JP2014190272A - Fuel pump module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel pump module capable of easily and quickly electrically connecting an electric fuel pump and a coupler terminal, while simultaneously fitting the electric fuel pump to a first casing.SOLUTION: A bus bar 27 having a pair of contacts 26a and 26b to which a motor terminal 25 of an electric fuel pump 1 is elastically inserted, at one end, and a coupler terminal 28 at the other end, is disposed on a first casing 2, the motor terminal 25 is elastically inserted between the contacts 26a and 26b while fitting and inserting a discharge boss to a fuel supply passage 14, and a set spring 23 for biasing the electric fuel pump 1 to a second casing side and holding the electric fuel pump 1 at a contact position with the second casing, is disposed between the first casing 2 and the electric fuel pump 1.

Description

  The present invention includes a cylindrical electric fuel pump, and first and second casings connected to each other so as to sandwich the electric fuel pump along the axial direction thereof. The present invention relates to an improvement of a fuel pump module in which a fuel supply passage connected to an injection valve is formed and a discharge boss inserted to discharge fuel into the fuel supply passage is provided in an electric fuel pump.

  Such a fuel pump module is already known as disclosed in Patent Document 1 below.

JP 2006-257980 A

  In the conventional fuel pump module, as disclosed in Patent Document 1, the motor lead wire of the electric fuel pump is connected to the coupler terminal, and the connection of the motor lead wire to the coupler terminal is narrow in the first casing. The workability is extremely poor.

  The present invention has been made in view of such circumstances, so that the electric connection between the electric fuel pump and the coupler terminal can be easily and quickly performed simultaneously with the fitting of the electric fuel pump to the first casing. An object of the present invention is to provide the fuel pump module.

  To achieve the above object, the present invention comprises a cylindrical electric fuel pump, and first and second casings connected to each other so as to sandwich the electric fuel pump along its axial direction, In the first casing, a fuel supply passage connected to the fuel injection valve is formed, and in the fuel pump module in which an electric fuel pump is provided with a discharge boss inserted to discharge fuel into the fuel supply passage, A bus bar having a pair of contacts into which motor terminals are elastically inserted at one end and a coupler terminal at the other end is provided in the first casing, and the motor is connected with the discharge boss into the fuel supply passage. The terminals are elastically inserted between the contacts, and the electric fuel pump is urged toward the second casing between the first casing and the electric fuel pump to be electrically operated. The set spring to hold the charge pump at the contact position between the second casing, the first characterized in that interposed to avoid the discharge boss.

  According to the present invention, in addition to the first feature, the discharge boss projecting from the end face of the electric fuel pump is disposed at a position eccentric to one side from the central axis of the electric fuel pump, and The casing is provided with a regulator housing that houses a regulator valve that discharges excess pressure fuel in the fuel supply passage toward the end face of the electric fuel pump, and the regulator housing is disposed on the other side from the central axis. A second feature is that the set spring is disposed at an eccentric position, and the set spring is disposed so as to surround the regulator housing.

  Furthermore, in addition to the first or second feature, the present invention further includes forming a fuel chamber connected to a fuel tank installed outside in the second casing along the side surface of the electric fuel pump. A third feature is that a fuel filter accommodated in the fuel chamber is connected to an inlet of the electric fuel pump. The suction port corresponds to a suction pipe 6 in an embodiment of the present invention described later.

  According to the first aspect of the present invention, the first casing has a bus bar having a pair of contacts into which the motor terminal of the electric fuel pump is elastically inserted at one end and a coupler terminal at the other end. Since the discharge boss is inserted into the fuel supply passage and the motor terminal is elastically inserted between the contacts, the motor terminal is inserted into the first casing simultaneously with the motor terminal. In addition, it is possible to achieve electrical connection between the coupler terminals, and it is not necessary to perform troublesome lead wire connection in the first casing, so that the assembly of the fuel pump module can be improved.

  A set spring for biasing the electric fuel pump toward the second casing and holding the electric fuel pump in a contact position with the second casing is provided between the first casing and the electric fuel pump. Since the electric fuel pump is installed so as to avoid it, the electric fuel pump can be held in the first and second casings without play, and therefore, the vibration of the electric fuel pump can be suppressed and wear of the motor terminal and the contact can be prevented. . The set spring can be arranged in a dead space that is not obstructed by the discharge boss, and can contribute to the compactness of the fuel pump module.

  According to the second feature of the present invention, the discharge boss protruding from the end face of the electric fuel pump is disposed at a position eccentric to one side from the central axis of the electric fuel pump, Has a regulator housing for accommodating a regulator valve that discharges excess pressure fuel in the fuel supply passage toward the end face of the electric fuel pump, and the regulator housing is eccentric from the central axis to the other side. Since the set spring is arranged at a position so that it surrounds the regulator housing, the discharge boss, the regulator housing and the set spring should be installed by effectively utilizing the narrow space on the end face of the electric fuel pump. This can contribute to downsizing of the fuel pump module.

  According to the third aspect of the present invention, a fuel chamber connected to a fuel tank installed outside is formed in the second casing along the side surface of the electric fuel pump and accommodated in the fuel chamber. Since the fuel filter is connected to the suction port of the electric fuel pump, an increase in the axial dimension of the electric fuel pump due to the installation of the fuel filter can be suppressed, and the fuel pump module M can be made compact. In particular, due to the combined action of the first, second and third features, a fuel pump module installed outside the fuel tank can be provided with high layout and compactness. Moreover, since the fuel filter connected to the suction pipe is a low pressure type, it can be obtained at a relatively low cost.

The longitudinal section side view of the fuel pump module concerning the example of the present invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In FIG. 1, the fuel pump module M is for a motorcycle, and is attached to an appropriate position of the engine or the vehicle body of the motorcycle. The fuel pump module M includes a cylindrical electric fuel pump 1 and first and second casings 2 and 3 that accommodate and hold the electric fuel pump 1 in cooperation. The first and second casings 2 and 3 each have a bottomed cylindrical shape, and the open end of the first casing 2 is fitted to the inner peripheral surface of the second casing 3 via an O-ring 4. The casings 2 and 3 are detachably connected by the snap connection means 5 at the fitting portion.

  A suction pipe 6 bent toward one side is formed on one end face of the electric fuel pump 1, and a fuel filter 7 is connected to the inlet of the suction pipe 6.

  As shown in FIGS. 1 and 3, a stepped discharge boss 10 is formed on the other end surface of the electric fuel pump 1 so as to protrude in parallel with the central axis Y. An eccentricity e1 (see FIG. 3) is arranged on one side from the central axis Y.

  As shown in FIGS. 1 and 4, a fuel introduction pipe 12 for introducing fuel from an external fuel tank T protrudes from one side of the second casing 3, and a fuel chamber 13 connected to the fuel introduction pipe 12 is provided. Formed in the first casing 2, the fuel filter 7 is accommodated in the fuel chamber 13. The fuel chamber 13 includes a disc-like chamber 13a that accommodates the fuel introduction pipe 12, and a crescent shape that accommodates the fuel filter 7 by bending along the side surface of the second casing from one end of the disc-like chamber 13a. The fuel filter 7 is formed to extend in an arc along the side surface of the electric fuel pump 1 so as to follow the crescent-shaped chamber 13b.

  A fuel supply pipe 14 for supplying fuel to the fuel injection valve I of the engine protrudes from one side of the first casing 2, and a fuel supply passage 15 connected to the inside of the fuel supply pipe 14 is provided in the first casing 2. Provided. The fuel supply passage 15 has a stepped vertical hole 15a disposed in parallel to the central axis Y of the electric fuel pump 1 corresponding to the discharge boss 10, and is bent from the vertical hole 15a to be inside the fuel supply pipe 14. The discharge boss 10 is inserted through the O-ring 11 into the vertical hole 15a. The horizontal hole 15b has a smaller diameter than the vertical hole 15a.

  The first casing 2 is formed with a regulator housing 20 that protrudes toward the end face of the electric fuel pump 1 so as to be opposed to the discharge boss 10, and surplus pressure fuel in the fuel supply passage 15 is formed in the regulator housing 20. A known regulator valve 21 for discharging the fuel into the first casing 2 is housed, and a fuel return pipe 22 for returning the excess pressure fuel discharged into the first casing 2 to the fuel tank T is provided in the first casing 2. Projected on the side.

  Between the first casing 2 and the electric fuel pump 1, a set spring 23 made of a coil spring that elastically biases the electric fuel pump 1 toward the second casing 3 is provided in a contracted manner. , Arranged so as to surround the regulator housing 20. Thus, the regulator housing 20 and the set spring 23 are decentered e2 (see FIG. 3) in the direction opposite to the discharge boss 10 with respect to the central axis Y of the electric fuel pump 1 at the end face of the electric fuel pump 1. Placed in.

  In FIG. 2, the pair of strip-like motor terminals 25, 25 of the electric fuel pump 1 protrude from the end face of the electric fuel pump 1 so as to sandwich the lateral hole 15 b of the fuel supply passage 15, and these motor terminals 25, 25 A pair of bus bars 27, 27 having one pair of two contacts 26a, 26b; 26a, 26b at one end thereof are held by the first casing 2, and the holding structure thereof will be described later.

  Each bus bar 27 is provided with a pair of first and second flat plate portions 27a and 27b that are integrally connected via a connecting piece 27c so that the plate surfaces are opposed to each other, and the first and second flat plate portions 27a and 27b The tip portions constitute a pair of contacts 26a and 26b that elastically bring the curved surfaces close to each other. Thus, these two pairs of contacts 26a, 26b; 26a, 26b are arranged so as to be in pressure contact with the plate surfaces of the pair of motor terminals 25, 25.

  In addition, a coupler terminal 28 that is bent outward and protrudes integrally at the end of the inner flat plate portion 27a near the discharge boss 10 out of the first and second flat plate portions 27a and 27b. The base 28 is embedded and held in the first casing 2 so as to face the coupler 29 formed integrally with the end of the first casing 2, whereby the bus bars 27 and 27 are held in the first casing 2. Will be.

  Next, the operation of this embodiment will be described.

  The fuel flowing down from the fuel tank T is always stored in the fuel chamber 13 of the second casing 3. When the electric fuel pump 1 is operated, the fuel in the fuel chamber 13 is sucked into the suction pipe 6 through the fuel filter 7, boosted in the electric fuel pump 1, discharged from the discharge boss 10 to the fuel supply passage 15, and engine fuel. Supplied to the injection valve I. At this time, when the fuel pressure in the fuel supply passage 15 exceeds a specified value, the regulator valve 21 opens to discharge excess pressure fuel into the first casing 2, and the fuel passes through the fuel return pipe 22 to the fuel tank T. Returned to

  In assembling the fuel pump module M, first, after setting the set spring 23 around the regulator housing 20, the electric fuel pump 1 is fitted into the first casing 2 and the discharge boss 10 of the electric fuel pump 1 is attached. It is inserted into the vertical hole 15a of the first casing 2 via the O-ring 11, and at the same time, the pair of motor terminals 25, 25 of the electric fuel pump 1 are paired in two pairs on the first casing 2 side. Since the contacts 26a and 26b; 26a and 26b are elastically inserted, the motor terminals 25 and 25 and the coupler terminals 28 and 28 are in an electrically connected state.

  By the way, the discharge boss 10 is arranged on the end face of the electric fuel pump 1 with an eccentricity e1 with respect to the central axis Y of the electric fuel pump 1, and this is fitted into the vertical hole 15a of the first casing 2. Thus, the insertion position of the electric fuel pump 1 into the first casing 2 is uniquely determined, and the motor terminals 25, 25 are connected to the contacts 26a, 26b; Since the insertion position is automatically determined, the insertion of the discharge boss 10 into the vertical hole 15a and the insertion of the motor terminals 25, 25 between the contacts 26a, 26b; 26a, 26b can be combined. The electric fuel pump 1 can be easily assembled to the first casing 2.

  Next, after attaching the fuel filter 7 to the suction pipe 6 of the electric fuel pump 1, the second casing 3 is fitted to the outer periphery of the end portion of the first casing 2 and connected to the first casing 2 by the snap connection means 5. . At that time, since the first casing 2 presses the suction pipe 6 toward the first casing 2 by its bottom, the electric fuel pump 1 is pushed deeper into the first casing 2 and compresses the set spring 23. As a result, due to the repulsive force of the set spring 23, the electric fuel pump 1 is held at the contact position with the second casing 3 without backlash. Therefore, vibration of the electric fuel pump 1 can be suppressed and wear of the motor terminal 25 and the contacts 26a and 26b can be prevented.

  In addition, the set spring 23 is arranged on the outer periphery of the regulator housing 20 and the set spring 23 and the discharge boss 10 are arranged eccentrically in different directions with respect to the central axis Y of the electric fuel pump 1. The discharge boss 10, the regulator housing 20 and the set spring 23 can be installed by effectively utilizing the narrow space on the end face of the electric fuel pump 1 that is not obstructed by the electric fuel pump 1, thereby further reducing the fuel pump module M in size. Can contribute.

  In the second casing 3, a fuel chamber 13 connected to an external fuel tank T is formed along the side surface of the electric fuel pump 1, and a fuel filter 7 accommodated in the fuel chamber 13 is provided with the electric fuel pump 1. Therefore, the increase in the axial dimension of the electric fuel pump 1 due to the installation of the fuel filter 7 can be suppressed, and the increase in the radial dimension of a part of the electric fuel pump 1 can be reduced. The fuel pump module M can be further downsized. As a result, as the fuel pump module M installed outside the fuel tank T, it is possible to provide a compact one having a high layout property. Moreover, since the fuel filter connected to the suction pipe is a low pressure type, it can be obtained at a relatively low cost.

  Moreover, since the fuel filter 7 connected to the suction pipe 6 may be a low pressure type, it can be obtained at a relatively low cost.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. The fuel pump module M can also be disposed in the fuel tank T.

M ... Fuel pump module I ... Fuel injection valve T ... Fuel tank Y ... Center axis of electric fuel pump 1 ... Electric fuel pump 2 ... ... First casing 3 ... Second casing 6 ... Suction port (suction pipe)
7 ... Fuel filter 10 ... Discharge boss 13 ... Fuel chamber 14 ... Fuel supply passage 20 ... Regulator housing 21 ... Regulator valve 23 ... Set Spring 25 ... Motor terminals 26a, 26b Contact 27 ... Bus bar 28 ... Coupler terminal

Claims (3)

A cylindrical electric fuel pump (1), and first and second casings (2, 3) connected to each other so as to sandwich the electric fuel pump (1) along its axial direction, In the first casing (2), a fuel supply passage (14) connected to the fuel injection valve (I) is formed, and a discharge boss (10) inserted into the fuel supply passage (14) to discharge fuel is electrically driven. In the fuel pump module provided in the fuel pump (1),
The bus bar (27) having a pair of contacts (26a, 26b) into which the motor terminal (25) of the electric fuel pump (1) is elastically inserted at one end and a coupler terminal (28) at the other end. One casing (2) is provided, and the discharge boss (10) is fitted into the fuel supply passage (14), and the motor terminal (25) is elastically inserted between the contacts (26a, 26b). The electric fuel pump (1) is urged toward the second casing (3) between the first casing (2) and the electric fuel pump (1) so that the electric fuel pump (1) is 2. A fuel pump module comprising a set spring (23) that is held in contact with the casing (3) so as to avoid the discharge boss (10). The fuel pump module according to claim 1,
The discharge boss (10) protruding from the end face of the electric fuel pump (1) is disposed at a position eccentric (e1) to one side from the central axis (Y) of the electric fuel pump (1), In the first casing (2), a regulator housing (20) that houses a regulator valve (21) that discharges excess pressure fuel in the fuel supply passage (14) protrudes toward the end face of the electric fuel pump (1). The regulator housing (20) is disposed at a position eccentric (e2) from the central axis (Y) to the other side, and the set spring (23) surrounds the regulator housing (20). A fuel pump module, wherein the fuel pump module is arranged as described above. The fuel pump module according to claim 1 or 2,
A fuel chamber (13) connected to an external fuel tank (T) is formed in the second casing (3) along the side surface of the electric fuel pump (1). A fuel pump module characterized in that a fuel filter (7) accommodated in the electric fuel pump (1) is connected to an intake port (6).

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