CN114635820A

CN114635820A - Starter

Info

Publication number: CN114635820A
Application number: CN202111465361.XA
Authority: CN
Inventors: 稻谷展也; 松村贵裕; 龟井光一郎
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2020-12-16
Filing date: 2021-12-03
Publication date: 2022-06-17
Also published as: JP2022095018A; JP7030945B1

Abstract

A starter, comprising: an electric motor as a driving force for performing engine start; a front carrier housing a planetary reduction mechanism and a drive shaft; and a pinion gear connected to a rotation shaft of an engine at a distal end of the drive shaft, wherein the front carrier is composed of a first front carrier attached to the engine and a second front carrier accommodating the planetary reduction mechanism therein, a drain groove extending in an axial direction of the drive shaft is formed in the front carrier, and a drain port is provided in the first front carrier in an axial direction from the drain groove toward the pinion gear side to prevent water from entering from the drain hole.

Description

Starter

Technical Field

The present application relates to a starter that starts an engine.

Background

In general, in a dc motor such as an engine starter, water sometimes enters the starter. Patent document 1 shows a starter including, as means for discharging water that has entered the inside of the starter, discharge ports at an intermediate plate and an internal gear that are components inside the starter to ensure a discharge path of water from the inside of the motor to the inside of a gear housing (front bracket).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-66953

Disclosure of Invention

In the starter of patent document 1, a drain hole is provided in the bottom of the bracket. However, in a starter mounted on a vehicle, water may be drawn from below a vehicle body and a large amount of water may enter from a drain hole. In order to prevent water from entering the water drain hole, a water-entry prevention member for preventing water from entering the starter is provided around the water drain hole.

In addition, in order to improve the water resistance against the water wetting from below, effective means are: however, when the mounting angle of the engine mounting head is changed, it is necessary to newly provide a groove or a hole for discharge in the front bracket, and therefore, there is a problem that the entire mold of the front bracket must be newly manufactured.

The present invention has been made to solve the above-described problems occurring in the conventional drain structure, and an object of the present invention is to provide an engine starting starter that can improve water resistance without requiring a water-entry prevention member against water from below the vehicle body, and can realize sharing of components with a simple structure even when the attachment angle to the engine is changed.

The starter of the present application includes: an electric motor as a driving force for performing engine start; a front carrier housing a planetary reduction mechanism and a drive shaft; and a pinion gear connected to a rotation shaft of an engine at a distal end of the drive shaft, wherein the front carrier is composed of a first front carrier attached to the engine and a second front carrier accommodating the planetary reduction mechanism therein, a drain groove extending in an axial direction of the drive shaft is formed in the front carrier, and a drain port is provided in the first front carrier in an axial direction from the drain groove toward the pinion gear.

According to the present invention, since the drain hole is not provided in the radial direction of the bracket member of the starter, high waterproofness against water wetting from below the vehicle body can be ensured. Further, even in the case where the mounting angle to the engine is changed, by dividing the front bracket into the first front bracket that needs to be changed correspondingly and the second front bracket that is not affected by the change, the second front bracket that is a component that is not affected by the change can be shared.

Drawings

Fig. 1 is a sectional view showing a starter according to embodiment 1.

Fig. 2 is a front view showing a first front bracket according to embodiment 1.

Fig. 3 is a rear view showing a first front bracket according to embodiment 1.

Fig. 4 is a front view showing a second front bracket according to embodiment 1.

Fig. 5 is a rear view showing a second front holder according to embodiment 1.

Fig. 6 is a front view showing an intermediate plate according to embodiment 1.

Fig. 7 is a rear view showing an intermediate plate incorporated in a second front bracket according to embodiment 1.

(symbol description)

1a first front bracket; 1a first drainage channel; 1b a water discharge port; 1c, socket piece; 1d engine mounting holes; 1e a positioning part; 2a second front support; 2a drain hole; 2b a positioning part; 3 an overdrive clutch; 3a pinion moving body; 4 a planetary reduction mechanism; 5a middle plate; 5a an opening part; 5b an engaging part; 6 a yoke part; 7 an electric motor; 7a rotating shaft; 8, a rear bracket; 9 a pinion gear; 10 driving a shaft; 11 an electromagnetic switch; 12 rods; 13 bearing; 15 a front support; 16 drainage grooves; 100 starter.

Detailed Description

Embodiment mode 1

Fig. 1 is a sectional view showing a starter according to embodiment 1. In fig. 1, the starter 100 includes a first front bracket 1 and a second front bracket 2 that constitute a front bracket 15 in combination. Further, a yoke 6 is provided at a rear end portion of the second front bracket 2, and a motor 7 is provided inside the yoke 6. Further, a rear bracket 8 is provided at a rear end portion of the yoke 6. For convenience of explanation, in the following drawings, a diagram viewed from the right side of the starter 100 of fig. 1 is described as a front view, and a diagram viewed from the left side is described as a rear view.

An overdrive clutch 3 is housed in the first front bracket 1. A drive shaft 10 is provided in the overrunning clutch 3, and the driving force of the electric motor 7 is transmitted to the pinion gear 9 via the planetary reduction mechanism 4, the overrunning clutch 3, and the drive shaft 10. A pinion gear 9 is formed at an end portion of the pinion moving body 3a integrated with the inside of the clutch of the overrunning clutch 3, and the pinion gear 9 is capable of reciprocating in the axial direction of the drive shaft 10 together with the pinion moving body 3 a. The pinion gear 9 is connected to a rotating shaft of the engine via a ring gear (not shown). The drive shaft 10, the overrunning clutch 3, and the pinion gear 9 are disposed coaxially with the rotation shaft 7a of the motor 7.

Further, an electromagnetic switch 11 is provided in the first front bracket 1. The electromagnetic switch 11 is engaged with a lever 12 rotatably housed in the first front bracket 1, and moves the pinion gear 9 in the axial direction together with the pinion moving body 3a via the lever 12. Further, a bearing 13 which is in sliding contact with an outer peripheral portion of the pinion moving body 3a is fitted to the first front bracket 1.

The starter 100 is mounted to the engine via a first front bracket 1 shown in fig. 2 of the front side and fig. 3 of the rear side. The first front bracket 1 is provided with a socket 1c as a mounting portion to be mounted to an engine and a plurality of engine mounting holes 1 d. A planetary reduction mechanism 4 is housed inside the second front carrier 2, and the planetary reduction mechanism 4 is held between the second front carriers 2 engaged with the intermediate plate 5. The intermediate plate 5 is fixed by being sandwiched between the yoke 6 and the second front bracket 2.

The first front bracket 1 includes a first drain groove 1a for draining water extending in the axial direction of the drive shaft 10, and a drain port 1b is provided in the axial direction on the pinion gear 9 side of the first drain groove 1 a. A drain path is formed inside the starter 100 by the first drain groove 1a and the drain port 1 b. The specifications of the socket 1c and the engine mounting hole 1d, which are mounting portions to be mounted on the engine, differ from engine to engine, and the positions and angles of the first drain tank 1a and the drain port 1b for draining provided in the first front bracket 1 also differ from engine to engine.

As shown in fig. 3, a plurality of first positioning portions 1e, which are recesses to be fitted into the second front bracket 2 and positioned, are arranged at equal intervals in the circumferential direction on the outer periphery of the first front bracket 1. On the other hand, second positioning portions 2b, which are convex portions to be fitted with the first positioning portions 1e, are arranged on the outer periphery of the second front bracket 2 shown in fig. 4 of the front surface and fig. 5 of the rear surface. Further, a plurality of drain holes 2a are provided at equal intervals between at least one pair of second positioning portions 2b adjacent to each other inside the outer periphery of the second front bracket 2, and one of the drain holes 2a communicates with the first drain groove 1a provided in the first front bracket 1 to form a drain groove 16 of the entire front bracket 15.

Thereby, the second front bracket 2 can be attached to the first front bracket 1 at a plurality of angles. Therefore, even if the range of the drain hole 2a provided in the second front bracket 2 is limited, the position of the drain hole 2a can be changed over the entire circumference.

In the example shown in fig. 4 and 5, four positioning portions 2b of the second front bracket 2 are provided at 90-degree intervals in the circumferential direction. The installation range of the drain hole 2a is set only within 90 degrees of one section thereof, but the fitting position of the second front bracket 2 can be set to rotate at four places, and therefore, the position of the drain hole 2a with respect to the starter 100 can be changed over the entire circumference. This makes it possible to set the second front bracket 2 as a common member and to eliminate the need to provide the drain holes 2a over the entire circumference, thereby preventing a reduction in the strength of the member.

In this way, the first drain groove 1a provided in the first front frame 1 and the drain hole 2a of the second front frame 2 communicate with each other, whereby the drain groove 16 of the entire front frame 15 can be formed. Further, a drain port 1b is provided toward the axial direction on the pinion gear 9 side of the drain groove 16 to form a drain path of the starter 100.

Further, the case where the first positioning portions 1e of the first front frame 1 are formed as concave portions and the second positioning portions 2b of the second front frame 2 are formed as convex portions and fitted to each other has been described, but even if the concave portions and the convex portions are exchanged, the same effect can be obtained even if the positioning is performed by a fitting method other than the concave and convex portions. Further, although the example in which the four positioning portions 2b are provided at intervals of 90 degrees has been described, it is not limited to four, and the same effect can be obtained as long as there are a plurality of positioning portions.

The intermediate plate 5 shown in fig. 6 is provided between the motor 7 and the planetary reduction mechanism 4, and engages with the second front carrier 2 to hold the planetary reduction mechanism 4. The intermediate plate 5 includes: an engaging portion 5b for positioning, the engaging portion 5b being fitted to the drainage hole 2a of the second front bracket 2; and an opening 5a, the opening 5a facing the drain hole 2a of the second front bracket 2 communicating with the first drain tank 1 a. The engaging portion 5b is bent so that a tip portion of a notch provided on the outer periphery of the intermediate plate 5 is fitted into the drainage hole 2 a.

Fig. 7 is a rear view showing the engagement of the intermediate plate 5 with the second front bracket. As shown in the drawing, the intermediate plate 5 is provided with an opening 5a at a position aligned with the drain hole 2a communicating with the first drain tank 1a, and an engaging portion 5b for positioning is provided at a position aligned with the drain hole 2a different from the drain hole 2a for aligning the opening 5 a. By using the drain hole 2a not communicating with the first drain tank 1a for engagement for positioning, there is no need to newly provide a positioning recess in the second front bracket 2, and a decrease in strength of the second front bracket 2 can be prevented. Since the intermediate plate 5 can be attached to the drain hole 2a at a plurality of positions, the opening 5a can be shared only by providing the engaging portion 5b on both sides in the circumferential direction. This enables sharing of the components of the intermediate plate 5. Further, since only a part of the outer periphery of the intermediate plate 5 is required to be cut, the strength of the member can be prevented from being lowered.

As described above, the water discharge path from the inside of the motor 7 to the inside of the first front bracket 1 is secured by the water discharge hole 2a of the second front bracket 2 and the opening portion 5a of the intermediate plate 5, and has a water discharge structure in the axial direction from the rear end to the front end of the inside of the starter 100. Since the drain holes are not provided in the radial direction of the bracket member, high waterproof performance against water wetting from below the vehicle body can be ensured, and even if water enters the motor 7, water can be drained in the axial direction from the drain hole 1b of the first front bracket 1 toward the pinion gear 9 side through the axial drain path. Further, even when the mounting angle to be mounted on the engine 1 is changed, the entire mold of the front bracket 15 does not need to be changed, and only the mold of the first divided front bracket needs to be changed. Further, the second front bracket 2 and the intermediate plate 5 can be shared in common.

While various exemplary embodiments and examples have been described in the present application, various features, modes, and functions described in one or more embodiments are not limited to the application to specific embodiments, and can be applied to the embodiments alone or in various combinations. Therefore, numerous modifications not illustrated are contemplated within the technical scope disclosed in the present specification. For example, the case where at least one component is modified, added, or omitted is included, and the case where at least one component is extracted and combined with the components of the other embodiments is also included.

Claims

1. A starter, comprising:

an electric motor as a driving force for performing engine start;

a front carrier housing a planetary reduction mechanism and a drive shaft; and

a pinion gear connected to a rotation shaft of a motor at a distal end of the driving shaft,

the front carrier is composed of a first front carrier mounted to the engine and a second front carrier housing the planetary reduction mechanism therein,

a drain groove extending in the axial direction of the drive shaft is formed in the front bracket, and a drain port is provided in the first front bracket in the axial direction from the drain groove toward the pinion gear.

2. The starter of claim 1,

a plurality of first positioning portions that are fitted into the second front bracket and positioned are arranged at equal intervals in the circumferential direction on the outer periphery of the first front bracket,

a plurality of second positioning portions that are fitted to the first positioning portions are arranged at equal intervals on the outer periphery of the second front bracket,

a first drain groove that forms a part of the drain groove extending in the axial direction of the drive shaft is provided inside the first front bracket,

and a plurality of drain holes are provided at equal intervals between at least one set of the second positioning portions adjacent to each other on the inner side of the outer periphery of the second front bracket, and one of the drain holes communicates with the first drain groove provided in the first front bracket to form the drain groove.

3. The starter of claim 2,

an intermediate plate is provided between the motor and the planetary reduction mechanism, the intermediate plate engaging with the second front carrier to hold the planetary reduction mechanism,

an opening portion is provided at a part of an outer periphery of the intermediate plate in alignment with a position of the drain hole communicated to the first drain tank, and an engaging portion for positioning with the second front bracket is provided in alignment with a position of the drain hole different from the drain hole for aligning the opening portion.