US3844197A

US3844197A - Hydraulic motor and drive attachment

Info

Publication number: US3844197A
Application number: US00298594A
Authority: US
Inventors: S Kramer; E Cebular
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-10-18
Filing date: 1972-10-18
Publication date: 1974-10-29
Anticipated expiration: 1991-10-29

Abstract

A small hydraulic motor of the type for being axially advanced in an enclosure tube and comprising a tubular frame means having an inlet at one end and operatively positioning an output shaft at the other for means such as a cutting tool or root saw. The motor includes an attachment for converting longitudinal movement to arcuate movement and valve means are provided in the frame means adjacent the inlet for transmitting pressure liquid to a piston in a pressure chamber in the frame means for advancing and retraction movement of the piston, alternately, and rearwardly directed jet exhaust bores are provided in the frame means and end cap to cause the motor to advance in an enclosure tube with flow of hydraulic pressure fluid into and through the motor and angled to resist rotation of the motor itself thus twisting the hose. Two sets of jets are provided angled oppositely so that a proper twist resistance is always present, in forward and reverse portions of the cycle. This invention relates to small hydraulic motors, especially of the type that could be used in sewers and similar tubular enclosures for being progressively advanced through the sewer for clearing any obstacle provided therein, the motor is driven by pressure liquid supplied thereto through a flexible tube connecting to the inlet end of the motor and moving with the motor along in the sewer or other enclosure.

Description

United States Patent [191 Kramer et al.

[451 Oct. 29, 1974 HYDRAULIC MOTOR AND DRIVE ATTACHMENT [76] Inventors: Stanley J. Kramer, Rd. No. 3,

Geneva, Ohio 44041; Edward J. Cebular, 5721 Meister Rd., Mentor, Ohio 44060 221 Filed: Oct. 18, 1972 211 Appl. No.: 298,594

[52] US. Cl 91/52, 91/337, 91/342,

91/44 C, 92/31 [51] Int. Cl. F0ll 23/00 [58] Field of Search 91/342, 325, 337, 52; 92/31 [56] References Cited UNITED STATES PATENTS 917,917 4/1909 White 91/342 1,094,811 4/1914 Phillips et al. 91/342 2,039,570 5/1936 Thornton 91/342 2,556,680 6/1951 Davis., 91/342 2,769,912 11/1956 Lupfer et al. 91/52 3,130,644 4/1964 Schaeffer 91/342 3,205,786 9/1965 James 91/342 3,264,949 8/1966 Dietlin 92/31 3,274,899 9/1966 Stump 91/342 Primary Examiner-Paul E. Maslousky Attorney, Agent, or Firm-Oldham & Oldham Company L.P.A.

l I I30) [5 7] ABSTRACT A small hydraulic motor of the type for being axially advanced in an enclosure tube and comprising a tubular frame means having an inlet at one end and operatively positioning an output shaft at the other for means such as a cutting tool or root saw. The motor includes an attachment for converting longitudinal movement to arcuate movement and valve means are provided in the frame means adjacent the inlet for transmitting pressure liquid to a piston in a pressure chamber in the frame means for advancing and retraction movement of the piston, alternately, and rearwardly directed jet exhaust bores are provided in the frame means and end cap to cause the motor to advance in an enclosure tube with flow of hydraulic pressure fluid into and through the motor and angled to resist rotation of the motor itself thus twisting the hose. Two sets of jets are provided angled oppositely so that a proper twist resistance is always present, in forward and reverse portions of the cycle.

' This invention relates to small hydraulic motors,

especially of the type that could be used in sewers and similar tubular enclosures for being progressively advanced through the sewer for clearing any obstacle provided therein, the motor is driven by pressure liquid supplied thereto through a flexible tube connecting to the inlet end of the motor and moving with the motor along in the sewer or other enclosure.

5 Claims, 9 Drawing Figures HYDRAULIC MOTOR AND DRIVE ATTACHMENT BACKGROUND OF THE INVENTION Heretofore hydraulic motors have been provided wherein valving action in the motor is controlled by means associated with the pressure piston in the motor and where the motor includes a piston received in a pressure chamber for reciprocation therein. An auxiliary rod is provided in the bore of a tubular piston rod engaging the piston, which rod extends through a portion of the valve means and connected thereto so that it can control valving action in the motor dependent upon the piston position. Some motors of this type include those shown in US. Pat. Nos. 526,149; 1,205,857 and 1,355,208.

It is particularly desirable that motors of the type to which the present invention relates be relatively compact, but still provide an appreciable amount of driving energy both for forward movement of the motor and for forcing an output member through a drive are and then for retracting the output member for a further cutting or drive action on advancement of the motor. Also, these motors should be durable and have minimum maintenance required thereon.

The general object of the present invention is to provide a novel and improved hydraulic motor especially adapted for self-propulsion through an enclosure tube and for providing a reciprocal arcuate output from a reciprocating piston means.

Another object of the invention is to provide an improved and effective valve means in a large volume flow hydraulic motor for reversing the flow circuit of pressure liquid in the motor and for providing selfpropulsion action in the motor. I I

Other objects of the invention are to provide a more compact valve means operating on a shorter stroke than prior devices; a novel and improved control or rod engaging a valve means in a hydraulic motor and with the control rod being operatively carried within a tubular piston rod for actuation of the control valve as the piston approachesextremities of movement in the unit; to provide improved control rod operating means within the tubular piston rod; to provide detent means to aid in providing a snap action in a telescoping type 2-cup member valve means to control liquid flow in the motor; to convert axial reciprocation movement into arcuate movement effectively; to guide the movement of and accurately position a piston rod in the hydraulic motor; to provide effective propulsion forces in the motor by the hydraulic fluid received for drive of the motor; to provide a motor made from parts which are of sturdy construction and require relatively minimum maintenance thereon; to provide check valve means in the motor to aid in preventing leakage in the control valve for liquid flow into and through the motor; to provide a motor which will have a long service life; to provide a motor with improved flow control circuits for the hydraulic fluid received in and passing through the motor for drive thereof; to prevent intake of foreign matter in case of stall and restart of cycling; to provide a motor that is easy to assemble anddisassemble and has a minimum of parts; and to provide an effective durable hydraulic motor for driving a cutting tool, for example, through a sewer pipe or similar enclosure.

The foregoing and other objects-and advantages of the invention will be made more apparent as the specification proceeds.

Attention now is particularly directed to the accompanying drawings, wherein:

FIG. 1 is a longitudinal section through a hydraulic motor of the invention and output tool or cutter means operatively secured thereto;

FIG. 2 is a vertical cross sectional view taken on line 2-2 of FIG. 1;

FIG. 3 is a vertical cross section through the valve means and taken on line 33 of FIG. 1 looking in the direction indicated;

FIG. 4 is a vertical section taken on line 4-4 of FIG. 2 and looking in the direction stated;

FIG. 5 is a vertical section taken on line 5-5 through the pressure chamber of the hydraulic pump;

FIG. '6 is a horizontal section taken on line 6-6 of FIg. 1 to show the control rod and piston rod association and control means in more detail;

FIG. 7 is a fragmentary horizontal section taken on line 7-7 of FIG. 1 to show the means positioning the cutter member on the operative unit of the invention;

FIG. 8 is afragmentary vertical section showing the positioning of the cutter tool on the end of the drive mechanism; and 7 FIG. 9 is an exploded perspective view showing the relationship of the guide sleeve and spring means used in the assembly controlling the piston rod as in FIG. 6.

When referring to corresponding members shown in the drawings and referred to in the specification,corresponding numerals are used to facilitate comparison therebetween. Also, the sectional drawings provided show some members, for clarity, not directly visible at the specific section line as shown.

INVENTIVE SUBJECT MA'I'IER The hydraulic motor includes, as one embodiment of the invention, a tubular member having a plurality of axially extending bores extending thereinto from an inlet end thereof and terminating at an annular recess formed in the inner wall of the member, the member forming a pressure chamber in combination with valve means positioned at an inlet end of the chamber and a guide disc and outlet end cap operatively secured to the chamber at the opposite end thereof, a piston slidably received in the pressure chamber in the tubular member, and a tubular piston rod is secured to the piston and protrudes from the outlet end of the tubular member. An inlet valve cap is secured to the inlet end of the pressure chamber of the tubular member and valve means are received within this inlet end cap and include an axially movable closure means. The valve means enable water flow therethrough to drive the piston in one direction and when closed forcing water into the bores in the tubular member for flow to the opposite end of the pressure chamber to force the piston in the opposite direction, and rod means are slidably received in the piston rod and extends through the piston to engage a movable portion of the valve means to control its position for valve action dependent on the position of the piston in the chamber. Movement control means are associated with the rod means to aid in snapping the movable valve portion or member from one position to another and other means are present that I motor and associated means provided by the invention,

and the hydraulic motor and outlet means therefor are indicated as a whole by the numeral 10. This hydraulic motor includes a tubular member 12 for forming a pressure chamber 14, and an inlet end cap 16 is operatively secured to what is termed the inlet end of the hydraulic motor and which end cap is secured to an end of the tubular member 12, 'Valve means indicated as a whole by the numeral 18 are provided within the inlet end cap 16 and operatively engage-the inlet end of the tubular member 12 tofon'n one end of the pressure chamber 14, while a piston 20 is'slidably received in the pressure chamber 14 for reciprocation along the axisof the tubular member."

A guide means or disc 22 is operatively positioned at the other end of the tubular member 12 to form an additional closure for the outlet end of the pressure chamber 14.

So as toconvert axial reciprocating movement from the piston 20 into arc'uate movement, a movement converting means 30 is operatively attached to the outlet end of the tubular member 12 and some suitable outlet tool assembly such as indicated at 32 is operatively attached to the free end ofv the movement conversion means or-unit 30. Y

A tubular piston rod 24is secured to the piston and extends therefrom toward the outlet end of the pressure chamber 14, while a control rod 26 is slidably received within the bore of the piston rod and it connects to 'a movable member in the valve means 18 for controlling the setting in the valve means dependent upon the axial position of the piston in the pressure chamber 14, as hereinafter described.

VALVE MEANS AND ASSOCIATED MECHANISM pressure chamber, as hereinafter described, and they terminate at and connect to a recess 41 formed in and extending circumferentially of the inner wall of the member.

The valve means 18, as one of the components thereof. includes a substantially cup-shaped member 42 which is fixedly secured in position between an inner surface of the inlet end cap 16 and the inlet end of the tubular member 12. A plurality of circumferentially spaced, axial bores 44 are provided in the wall of this cup member 42 and are positioned in alignment with the bores 40 in the tubular member to transmit pressure liquid thereto as hereinafter described. Inlet ends of these bores 44 are in communication with the interior surface of the cup member 42. In the base 43 of the cup member 42, a plurality of circumferentially spaced bores or holes 46 are provided, as best indicated in FIG. 4. A second substantially cup-shaped member 48 is slidably received within the first cup member 42 for limited telescopic movement therein on the axis of the motor. This second cup member has a plurality of circumferentially spaced openings 50 in a base portion thereof and extending up into the wall 47 of the cup. Such openings 50 are larger than the holes 46 and are circumferentially. offset with relation thereto whereby there is no axial overlapping of the holes 46 in the base of the first cup member in relation to these openings 50 to provide for valve closure action when the cup members arefully nested together, making possible large volume action with a very short stroke.

FIG. 1 shows the second cup member 48 with its open end abutted against the inner end of the inlet end cap 16. This is one extremity of movement of such second cup member when the valve means is open and liquid forced into the motor through the opening in the inlet end cap flows through the openings 50 in the second cup member and then through the holes 46 in the first cup member .to flow into the pressure chamber 14 to actuate the piston and cause it to move through a pressure or advancestroke. As the openings 50 extend slightly up into the axially extending wall Men the inner surface thereof, this aids in free fluid flow therethrough.

Guide pins 54 aresecured to the base 43 of the first cup member and protrude towards the inlet of the motor, being received in corresponding circumferentially spaced bores or holes 56 providedin the base of the second cup member 48 to aid in maintaining the cup members in proper circumferential relationship with each other to provide for valving action between the holes formed in the cup bases. Thus, when the second cup member is moved axially of the first cup member into full engagement therewith, then no appreciable flow of pressure liquid through the valve means is permitted so that a valve closed" action is provided in the motor.

It will be realized that any suitable source of hydraulic fluid under pressure, such asa flexible pressure hose or line, will connect to the inlet end cap 16 for continuously supplying pressure liquid thereto even as the hydraulic motor 10 moves axially through an enclosure, such as a sewer pipe. Likewise, the motor can be retracted from the sewer by the flexible pressure line connecting thereto.

In the position of the second cup member 48 shown in FIG. 1, flow of pressure liquid to the relatively large bores 44 in the side walls of the cup member 42 and to the bores 40 in the tubular member is prevented. However, when the second cup member is moved axially inwardly to its closed position, at that time then pressure liquid will flow into and through the bores 44 for flow to the relatively large bores 40 the tubular member and for flow therefrom through the annular recess 41 provided in the inner wall of the tubular member 12 adjacent the outletor exhaust end thereof for retractive movement of the piston on a pressure stroke in a direction to the left, as shown in FIG. 1 of the drawings.

'A plurality of circumferentially spaced rearwardly directed exhaust jets or ports 60 are provided in the tinbular member 12 and they connect to the recess 41. Hence, on movement of the piston in a right-hand direction as shown in FIG. I, then pressure liquid trapped within the pressure chamber will flow out through the recess 41 and some liquid will escape through the jets 60 to provide an axial propulsion movement for the hydraulic motor. Pressure liquid also is present in the bores 40 in the tubular member and these bores operatively connect to liquid exhaust ports 62 or reduced diameter provided in the inlet end cap. Preferably this back pressure set up by a power stroke of the piston to the right in the hydraulic motor also preferably provides back-up pressure on a plurality of detents 64. These detents 64, FIG. 2, are provided in a plurality of radially extending holes 66 formed in the wall of the cup member 42 in equally circumferentially spaced relation to each other. The detents each carry an 0-ring 68 between a pair of axially spaced ribs thereon and with such ringsbeing adapted to seal the detents in the holes 66 for slidable movement therein. The pressure liquid reaches the radially'outer portions of the holes 66 by connecting bores 70 to aid in retaining these detents in an axially or radially inwardly protruding position. The inner ends of the detents are adapted to engage with either of two parallel circumferentially extending grooves 72 and 74 formed in axially spaced portions of the outer surface of the wall of the second cup member 48 dependent upon whether the second cup member is in a valve closed or a valve open position, respectively. The detents retain the cup member 48 in such position until suitable forces are exerted on the second cup member to move it from one valving position to another as controlled by motor operation and the desired accompanying valve action to provide change in the direction of stroke or movement of the piston in the motor.

An additional feature of the valve means 18 provided in the apparatus is a check valve plate 80 that is operatively associated with and carried by the base of the first cup member 42. This check plate or disc 80 is on the exhaust or downstream face of the base 43 of this cup member 42 and is resiliently urged thereagainst as by a plurality of coil springs 82 that are individually carried by a plurality of circumferentially spaced cap screws 84. These screws engage the base of the cup member with the spring being compressed against this check disc 80 to retain the valve in its closed condition when the piston is being moved to the left as the motor is shown in FIG. I of the drawings. However, when the valve is open, liquid readily unseats the valve plate from the cup member 42 and pressure liquid flows into the pressure chamber through a center aperture 90 in the plate, and the valve plate becomes a back-up system to prevent malfunction under widely varying loads.

VALVE CONTROL MEANS The valve control means in the motor of the invention are shown to include a stop collar 92 that is secured as by pin 94 to the control rod 24 adjacent the downstream or outlet end of the motor. Coil springs 96 and 98 are in telescopic engagmenet with the piston rod 24 and will abut on opposite ends of this collar 92.

Motion producing sleeves

100 and 102 individually engage ends of the coil springs 96 and 98, respectively, remote from the collar 92. These sleeves receive the control rod 26 in their bores and at least the coil spring 96 and sleeve 100 are in permanent engagement with the control rod.

As previously indicated, the valve means 18 is moved from its open position as shown in FIG. 1 to a closed position wherein the second cup member 48 is moved axially inwardly to seat on the base of the cup member 42 when the piston 20 approaches the end of its power stroke moving to the right in the tubular member 12. At that time, a guide sleeve or collar 104 which is in threaded engagement with a tapped end of a bore provided in the piston, as indicated at 106, has moved to the right with the piston and contacts the adjacent end of the sleeve to force it toward the collar 92. Hence, this action initially compresses the coil spring 96 and ultimately sufficient axial movement of the control rod 24 causes the sleeve 100 to abut against the collar 92. Then slight additional movement of the piston causes the second cup member 48 to snap from the open position shown in FIG. 1 to a closed position. The detents 64 that are seated in the groove 74 in the second cup member in its axially outer position are released and they engage the second groove 72 in the periphery of the cup members 48 when the valve has been moved to its closed position. Such valve closing action also immediately opens the bores 40 in the tubular member through the axially aligned bores 44 in the cup member 42 to clear them for flow of the inlet pressure liquid thereto. The final movement of the piston 20 to the right has also compressed the coil spring 98 by the collar 92 forcing such spring into its positioning sleeve 102. Such sleeve 102 abuts against associated means used in providing output from the motor 10 of the invention, as herein after described, in the valve closed position.

As the piston 20 initially moves to the right in the pressure chamber 14, it exposes the plurality of circumferentially spaced bores 70 formed in the tubular member 12. These bores 70 extend radially from the pressure chamber and then axially to connect to bores 109 in the wall of the first cup-shaped member 42 to connect to the detent receiving holes 66. Hence, on a power stroke to the right, pressure liquid flows through these

bores

70 and 109 to the axially outer ends of the detents 64. Such pressure transmission to the detents aids in retaining them in locked operative engagement with the recess 74 in the second cup member 48 when at its innermost position. Some pressure liquid exhausts through the axially directed, circumferentially inclined small diameter bores 62 to propel the motor 10 forwardly. Also, pressure liquid in the chamber 14 flows to the holes 66 for exhaust through bores 62 when the piston moves to the left in the chamber.

As the piston 20 is moved to the left in the pressure chamber and approaches the position shown in FIG. 1, then the piston'20 will serve to seal or close off the inlet ends of these bores 108 and remove the backing pressure from the locking detents 64. At that time, then the spring 98, having been compressed by previous movement of the piston and associated means then will act to snap the second cup member 48 from its previous valve closing position to the position shown in FIG. 1 and the valve open position.

MOTOR OUTPUT AND MOTION TRANSLATING MEANS An outlet cap 110 is secured to the right-hand end of the tubular member 12 as shown in the drawings, and such member is in threaded and removable engagement with the tubular member. The end cap 110 rotatably engages a flange 112 provided at an end of a tubular member 114 which extends axially from the end cap 110 and motor for output transmission purposes. This tube 114 has a pair of diametrically opposed helically shaped slots 116 formed therein. Such slots receive or engage the ends of the tubular piston rod 24 as by an end set screw 119 so that the pin, by reciprocation of the piston causes the tube 114 to move through an arc of 180 with each stroke of the piston in either direction. This pin 118 has the sleeve 102 butted thereagainst for the valve control action as described heretofore. Also a closure sleeve or tube 120 is secured over the tube 114 and is retained in place by any suitable means such as a seal or gasket ring 122 operatively positioned between an overhanging flange 124 on the outlet end cap and the periphery of the sleeve 120 to keep out dirt from this part of the motor.

The end cap 110 also retains the guide means 22 in position by engaging an end flange 23 thereon to retain it against an end of the tubular member 12.

Guide pins 111 carried by the tubular member 12 extend therefrom to seat in bores 113 in the guide means 22 to position such members in desired axial alignment.

Any suitable tool mounting means is secured to the end of the tube 114 for action such as cutting roots or obstructions that are present in any confining tube or pipe in which the motor is positioned. Thus a suitable plug type connector member or coupling means of any type, indicated by the numeral 130, is operatively engaged with and/or suitably secured to the exposed end of the tube 114. Such connector or coupling means is shown as including a carrier device 132 which may be removably secured to the connector 130 as by a lock pin 134 urged into. its operative position engaging device. 132 and securing it to the connector 130 by a coil spring 136. Such a device 132 has a member such as a cutting head or tool 140 with a T shaped shank 141 secured to the end-thereof and in axial alignment with the hydraulic motor. Such shank 141 can be inserted through an elongated slot 142 in the end of the device 132 and then be twisted to be engaged therewith. The cutting head 140 is of any known construction and is operatively secured to the device 132 in any conventional manner. The cutting head 140 has known types of cutter blades, tools or similar means thereon. It is secured in place by a bayonet type joint as described or by any suitable connection means.

Hence operative movement of the hydraulic motor 10 will move the cutting tool 140 axially with axial movement of the hydraulic motor and the cutting tool is moved back and forth through arcs of 180 depending upon whether the piston is being given an advance stroke or a retraction stroke. Sufflcientpower is exerted on the tool to give it a repetitive cutting action on any obstacles encountered,

Any liquid received in the radially inner ends of the detent bores 64 as by blow-by due to valve wear will exhaust therefrom through bores 65 formed in the wall of the first cup member 42 and connecting to bores 16a in the inlet end cap 16.

Suitable sealing rings and guide keys are provided in portions of the motor. 10 as required. A large volume of liquid will flow through the motor and a short stroke piston is obtained.

H0. 5 shows that the exhaust jets 60 are inclined to the motor radius to oppose twisting of the water pressure supply hose.

An improved hydraulic motor for sewer cleaning and similar action is provided. The motor is effective in service and has a good poweroutput. Hence, the objects of the invention have been achieved.

While one complete embodiment of the invention has been disclosed herein, it will be appreciated that modification of this particular embodiment of the invention may be resorted to without departing from the scope of the invention.

What is claimed is: g

1. A hydraulic motor comprising a tubular member having an inlet end and a center bore and having a plurality of axially extending bores extending into the wall of the tubular member from an inlet end thereof and terminating in communication with the center bore of the member, such member forming a pressure chamber,

a piston slidably received in said tubular member,

a tubular piston rod secured to said piston and protruding from the other end of the tubular member,

an inlet end cap secured to the inlet end of said tubular. member,

valve means including an axially movable closure means received in said end cap and forming a closure for the inlet end of said pressure chamber, said valve means when open enabling water flow therethrough to drive said piston in one direction and when closed forcing water into said bores in said tubular member for flow to said chamber to force said piston in the opposite direction,

rod means slidably received in said piston rod and extending through said piston to engage said closure means to control its position and the action of said valve means dependent on the position of said piston in said chamber;

said valve means including an inner cup member, an outer cup member slidably receiving said inner cup member, said rod means engaging said inner cup member, and detents engaging said inner cup member to retain it in a valve open or a valve closed position; and

a check valve plate operatively engaging the downstream face of said outer cup member, and spring means engaging said check valve plate to urge it into engagement with said outer cup member for valve closing action.

2. A hydraulic motor as in claim 1 where bore means connect an inlet section of said pressure chamber to radially outer portions of said detents to provide inner cup member retentive pressure thereon.

3. A hydraulic motor as in claim 1 and including an outlet end cap secured to said other end of said tubular member, a guide disc means secured within the motor and extending across the chamber to close the outlet end thereof, said disc means slidably engaging said piston rod, a tubular means rotatably engaged and positioned by said outlet end cap, a tool means operatively carried by said tubular means, and meansconnecting said tubular means to said piston rod for axial and rotary drive thereby. I

4. A hydraulic motor as in claim 1 wherein said outer cup member abuts on the inlet end of said tubular member and has a wall with axially extending bores 5. A hydraulic motor as in claim 4 where said rod means has a collar fixed thereto adjacent its end remote from said valve means, a spring is in telescopic engagement with said rod means at each end of said collar, and sleeve means individually operatively engage the opposite ends of said springs to compress one of said springs as said piston approaches an end of its movement to aid in moving said second cup member from one valving position to another.

Claims

1. A hydraulic motor comprising a tubular member having an inlet end and a center bore and having a plurality of axially extending bores extending into the wall of the tubular member from an inlet end thereof and terminating in communication with the center bore of the member, such member forming a pressure chamber, a piston slidably received in said tubular member, a tubular piston rod secured to said piston and protruding from the other end of the tubular member, an inlet end cap secured to the inlet end of said tubular member, valve means including an axially movable closure means received in said end cap and forming a closure for the inlet end of said pressure chamber, said valve means when open enabling water flow therethrough to drive said piston in one direction and when closed forcing water into said bores in said tubular member for flow to said chamber to force said piston in the opposite direction, rod means slidably received in said piston rod and extending through said piston to engage said closure means to control its position and the action of said valve means dependent on the position of said piston in said chamber; said valve means including an inner cup member, an outer cup member slidably receiving said inner cup member, said rod means engaging said inner cup member, and detents engaging said inner cup member to retain it in a valve open or a valve closed position; and a check valve plate operatively engaging the downstream face of said outer cup member, and spring means engaging said check valve plate to urge it into engagement with said outer cup member for valve closing action.

3. A hydraulic motor as in claim 1 and including an outlet end cap secured to said other end of saId tubular member, a guide disc means secured within the motor and extending across the chamber to close the outlet end thereof, said disc means slidably engaging said piston rod, a tubular means rotatably engaged and positioned by said outlet end cap, a tool means operatively carried by said tubular means, and means connecting said tubular means to said piston rod for axial and rotary drive thereby.

4. A hydraulic motor as in claim 1 wherein said outer cup member abuts on the inlet end of said tubular member and has a wall with axially extending bores connecting to the wall bores in said tubular member, said outer cup member having valve bores in a base portion thereof, said inner cup member having circumferentially spaced valve bores in a base portion thereof and having valve open and valve closed positions, said valve bores in said inner and outer cup members being circumferentially offset from each other, said detents being carried by said outer cup member to engage said inner cup member and resiliently retain it in valve open or closed position, said detents being positioned for movement radially of said cup members.

5. A hydraulic motor as in claim 4 where said rod means has a collar fixed thereto adjacent its end remote from said valve means, a spring is in telescopic engagement with said rod means at each end of said collar, and sleeve means individually operatively engage the opposite ends of said springs to compress one of said springs as said piston approaches an end of its movement to aid in moving said second cup member from one valving position to another.