CN219371904U - Cable fixture for fuel metering unit and fuel metering assembly - Google Patents
Cable fixture for fuel metering unit and fuel metering assembly Download PDFInfo
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- CN219371904U CN219371904U CN202320320424.0U CN202320320424U CN219371904U CN 219371904 U CN219371904 U CN 219371904U CN 202320320424 U CN202320320424 U CN 202320320424U CN 219371904 U CN219371904 U CN 219371904U
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- fuel metering
- cable
- metering unit
- electrical connection
- housing
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Abstract
The utility model relates to a cable fixing device for a fuel metering unit, wherein the cable fixing device at least comprises: a cable receiving portion configured to receive a power supply cable connected to an electrical connection portion of the fuel metering unit; and a fitting portion fixedly connected with the cable receiving portion and configured to be adapted to be fixedly fitted on a housing of the fuel metering unit. And to a corresponding fuel metering assembly. The stress acting on the electrical connection of the fuel metering unit can be reduced as much as possible, whereby the possibility of breakage of the electrical connection is effectively reduced and the service life of the electrical connection of the fuel metering unit is significantly increased.
Description
Technical Field
The utility model relates to a cable fixing device for a fuel metering unit and a corresponding fuel metering assembly.
Background
High-pressure common rail systems are commonly used to supply diesel fuel to diesel engines and have the advantage of high control accuracy. A typical high-pressure common rail system includes a feed pump that delivers low-pressure fuel to a high-pressure pump that compresses the low-pressure fuel into high-pressure fuel and supplies the high-pressure fuel into a common rail, the high-pressure fuel in the common rail being injected into a diesel engine by an injector, thereby completely separating the generation of fuel injection pressure and the injection process. Here, a fuel metering unit, which is an electromechanical integrated component and is configured to control the amount of intake of the high-pressure pump by opening change, is provided between the fuel feed pump and the high-pressure pump, so that precise control of the rail pressure in the common rail is achieved.
The fuel metering unit is also referred to herein as a fuel metering valve and is usually integrated in the high-pressure pump. The valve element of the fuel metering unit can generate different strokes under different supply currents, so that the oil passage area of the fuel metering unit is changed and different opening degrees are realized, and the supply currents are controlled by the electronic control unit based on the acquired rail pressure signals and the injection quantity. For this purpose, the fuel metering unit is electrically connected to the power supply cable via an electrical connection in order to receive a controlled supply current.
However, during operation of the diesel engine, asynchronous vibrations exist between the fuel metering unit and the power supply cable for the fuel metering unit, which cause stresses acting on the electrical connection of the fuel metering unit and result in relative displacements of the parts of the electrical connection, which easily cause breakage of the weak portions of the electrical connection and make the fuel metering unit unable to operate properly.
Disclosure of Invention
The object of the present utility model is therefore to provide an improved cable fastening device for a fuel metering unit, by means of which asynchronous vibrations between the fuel metering unit and a supply cable for the fuel metering unit can be effectively avoided, so that the stresses acting on the electrical connection are reduced as much as possible, whereby the possibility of breakage of the electrical connection is effectively reduced and the service life of the electrical connection of the fuel metering unit is significantly increased, so that the fuel metering unit is ensured to function properly during engine operation.
According to a first aspect of the present utility model there is provided a cable fixture device for a fuel metering unit, wherein the cable fixture device comprises at least:
-a cable receiving portion configured to receive a power supply cable connected to an electrical connection of the fuel metering unit; and
-a fitting part fixedly connected with the cable receiving part and configured to be adapted to be fixedly fitted on a housing of the fuel metering unit.
In the cable fixing device for the fuel metering unit according to the present utility model, the power supply cable is received by the cable receiving portion and is indirectly fixed to the housing of the fuel metering unit by the fitting portion fixedly connected to the cable receiving portion, thereby achieving synchronous vibration of the power supply cable and the fuel metering unit during operation of the diesel engine, which can reduce the vibration phase and amplitude difference between the power supply cable and the fuel metering unit as much as possible, thereby effectively reducing the stress extremum borne by the electrical connection portion disposed between the fuel metering unit and the power supply cable, which can prevent breakage of the weak portion of the electrical connection portion and reliably promote the service life of the electrical connection portion, thereby preventing frequent replacement of the electrical connection portion of the fuel metering unit and ensuring normal operation of the fuel metering unit during operation of the engine.
According to an exemplary embodiment of the utility model, the mounting part is provided with at least one pair of opposing clamping arms by means of which the mounting part can be fastened to the housing in a clamping manner.
According to an exemplary embodiment of the utility model, the mounting portion has a plurality of pairs of clamping arms arranged parallel to each other at a distance from each other; and/or the opposing clamping arms of the fitting together form a circular arc structure, the diameter of which, in the unassembled state, is smaller than the diameter of the housing.
According to an exemplary embodiment of the utility model, the cable fixture is constructed in the form of a one-piece injection molding; alternatively, the cable fixture device is constructed in multiple pieces in combination.
According to an exemplary embodiment of the utility model, an end of the fitting part facing away from the cable receiving part is provided with a lead-in structure which extends outwardly and divergently relative to the clamping arm.
According to an exemplary embodiment of the present utility model, the cable receiving part is provided with a fastening hole for receiving the power supply cable, the fastening hole having a diameter smaller than that of the power supply cable.
According to a second aspect of the present utility model there is provided a fuel metering assembly comprising at least:
-a fuel metering unit;
-an electrical connection having a first end for electrical connection with a tab of the fuel metering unit and a second end opposite the first end;
-an electrical supply cable electrically connected with the second end; and
according to the cable fixing device of the utility model, the cable receiving portion of the cable fixing device receives the power supply cable and the fitting portion of the cable fixing device is fixedly fitted on the housing of the fuel metering unit.
According to an exemplary embodiment of the utility model, the electrical connection comprises a surrounding protective cap, which is detachably fastened to the housing of the fuel metering unit.
According to an exemplary embodiment of the utility model, the housing of the fuel metering unit has a latching projection, the protective cover has a latching recess corresponding to the latching projection, the latching projection being able to protrude through the latching recess; and/or the protective cover has a pressing deformation portion by which the protective cover can be assembled and disassembled with respect to the housing; and/or a damping element is arranged between the housing of the fuel metering unit and the protective cap; and/or a friction element is arranged between the protective cover and the second end.
According to an exemplary embodiment of the utility model, the power supply cable extends from the electrical connection to the cable fixture via a swivel section; and/or the power supply cable has a redundant length between the electrical connection and the cable fixture such that the power supply cable is in a slack state between the electrical connection and the cable fixture.
According to an exemplary embodiment of the present utility model, the housing of the fuel metering unit has a fitting groove corresponding to the fitting portion; and/or the fuel metering assembly is configured for use in a high pressure common rail system.
Drawings
The principles, features and advantages of the present utility model may be better understood by describing the present utility model in more detail with reference to the drawings. The drawings include:
FIG. 1 illustrates a perspective view of a fuel metering assembly according to an exemplary embodiment of the present utility model;
FIG. 2 illustrates a perspective view of a cable fixture device for a fuel metering unit according to an exemplary embodiment of the present utility model;
FIG. 3 illustrates a schematic cross-sectional view of a fuel metering assembly according to an exemplary embodiment of the present utility model;
fig. 4 shows a partial view of fig. 3.
Detailed Description
In order to make the technical problems, technical solutions and advantageous technical effects to be solved by the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
In the drawings, the size of each constituent element, the thickness of layers, or regions are sometimes exaggerated for clarity. Therefore, the shape and size of each component in the drawings do not reflect true proportions.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or an integral connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The meaning of the above terms in the present disclosure can be understood by one of ordinary skill in the art as appropriate.
FIG. 1 illustrates a perspective view of a fuel metering assembly 100 according to an exemplary embodiment of the present utility model. In this case, the fuel metering assembly 100 is configured as a high-pressure common rail system for a diesel engine of a vehicle and is arranged between the fuel feed pump and the high-pressure pump, in particular integrated on the high-pressure pump.
As shown in fig. 1, the fuel metering assembly 100 includes a fuel metering unit 10, which is also referred to as a fuel metering valve, and includes a housing 11, and a spool, a solenoid, and a plunger enclosed by the housing, wherein the solenoid receives a supply current through a plug 12 and generates a magnetic force, and the spool is stroked and pushes the plunger to move by the magnetic force, thereby changing an oil passage area of the fuel metering unit 10 and achieving a desired opening degree to control an amount of fuel delivered to a high-pressure pump and further adjust a rail pressure in a common rail. The electromagnetic coil is here exemplarily arranged in the housing 11.
As shown in fig. 1, the fuel metering assembly 100 comprises an electrical connection 20 which is arranged between the fuel metering unit 10 and the electrical supply cable 30 and is configured for effecting an electrical connection of the fuel metering unit 10 and the electrical supply cable 30, wherein a first end 21 of the electrical connection 20 is electrically connected with the tab 12 of the fuel metering unit 10, and a second end 22 of the electrical connection 20 opposite the first end 21 is electrically connected with the electrical supply cable 30, whereby a current transmission between the electrical supply cable 30 and the electromagnetic coil of the fuel metering unit 10 is effected, see in particular fig. 4. The supply current in the supply line 30 is regulated by the electronic control unit of the high-pressure common rail system in accordance with the recorded rail pressure signal and the injection quantity, so that the opening of the fuel metering unit 10 is precisely controlled in order to correspondingly control the quantity of fuel fed from the high-pressure pump into the common rail and to achieve the desired rail pressure in the common rail. Illustratively, the fuel metering assembly 100 includes two power supply cables 30, one of which is for supplying a power supply voltage and the other for supplying a signal voltage. Accordingly, the fuel metering unit 10 has two tabs 12 for electrical connection to the respective power supply cables.
As shown in fig. 1, the fuel metering assembly 100 includes a cable fixture 40 having a cable receiving portion 41 configured to receive the power supply cable 30 and an assembling portion 42 fixedly connected to the cable receiving portion and configured to be fixedly assembled on the housing 11 of the fuel metering unit 10. The power supply cable 30 can thereby be fastened to the housing 11 of the fuel metering unit 10 by means of the cable fastening device 40. In this case, during running of the vehicle, the power supply cable 30 and the housing 11 of the fuel metering unit 10 are fixed relative to each other such that the induced vibrations remain synchronized between the power supply cable 30 and the housing 11 of the fuel metering unit 10, which can effectively avoid a vibration phase difference between the power supply cable 30 and the housing 11 of the fuel metering unit 10, thereby reducing the amount of vibration displacement of the power supply cable 30 and the housing 11 relative to each other, to reduce the degree of deformation of the electric connection portion 20 disposed between the power supply cable 30 and the fuel metering unit 10 and the stress borne by the electric connection portion 20, thereby avoiding breakage of the electric connection portion 20 during use as much as possible and reliably improving the service life of the electric connection portion 20.
As shown in fig. 1, the power supply cable 30 extends from the electrical connection 20 to the cable holder 40 by way of a swivel section 31, which has a bending angle, in particular, of more than 180 °, so that the direction of extension of the power supply cable 30 at the electrical connection 20 is opposite to the direction of extension of the power supply cable 30 at the cable holder 40, whereby vibrations transmitted from the cable holder 40 to the electrical connection 20 via the power supply cable 30 are reduced. In particular, the power supply cable 30 has a redundant length between the electrical connection 20 and the cable fixing device 40 such that the power supply cable 30 is in a relaxed state between the electrical connection 20 and the cable fixing device 40, whereby vibration damping transmitted to the electrical connection 20 is achieved by the redundant length of the power supply cable 30, thereby further reducing the possibility of breakage of the electrical connection 20 during use.
Fig. 2 shows a perspective view of a cable fixture device 40 for the fuel metering unit 10 according to an exemplary embodiment of the present utility model.
As shown in fig. 2, the cable receiving portion 41 of the cable fixing device 40 is provided with a fastening hole 411 for receiving the power supply cable 30, which receives the power supply cable 30 in a shape-fitting manner. Here, the fastening hole 411 has a diameter that is particularly smaller than the diameter of the power supply cable 30, so that the fastening hole 411 receives the power supply cable 30 in an interference manner and prevents the power supply cable 30 from moving in the cable receiving portion 41. Here, the number of fastening holes 411 corresponds to the number of power supply cables 30.
As shown in fig. 2, the fitting portion 42 of the cable fixing device 40 is provided with at least one pair of opposing clamping arms 421 which are arranged spaced apart from each other and are elastically deformable, thereby forming a clamping region between the pair of clamping arms 421. The mounting portion 42 can be fastened in a clamping manner to the housing 11 of the fuel metering unit 10 by means of a clamping arm 421. However, other fastening means which are considered to be expedient by the person skilled in the art are also conceivable, for example the fitting 42 being fastened to the housing 11 in a form-fitting manner.
Illustratively, as shown in fig. 2, the fitting portion 42 has a plurality of pairs of clamping arms 421 arranged in parallel with each other at a distance from each other, thereby enabling the fitting portion 42 to be clamped more firmly on the housing 11.
As shown in fig. 2, the opposing clamping arms 421 of the mounting portion 42 together form an arc of a circle, the diameter of which is slightly smaller than the diameter of the housing 11 of the fuel metering unit 10 in the unassembled state, as a result of which a reliable clamping of the mounting portion 42 on the housing 11 can be achieved. The arc structure formed by the clamping arm 421 has in particular an arc of more than 180 °, so that a large clamping area of the clamping arm 421 can be achieved.
Illustratively, as shown in fig. 2, the end of the fitting portion 42 facing away from the cable-receiving portion 41 is provided with a lead-in structure 422 formed by an arc or chamfer opposite to the bending direction of the housing 11 and extending outwardly and spreading apart relative to the clamping arm 421. The opening process of the clamping arm 421 can be simplified by the introduction structure 422 and the fitting portion 42 can be easily fitted to the housing 11. In particular, a smooth transition is provided between the clamping arm 421 and the lead-in structure 422.
The cable fixture 40 is illustratively constructed in the form of a one-piece injection molded piece. This can reduce the number of parts, ensure the fixed connection of the cable receiving portion 41 and the fitting portion 42, and simplify the fitting process of the cable fixing device 40. However, it is also conceivable for the cable holder 40 to be constructed in a multi-piece manner, for example for the cable receiving portion 41 to have mutually combined sub-parts, in order to more easily receive the power supply cable 30.
Fig. 3 shows a schematic cross-sectional view of a fuel metering assembly 100 according to an exemplary embodiment of the utility model. Fig. 4 shows a partial view of fig. 3.
As shown in fig. 3 and 4, the first end 21 of the electrical connection 20 is electrically connected to the tab 12 of the fuel metering unit 10, which is connected to the solenoid of the fuel metering unit 10, which is surrounded by the housing 11, and the second end 22 of the electrical connection 20 is electrically connected to the power supply cable 30, whereby the supply current of the power supply cable 30 can be fed into the solenoid of the fuel metering unit 10 through the electrical connection 20 to drive the movement of the spool of the fuel metering unit 10. The power supply cable 30 is fastened to the housing 11 of the fuel metering unit 10 by a cable fastening device 40.
As shown in fig. 4, the electrical connection 20 comprises a surrounding protective cover 23, in which the first end 21 and the second end 22 are arranged in a fixed manner relative to the protective cover, in order to prevent the electrical connection 20 from being influenced by the outside. The protective cap 23 is detachably fastened to the housing 11 of the fuel metering unit 10, thereby ensuring a reliable electrical connection of the electrical connection 20 to the fuel metering unit 10.
As shown in fig. 4, the housing 11 of the fuel metering unit 10 has a latching projection 111, while the protective cap 23 of the electrical connection 20 has a latching recess 231 corresponding to the latching projection 111, wherein the latching projection 111 can protrude through the latching recess 231 in order to achieve a fixed arrangement of the protective cap 23 on the housing 11. However, it is also conceivable for the protective cover 23 and the housing 11 to be fastened to one another in other ways which are considered to be expedient by the person skilled in the art, for example for the housing 11 to have latching notches and the protective cover to have corresponding latching projections.
As shown in fig. 4, the protective cover 23 is configured to be elastically deformable and has a pressing deformation 232, upon which deformation of the protective cover 23 can be achieved, so that the latching projection 111 of the housing 11 can be easily inserted into the latching recess 231 of the protective cover 23 or the latching recess 231 of the protective cover 23 can be released from the latching projection 111 of the housing 11, so that the protective cover 23 can be assembled and disassembled with respect to the housing 11.
As shown in fig. 4, for example, a damping element 24 is arranged between the housing 11 and the protective cap 23 of the fuel metering unit 10, by means of which damping element vibrations transmitted by the housing 11 to the electrical connection 20 can be reduced, so that a relative displacement between the first end 21 and the second end 22 of the electrical connection 20 is reduced.
Illustratively, as shown in fig. 4, a friction element 25 is arranged between the protective cover 23 and the second end 22 of the electrical connection 20, by means of which friction element the pulling force exerted by the electrical supply cable 30 on the electrical connection 20 can be reduced. Here, the tensile force applied to the electrical connection portion 20 can be obtained by the following formula:
F p ＝F v -F f
wherein F is p Is the tensile force applied to the electric connection part 20, F v Is the vibration force applied by the power supply cable 30, F f Is the friction force that exists between the second end 22 and the protective cover 23. Here, based on the tensile force F received by the electric connection portion 20 p And the weak portion of the electrical connection 20 is sized to obtain the maximum stress experienced by the electrical connection 20. Vibration force F v The vibration force F is caused by the relative vibration between the power supply cable 30 and the housing 11 of the fuel metering unit 10 when the power supply cable 30 and the housing 11 of the fuel metering unit 10 are in synchronous vibration v In a relatively small amplitude range, so thatThe maximum stress to which the electrical connection 20 is subjected is significantly smaller than the tensile strength of the electrical connection 20, thereby reliably avoiding breakage of the electrical connection 20 at the weak portion and improving the service life of the electrical connection 20.
Illustratively, a fitting recess corresponding to the fitting 42 is provided in the housing 11 of the fuel metering unit 10, by means of which a secure fastening of the fitting 42 to the housing 11 and a displacement of the cable fixing device 40 in the axial direction of the housing 11 can be achieved.
The following description of the embodiments describes the utility model only in the framework of the examples. Of course, the individual features of the embodiments can be combined with one another freely without departing from the framework of the utility model, as long as they are technically interesting.
Other advantages and alternative embodiments of the utility model will be apparent to those skilled in the art. Therefore, the utility model in its broader aspects is not limited to the specific details, the representative structures, and illustrative examples shown and described. Rather, various modifications and substitutions may be made by those skilled in the art without departing from the basic spirit and scope of the utility model.
Claims (10)
1. A cable fixture (40) for a fuel metering unit (10), the cable fixture (40) comprising at least:
-a cable receiving portion (41) configured to receive a power supply cable (30) connected to an electrical connection portion (20) of the fuel metering unit (10); and
-a fitting portion (42) fixedly connected to the cable receiving portion (41) and configured to be adapted to be fixedly fitted on a housing (11) of the fuel metering unit (10).
2. The cable fixture device (40) according to claim 1, wherein,
the mounting part (42) is provided with at least one pair of opposing clamping arms (421), by means of which the mounting part (42) can be fastened to the housing (11) in a clamping manner.
3. The cable fixture device (40) according to claim 2, wherein,
the fitting portion (42) has a plurality of pairs of clamping arms (421) arranged in parallel spaced apart relation to each other; and/or
The opposing clamping arms (421) of the assembly (42) together form a circular arc, the diameter of which is smaller than the diameter of the housing (11) in the unassembled state.
4. The cable fixture device (40) according to any one of claims 1 to 3, wherein,
the cable fixing device (40) is constructed in the form of an integral injection molding; or alternatively
The cable fixture (40) is constructed in a multi-piece combination.
5. A cable fixture device (40) according to claim 2 or 3, characterized in that,
an end of the fitting part (42) facing away from the cable receiving part (41) is provided with an insertion structure (422) which extends in a flared manner relative to the clamping arm (421).
6. The cable fixture device (40) according to any one of claims 1 to 3, wherein,
the cable receiving portion (41) is provided with a fastening hole (411) for receiving the power supply cable (30), the fastening hole having a diameter smaller than that of the power supply cable (30).
7. A fuel metering assembly (100), the fuel metering assembly comprising at least:
-a fuel metering unit (10);
-an electrical connection (20) having a first end (21) for electrical connection with a tab (12) of the fuel metering unit (10) and a second end (22) opposite to the first end (21);
-an electrical supply cable (30) electrically connected to the second end (22); and
-a cable fixture (40) according to any one of claims 1 to 6, the cable receiving portion (41) of which receives the power supply cable (30) and the fitting portion (42) of which is fixedly fitted on the housing (11) of the fuel metering unit (10).
8. The fuel metering assembly (100) of claim 7 wherein,
the electrical connection (20) comprises a surrounding protective cap (23) which is detachably fastened to the housing (11) of the fuel metering unit (10).
9. The fuel metering assembly (100) of claim 8 wherein,
the housing (11) of the fuel metering unit (10) has a latching projection (111), the protective cap (23) has a latching recess (231) corresponding to the latching projection (111), the latching projection (111) being able to protrude through the latching recess (231); and/or
The protective cover (23) has a pressing deformation (232) by means of which the protective cover (23) can be assembled and disassembled with respect to the housing (11); and/or
A damping element (24) is arranged between the housing (11) and the protective cap (23) of the fuel metering unit (10); and/or
-a friction element (25) is arranged between the protective cover (23) and the second end (22); and/or
The power supply cable (30) extends from the electrical connection (20) to the cable fixture (40) via a swivel section (31); and/or
The power supply cable (30) has a redundant length between the electrical connection (20) and the cable fixture (40) such that the power supply cable (30) is in a relaxed state between the electrical connection (20) and the cable fixture (40).
10. The fuel metering assembly (100) according to any one of claims 7 to 9, wherein,
the housing (11) of the fuel metering unit (10) has an assembly recess corresponding to the assembly portion (42); and/or
The fuel metering assembly (100) is configured for use in a high pressure common rail system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320320424.0U CN219371904U (en) | 2023-02-14 | 2023-02-14 | Cable fixture for fuel metering unit and fuel metering assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320320424.0U CN219371904U (en) | 2023-02-14 | 2023-02-14 | Cable fixture for fuel metering unit and fuel metering assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219371904U true CN219371904U (en) | 2023-07-18 |
Family
ID=87146620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320320424.0U Active CN219371904U (en) | 2023-02-14 | 2023-02-14 | Cable fixture for fuel metering unit and fuel metering assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219371904U (en) |
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2023
- 2023-02-14 CN CN202320320424.0U patent/CN219371904U/en active Active
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