CN110578574A - Connecting structure of crankcase ventilation pipe, crankcase ventilation pipeline and vehicle - Google Patents

Abstract

The application provides a connection structure, crankcase ventilation pipeline and vehicle of crankcase ventilation pipe. The connecting structure comprises a first joint, a second joint connecting the crankcase ventilation pipe and the first joint, and a heating device arranged on the second joint and used for heating the crankcase ventilation pipe. Wherein the second joint is a segmented construction comprising at least a first segment and a second segment. The crankcase ventilation pipeline comprises a crankcase ventilation pipe and a connecting structure, and the connecting structure is matched with the crankcase ventilation pipe. The vehicle includes a crankcase, a crankcase ventilation duct, and the connection structure is mated with the crankcase ventilation duct.

Description

Connecting structure of crankcase ventilation pipe, crankcase ventilation pipeline and vehicle

Technical Field

The application relates to the technical field of vehicles, in particular to a connecting structure of a crankcase ventilation pipe, a crankcase ventilation pipeline and a vehicle.

Background

the crankcase ventilation pipe of the vehicle is communicated with the crankcase, and gas entering the crankcase can be discharged through the crankcase ventilation pipe. The end of the crankcase ventilation pipe is connected with the crankcase through the connecting joint and the male joint.

the structures at the two ends of the connecting joint are respectively matched with the crankcase ventilation pipe and the male joint to connect the crankcase ventilation pipe and the male joint. The connecting joint is of an integrated structure in the related art, and the two ends of the connecting joint are respectively processed into structures matched with the crankcase ventilation pipe and the male joint, so that the manufacturing and processing difficulty is high, and the processing cost is high.

Disclosure of Invention

The application provides a connection structure, crankcase ventilation pipeline and vehicle of crankcase ventilation pipe.

According to a first aspect of embodiments of the present application, there is provided a connecting structure of a crankcase ventilation duct, including a first joint, a second joint connecting the crankcase ventilation duct and the first joint, and a heating device provided on the second joint for heating the crankcase ventilation duct; wherein the second joint is a segmented construction comprising at least a first segment and a second segment.

Optionally, the first joint is provided with a first insertion head, and the second joint is provided with a first receiving space for receiving the first insertion head.

optionally, the first segment is provided with a first limiting portion, the second segment is provided with a second limiting portion, and the first limiting portion and the second limiting portion are used for limiting the position of the first insertion head in the first accommodating space.

Optionally, the first position-limiting part is movably disposed on the first segment.

Optionally, the first segment is further provided with a third limiting portion, the first joint comprises a positioning portion, and the positioning portion is limited between the first limiting portion and the third limiting portion.

optionally, the first segment is further provided with a fourth limiting part, and the third limiting part and the fourth limiting part form a groove; the second joint further comprises a sealing member disposed in the groove for sealing the first joint.

Optionally, an outer wall of the first insertion head of the first fitting is in abutting engagement with the seal.

optionally, the first section and the second section are fixed together by means of assembling or welding.

Optionally, the heating device is matched with the first segment, and the heating device comprises a heating module and a heating metal piece connected with the heating module to realize heat conduction.

Optionally, the second section comprises a base connected to the first section and an insert extending from the base that mates with the crankcase ventilation tube; the heat generating module is mounted on the base.

Optionally, the base is provided with a first accommodating cavity, the heating device further includes a heating terminal electrically connected to the heating module, and after the heating terminal is connected to the heating module, a free end of the heating terminal is located in the first accommodating cavity.

Optionally, the heating metal extends inwardly of the first section.

Optionally, the connecting structure is further provided with a diagnostic device of a diagnostic subsystem for determining whether the connecting structure is disconnected from the crankcase ventilation pipe, and the diagnostic device comprises a connecting switch, a diagnostic terminal electrically connected with the connecting switch, and a touch piece for closing the connecting switch.

Optionally, the touch piece is movably arranged on the second joint; when the first joint is connected with the second joint, the first joint is in contact with the touch piece to enable the touch piece to close the connection switch.

optionally, the first segment is provided with a second accommodating cavity, and after the diagnosis terminal is connected with the connecting switch, the free end of the diagnosis terminal is located in the second accommodating cavity.

According to a second aspect of embodiments of the present application, there is provided a crankcase ventilation line comprising a crankcase ventilation tube and the above-mentioned connection structure, the connection structure cooperating with the crankcase ventilation tube.

according to a third aspect of an embodiment of the present application, there is provided a vehicle comprising a crankcase, a crankcase ventilation duct connection as described above, the connection cooperating with the crankcase ventilation duct.

The application provides a connection structure, crankcase ventilation pipeline and vehicle of crankcase ventilation pipe, connection structure's second connects for the sectional type structure, includes first segmentation and second segmentation at least, compares with integral type structure, and when processing its inside structure on the second connects, the segmentable is processed, and the degree of difficulty of processing is lower, can reduce the processing cost of crankcase ventilation pipeline.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

the accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a cross-sectional view of a connection structure provided in accordance with an embodiment of the present application;

FIG. 2 is a cross-sectional view of another attachment structure provided in accordance with an embodiment of the present application;

FIG. 3 is a cross-sectional view of a crankcase ventilation conduit according to an embodiment of the present application.

The reference numerals in the figures are respectively:

10. A connecting structure;

11. A first joint;

111. a first insertion head;

112. A positioning part;

113. a second accommodating space;

114. a fifth limiting part;

115. A sixth limiting part;

12. A second joint;

121. A first segment;

1211. A first limiting part;

1212. A third limiting part;

1213. A fourth limiting part;

1214. A through hole;

1215. A groove;

122. A second section;

1221. A second limiting part;

1222. a base;

1223. an insertion portion;

1224. A bump;

1225. A first accommodating cavity;

123. A first accommodating space;

124. a second insertion head;

125. a connecting rod;

126. a limiting ring;

127. Accommodating grooves;

13. A seal member;

14. a heating device;

141. A heating terminal;

142. a heat generating module;

143. heating the metal piece;

15. A diagnostic device;

151. a connecting switch;

152. a diagnostic terminal;

153. A touch piece;

16. a crankcase ventilation duct;

17、ECU；

18. A housing member;

181. A second accommodating cavity;

182. A third accommodating cavity.

Detailed Description

reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

it should be understood that the terms "first," "second," and the like as used in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items.

the following describes a connecting structure of a crankcase ventilation pipe and a crankcase ventilation pipeline according to an embodiment of the present application in detail with reference to the drawings. The features of the following examples and embodiments can be supplemented or combined with each other without conflict.

Fig. 1 and 2 are schematic views of a crankcase ventilation duct connection 10 provided by the present application. The connecting structure 10 is applied to the field of vehicles.

Referring to fig. 1 and 2, the connecting structure 10 includes a first connector 11, a second connector 12 connecting the crankcase ventilation duct and the first connector 11, and a heating device 14 provided on the second connector 12 to heat the crankcase ventilation duct. The second joint 12 is a segmented structure, and includes at least a first segment 121 and a second segment 122. When the second joint 12 is used for processing the internal structure, the first section 121 and the second section 122 can be processed in a segmented manner, and the processing difficulty is reduced compared with the integrated structure.

in one embodiment, referring to fig. 1, the first joint 11 is provided with a first insertion head 111, and the second joint 12 is provided with a first receiving space 123 receiving the first insertion head 111 of the first joint 11. When the first joint 11 and the second joint 12 are connected, the first insertion head 111 is accommodated in the first accommodation space 123. In one embodiment, the first segment 121 is provided with a first position-limiting portion 1211, the second segment 122 is provided with a second position-limiting portion 1221, and the first position-limiting portion 1211 and the second position-limiting portion 1221 are used for limiting the position of the first insertion head 111 of the first connector 11 in the first receiving space 123. Alternatively, the first position-limiting part 1211 is a protrusion extending from the wall of the first accommodating space 123, and the second position-limiting part 1221 is a step perpendicular to the extending direction of the second segment 122. The first and second stoppers 1211 and 1221 limit the position of the first insertion head 111 of the first contact 11, so as to prevent the first insertion head 111 of the first contact 11 from moving greatly in the first receiving space 123, and to make the first contact 11 and the second contact 12 connected more firmly.

In one embodiment, the first segment 121 is further provided with a third position-limiting portion 1212, the first joint 11 includes a positioning portion 112, and the positioning portion 112 is limited between the first position-limiting portion 1211 and the third position-limiting portion 1212. The third limiting portion 1212 is a protrusion extending from a wall of the first accommodating space 123, and the positioning portion 112 is a protrusion on the first insertion head 111 of the first joint 11. The positioning portion 112 is clamped between the first position-limiting portion 1211 and the third position-limiting portion 1212, so that the movement between the first position-limiting portion 1211 and the third position-limiting portion 1212 in the first receiving space 123 can be further limited.

in an alternative embodiment, the first position-limiting portion 1211 is movably disposed on the first segment 121. Specifically, a through hole 1214 is formed on the wall of the first segment 121, and the first position-limiting portion 1211 can move in the through hole 1214. When the first stopper 1211 moves in the through hole 1214 in a direction away from the first receiving space 123, the positioning portion 112 can enter the first receiving space 123. After the positioning portion 112 enters the first receiving space 123, the first position-limiting portion 1211 moves in the through hole 1214 toward the first receiving space 123, so that the positioning portion 112 is clamped between the first position-limiting portion 1211 and the third position-limiting portion 1212. By controlling the length of the first stopper 1211 extending into the first receiving space 123, the first receiving space 123 can receive the first insertion head 111 of the first contact 11 having different sizes, and the second contact 12 can be connected to the first contacts 11 having different sizes, which results in a wide range of use. Alternatively, positioning portion 112 is an annular structure. In other embodiments, the positioning portion 112 may also be a plurality of protrusions evenly distributed on the outer wall of the first insertion head 111 along the circumferential direction. Optionally, the inner wall of the first segment 121 is provided with a plurality of uniformly distributed through holes 1214 along the circumferential direction. Correspondingly, the first segment 121 includes a plurality of first position-limiting portions 1211, and the plurality of first position-limiting portions 1211 are disposed in the plurality of through holes 1214 in a one-to-one correspondence.

In one embodiment, the first segment 121 further has a fourth position-limiting portion 1213, and the third position-limiting portion 1212 and the fourth position-limiting portion 1213 form a groove 1215. The coupling structure 10 further includes a sealing member 13 disposed in the recess 1215 for sealing against the first connector 11. The outer wall of the first insertion head 111 of the first joint 11 is in abutting engagement with the seal 13. The seal 13 can prevent contamination of the vehicle interior due to leakage of gas in the crankcase through the gap between the first joint 11 and the first section 121. Optionally, the sealing member 13 is a rubber sealing ring. In other embodiments, the sealing element 13 may also be a silicone sealing ring, or a sealing ring made of other materials and having elasticity. Optionally, a plurality of third limiting portions 1212 and a plurality of fourth limiting portions 1213 are disposed on the inner wall of the first segment 121, the plurality of third limiting portions 1212 are uniformly distributed along the circumferential direction, and the plurality of fourth limiting portions 1213 are uniformly distributed along the circumferential direction.

In one embodiment, first section 121 and second section 122 are secured together by fitting or welding. Alternatively, the first segment 121 and the second segment 122 are respectively provided with a threaded hole, and the first segment 121 and the second segment 122 can be assembled by screw-fitting with the threaded hole. In other embodiments, first segment 121 and second segment 122 may be assembled by other connections. The first segment 121 and the second segment 122 are connected by means of assembly, so that the operation is convenient, and the disassembly of the first segment 121 and the second segment 122 is convenient. Welding the first segment 121 and the second segment 122 can ensure the firmness of the connection between the two.

in one embodiment, one end of the crankcase ventilation tube is connected to the first connector 11 through the second connector 12, and the other end is connected to the first connector 11 by welding or other detachable connection. In other embodiments, both ends of the crankcase ventilation duct may be connected to the first joint 11 through the second joint 12, respectively.

In one embodiment, the heating device 14 includes a heat generating module 142 and a heating metal member 143 connected to the heat generating module 142 for heat conduction. When the heating module 142 is connected with the power supply, the heating module 142 generates heat, and conducts the heat to the heating metal piece 143, the heat of the heating metal piece 143 is used for heating the first section 121 to enable the temperature in the pipeline of the first section 121 to rise, the first section 121 conducts the heat to the gas in the crankcase ventilation pipe, the temperature of the gas in the crankcase ventilation pipe rises, the blockage of the crankcase ventilation pipe due to the fact that the water vapor in the crankcase ventilation pipe is frozen is avoided, and the normal work of the crankcase ventilation pipe is guaranteed.

In another alternative embodiment, the heating device 14 includes a heat generating module 142, and the heat generating module 142 is a carbon film. The carbon film provides thermal energy to the first segment 121. The carbon film increases in temperature when energized, generates heat, and conducts the heat to the first segment 121. The first segment 121 is directly heated using the carbon film, simplifying the structure of the heating device 14.

the heating module 142 may be electrically connected to a power supply through a cable. In other embodiments, the heating device 14 may further include a heating terminal 141 electrically connected to the heat generating module 142, and the heat generating module 142 is connected to the power supply through the heating terminal 141.

Further, the second segment 122 includes a base 1222 connected to the first segment 121 and an insert 1223 extending from the base 1222 to mate with a crankcase ventilation tube; the heat generating module 142 and the heating terminal 141 are mounted on the base 1222. Optionally, a plurality of projections 1224 are disposed on the outer wall of the insertion portion 1223 in a uniform distribution. Correspondingly, the inner wall of the crankcase ventilation tube is provided with a receiving structure matching the projection 1224. When the insert 1223 of the second section 122 is inserted into the crankcase ventilation tube, the projection 1224 on the outer wall of the insert 1223 snaps into a receiving structure on the inner wall of the crankcase ventilation tube. Therefore, the second joint 12 can be quickly connected with the crankcase ventilation pipe, and the connection between the second joint and the crankcase ventilation pipe is firm. The integration of the connection structure 10 can be improved by installing the heat generating module 142 and the heating terminal 141 in the base 1222.

further, the base 1222 is provided with a first receiving cavity 1225, and after the heating terminal 141 is connected to the heat generating module 142, the free end thereof is located in the first receiving cavity 1225. The first accommodating cavity 1225 has an opening, and the free end of the heating terminal 141 is located at the opening of the first accommodating cavity 1225, so that the free end of the heating terminal 141 is connected to a power supply.

In one embodiment, the heating metal member 143 extends toward the interior of the first section 121, and when the first joint 11 is mated with the second joint 12, the heating metal member 143 is positioned in the pipe of the first joint 11. The heating metal member 143 raises the temperature of the pipe of the first joint 11. The conduit of the first connector 11 conducts heat to the gas inside the crankcase ventilation tube, raising the temperature of the gas inside the crankcase ventilation tube. Alternatively, the heating metal 143 is a metal rod, sheet metal, or other shape or structure suitable for conducting heat into the crankcase ventilation tube. In other embodiments, the heating metal 143 may also be disposed outside of the crankcase ventilation tube.

in one embodiment, the connection structure 10 further comprises a diagnostic device 15 of a diagnostic subsystem for determining whether the connection structure 10 is disconnected from the crankcase ventilation duct, wherein the diagnostic device 15 comprises a connection switch 151, a diagnostic terminal 152 electrically connected to the connection switch 151, and a triggering member 153 for closing the connection switch 151. Further, the contact member 153 is disposed on the first segment 121 and extends into the first receiving space 123, the first insertion head 111 is located in the first receiving space 123, and the first insertion head 111 contacts the contact member 153 to close the connection switch 151. When the first connector 11 is connected to the second connector 12 and the first insertion head 111 enters the first receiving space 123, the first insertion head 111 pushes the contact member 153 to contact the connection switch 151, so that the connection switch 151 is closed. When the first connector 11 is disconnected from the second connector 12, the first insertion head 111 is disengaged from the contact member 153, the contact member 153 is disengaged from the connection switch 151, and the connection switch 151 is disconnected. In use, the connection switch 151 and the diagnosis terminal 152 are connected to the ECU, respectively, so that the connection switch 151, the diagnosis terminal 152, and the ECU form a circuit. The ECU may detect a voltage or current signal when the connection switch 151 is closed, and may not detect a voltage or current signal when the connection switch 151 is open.

In one embodiment, the connection structure 10 further includes a receiving part 18 connected to the first segment 121, the receiving part 18 is provided with a second receiving cavity 181 and a third receiving cavity 182, and the free end of the diagnosis terminal 152 is located in the second receiving cavity 181 after being connected to the connection switch 151. The second receiving cavity 181 has an opening, and the free end of the diagnostic terminal 152 is located at the opening of the second receiving cavity 181, so that the free end of the diagnostic terminal 152 is connected with the ECU. The third receiving cavity 182 is communicated with the first receiving space 123 of the second connector 12, and the connection switch 151 is located in the third receiving cavity 182. When the first insertion head 111 is located in the first receiving space 123, one end of the contact member 153 is pushed into the third receiving cavity 182 and contacts the connection switch 151, so that the connection switch 151 is closed. Alternatively, the connection switch 151 may be a push button switch or a micro switch.

In another embodiment, referring to fig. 2, the second joint 12 is provided with a second insertion head 124, and the first joint 11 is provided with a second receiving space 113 that receives the second insertion head 124. When the first connector 11 and the second connector 12 are connected, the second insertion head 124 is received in the second receiving space 113.

in an alternative embodiment, the second joint 12 further comprises a connecting rod 125 and a stop collar 126, and the first segment 121 is connected to the stop collar 126 by the connecting rod 125. The inner wall of the first joint 11 is provided with a fifth limiting portion 114, and the outer wall thereof is provided with a sixth limiting portion 115. When the second insertion head portion 124 is received in the second receiving space 113, the second insertion head portion 124 abuts against and engages with the fifth stopper portion 114, and the sixth stopper portion 115 abuts against and engages with the stopper ring 126, so that the second insertion head portion 124 is restricted in the second receiving space 113. Optionally, the second joint 12 comprises a plurality of connecting rods 125, the plurality of connecting rods 125 being evenly distributed along the circumferential direction.

In an alternative embodiment, the outer wall of the second insertion head 124 is provided with a receiving groove 127, the sealing element 13 is received in the receiving groove 127, and the inner wall of the first joint 11 is in abutting engagement with the sealing element 13. The seal 13 may effect a seal between the first joint 11 and the first section 121.

In an alternative embodiment, the triggering member 153 is movably disposed on the connecting rod 125. When the first connector 11 is connected to the second connector 12, the first connector 11 pushes the contact member 153 to contact the connection switch 151, so that the connection switch 151 is closed. When the first connector 11 is disconnected from the second connector 12, the first connector 11 is disconnected from the contact member 153, the contact member 153 is disconnected from the connection switch 151, and the connection switch 151 is disconnected.

Other structures of the first joint 11 and the second joint 12 are similar to the corresponding structures and connection manners of the above-described embodiments, and are not described again.

the application provides a connection structure 10, because second joint 12 includes first segmentation 121 and second segmentation 122 at least, compare with integral type structure, but the segmentation is processed when processing its inside structure on second joint 12, and the degree of difficulty is lower, can reduce connection structure 10's processing cost.

Fig. 3 is a schematic view of a crankcase ventilation circuit 20 provided by the present application. Referring to fig. 2, the crankcase ventilation line 20 includes the crankcase ventilation tube 16 and the connection structure 10 described above, the connection structure 10 cooperating with the crankcase ventilation tube 16.

in one embodiment, the crankcase ventilation circuit 20 further includes an ECU 17. ECU17 is electrically connected to connection switch 151 and diagnostic terminal 152, and connection switch 151, diagnostic terminal 152, and ECU17 form a circuit. The ECU17 may detect a voltage or current signal when the connection switch 151 is closed, and the ECU17 may not detect a voltage or current signal when the connection switch 151 is open.

The application also provides a vehicle, including crankcase, crankcase ventilation pipe and foretell connection structure, connection structure and crankcase ventilation pipe cooperation.

although the present application has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application, and all changes, substitutions and alterations that fall within the spirit and scope of the application are to be understood as being covered by the following claims.

the disclosure of this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office official records and records.

Claims (17)

1. The utility model provides a connection structure of crankcase ventilation pipe which characterized in that: the crankcase ventilation pipe heating device comprises a first joint, a second joint and a heating device, wherein the second joint is used for connecting the crankcase ventilation pipe and the first joint, and the heating device is arranged on the second joint and used for heating the crankcase ventilation pipe; wherein the second joint is a segmented construction comprising at least a first segment and a second segment.

2. the connection structure according to claim 1, wherein: the first joint is provided with a first insertion head, and the second joint is provided with a first accommodating space for accommodating the first insertion head.

3. The connecting structure according to claim 2, wherein: the first section is provided with a first limiting part, the second section is provided with a second limiting part, and the first limiting part and the second limiting part are used for limiting the position of the first insertion head in the first accommodating space.

4. The connection structure according to claim 3, wherein: the first limiting part is movably arranged on the first segment.

5. The connecting structure according to claim 3, wherein: the first segment is further provided with a third limiting part, the first joint comprises a positioning part, and the positioning part is limited between the first limiting part and the third limiting part.

6. The connecting structure according to claim 5, wherein: the first subsection is also provided with a fourth limiting part, and the third limiting part and the fourth limiting part form a groove; the second joint further comprises a sealing member disposed in the groove for sealing the first joint.

7. The connecting structure according to claim 6, wherein: an outer wall of the first insertion head of the first fitting is in abutting engagement with the seal.

8. The connecting structure according to claim 1, wherein: the first section and the second section are fixed together through assembling or welding.

9. The connecting structure according to claim 1, wherein: the heating device is matched with the first section, and comprises a heating module and a heating metal piece connected with the heating module to realize heat conduction.

10. The connecting structure according to claim 9, wherein: the second section includes a base connected to the first section and an insert extending from the base that mates with the crankcase ventilation tube; the heat generating module is mounted on the base.

11. The connecting structure according to claim 10, wherein: the base part is provided with a first accommodating cavity, the heating device further comprises a heating terminal electrically connected with the heating module, and after the heating terminal is connected with the heating module, the free end of the heating terminal is located in the first accommodating cavity.

12. The connecting structure according to claim 9, wherein: the heating metal member extends toward the inside of the first segment.

13. The connecting structure according to claim 1, wherein: the connecting structure is also provided with a diagnosis device of a diagnosis subsystem for judging whether the connecting structure is disconnected with the crankcase ventilation pipe or not, and the diagnosis device comprises a connecting switch, a diagnosis terminal electrically connected with the connecting switch and a touch piece for closing the connecting switch.

14. The connecting structure according to claim 13, wherein: the touch piece is movably arranged on the second joint; when the first joint is connected with the second joint, the first joint is in contact with the touch piece to enable the touch piece to close the connection switch.

15. the connecting structure according to claim 14, wherein: the first section is provided with a second accommodating cavity, and after the diagnosis terminal is connected with the connecting switch, the free end of the diagnosis terminal is positioned in the second accommodating cavity.

16. A crankcase ventilation pipeline which characterized in that: comprising a crankcase ventilation duct and a connection structure as claimed in any one of claims 1 to 15, said connection structure cooperating with said crankcase ventilation duct.

17. a vehicle, characterized in that: comprising a crankcase, a crankcase ventilation duct and a connection as described in any one of the claims 1-15, which connection cooperates with the crankcase ventilation duct.