Patent Publication Number: US-2013247705-A1

Title: Shifting apparatus for manual transmission

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Korean Patent Application No. 10-2012-0030786 filed on Mar. 26, 2012, the entire contents of which is incorporated herein for all purposes by this reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a shifting apparatus for a manual transmission. More particularly, the present invention relates to a shifting apparatus for a manual transmission that may prevent from deteriorating of shift feel due to clearance (or gap) of shifting by supporting a control body rotated by a control shaft after shifting. 
     2. Description of Related Art 
     In general, a transmission for converting a motive power of an engine to an appropriate driving power is installed in a vehicle and a shifting apparatus for operating the transmission is installed in the vehicle. 
     The shifting apparatus applied to the manual transmission, which transmits an operating force of the shifting lever to the manual transmission to achieve a shift, is constituted by a selecting cable and a shifting cable transmitting the operating force by the shifting operation of the shifting lever, a control shaft assembly connected with the selecting and shifting cables, and a shift fork assembly mounted between the control shaft assembly and a synchronizing device of the transmission to perform shifting by operating the synchronizing device according to operating of the control shaft assembly. 
     When a driver manipulates a shift lever, a shift lever and a select lever connected to a control cable are operated. And then a control shaft rotates and/or moves axial direction so that the control shaft assembly is operated. 
     The control shaft assembly operates a shift rail and a shift fork applying shifting force to the synchronizing devices disposed corresponding to each shift ranges, and thus driving torque of an engine is appropriately applied for each running state of a vehicle. 
     However, in a conventional art, the shifting apparatus may have clearance (or gap) of shifting (or mechanical clearance) due to clearances between a shift finger and a rug and between a fork and a sleeve. So after rotation of the control shaft, the control shaft may move along rotating direction and thus shift feel may be deteriorated. 
     It may be considered to mount a separated stopper for supporting against rotation direction of the control shaft, however, layout within the transmission may be complicated and manufacturing cost may be increased due to increasing of constituent elements. 
     The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. 
     BRIEF SUMMARY 
     Various aspects of the present invention are directed to providing a shifting apparatus for a manual transmission having advantages of preventing deterioration of shift feel due to rotation of a control shaft according to clearance of shifting or mechanical clearance by forming a stopper to a control housing for supporting a control body rotating with the control shaft in shift manipulation. Also, an exemplary embodiment of the present invention provides a shifting apparatus for a manual transmission which may simplify layout and constitutional elements and reduce manufacturing cost. 
     In an aspect of the present invention, a shifting apparatus for a manual transmission which transmits shifting operations of a shift lever to the transmission and may include a control shaft rotatably and movably mounted to a control housing, may include a control body which is mounted to the control shaft and is rotated with the control shaft or moved along an axial direction of the control shaft with the control shaft according to selecting operating or shifting operation, wherein a shift groove and a select groove are formed to one side and the other side of the control body, and a stopper protruded on an inward side of the control housing corresponding to the control body for supporting the rotated control body along circumferential direction thereof. 
     Support protrusions are extendedly formed at both edges of the one side of the control body where the shift groove is formed. 
     Support portions are formed at the stopper, and each of the support protrusions selectively contacts a corresponding support portion of the support portions. 
     Each of the support portions is a slanted surface inclined toward the control body. 
     The stopper is a pair corresponding to each support protrusion. 
     The shifting apparatus may further include detent units mounted to the stopper, wherein the shift groove and the select groove contact a corresponding detent unit of the dent units respectively in the shifting operation. 
     Each of the dent units is disposed between the support portions and is substantially symmetrically-disposed with respect to both of the support portions. 
     According to an exemplary embodiment of the present invention, the shifting apparatus for a manual transmission may prevent deterioration of shift feel due to rotation of a control shaft according to clearance of shifting or mechanical clearance by forming a stopper to a control housing for supporting a control body rotating with the control shaft in shift manipulation. 
     Also, the shifting apparatus for a manual transmission may simplify layout and constitutional elements and reduce manufacturing cost without separated units for preventing rotation. 
     The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention. 
         FIG. 2  is a enlarged view of A of  FIG. 1 . 
         FIG. 3  is a perspective view of a control body applied to a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention. 
         FIG. 4  is a view showing operations of a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention. 
     
    
    
     It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. 
     In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that the present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims. 
     An exemplary embodiment of the present invention will hereinafter be described in detail with reference to the accompanying drawings. 
     Exemplary embodiments described in the present specification and a configuration shown in the drawings are just the most preferable exemplary embodiment of the present invention, but are not limited to the spirit and scope of the present invention. Therefore, it should be understood that there may be various equivalents and modifications capable of replacing them at the time of filing of the present application. 
       FIG. 1  is a perspective view of a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention, and  FIG. 2  is a enlarged view of A of  FIG. 1 .  FIG. 3  is a perspective view of a control body applied to a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention, and  FIG. 4  is a view showing operations of a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention. 
     A shifting apparatus  1  for a manual transmission according to an exemplary embodiment of the present invention, as shown in  FIG. 1 , includes a control shaft  10 , for transmitting shift force or shift operation of a non-illustrated shift lever to a transmission, which is rotatably and movably mounted to a control housing  12 . 
     When the control shaft  10  rotates and/or reciprocates in a straight line, the control shaft  10  operates a shift rail  14  which transmitting shifting force to a synchronizing device including a shift lug  16  and a fork  18  disposed to each shift ranges and thus shifting operation is executed. 
     The shifting apparatus  1  according to an exemplary embodiment of the present invention further includes, as shown in  FIG. 2  and  FIG. 3 , a control body  20  and a stopper  30  and detailed description will be followed. 
     The control body  20  is mounted to the control shaft  10  and selectively rotates and/or moves axial direction together with the control shaft  10  according to select operations and shift operation, and a shift groove  24  and a select groove  26  are formed to one and the other side of the control body  20 . 
     In the control body  20 , a mounting hole  22  for the control shaft  10  to be inserted thereinto and mounted thereto is formed to the control body  20 , support protrusions  28  are extendedly formed at both edges of the one side of the control body  20  where the shift groove  24  is formed. 
     The support protrusions  28  are extended outwardly respectively from the upper portion of the shift groove  24 . 
     The control body  20  mounted to the control shaft  10  through the mounting hole  22  is disposed adjacent to the control housing  12 . 
     The stopper  30  is integrally protruded on the inward side of the control housing  12  corresponding to the control body  20  for selectively supporting the rotated control body  20  along circumferential direction thereof. 
     The stopper  30  is protruded toward the control body  20 , and covers the control body  20  rotatable within the stopper  30 . 
     The stopper  30  may be formed as a pair corresponding to each support protrusion  28  formed to the control body  20  and a support portion  32  may be formed integrally corresponding to each support protrusion  28 . 
     In the present exemplary embodiment, the support portion  32  may be a slanted surface which is slantly formed for stably supporting the rotated control body  20  by contacting the support protrusion  28  of the control body  20 . 
     In the present exemplary embodiment, the shift groove  24  and the select groove  26  may contact detent units  40  respectively which are mounted to the stopper  30 . 
     Hereinafter, operations of the shifting apparatus  1  for a manual transmission according to an exemplary embodiment of the present invention will be discussed. 
       FIG. 4  is a view showing operations of a shifting apparatus for a manual transmission according to an exemplary embodiment of the present invention. 
     The control shaft  10  of the shifting apparatus  1  rotates in shifting operation when a driver manipulates a shift lever, and simultaneously the control body  20  rotates together with the control shaft  10 . 
     The support protrusions  28  rotated with the control body  20 , as shown in  FIG. 4 , contact the support portion  32  formed as slanted surfaces insides of the stopper  30 , so that the support protrusions  28  are stably supported. 
     That is, after rotation of the control shaft  10 , the support portion  32  of the stopper  30  prevents the control body  20  from being rotated further. Thus the control body  20  may not be excessively rotated even though there is clearance of shifting or mechanical clearance between a shift finger and the shift rug  16  and between the shift fork  18  and a sleeve. 
     Thus, the shifting apparatus  1  for a manual transmission an exemplary embodiment of the present invention may prevent deterioration of shift feel due to rotation of the control shaft  01  according to clearance of shifting or mechanical clearance by disposing the stopper  30  provided with the support portion  32  for supporting the control body  20  rotating with the control shaft  10  in shift manipulation. 
     Also, the shifting apparatus  1  for a manual transmission an exemplary embodiment of the present invention may simplify layout and constitutional elements and reduce manufacturing cost without separated units for preventing rotation. 
     The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.