe 1 that strains by hand with the help of the instrument promptly when dismantling in addition, and this need not carry out any operation to hasp arm 10 and can accomplish installation and dismantlement, has consequently eliminated hasp arm 10, especially hasp arm 10 that plastic material made, is destroyed by metal tool's risk in the dismantlement process.

The connection process of the connection structure is explained with reference to fig. 7 to 9. Fig. 7 to 9 show a connection process of the connection structure in the present invention, in which fig. 7 is a sectional view of the connection structure before connection, fig. 8 is a sectional view in connection, and fig. 9 is a sectional view of completion of connection.

As shown in fig. 7, first, the female-side guide surface 100 of the second tubular member 4 of the air filter inlet duct 1 and the guide inclined surface 203 of the first tubular member 3 of the air filter 2 come into contact with each other, and since these two surfaces are at the same inclination angle β with respect to the axial direction of the second tubular member 4 or the first tubular member 3, as shown in fig. 6, the contact of these two surfaces with each other serves as a positioning and guiding function.

As the installation and insertion process continues, the locking projection 20 on the first tubular member 3 of the air cleaner 2 forces the latch arms 10 on the second tubular member 4 of the air inlet filter 1 to deform and flip outwardly as shown in fig. 8. Since the air intake duct 1 and the air filter 2 are both made of plastic, this process can be performed without any structural damage. As the latch arm 10 of the air inlet filter 1 is turned outwardly as shown by the dotted arrow in fig. 8, the female-side straight mating surface 101 of the second tubular member 4 of the air inlet filter 1 and the male-side straight planar surface 202 of the first tubular member 3 of the air cleaner 2 come into contact with each other.

As the installation and insertion process continues, as shown in fig. 9, the straight mating surface 101 of the second tubular member 4 of the air cleaner inlet 1 and the straight male-side surface 202 of the first tubular member 3 of the air cleaner 2 are disengaged, and the latch arms 10 of the second tubular member 4 of the air cleaner inlet 1 return to their pre-deformed, inverted shapes. The female side bearing surface 102 of the second tubular member 4 of the air intake filter tube 1 and the male side second side surface 201201 of the air filter 2 are in contact engagement with each other. A gap is reserved between the female side second avoidance area 103 and the male side straight plane 202, and a gap is reserved between the first avoidance area 104 and the male side guide inclined plane 203. The locking projection 20 on the first tubular part 3 of the air filter 2 is entirely wrapped in the latch arm 10 on the second tubular part 4 of the air filter inlet pipe 1, and the female side clamping surface 102 and the male side second surface 201 on the air filter 2 are tightly contacted to form a stable connection. The assembly of the air intake duct 1 and the air filter 2 is completed.

The process of disassembling the air filter air inlet pipe 1 is the reverse process of installation, and a pulling force along the axial direction is applied to the air filter air inlet pipe 1, so that the air filter air inlet pipe 1 is pulled out outwards. The structure of the clasp goes through the process from fig. 9 to fig. 8, and then to fig. 7.

Furthermore, it should be noted that the features of the different exemplary embodiments of the invention may be combined with each other arbitrarily without departing from the scope of protection of the invention, as long as these features are not mutually exclusive.

Claims

1. A connection structure of an air intake system for connection of a first tubular member (3) and a second tubular member (4) of an air intake system, characterized in that the connection structure comprises a locking projection (20) on the first tubular member (3) and a latch arm (10) on the second tubular member (4) and cooperating with said locking projection (20) in a relatively movable manner, said locking projection (20) being capable of forcing said latch arm (10) to produce said relative movement for effecting locking and release with the locking projection (20) by means of movement of the first tubular member (3) and/or the second tubular member (4) in its own axial direction upon connection and disconnection of the first tubular member (3) and the second tubular member (4).

2. The connection structure of an intake system according to claim 1, wherein the locking projection (20) includes a first side surface (203) and a second side surface (201) arranged in the axial direction of the first tubular member (3), the second side surface (201) being opposite to the first side surface (203) on a side of the locking projection (20) facing away from the second tubular member (4), the latch arm (10) being latched against the second side surface (201) when the first tubular member (3) is connected to the second tubular member (4); the second side (201) is a bevel extending obliquely in the axial direction from the tip edge thereof in a direction away from the second tubular part (4) so as to force the latch arm (10) into said relative movement when the first tubular part (3) is separated from the second tubular part (4).

3. The connecting structure of an intake system according to claim 2, wherein the connecting structure achieves locking in such a manner that the latch arm (10) is held in contact with the second side surface (201) of the locking projection (20) with a clearance from the top and/or the first side surface (203) of the locking projection (20).

4. The connecting structure of an air intake system according to claim 2, wherein the first side surface (203) extends obliquely in a direction toward the second tubular member (4) in the axial direction from the tip end edge with respect to the second side surface (201), forming a guide slope capable of guiding the sliding of the latch arm (10) along the locking projection (20) and generating the relative movement when the first tubular member (3) and the second tubular member (4) are connected.

5. The connection structure of an intake system according to claim 4, wherein the first side surface (203) and the second side surface (201) are each inclined at an angle with respect to a central axis (L) of the first tubular member (3), and the second side surface (201) is inclined at an angle with respect to the central axis (L) of the first tubular member (3) that is greater than the angle at which the first side surface (203) is inclined with respect to the central axis (L) of the first tubular member (3).

6. The connection structure of an intake system according to claim 5, wherein the second side surface (201) is inclined at an angle of 45 ° to 80 ° with respect to the central axis (L) of the first tubular member (3).

7. The connection structure of an intake system according to claim 6, wherein the second side surface (201) is inclined at an angle of 60 ° with respect to the central axis (L) of the first tubular member (3).

8. The connection structure of an air intake system according to claim 5, wherein the first side surface (203) is inclined at an angle of 10 ° to 45 ° with respect to the central axis (L) of the first tubular member (3).

9. The connection structure of an intake system according to claim 8, wherein the first side surface (203) is inclined at an angle of 20 ° with respect to the central axis (L) of the first tubular member (3).

10. Connection arrangement according to claim 2, characterized in that the latch arm (10) effects said relative movement in a direction perpendicular to the axial direction of the second tubular part (4) in an elastically deformable manner.

11. The connection structure of an intake system according to claim 2, wherein the latch arm (10) includes a connection portion connected to the second tubular member (4) and a catching portion (40) connected to the connection portion, the catching portion (40) is an inclined structure in accordance with an inclination direction of the second side surface (201), and in the locked position, a side surface of the catching portion (40) on a side facing the locking projection (20) forms a catching surface (102) for catching and engaging with the second side surface (201) of the locking projection (20).

12. The connection structure of an intake system according to claim 11, wherein the connection portion includes a base portion (60), the base portion (60) being disposed in parallel with a central axis (D) of the second tubular member (4) and being connected with a body of the second tubular member (4).

13. The connection structure of an intake system according to claim 12, wherein the connection portion further includes an escape portion (50) located between the base portion (60) and the catching portion (40) and adapted to lock a clearance with a top and/or a first side surface (203) of the locking protrusion (20).

14. The connecting structure of an intake system according to claim 13, wherein the escape portion (50) is an inclined structure extending from the base portion (60) in the direction of the catching portion (40) in an inclined direction that coincides with or approaches an inclined direction of the first side surface (203) of the locking protrusion (20).

15. The connecting structure of an intake system according to claim 13, wherein the escape portion (50) includes a first escape region (104) and a second escape region (103) which are provided in this order from the base portion (60) toward the catching portion (40), and in the locked position, a first escape gap is formed between the first escape region (104) and the first side surface (203), and a second escape gap is formed between the second escape region (103) and the top of the locking protrusion (20).

16. The connection structure of the intake system according to claim 15, wherein the first avoidance gap and/or the second avoidance gap is 1 to 5 mm.

17. The connection structure of the intake system according to claim 16, wherein the first avoidance gap is 2mm, and the second avoidance gap is 2.2 mm.

18. The connecting structure of an intake system according to claim 11, wherein the latch arm (10) further includes a guide engagement portion connected to the engaging portion (40), the engaging portion (40) is located between the guide engagement portion and the connecting portion, the guide engagement portion includes at least a first guide portion (30) for slidably engaging with the first side surface (203) of the locking protrusion (20) and forming a guide when connected, the first guide portion (30) is an inclined structure corresponding to an inclination of the first side surface (203) of the locking protrusion (20), and a side surface of the first guide portion (30) facing the locking protrusion (20) forms a first guide inclined surface (100) engaging with the first side surface (203).

19. The connection structure of an intake system according to claim 18, wherein the guide engagement portion further includes a second guide portion (80) between the catching portion (40) and the first guide portion (30), the second guide portion (80) being capable of slidably engaging with the top of the locking projection (20) in a surface contact manner during the locking and releasing to effect transition of the latch arm (10) between the first side surface (203) and the second side surface (201) of the locking projection (20).

20. The connecting structure of an air intake system according to claim 19, wherein the top of the locking protrusion (20) is formed with a transition top surface (202) connected to both the first side surface (203) and the second side surface (201), the transition top surface (202) is a flat surface, and the side surface of the second guide portion (80) on the side facing the locking protrusion (20) is a fitting flat surface (102).

21. The connection structure of an intake system according to claim 20, wherein the transition top surface (202) is a straight plane parallel to a central axis (L) of the first tubular member (3).

22. The connection structure of an intake system according to claim 1, wherein an abutment shoulder (70) for abutment of the end portion of the first tubular member (3) to form a location is further provided on the second tubular member (4).

23. The connection structure of an intake system according to claim 1, wherein the latch arm (10) is provided integrally with the second tubular member (4).

24. A connection structure of an air intake system according to any one of claims 1 to 23, wherein the first tubular member (3) has a wall thickness (d1) of 2 to 4 mm.

25. The connection structure of an intake system according to claim 24, wherein the first tubular member (3) has a wall thickness (d1) of 2.2 mm.

26. The connection structure of an air intake system according to any one of claims 1 to 23, wherein the second tubular member (4) has a wall thickness (d2) of 1.5 to 3 mm.

27. The connection structure of an intake system according to claim 26, wherein the second tubular member (4) has a wall thickness (d2) of 2 mm.

28. The connection structure of an air intake system according to any one of claims 1 to 23, wherein the first tubular member (3) is a first tubular joint portion provided on the air cleaner (2) for connection with the air intake filter pipe (1), and the second tubular member (4) is a second tubular joint portion formed on the air outlet side of the air intake filter pipe (1) for connection with the air cleaner (2);

or the first tubular component (3) is a first tubular joint formed on the air outlet side of the air filter air inlet pipe (1) and used for being connected with the air filter (2), and the second tubular component (4) is a second tubular joint arranged on the air filter (2) and used for being connected with the air filter air inlet pipe (1).

29. An air intake system comprising an air filter (2) and an air intake filter (1), characterized in that the air filter (2) and the air intake filter (1) are connected by a connection structure of the air intake system according to any one of claims 1 to 28.

30. An air inlet system according to claim 29, characterized in that the air filter (2) is provided with a first tubular part (3) for connection with the air filter inlet tube (1), and that the air outlet side of the air filter inlet tube (1) forms a second tubular part (4) for plug-in engagement with the first tubular part (3).

31. An air inlet system according to claim 30, characterized in that the locking projection is provided on the first tubular part (3) and the latch arm is provided on the second tubular part (4), which latch arm cooperates with the locking projection when the first tubular part (3) and the second tubular part (4) are in plug-in engagement to achieve locking.