CN218805705U

CN218805705U - Small-size scraping arm structure

Info

Publication number: CN218805705U
Application number: CN202223201827.8U
Authority: CN
Inventors: 李万军
Original assignee: Anhui Shenghuabo Auto Electric Co ltd
Current assignee: Anhui Shenghuabo Auto Electric Co ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-04-07
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses an arm structure is scraped to small-size, include: scrape the arm base, with connecting piece articulated doctor-bar subassembly, set up scrape the arm base with scrape the arm subassembly between the connecting piece, it possesses the multiple spot application of force structure to scrape the arm subassembly, makes the connecting piece with doctor-bar subassembly is through scraping the arm subassembly and obtain the variation of the downforce that the control receives when compensating angle in work promotion process. Through scraping arm and torsional spring of scraping arm base internal layout hinge hole and cross slot cooperation backstop piece, platykurtic, scrape arm base integrated and scrape the hinge structure of arm and swing spacing while can also utilize the torsional spring to realize providing stable pushing down force to the doctor-bar subassembly.

Description

Small-size scraping arm structure

Technical Field

The utility model relates to a car windscreen wiper field, in particular to arm structure is scraped to small-size.

Background

Fig. 1 shows a prior art, a small wiper arm for a vehicle mostly adopts a structure that a traditional metal wiper arm is eliminated and a spring leaf is supplemented by a large plastic shell. Under this structure, the occupation space of plastic casing is great for the windscreen wiper is difficult to be accomodate in the inside gap of exterior trim.

U.S. patent publication No. US3480985a discloses a leaf spring wiper arm that includes a single, thin gauge spring steel that tapers in width from a maximum at the end of its hub to a minimum at the end of the wiper blade. Which itself is arched and shaped to complement the curvature of the vehicle windshield for use and to provide the necessary pressure for proper windshield wiping action.

German patent publication DE102012112526A1 discloses < a motor vehicle window wiper >, the wiper arm is designed as a spring rail on which a runner connected to the wiper blade can be adjusted longitudinally, and the cover is connected with the runner and can be connected to the wiper shaft in this way. The lift angle of the wiper rod can be compensated.

Both of the above-described patent disclose wiper arm arrangements that provide downward pressure to the wiper blade assembly solely through the leaf spring wiper arm to ensure that the wiper blade assembly is held against the glass surface during operation. In order to match with the design of an automobile model, most of front and rear windshields of the automobile on the market are designed into multi-curvature glass, so that the scraping blade component is adapted to the surface of the glass to generate a plurality of lifting actions in the working process, and the lifting stroke is close to 5mm-7mm. Based on the technical schemes disclosed by the two patents, the downward pressure of the scraper blade is in direct proportion to the lifting distance of the scraper blade in the working process, and the variation of the working pressure of the scraper blade is more than or equal to 50%. The working pressure fluctuation higher than 15% can cause the problems of abnormal sound, excessive abrasion and the like of the wiper component, and the service life of the wiper blade is reduced.

SUMMERY OF THE UTILITY MODEL

In order to realize the purpose, the utility model discloses the technical scheme who adopts is:

a small-sized wiper arm structure comprising: a scraping arm base, a scraping blade component hinged with the connecting piece, a scraping arm component arranged between the scraping arm base and the connecting piece,

the scraping arm assembly is provided with a multi-point force application structure, so that the connecting piece and the scraping blade assembly can obtain a compensation angle in the working lifting process through the scraping arm assembly and simultaneously control the change of the applied downward pressure.

In a preferred embodiment of the present invention, the wiper arm assembly is rigidly connected to the connecting member and is hinged to the wiper arm base, so that the connecting member and the wiper blade assembly can rotate and lift around the wiper arm base.

In a preferred embodiment of the present invention, the wiper arm assembly includes:

the scraping arm and the elastic component jointly form the multipoint force application structure;

the scraping arm has elastic performance and provides downward pressure for the connecting piece, and the elastic member provides downward pressure for the scraping arm.

In a preferred embodiment of the present invention, the elastic member has a first torsion arm, a second torsion arm and a bending portion connected to the first torsion arm and the second torsion arm to form a spring structure, and the first torsion arm connected to the scraping arm base applies a downward force to the scraping arm by using the second torsion arm under a pre-tightening force.

In a preferred embodiment of the present invention, the end of the first torque arm has a first fixed end for connecting with the wiper arm base, and the end of the second torque arm has a second fixed end for connecting with a fixed notch on the wiper arm.

In a preferred embodiment of the present invention, the wiper blade side of the wiper arm is provided with a fixing through hole for further limiting after rigid connection with the connecting member.

In a preferred embodiment of the present invention, a second connecting hole is formed in the base of the scraping arm, and the scraping arm is hinged by a rotating shaft disposed in the second connecting hole.

In a preferred embodiment of the present invention, the scraping arm base further has a cavity and a stopping portion therein, the cavity is located at one side of the second connecting hole, the cavity lower portion is provided with a stopping portion, and the scraping arm enters the cavity through an opening opened at a side of the scraping arm base and then penetrates into the second connecting hole.

In a preferred embodiment of the invention, the stop surface on the upper side of the stop and the hole top surface at the top of the opening form a limit for the maximum angle of oscillation of the wiper arm.

In a preferred embodiment of the present invention, a through hole and a groove are further respectively disposed on two side walls of the second connecting hole, and the scraping arm passes through the groove and is inserted into the through hole through the second connecting hole and the rotating shaft.

The beneficial effects of the utility model reside in that:

the utility model provides a small-size scrapes arm structure through scraping arm and torsional spring of scraping that sets up the hinge hole in scraping the arm base and wear groove cooperation backstop piece, platykurtic, can also utilize the torsional spring to realize providing stable holding down force to the doctor-bar subassembly when scraping the arm base and integrating and scraping the hinge structure and the swing of arm spacing.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a prior art schematic.

Fig. 2 is an overall schematic diagram of the present invention.

Fig. 3 is an exploded view of fig. 2.

Fig. 4 is a structural view of the wiper arm and the connecting member.

Fig. 5 is a structural view of the elastic member.

Fig. 6 is an isometric view of the wiper arm base.

Fig. 7 is a front perspective view of fig. 5.

Fig. 8 is a plan view of the present invention.

Fig. 9 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 7.

Fig. 10 is a perspective view of fig. 1.

Fig. 11 is a sectional view B-B of fig. 9.

Fig. 12 is a cross-sectional view C-C of fig. 9.

Fig. 13 is a cross-sectional view C-C of fig. 9.

Fig. 14 is a cross-sectional view C-C of fig. 9.

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and the above description is for the convenience of description of the present invention to simplify the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

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.

Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood, however, that the present application may be embodied in many different forms and is not limited to the embodiments described below. It is also to be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments. Throughout the drawings, like reference numbers indicate identical or functionally identical elements.

A small-sized wiper arm structure shown with reference to fig. 2 and 3 mainly includes: the connecting member 10, the wiper arm 20, the wiper blade assembly 30, the rotating shaft 40, the elastic member 50, and the wiper arm base 60.

Referring to fig. 4 to 7, the wiper arm 20 is an elongated leaf spring member connected between the wiper arm base 60 and the connecting member 10. The blade side 22 is formed with a fixing through hole 24, and the body side 21 is formed with a fixing notch 23. The elastic member 50 includes a first torsion arm 52 and a second torsion arm 53 extending toward the same side, and a bent portion 51 connecting the two. Elastic member 50 has a certain elastic recovery performance, and when first torsion arm 52 and/or second torsion arm 53 rotate towards the deviation from the original position, energy storage occurs at bending portion 51, so that first torsion arm 52 and/or second torsion arm 53 have a reverse recovery tendency. An end portion of the first torsion arm 52 is provided with a first fixed end 52a, and an end portion of the second torsion arm 53 is provided with a second fixed end 53a. A second connecting hole 62 is formed through the middle of the sidewall of the scraping arm base 60. The wiper arm base 60 has an opening 68 formed on a side thereof adjacent to the wiper arm 20, and a protrusion 63 protruding downward in the Z-direction is formed on a top surface 68a of the opening. A cavity 67 is formed between the second connecting hole 62 and the opening 68, a stopping part 66 is arranged at the bottom of the cavity 67, and a Z-direction limiting structure is constructed by the stopping surface 66a and the Kong Dingmian a. The through hole 65 is opened on one side of the second connecting hole 62 close to the opening 68, the groove 64 is opened on one side close to the first connecting hole 61, and the vehicle body side 21 of the wiper arm 20 is inserted into the groove 64 after passing through the opening 68, the cavity 67, the through hole 65, the second connecting hole 62 and the rotating shaft 40 positioned in the second connecting hole 62 in sequence. The rotating shaft 40 is provided with a pair of openings 41 on both sides thereof similarly to the second connecting hole 62, the scraping arm 20 is respectively inserted through the openings 41 on both sides to form a hinged connection between the scraping arm 20 and the scraping arm base 60 by placing the rotating shaft 40 in the second connecting hole 62, and the swing angle alpha of the scraping arm 20 is limited by the stop surfaces 66a and Kong Dingmian a. The side of the arm base 60 remote from the arm 20 is further provided with a first coupling hole 61 for fixing with a motor of a vehicle body.

Referring to fig. 8 to 12, after the wiper arm 20 is inserted into the wiper arm base 60, the two sides of the wiper arm have a clearance 68c with the hole side 68b of the opening 68, forming a clearance fit. The fixing of the wiper arm 20 with respect to the wiper arm base 60 is completed by the second fixing ends 53e being caught in the fixing notches 23 and the first fixing ends 52a being caught in the projections 63. The wiper blade side 22 of the wiper arm 20 is inserted into the connecting part 10 and secured in an interference fit relationship, and further locking is achieved by the securing through-holes 24 and the step in the connecting part 10.

Fig. 13 and 14 show the analysis of the present invention, and the axis of the rotating shaft 40 is defined as O, the point of application of the second torque arm 53 and the scraping arm 20 is defined as B, and the point of application of the scraping arm 20 to the scraping blade assembly 30 through the connecting member 10 is defined as a.

When the doctor blade assembly 30 is in the initial state of operation:

the elastic member 50 is assembled in place to produce a pre-deformation L1 according to the setting, which provides an elastic force value F1= L1/K1 in this pre-deformation case, K1 being the amount of deformation required for the spring to produce an elastic force of 1N. The amount of deformation l1, k1 required for the wiper arm 20 to generate an elastic force of 1N is the amount of deformation generated when the wiper arm 20 is assembled in place. The resilient member 50 provides the blade assembly 30 with a downward force F1= OB F1/OA through the wiper arm 20, and OB and OA are lengths corresponding to respective points in the drawing.

When the blade assembly 30 is lifted 5mm from service:

let x be the deformation amount of the elastic member 50, and F2 be the elastic force value thereof. The down pressure of the blade assembly 30 provided by the elastic member 50 is f2, the lift amount thereof is 5mm = y1+ y2, Y1 is the lift amount caused by the deformation of the wiper arm 20, and Y2 is the lift amount caused by the rotation of the wiper arm 20 about the point O.

In one embodiment of the present invention, K1=0.32mm/N, L1=8mm, ob =28mm, oa =176mm, and f1=4N is obtained. From F2= x 0.32, F2= F2 x 28/176, Y1=1.75 x F2, Y2/176= x/28, x =0.7mm, Y1=0.616mm, Y2=4.384mm results. f2/f1=8.75%, much less than the target value of 15%. If the traditional single-plate spring type structure is adopted in the background technology, the lifting amount of 5mm is realized by the deformation of the scraper arm 20, and the pressure variation is about 42 percent and is far larger than the existing 8.75 percent.

Claims

1. A small-sized wiper arm structure comprising: a scraping arm base, a scraping blade component hinged with the connecting piece, and a scraping arm component arranged between the scraping arm base and the connecting piece,

2. The small-sized wiper arm structure as defined in claim 1, wherein said wiper arm assembly is rigidly connected to said connecting member and is hingedly connected to said wiper arm base so that said connecting member and said wiper blade assembly are rotatably elevated about said wiper arm base.

3. A small-sized wiper arm structure as defined in claim 2, wherein said wiper arm assembly comprises:

4. The small-sized wiper arm structure according to claim 3, wherein the elastic member has a first torsion arm, a second torsion arm and a bent portion connected to the first torsion arm and the second torsion arm to form a spring structure, and the first torsion arm connected to the base of the wiper arm applies a downward force to the wiper arm by the second torsion arm under pretension.

5. The small-sized wiper arm structure as set forth in claim 4, wherein the end portion of the first torque arm has a first fixing end for coupling with the wiper arm base, and the end portion of the second torque arm has a second fixing end for coupling with the fixing notch of the wiper arm.

6. A small-sized wiper arm structure as set forth in claim 3, wherein said wiper arm is provided at a wiper blade side thereof with a fixing through-hole for further limiting after rigid connection with said connecting member.

7. The small-sized scraping arm structure as claimed in any one of claims 3 to 6, wherein a second connecting hole is formed in the scraping arm base, and the scraping arm is hinged by a rotating shaft disposed in the second connecting hole.

8. The small-sized scraping arm structure as claimed in claim 7, wherein the scraping arm base further comprises a cavity and a stopper portion, the cavity is located at one side of the second connecting hole, the stopper portion is located at a lower portion of the cavity, and the scraping arm enters the cavity through an opening formed in a side surface of the scraping arm base and then penetrates into the second connecting hole.

9. The small-sized wiper arm structure according to claim 8, wherein the stop surface on the upper side of said stopper portion and the hole top surface on the top of said opening constitute a limit of a maximum angle of swing of said wiper arm.

10. The small-sized wiper arm structure as defined in claim 7, wherein said second connecting hole has a through hole and a groove on both side walls thereof, respectively, and said wiper arm is inserted into said through hole through said groove via said second connecting hole and said rotary shaft.