CN218082541U

CN218082541U - Pre-assembly device

Info

Publication number: CN218082541U
Application number: CN202222560468.9U
Authority: CN
Inventors: 高安泽
Original assignee: BMW Brilliance Automotive Ltd
Current assignee: BMW Brilliance Automotive Ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2022-12-20
Anticipated expiration: 2032-09-27

Abstract

The utility model relates to a pre-assembly device, pre-assembly device is used for accepting and pre-tightening spark plug, a serial communication port, pre-assembly device includes: a sleeve mechanism configured to receive and pre-tighten a spark plug, the sleeve mechanism having a first section in which a hollow receptacle is configured to receive the spark plug and a second section adjoining the first section; and a hollow guide mechanism configured to guide the sleeve mechanism and having a guide portion on an inner wall for guiding the sleeve mechanism; wherein the first section of the sleeve mechanism is accommodated within the guide mechanism and is capable of sliding movement on the guide portion of the guide mechanism, and the second section of the sleeve mechanism protrudes from the guide mechanism through a hole at one end of the guide mechanism. Thereby, the spark plug can be made to project into the cylinder head hole with being guided, and the pre-tightening of the spark plug can be performed stably.

Description

Pre-assembly device

Technical Field

The utility model relates to a preassembly device for accepting and screwing up spark plug in advance.

Background

In vehicle manufacturing, a cylinder head is assembled in a powertrain factory, and a spark plug is installed and pre-tightened on a cylinder head production line. According to the technological requirements, the electrodes cannot be touched when the spark plug is removed and installed, so the spark plug is installed and pre-tightened with a special tool. The special tool adopted at present is an import standard part which is made of nylon and does not have an inner hexagonal structure. This leads to the following disadvantages: since the spark plug is inserted into the cylinder head hole without guidance and is pre-tightened, collision of the spark plug with the cylinder head may occur during insertion, resulting in damage to the spark plug; the special tool in the prior art is made of nylon materials and is an imported part, so that the daily consumption cost is high; overseas ordering results in long purchase cycles; the nylon material of the special tool in the prior art is easy to wear under the condition of long-time use, which results in short service life; the special tool in the prior art has no inner hexagonal structure, so that the pre-tightening performance is poor.

SUMMERY OF THE UTILITY MODEL

It is therefore an object of the present invention to provide a pre-assembly device, by means of which a spark plug can be advantageously introduced into a mounting hole in a guided manner and pre-tightened in the mounting hole.

Said object is achieved by a preassembly device. The pre-assembly device is used for receiving and pre-tightening a spark plug. The preassembly device comprises: a sleeve mechanism configured to receive and pre-tighten a spark plug, the sleeve mechanism having a first section in which a hollow receptacle for receiving the spark plug is configured and a second section adjoining the first section; and a hollow guide mechanism configured to guide the sleeve mechanism and having a guide portion on an inner wall for guiding the sleeve mechanism; wherein the first section of the sleeve mechanism is accommodated within the guide mechanism and is capable of sliding movement on the guide of the guide mechanism, and the second section of the sleeve mechanism protrudes out of the guide mechanism through a hole at one end of the guide mechanism.

In the pre-assembling apparatus according to the present invention, by making the sleeve mechanism perform the pre-tightening of the spark plug under the condition of being guided in the guide mechanism, it is possible to make the spark plug project into the cylinder head hole under the condition of being guided, and the pre-tightening of the spark plug can be stably performed.

In some embodiments, the length of the first section may be less than the length of the guide.

In some embodiments, the receiving portion may have an internal hexagonal structure in the region of the free end of the first section for receiving a hexagonal nut of a spark plug. In this way, the spark plug can be screwed in better by providing an internal hexagonal structure in the receptacle.

In some embodiments, a plurality of protrusions may be provided on the internal hex configuration, the protrusions being configured to at least partially interfere with a hex nut on the spark plug when the spark plug is received by the sleeve mechanism to retain the spark plug in the receiver. By providing the projection which is interference-fitted with the hexagonal nut on the plug, the plug can be reliably held in the receiving portion without falling off after being received.

In some embodiments, the protrusions may be configured as dot-shaped structures or stripe-shaped structures extending in the longitudinal direction of the first section.

In some embodiments, in the initial position in which the sleeve means is not operated, the distance between the bottom face of the internal hexagonal structure and the end face of the guide means can be selected such that, when the guide means is pressed against the bottom face of the cylinder head bore, the external thread of the spark plug received in the receiving portion of the first section does not contact the internal thread of the threaded bore of the cylinder head. Thus, in the initial position in which the sleeve mechanism is not operated, the external thread of the spark plug does not hit the internal thread of the threaded hole of the cylinder head, thereby avoiding the external thread of the spark plug colliding with the internal thread of the threaded hole of the cylinder head when the guide mechanism abuts against the bottom surface of the cylinder head hole, and avoiding the external thread of the spark plug or the internal thread of the threaded hole of the cylinder head from being damaged.

In some embodiments, a T-shaped handle may be provided on the end of the second section facing away from the first section. By arranging the T-shaped handle, the operation, particularly the rotating operation of the sleeve mechanism can be more labor-saving.

In some embodiments, an intermediate sleeve can be fixedly arranged on the end of the guide means provided with the bore for the second section, wherein the rolling bearing for mounting the second section is arranged in the intermediate sleeve. Through setting up antifriction bearing, can support sleeve mechanism, reduce the friction among the rotational motion process to guarantee sleeve mechanism's high gyration precision.

In some embodiments, the rolling bearing can be arranged fixedly in the intermediate sleeve via a bearing positioning sleeve.

In some embodiments, a spring element can be attached to the second section of the sleeve mechanism, which spring element is supported with one end on an end face of the bearing retainer sleeve and with the other end on a stop mechanism, which is arranged at a distance from the intermediate sleeve at the second section of the sleeve mechanism, in the pretensioned state. By providing a spring element, it is possible to keep the sleeve mechanism in its initial position when not operated and to automatically spring back into the initial position after the completion of the pre-tightening operation.

In some embodiments, the stop mechanism may comprise a clamping piece which is arranged fixedly in a recess in an end region of the second section of the stop mechanism, and a washer which is arranged between the clamping piece and the spring element.

In some embodiments, the guide means may have a flat annular end face at its free end, so that the flat annular end face of the guide means can lie flat against the bottom face of the cylinder head bore when the spark plug is pre-tightened. By providing a flat annular end face, when the guide means abuts against the bottom surface of the cylinder head hole, the end face of the guide means does not damage the bottom surface of the cylinder head hole due to planar abutment.

In some embodiments, the sleeve means and/or the guide means may be comprised of metal. By making the sleeve means and/or said guide means of metal, the service life of the sleeve means and/or said guide means can be significantly increased compared to prior art nylon materials.

Drawings

The invention is further explained below with the aid of exemplary embodiments with reference to the schematic drawings. Wherein:

fig. 1 is a schematic perspective view of a preassembly device according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of the preassembly device according to fig. 1.

Detailed Description

Fig. 1 is a schematic perspective view of a preassembly device according to an exemplary embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of the preassembly device according to fig. 1. The preassembly device according to the invention is described in detail below with reference to fig. 1 and 2.

As is clearly visible in fig. 1 and 2, the preassembly device for receiving and pre-tightening a spark plug according to the invention comprises a sleeve device 2 and a hollow guide device 9. The sleeve mechanism 2 is configured for receiving and pre-tightening a spark plug. The sleeve mechanism 2 has a first section 21 and a second section 22 adjoining the first section 21, wherein a hollow receptacle 23 for receiving a spark plug is formed in the first section 21. The guide means 9 is configured for guiding the sleeve means 2 and has a guide portion on the inner wall for guiding the sleeve means 2. The first section 21 of the sleeve mechanism 2 is accommodated in the guide mechanism 9 and can perform a sliding movement on a guide of the guide mechanism 9. The second section 22 of the sleeve means 2 protrudes from the guide means 9 through a hole at one end of the guide means 9. The second section 22 is configured, for example, as a shank. In the region of the free end of the first portion 21, the receptacle 23 has an internal hexagon 24 for receiving a hexagon nut of a spark plug, as a result of which the spark plug with the hexagon nut can be advantageously screwed. A plurality of protrusions configured as strip-shaped structures are provided on the internal hexagonal structure 24. The projection extends here in the longitudinal direction of the first section 21. The projection is capable of at least partially interference fitting with a hexagonal nut on the spark plug when the spark plug is received by the socket mechanism 2 to retain the spark plug in the receiving portion 23. In some embodiments, the projections can also be embodied as punctiform projections.

As is clearly visible in fig. 2, the length of the first section 21 is smaller than the length of the guide. Furthermore, in an initial position in which the sleeve mechanism 2 is not operated, as in the position shown in fig. 2, the distance between the bottom face of the internal hexagonal structure 24 and the end face of the guide mechanism 9 is selected such that, when the guide mechanism 9 is pressed against the bottom face of the cylinder head bore, the external thread of the spark plug received in the receiving portion 23 of the first section 21 does not come into contact with the internal thread of the threaded bore of the cylinder head. In this way, it is possible to prevent the external thread of the spark plug from colliding with the internal thread of the threaded bore of the cylinder head in the initial position of the sleeve mechanism 2 when the guide mechanism 9 is abutted against the bottom surface of the cylinder head bore. The external and internal threads are engaged only during subsequent operations.

As is clearly shown in fig. 1, a T-shaped handle 1 is provided on the end of the second section 22 facing away from the first section 21. In the embodiment shown in fig. 1, the T-shaped handle 1 is of T-shaped construction, i.e. with a grip extending on both sides. The handle 1, which is T-shaped, can produce a lever effect, so that the screwing operation for the spark plug can be made more labor-saving.

As shown in fig. 1 and 2, an intermediate sleeve 8 is fixedly arranged on the end of the guide 9 provided with the bore for the second section 22. As is clearly visible in fig. 2, the rolling bearing 7 for mounting the second portion 22 is arranged in the intermediate sleeve 8, wherein the rolling bearing 7 is arranged fixedly in the intermediate sleeve 8 via the bearing spacer 6. Thereby, the sleeve mechanism 2 can be supported by the rolling bearing 7 to reduce friction during the rotational movement, thereby further saving labor for the screwing operation to the spark plug. Meanwhile, the high rotation accuracy of the sleeve mechanism 2 can also be ensured by providing the rolling bearing 7.

In order to keep the sleeve means 2 in its initial position when not operated and to automatically spring back into the initial position after completion of the pre-tightening operation, a spring element 5 is fitted over the second section 22 of the sleeve means 2. In the prestressed state, the spring element 5 is supported with one end on an end face of the bearing bushing 6 and with the other end on a stop mechanism which is arranged at a distance from the intermediate sleeve 8 on the second section 22 of the sleeve mechanism 2. The stop mechanism comprises a clip 3 and a washer 4. The clamping part 3 is arranged fixedly in a recess in the end region of the second section 22 of the stop mechanism. The washer 4 is arranged between the grip 3 and the spring element 5. In the present exemplary embodiment, the clamping part 3 is designed as a clamping spring. A circlip is fixed in a recess of the second section 22 of the sleeve mechanism 2, which is designed as a shaft, the lower surface of the circlip being in contact with the washer 4, which is likewise mounted on the sleeve mechanism 2, wherein the spring element 5 is in contact with the bearing bushing 6 at one end and with the washer 4 at the other end. In some embodiments, the clasp 3 and the washer 4 may also be configured as other conceivable mechanical elements.

As is clearly visible in fig. 2, the guide means 9 has a flat annular end face at its free end, so that the flat annular end face of the guide means 9 can lie flat against the bottom face of the cylinder head bore when the spark plug is screwed on. Thus, when the guide 9 abuts against the bottom surface of the cylinder head hole, the annular end surface of the guide 9 does not damage the bottom surface of the cylinder head hole due to the planar abutment. A chamfer may be provided at the annular end face.

In order to ensure a long service life and wear resistance of the sleeve means 2 and/or the guide means 9, the sleeve means 2 and/or the guide means 9 are made of metal. The sleeve means 2 and/or the guide means 9 may for example be made of steel or an aluminium alloy.

The following is an exemplary explanation of the operator's operational procedure using the pre-assembled device. The operator receives the spark plug via the receptacle 23 at the first section 21 of the sleeve arrangement 2 of the preassembly device and removes the spark plug from the material package. The operator then manually positions the pre-assembly device over the location of the engine to be installed. The operator then presses the preassembly downward, with the annular end face of the guide 9 first contacting the bottom face of the cylinder head bore. Then, as the pressure is continuously applied, the spark plug is guided and drawn by the guide mechanism 9. Finally, when the spark plug comes into contact with the bolt hole in the mounted position, the operator rotates the handle 1 on the second section 22 of the sleeve mechanism 2 for pre-tightening.

It is noted that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be understood that the terms "comprises" and "comprising," and other similar terms, when used in this specification, specify the presence of stated operations, elements, and/or components, but do not preclude the presence or addition of one or more other operations, elements, components, and/or groups thereof. The term "and/or" as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, like reference numerals refer to like elements throughout.

The thickness of elements in the figures may be exaggerated for clarity. It will be further understood that if an element is referred to as being "on," "coupled to" or "connected to" another element, it can be directly on, coupled or connected to the other element or intervening elements may be present. Conversely, if the expressions "directly on … …", "directly coupled with … …" and "directly connected with … …" are used herein, then there are no intervening elements present. Other words used to describe the relationship between elements should be similarly interpreted, such as "between … …" and "directly between … …", "attached" and "directly attached", "adjacent" and "directly adjacent", and so forth.

Terms such as "top," "bottom," "above," "below," "over," "under," and the like, may be used herein to describe one element, layer or region's relationship to another element, layer or region as illustrated in the figures. It will be understood that these terms are intended to encompass other orientations of the device in addition to the orientation depicted in the figures.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a first element could be termed a second element without departing from the teachings of the present inventive concept.

It is also contemplated that all of the exemplary embodiments disclosed herein may be combined with each other as desired.

Finally, it is pointed out that the above-described embodiments are only intended to be understood and do not limit the scope of protection of the invention. It will be apparent to those skilled in the art that modifications may be made in the foregoing embodiments without departing from the scope of the invention.

Claims

1. A pre-assembly apparatus for receiving and pre-tightening a spark plug, the pre-assembly apparatus comprising:

a sleeve arrangement (2) which is designed to receive and pre-tighten the spark plug, said sleeve arrangement having a first section (21) in which a hollow receptacle (23) for receiving the spark plug is formed, and a second section (22) adjoining the first section; and

a hollow guide mechanism (9) which is configured to guide the sleeve mechanism and has a guide portion on an inner wall for guiding the sleeve mechanism;

wherein the first section of the sleeve mechanism is accommodated within the guide mechanism and is capable of sliding movement on the guide of the guide mechanism, and the second section of the sleeve mechanism protrudes out of the guide mechanism through a hole at one end of the guide mechanism.

2. A preassembly device according to claim 1, wherein the length of the first section is less than the length of the guide.

3. A preassembly device according to claim 1, characterized in that the receiving part has an internal hexagonal structure (24) for receiving a hexagonal nut of a spark plug in the region of the free end of the first section.

4. A preassembly according to claim 3, wherein a plurality of projections are provided on the internal hexagonal structure, the projections being capable of at least partially interference fitting with a hexagonal nut on the spark plug when the spark plug is received by the sleeve mechanism to retain the spark plug in the receiver.

5. A preassembly device according to claim 4, wherein the projections are configured as dot-like structures or as strip-like structures extending in the longitudinal direction of the first section.

6. A preassembly according to claim 3, characterized in that in an initial position in which the sleeve means is not operated, the spacing of the bottom face of the internal hexagonal structure from the end face of the guide means is selected such that the external thread of the spark plug received in the receiving portion of the first section does not contact the internal thread of the threaded bore of the cylinder head when the guide means is brought into abutment against the bottom face of the cylinder head bore.

7. A preassembly device according to any one of claims 1 to 6, characterized in that a T-shaped handle (1) is provided on the end of the second section facing away from the first section.

8. The preassembly device according to any one of claims 1 to 6, characterized in that an intermediate sleeve (8) is fixedly arranged on the end of the guide means provided with the bore for the second section, wherein a rolling bearing (7) for bearing the second section is arranged in the intermediate sleeve.

9. A preassembly device according to claim 8, characterized in that the rolling bearing is fixedly arranged in an intermediate sleeve via a bearing positioning sleeve (6).

10. A preassembly device according to claim 9, characterized in that a spring element (5) is fitted on the second section of the sleeve mechanism, said spring element being supported in the pretensioned state with one end on an end face of the bearing positioning sleeve and with the other end on a stop mechanism arranged on the second section of the sleeve mechanism at a distance from the intermediate sleeve.

11. A preassembly device according to claim 10, characterized in that the catch mechanism comprises a clamping member (3) fixedly arranged in a recess in an end region of the second section of the catch mechanism and a washer (4) arranged between the clamping member and the spring element.

12. A preassembly device according to any one of claims 1 to 6, wherein the guide means has a flat annular end face at its free end, so that the flat annular end face of the guide means can be placed flat against the bottom face of the cylinder head bore when the spark plug is being pretensioned.