Plastic air inlet pipe structure of diesel engine

Abstract

The utility model discloses a diesel engine plastic air inlet pipe structure which comprises an upper shell and a lower shell which are formed in an injection molding mode, the upper shell is connected with the lower shell, a cavity of the lower shell is communicated with a cavity of the upper shell through an air inlet pipe, a plurality of installation holes are formed in the upper shell, a plurality of through holes are formed in the lower shell, and threaded sleeves are embedded in the installation holes. The threaded sleeve comprises a sleeve, an internal thread is arranged on the sleeve, a plurality of gear rings are arranged on the outer circumference of the sleeve, and the gear rings are arranged at intervals in the axial direction of the sleeve. The utility model has the beneficial effects that the upper shell and the lower shell which are formed by injection molding are adopted, the thread bushing is directly embedded into the upper shell during injection molding, and the tooth rings which are arranged at intervals are arranged on the thread bushing, so that the circumferential and axial movement of the thread bushing is avoided, and the reliability of connection between the thread bushing and parts is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a diesel engine air inlet pipe, in particular to a diesel engine plastic air inlet pipe structure. BACKGROUND

[0002] The air inlet pipe of the common diesel engine is die-cast aluminum, and the surface connected with the cylinder cover and the air inlet pipe needs to be assembled with a separate sealing gasket, which is high in cost and affects the assembly efficiency of the whole machine.

[0003] The inventor has researched for a long time and has developed an air inlet pipe formed by injection molding, thereby overcoming the defects of high cost and low assembly efficiency, but since the shell is formed by injection molding, the structural strength is not good, especially when connected with other rigid parts such as high-pressure oil pipes, the connection between the high-pressure oil pipe and the shell is prone to wear, and after connection, the reliability of the connection cannot be guaranteed, therefore, it is urgent to make secondary improvement on the air inlet pipe. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects of the prior art and providing a diesel engine plastic air inlet pipe structure.

[0005] The utility model discloses a diesel engine plastic air inlet pipe structure, which is formed by injection molding, and the upper shell and the lower shell are connected, and the cavity of the lower shell is communicated with the cavity of the upper shell through the air inlet pipe.

[0006] Optionally, an annular groove is formed at the air inlet of the upper shell, a first sealing ring is installed in the annular groove, an annular groove is also formed at the air outlet of the lower shell, and a second sealing ring is installed in the annular groove of the lower shell.

[0007] Optionally, the first sealing ring and the second sealing ring are the same in structure, the first sealing ring comprises a sealing ring body, a plurality of convex ribs are arranged on the inner and outer sidewalls of the sealing ring body, a positioning block is arranged on the outer sidewall of the sealing ring, and the upper shell and the lower shell are provided with positioning grooves corresponding to the positioning block.

[0008] Optionally, the first sealing ring is an O-shaped sealing ring, the convex ribs are uniformly distributed on the same circumference, and the convex ribs on the inner and outer sidewalls of the sealing ring body correspond to each other.

[0009] Optionally, a reinforcing sleeve is installed in the through hole.

[0010] Optionally, reinforcing ribs are arranged on the upper shell and the lower shell.

[0011] Optionally, the mounting holes include high-pressure oil pipe mounting holes, water outlet pipe mounting holes, engine wire harness mounting holes, BPS sensor mounting holes, preheating wire harness mounting holes, the high-pressure oil pipe mounting holes are used for mounting high-pressure oil pipes, the water outlet pipe mounting holes are used for mounting water outlet pipes, the engine wire harness mounting holes are used for mounting engine wire harnesses, the BPS sensor mounting holes are used for mounting BPS sensors, and the preheating wire harness mounting holes are used for mounting preheating wire harnesses.

[0012] Optionally, the tooth ring is at least three.

[0013] The utility model has the advantages that: the air inlet pipe structure of the utility model adopts the upper shell and the lower shell which are injection molded, and the threaded sleeve is directly embedded in the upper shell during injection molding, and the threaded sleeve is provided with a tooth ring which is arranged at intervals, so that the threaded sleeve is prevented from moving in the circumferential and axial directions, and the reliability of the connection between the threaded sleeve and the parts is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model discloses a structure diagram Figure 1 ;

[0015] Figure 2 The utility model discloses a structure diagram Figure 2 ;

[0016] Figure 3 The utility model discloses a structure diagram Figure 3 ;

[0017] Figure 4 The utility model discloses a structure diagram Figure 4 ;

[0018] Figure 5 It is the sectional view schematic drawing of A-A in Figure 3 ;

[0019] Figure 6 It is the sectional view schematic drawing of B-B in Figure 4 ;

[0020] Figure 7 It is the structure schematic drawing of threaded sleeve;

[0021] Figure 8 It is the structure schematic drawing of sealing ring;

[0022] In the drawing, 1-threaded sleeve, 2-reinforcing sleeve, 3-first sealing ring, 5-air inlet pipe, 6-through hole, 7-second sealing ring, 8-annular groove, 9-positioning groove, 10-upper shell, 20-lower shell, 11-high-pressure oil pipe mounting hole, 12-water outlet pipe mounting hole, 13-engine wire harness mounting hole, 14-BPS sensor mounting hole, 15-reinforcing rib, 16-preheating wire harness mounting hole, 21-tooth ring, 22-positioning block, 23-convex rib. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] AsFigures 1-4 As shown in the figure, a diesel engine plastic intake pipe structure includes an injection molded upper shell 10 and a lower shell 20, the upper shell 10 and the lower shell 10 are connected, and the cavity of the lower shell 20 is communicated with the cavity of the upper shell 10 through the intake pipe 5, a plurality of mounting holes are formed on the upper shell 10, and a plurality of through holes 6 are formed on the lower shell 20, such as Figure 5 As shown in the figure, a threaded sleeve 1 is embedded in the mounting hole, the threaded sleeve 1 includes a sleeve, and an internal thread is formed on the sleeve, such as Figure 7 As shown in the figure, a plurality of tooth rings 21 are formed on the outer circumference of the sleeve, and the tooth rings 21 are arranged in the axial direction of the sleeve, in this embodiment, the threaded sleeve 1 is a rigid member, which is machined by machining first, further, the tooth rings 21 on the threaded sleeve 1 are at least three, that is, the threaded sleeve 1 has a plurality of grooves, further, the diameter of the circumference where the groove is located is smaller than the diameter of the circumference where the tooth ring 21 is located, when the upper shell 10 is injection molded, the threaded sleeve 1 is placed in the corresponding position of the injection mold, then the upper shell 10 is injection molded, after the upper shell 10 is formed, the threaded sleeve 1 is embedded in the upper shell 10, thereby facilitating the installation of the upper shell 10 and other components, further, the mounting hole includes a high-pressure oil pipe mounting hole 11, a water outlet pipe mounting hole 12, an engine wire harness mounting hole 13, a BPS sensor mounting hole 14, and a preheating wire harness mounting hole 16, that is, the threaded sleeve 1 is embedded in the high-pressure oil pipe mounting hole 11, the water outlet pipe mounting hole 12, the engine wire harness mounting hole 13, the BPS sensor mounting hole 14, and the preheating wire harness mounting hole 16, the high-pressure oil pipe is threadedly connected in the high-pressure oil pipe mounting hole 11, the water outlet pipe is threadedly connected in the water outlet pipe mounting hole 12, the engine wire harness is threadedly connected in the engine wire harness mounting hole 13, the BPS sensor is threadedly connected in the BPS sensor mounting hole 14, and the preheating wire harness is threadedly connected in the preheating wire harness mounting hole.

[0030] In this embodiment, as shown in Figure 1 and Figure 4 As shown in the figure, an annular groove 8 is formed at the air inlet of the upper shell 10, a first sealing ring 3 is installed in the annular groove 8, an annular groove 8 is also formed at the air outlet of the lower shell 20, a second sealing ring 7 is installed in the annular groove 8 of the lower shell 20, further, the first sealing ring 3 and the second sealing ring 7 have the same structure, and the first sealing ring 3 includes a sealing ring body, such as Figure 8As shown, the inner and outer sidewalls of the sealing ring body are provided with a plurality of convex ribs 23, and the outer sidewall of the sealing ring is provided with a protruding positioning block 22, the upper shell 10 and the lower shell 20 are provided with a positioning groove 9 corresponding to the positioning block 22, when installing, the sealing ring is first extruded in the corresponding annular groove 8, due to the existence of the convex rib 23, the convex rib 23 is deformed, so that the sealing ring can be well clamped in the annular groove 8, avoiding the sealing ring from falling off, and through the positioning of the positioning block 22 and the positioning groove 9, the installation position of the sealing ring can be fixed, further, the first sealing ring 3 is an O-shaped sealing ring, the convex ribs 23 are uniformly distributed on the same circumference, and the convex ribs 23 on the inner and outer sidewalls of the sealing ring body correspond to each other, that is, in the same axial direction, the inner side of the sealing ring has the convex rib 23 protruding inward, and the outer side of the sealing ring has the convex rib 23 protruding outward, so that when the sealing ring is installed, the contact area of the sealing ring and the annular groove 8 can be reduced, so that the sealing ring can be easily extruded into the annular groove 8, and because the convex rib 23 is closely fitted with the sidewall of the annular groove 8, the sealing ring can also be prevented from falling out of the annular groove 8, and because of the existence of the convex rib 23, when the sealing ring is not axially extruded, the sealing ring between two adjacent convex ribs 23 is not in contact with the annular groove 8, and has a gap, at this time, the sealing ring can be easily taken out by using a special tool, such as an iron tool with a hook.

[0031] In the embodiment, because the upper shell 10 and the lower shell 20 are both injection molded parts, the structural strength is low, and after relative displacement with the rigid part, the through hole 6 of the lower shell 20 is easy to be damaged, therefore, as shown, Figure 6 A reinforcing sleeve 2 is installed in the through hole 6, preferably, the reinforcing sleeve 2 is a steel sleeve, and in order to improve the structural strength of the upper shell 10 and the lower shell 20, reinforcing ribs 15 are arranged on the upper shell 10 and the lower shell 20.

[0032] In the embodiment, three blind holes are also arranged on the end face of the upper shell 10, the blind holes are distributed on the outer side of the annular groove 8, and threaded sleeves 1 are embedded in the blind holes, the lower shell 20 has nine through holes 6, and the reinforcing sleeve 2 is installed in the corresponding through hole 6 through interference fit, the reinforcing sleeve 2 is used to bear the flange pressure of the bolt, in the embodiment, the inner diameter of the reinforcing sleeve 2 is φ7mm, the outer diameter is φ10mm, and the height is 20mm, and the total height of the threaded sleeve 1 is 15mm, the diameter at the top of the tooth ring 21 is φ10mm, and the diameter at the bottom of the tooth ring 21 is φ8.5mm.

[0033] The utility model has been described in detail with reference to the foregoing embodiments, and those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A plastic intake pipe structure for a diesel engine, comprising an upper housing and a lower housing formed by injection molding, wherein the upper housing and the lower housing are connected, and the cavity of the lower housing and the upper housing are connected through an intake pipe, wherein the upper housing has a plurality of mounting holes, and the lower housing has a plurality of through holes, characterized in that: The mounting hole is fitted with a threaded sleeve, which includes a sleeve with an internal thread. The sleeve has a plurality of toothed rings on its outer circumference, and the toothed rings are spaced apart along the axial direction of the sleeve.

2. The structure of a plastic intake pipe for a diesel engine according to claim 1, characterized in that: An annular groove is provided at the air inlet of the upper housing, and a first sealing ring is installed in the annular groove. An annular groove is also provided at the air outlet of the lower housing, and a second sealing ring is installed in the annular groove of the lower housing.

3. The structure of a plastic intake pipe for a diesel engine according to claim 2, characterized in that: The first sealing ring and the second sealing ring have the same structure. The first sealing ring includes a sealing ring body. The inner and outer walls of the sealing ring body are provided with several protruding ridges. The outer wall of the sealing ring is provided with a protruding positioning block. The upper shell and the lower shell are provided with positioning grooves corresponding to the positioning blocks.

4. The structure of a plastic intake pipe for a diesel engine according to claim 3, characterized in that: The first sealing ring is an O-ring, and the protrusions are evenly distributed on the same circumference, with the protrusions on the inner and outer walls of the sealing ring body corresponding to each other.

5. A diesel engine plastic intake manifold structure according to any one of claims 1 to 4, characterized in that: A reinforcing sleeve is installed inside the through hole.

6. A diesel engine plastic intake manifold structure according to any one of claims 1 to 4, characterized in that: Both the upper and lower shells are provided with reinforcing ribs.

7. A diesel engine plastic intake manifold structure according to any one of claims 1 to 4, characterized in that: The mounting holes include a high-pressure oil pipe mounting hole, a water outlet pipe mounting hole, an engine wiring harness mounting hole, a BPS sensor mounting hole, and a preheating wiring harness mounting hole. A high-pressure oil pipe is installed in the high-pressure oil pipe mounting hole, a water outlet pipe is installed in the water outlet pipe mounting hole, an engine wiring harness is installed in the engine wiring harness mounting hole, a BPS sensor is installed in the BPS sensor mounting hole, and a preheating wiring harness is installed in the preheating wiring harness mounting hole.

8. A diesel engine plastic intake manifold structure according to any one of claims 1 to 4, characterized in that: The toothed rings are at least three in number.

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