An injector bushing

Abstract

The utility model discloses an injector bushing. The injector bushing of the utility model comprises an injector bushing body, and the injector bushing body is of a split structure. The injector bushing body includes an upper bushing and a lower bushing. A threaded portion is provided at the lower end of the lower bushing, and a thread is provided on the outer peripheral surface of the threaded portion. The injector bushing body of the injector bushing of the utility model is of a split structure. The injector body includes an upper bushing and a lower bushing, and the upper bushing and the lower bushing are processed separately. Compared with the prior art in which the injector bushing body is of an integral structure, the requirements for geometric tolerances such as coaxiality and perpendicularity of the injector bushing of the utility model are reduced, and the interference risk during installation is also reduced. As a result, the processing and installation difficulties of the injector bushing of the utility model are reduced, and the production and use costs of the injector bushing of the utility model are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, and in particular relates to an injector bushing. Background Technology

[0002] The injector bushing is installed in the cylinder head 5 of the internal combustion engine. The injector bushing is sealed to the cylinder head 5, separating the water chamber 52 of the cylinder head 5 from the injector and the combustion chamber. At the same time, the injector bushing is also sealed to the injector, separating the injector body from the combustion chamber and providing guidance for the installation of the injector.

[0003] Currently, injector bushings are all integral structures, generally processed from a single piece of corrosion-resistant material bar. The material is expensive, has high wear and tear, and the perpendicularity of the positioning platform and the central axis of the injector bushing, as well as the coaxiality of the injector bushing, are required to be high. The longer the injector bushing is, the more difficult it is to guarantee the form and position tolerances. In addition, the longer the injector bushing is, the greater the risk of interference during installation. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this utility model provides an injector bushing. The requirements for coaxiality, perpendicularity and other geometric tolerances of the injector bushing of this utility model are reduced, and the risk of interference during installation is also reduced. As a result, the processing and installation difficulty of the injector bushing of this utility model is reduced, and the production and use costs of the injector bushing of this utility model are reduced.

[0005] To address the problems existing in the prior art, this utility model provides an injector bushing, comprising: an injector bushing body, wherein the injector bushing body is a split structure, the injector bushing body includes an upper bushing and a lower bushing, the lower end of the lower bushing is provided with a threaded portion, and the outer peripheral surface of the threaded portion is provided with threads.

[0006] Furthermore, the lower bushing includes a large-diameter section and a small-diameter section connected together, the threaded portion is located in the small-diameter section, and a positioning platform is provided at the lower end of the large-diameter section.

[0007] Furthermore, the upper end of the large-diameter section is provided with multiple notches, which are arranged in a ring.

[0008] Furthermore, the outer circumferential surface of the upper bushing is provided with an upper bushing mounting groove.

[0009] Furthermore, the outer circumferential surface of the lower bushing is provided with a lower bushing mounting groove.

[0010] Furthermore, the upper bushing is provided with an oil hole.

[0011] Furthermore, the injector bushing also includes a pressure-holding assembly.

[0012] Furthermore, the pressing assembly includes a pressing block and a screw, the screw being threaded onto the pressing block.

[0013] Furthermore, the upper bushing mounting groove is provided in two places.

[0014] Furthermore, there are two mounting slots for the lower bushing.

[0015] The beneficial effects achieved by this utility model due to the adoption of the above technical solution are as follows:

[0016] The injector bushing of this utility model includes an injector bushing body, which is a split structure. The injector bushing body includes an upper bushing and a lower bushing. The lower end of the lower bushing is provided with a threaded portion, and the outer circumferential surface of the threaded portion is provided with threads. The injector bushing body of this utility model has a split structure, comprising an upper bushing and a lower bushing, which are machined separately. Compared to the existing technology where the injector bushing body is a single, integrated structure, the requirements for coaxiality, perpendicularity, and other geometric tolerances of the injector bushing of this utility model are reduced, and the risk of interference during installation is also reduced. This simplifies the machining and installation of the injector bushing of this utility model, thereby reducing the production and usage costs. Attached Figure Description

[0017] Figure 1 This is an exploded view of the injector bushing of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the injector bushing of this utility model;

[0019] Figure 3 This is a structural schematic diagram of the injector bushing of this utility model in use.

[0020] In the diagram: 1. Screw; 2. Pressure block; 3. Upper bushing; 31. Oil hole; 32. Upper bushing mounting groove; 4. Lower bushing; 41. Notch; 42. Lower bushing mounting groove; 43. Threaded part; 44. Positioning platform; 5. Cylinder head; 51. Oil passage; 52. Water cavity; 6. Sealing ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Depend on Figure 1 as well as Figure 2As shown in the figure, this embodiment discloses an injector bushing, which includes an injector bushing body. The injector bushing body has a split structure and includes an upper bushing 3 and a lower bushing 4. The lower end of the lower bushing 4 is provided with a threaded portion 43, and the outer peripheral surface of the threaded portion 43 is provided with threads.

[0023] The lower bushing 4 comprises a large-diameter section and a small-diameter section connected together, preferably a one-piece molded structure. The threaded portion 43 is located in the small-diameter section, and a positioning platform 44 is provided at the lower end of the large-diameter section.

[0024] The upper end of the large-diameter section is provided with multiple notches 41, which are arranged in a ring.

[0025] An upper bushing mounting groove 32 is provided on the outer peripheral surface of the upper bushing 3. Preferably, two upper bushing mounting grooves 32 are provided.

[0026] An oil hole 31 is also provided in the upper bushing 3.

[0027] A lower bushing mounting groove 42 is provided on the outer peripheral surface of the lower bushing 4. Preferably, two lower bushing mounting grooves 42 are provided.

[0028] Preferably, the injector bushing further includes a clamping assembly. The clamping assembly includes a clamping block 2 and a screw 1, the screw 1 being threaded onto the clamping block 2.

[0029] In the present invention, the injector bushing is used with the upper bushing 3 for oil isolation and the lower bushing 4 for water isolation. Therefore, only the lower bushing 4 needs to use a high-cost corrosion-resistant material (such as 06Cr19Ni10), while the upper bushing 3 can use a general material (such as 45 steel). Moreover, the diameter of the upper bushing 3 changes little, and it can be processed using pipes, reducing waste and thus significantly reducing costs. In addition, after the injector bushing body is divided into the upper bushing 3 and the lower bushing 4, the length of the upper bushing 3 and the lower bushing 4 is reduced compared to the length of the overall injector bushing body in the prior art. This reduces the requirements for the coaxiality, perpendicularity and other geometric tolerances of the injector bushing, and also reduces the risk of interference during the installation of the injector bushing, thereby reducing the difficulty of processing and installing the injector bushing.

[0030] The process of installing the injector bushing of this utility model on the cylinder head 5 is described in detail below:

[0031] Combination Figure 1 , Figure 2 ,as well as Figure 3As shown in the figure, during installation, the sealing ring 6 is first installed on the upper bushing mounting groove 32 and the lower bushing mounting groove 42; then, the threaded part 43 of the lower bushing 4 is screwed into the injector mounting hole on the cylinder head 5 using a tool (not shown in the figure) that engages with the notch 41 of the lower bushing 4, and positioned by the positioning platform 44. At this time, the lower bushing 4 is located in the water cavity 52 of the cylinder head 5.

[0032] After installing the lower bushing 4, the upper bushing 3 is then inserted. The oil hole 31 of the upper bushing 3 is connected to the oil passage 51 of the cylinder head 5, and the lower end face of the upper bushing 3 is in contact with the upper end face of the lower bushing 4. Finally, the pressure block 2 is pressed onto the upper end face of the upper bushing 3, and then the pressure block 2 is fixedly installed on the cylinder head 5 using screws 1. When the upper bushing 3 or the lower bushing 4 is damaged, only the damaged upper bushing 3 or lower bushing 4 needs to be replaced, without replacing the entire injector bushing, thus reducing replacement costs.

[0033] In the description of this specification, it should be understood that the orientation or positional relationship described by terms such as "upper bushing", "lower bushing", "upper bushing mounting groove", "lower bushing mounting groove", "upper end", "lower end", "upper end face", and "lower end face" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fuel injector bushing, characterized in that, include: The injector bushing body is a split structure, comprising an upper bushing and a lower bushing. The lower end of the lower bushing is provided with a threaded portion, and the outer circumferential surface of the threaded portion is provided with threads.

2. The injector bushing according to claim 1, characterized in that, The lower bushing includes a large-diameter section and a small-diameter section connected together, the threaded portion is located in the small-diameter section, and a positioning platform is provided at the lower end of the large-diameter section.

3. The injector bushing according to claim 2, characterized in that, The upper end of the large-diameter section is provided with multiple notches, which are arranged in a ring.

4. The injector bushing according to claim 1, characterized in that, The outer circumferential surface of the upper bushing is provided with an upper bushing mounting groove.

5. The injector bushing according to claim 1, characterized in that, The outer circumferential surface of the lower bushing is provided with a lower bushing mounting groove.

6. The injector bushing according to claim 1, characterized in that, The upper bushing is provided with an oil hole.

7. The injector bushing according to claim 1, characterized in that, The injector bushing also includes a pressure-holding assembly.

8. The injector bushing according to claim 7, characterized in that, The pressing assembly includes a pressing block and a screw, the screw being threaded onto the pressing block.

9. The injector bushing according to claim 4, characterized in that, There are two mounting slots for the upper bushing.

10. The injector bushing according to claim 5, characterized in that, There are two mounting slots for the lower bushing.

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